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LTC3589 / LTC3589-1 / LTC3589-2 - 具有排序和 I2C 控制功能的 8 路输出稳压器
三路、I2C 可调型、高效率、降压型 DC/DC 转换器：1.6A、1A/1.2A、1A/1.2A
高效率、1.2A 降压-升压型 DC/DC 转换器
三路、250mA LDO 稳压器
具有系统复位功能的按钮 ON/OFF 控制
灵活的引脚搭接排序操作
I2C 和独立的使能控制引脚
电源良好和复位输出
动态电压调节和转换速率控制
可选择的 2.25MHz 或 1.12MHz 开关频率
始终保持运行的 25mA LDO 稳压器
8&A 待机电流
40 引脚 6mm x 6mm x 0.75mm QFN 封装
LTC&3589 是完整的电源管理解决方案，适合于 ARM 和基于 ARM 的处理器、以及高级便携式微处理器系统。该器件包含三个用于内核、存储器和 SoC 电源轨的降压型 DC/DC 转换器、一个用于 I/O (在 1.8V 至 5V) 的降压-升压型稳压器、和三个用于低噪声模拟电源的 250mA LDO 稳压器。一个 I2C 串行端口用于控制稳压器使能、输出电压电平、动态电压调节、操作模式和状态报告。表 1 中概要罗列了 LTC3589、 LTC3589-1 和 LTC3589-2 之间的差异。
稳压器启动的排序操作通过按期望的次序将其输出连接至使能引脚或通过 I2C 端口来完成。系统上电、断电和复位功能受控于按钮接口、引脚输入或 I2C 接口。
LTC3589 支持 i.MAX53/51、PXA 和 OMAP 处理器，具有 8 个处于合适功率级的独立电源轨。其他特点包括接口信号，例如：其电平同时在 4 个电源轨上的编程运行与待机输出电压之间变换的 VSTB 引脚。该器件采用具有裸露衬垫的扁平 40 引脚 6mm x 6mm QFN 封装。
手持式仪器和扫描仪
便携式工业设备
汽车信息娱乐
高端消费类设备
多电源轨系统
支持 Freescale i.MAX53/51、Marvell PXA 和其他的应用处理器
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Linduino 是凌力尔特的 Arduino 兼容型系统，适用于开发和分发针对凌力尔特集成电路的固件库和代码范例。下面的代码程序可以下载或者“拷贝并粘贴”到您的设计方案之中。请访问 以获取演示板、手册和设置信息。
该器件得到了代码支持： 提供了可用于该器件的代码示例。下面的代码有可能依存于中提供的其他驱动程序。
Linear Technology DC1558 and DC1808 Demonstration Boards.
LTC3589: 8-Output Regulator with Sequencing and I2C
Set the terminal baud rate to 115200 and select the newline terminator.
Set all switches in SW1 to their default position.
Tie PWR_ON high by connecting it to VIN.
Power VIN from an external power supply.
For proper IRQ LED behavior, move resistor R39 to the optional R38 position
on the DC2026B.
@endverbatim
/product/LTC3589
/product/LTC3589#demoboards
REVISION HISTORY
$Revision: 5045 $
Copyright (c) 2013, Linear Technology Corp.(LTC)
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS &AS IS& AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
The views and conclusions contained in the software and documentation are those
of the authors and should not be interpreted as representing official policies,
either expressed or implied, of Linear Technology Corp.
The Linear Technology Linduino is not affiliated with the official Arduino team.
However, the Linduino is only possible because of the Arduino team's commitment
to the open-source community.
Please, visit http://www.arduino.cc and
http://store.arduino.cc , and consider a purchase that will help fund their
ongoing work.
@ingroup LTC3589
#include &Arduino.h&
#include &stdint.h&
#include &Linduino.h&
#include &UserInterface.h&
#include &LT_I2C.h&
#include &QuikEval_EEPROM.h&
#include &LTC3589.h&
// Global variables
static uint8_t demo_board_
//!& Set to 1 if the board is connected
static uint8_t i2c_
//!& I2C address set for all LTC3589 options
static char board_
//!& Demo board option of the attached demo board
char demo_name_1[] = &DC1558&;
//!& Demo Board Name stored in QuikEval EEPROM
char demo_name_2[] = &DC1808&;
//!& Demo Board Name stored in QuikEval EEPROM
uint8_t reg_phase[7] = {1,1,1,1,1,1,1};
//!& Power-up sequence phases for every regulator output
float delay_ms = 0;
//!& Delay between power-up phases
uint8_t reg_read_list[15] = {0x07,0x010,0x12,0x20,0x23,0x24,0x25,0x26,0x27,0x29,0x2A,0x32,0x33,0x02,0x13};
uint8_t reg_write_list[14] = {0x07,0x010,0x12,0x20,0x21,0x23,0x24,0x25,0x26,0x27,0x29,0x2A,0x32,0x33};
void setup()
Setup the program
quikeval_I2C_init();
//! Initializes Linduino I2C port.
quikeval_I2C_connect();
//! Connects I2C port to the QuikEval connector
Serial.begin(115200);
//! Initialize the serial port to the PC
print_title();
demo_board_connected = discover_demo_boards(demo_name_1, demo_name_2);
//! Checks if correct demo board is connected.
if (demo_board_connected)
i2c_address = LTC3589_I2C_ADDRESS;
print_prompt();
print_warning_prompt();
demo_board_connected =
i2c_address = LTC3589_I2C_ADDRESS;
//! Repeats Linduino loop
void loop()
int8_t ack=0;
uint8_t user_
if (demo_board_connected)
//! Does nothing if the demo board is not connected
if (Serial.available())
//! Checks for user input
user_command = read_int();
//! Reads the user command
if (user_command != 'm')
Serial.println(user_command);
switch (user_command)
//! Prints the appropriate submenu
ack |= menu_1_read_write_registers();
// Print single-ended voltage menu
ack |= menu_2_regulator_settings();
// Differential voltage menu
ack |= menu_3_sequencing(reg_phase);
// Sequencing menu
Serial.println(&Incorrect Option&);
if (ack != 0)
Serial.print(F(&Error: No Acknowledge. \n&));
print_prompt();
// Function Definitions
//! Prints the Read/Write Registers menu and handles the user response.
//! @return State of the acknowledge bit after menu selection. 0=valid selection, 1=invalid selection.
int8_t menu_1_read_write_registers()
int8_t ack=0;
uint8_t user_
uint8_t user_
uint8_t user_
//! Displays the Read/Write Registers menu
Serial.print(F(&\nRead/Write Registers\n\n&));
Serial.print(F(&
1-Read All Registers\n&));
Serial.print(F(&
2-Read Single Register\n&));
Serial.print(F(&
3-Write Single Register\n&));
Serial.print(F(&
4-Set Bit\n&));
Serial.print(F(&
5-Clear Bit\n&));
Serial.print(F(&
6-Clear IRQ\n&));
Serial.print(F(&
m-Main Menu\n&));
Serial.print(F(&\nEnter a command: &));
user_command = read_int();
//! Reads the user command
if (user_command == 'm')
// Print m if it is entered
Serial.print(F(&m\n&));
Serial.println(user_command);
// Print user command
//! Reads or writes to a LTC3589 and prints result.
switch (user_command)
// Read every register and print it's data.
ack |= LTC3589_print_all_registers(i2c_address);
// Read a single register and print it's data.
Serial.print(F(&\nAddress (in hex with '0x' prefix) of register to read: &));
user_register = read_int();
Serial.print(&0x&);
Serial.println(user_register, HEX);
if (!valid_register(user_register, reg_read_list, sizeof(reg_read_list)))
Serial.println(F(&
Invalid input.&));
ack |= LTC3589_register_read(i2c_address, user_register, &data);
Serial.print(&Register data: 0x&);
Serial.println(data, HEX);
// Write a byte to a chosen register.
Serial.print(F(&\nAddress (in hex with '0x' prefix) of register to write: &));
user_register = read_int();
Serial.print(&0x&);
Serial.println(user_register, HEX);
if (user_register == 0x21)
Serial.println(F(&
Clear IRQ command sent.&));
ack |= LTC3589_register_write(i2c_address, user_register, 0x01);
else if (!valid_register(user_register, reg_write_list, sizeof(reg_write_list)))
Serial.println(F(&
Invalid input.&));
Serial.print(F(&Data (in hex with '0x' prefix) to write: &));
data = read_int();
Serial.println(data, HEX);
ack |= LTC3589_register_write(i2c_address, user_register, data);
Serial.print(&0x&);
Serial.print(data, HEX);
Serial.print(& written to register 0x&);
Serial.println(user_register, HEX);
// Set a single bit within a chosen register.
Serial.print(F(&\nAddress (in hex with '0x' prefix) of register: &));
user_register = read_int();
Serial.print(&0x&);
Serial.println(user_register, HEX);
if (!valid_register(user_register, reg_write_list, sizeof(reg_write_list)))
Serial.println(F(&
Invalid input.&));
Serial.print(F(&Bit position (0-7) to set: &));
data = read_int();
if (data & 0 || data & 7)
Serial.println(F(&
Invalid input.&));
Serial.println(data, DEC);
ack |= LTC3589_bit_set(i2c_address, user_register, data);
Serial.print(&Bit set. Register data is now 0x&);
ack |= LTC3589_register_read(i2c_address, user_register, &data);
Serial.println(data, HEX);
// Clear a single bit within a chosen register.
Serial.print(F(&\nAddress (in hex with '0x' prefix) of register: &));
user_register = read_int();
Serial.print(&0x&);
Serial.println(user_register, HEX);
if (!valid_register(user_register, reg_write_list, sizeof(reg_write_list)))
Serial.println(F(&
Invalid input.&));
Serial.print(F(&Bit position (0-7) to clear: &));
data = read_int();
if (data & 0 || data & 7)
Serial.println(F(&Invalid input.&));
Serial.println(data, DEC);
ack |= LTC3589_bit_clear(i2c_address, user_register, data);
Serial.print(&Bit cleared. Register data is now 0x&);
ack |= LTC3589_register_read(i2c_address, user_register, &data);
Serial.println(data, HEX);
// Clear IRQ register
Serial.println(F(&\n
Clear IRQ command sent.&));
ack |= LTC3589_register_write(i2c_address, LTC3589_REG_CLIRQ, 0x01);
if (user_command != 'm')
Serial.println(&Invalid Selection&);
while ((user_command != 'm') && (ack != 1));
return(ack);
//! Prints the Regulator Settings menu and handles the user response.
//! @return State of the acknowledge bit after menu selection. 0=valid selection, 1=invalid selection.
int8_t menu_2_regulator_settings()
int8_t ack=0;
uint8_t user_
uint8_t user_
uint8_t user_
uint8_t user_
uint8_t user_
int8_t user_
//! Displays the Regulator Settings menu
Serial.print(F(&\nRegulator Settings\n\n&));
Serial.print(F(&
1-Enable/Disable Switchers\n&));
Serial.print(F(&
2-Enable/Disable LDOs\n&));
Serial.print(F(&
3-Set Buck Output Voltage\n&));
Serial.print(F(&
4-Set Buck Feedback Reference\n&));
Serial.print(F(&
5-Select Buck Reference\n&));
Serial.print(F(&
6-Set LDO2 Output Voltage\n&));
Serial.print(F(&
7-Set LDO2 Feedback Reference\n&));
Serial.print(F(&
8-Select LDO2 Reference\n&));
Serial.print(F(&
9-Set Buck Switching Mode\n&));
Serial.print(F(& 10-Set Buck-Boost Switching Mode\n&));
Serial.print(F(& 11-Set Start-Up Mode (300mV check)\n&));
Serial.print(F(& 12-Set PGOOD Slewing Mask Bits\n&));
Serial.print(F(& 13-Set LDO4 Voltage\n&));
Serial.print(F(& 14-Set Switch DV/DT Control\n&));
Serial.print(F(& 15-Set Regulator Slew Rate\n&));
Serial.print(F(& 16-Exit Software Control Mode\n&));
Serial.print(F(&
m-Main Menu\n&));
Serial.print(F(&\nEnter a command: &));
user_command = read_int();
//! Reads the user command
if (user_command == 'm')
// Print m if it is entered
Serial.print(F(&m\n&));
Serial.println(user_command);
// Print user command
//! Reads or writes to a LTC3589 and prints result.
switch (user_command)
//Enter software control mode
if (!LTC3589_bit_is_set(i2c_address, LTC3589_REG_OVEN, LTC3589_SOFTWARE_CNTRL))
Serial.print(F(&\n********** Note: LTC3589 is now in Sofware Control Mode **********\n&));
Serial.print(F(&***************Select Option 16 to resume Pin Control ************\n&));
ack |= LTC3589_bit_set(i2c_address, LTC3589_REG_OVEN, LTC3589_SOFTWARE_CNTRL);
// Enable/Disable Bucks
Serial.print(F(&\nSelect Regulator(1-3=Bucks, 4=Buck-boost, 5=All): &));
user_buck = read_int();
Serial.println(user_buck, DEC);
if (user_buck & 1 || user_buck & 5)
Serial.println(F(&
Invalid input.&));
Serial.println(F(&0=Disable, 1=Enable&));
Serial.print(F(&Enter selection: &));
user_int = read_int();
Serial.println(user_int, DEC);
if (user_int & 1)
Serial.println(F(&
Invalid input.&));
if (user_buck == 5)
ack |= LTC3589_bit_write(i2c_address, LTC3589_REG_OVEN, LTC3589_EN1, user_int);
ack |= LTC3589_bit_write(i2c_address, LTC3589_REG_OVEN, LTC3589_EN2, user_int);
ack |= LTC3589_bit_write(i2c_address, LTC3589_REG_OVEN, LTC3589_EN3, user_int);
ack |= LTC3589_bit_write(i2c_address, LTC3589_REG_OVEN, LTC3589_EN4, user_int);
ack |= LTC3589_bit_write(i2c_address, LTC3589_REG_OVEN, user_buck-1, user_int);
Serial.println(F(&Done.&));
//Enter software control mode
if (!LTC3589_bit_is_set(i2c_address, LTC3589_REG_OVEN, LTC3589_SOFTWARE_CNTRL))
Serial.print(F(&\n********** Note: LTC3589 is now in Sofware Control Mode **********\n&));
Serial.print(F(&***************Select Option 16 to resume Pin Control ************\n&));
ack |= LTC3589_bit_set(i2c_address, LTC3589_REG_OVEN, LTC3589_SOFTWARE_CNTRL);
// Enable/Disable LDOs
Serial.print(F(&\nSelect LDO(2-4, 5=all): &));
user_ldo = read_int();
Serial.println(user_ldo, DEC);
if (user_ldo & 2 || user_ldo & 5)
Serial.println(F(&
Invalid input.&));
Serial.println(F(&0=Disable, 1=Enable&));
Serial.print(F(&Enter selection: &));
user_int = read_int();
Serial.println(user_int, DEC);
if (user_int & 1)
Serial.println(F(&
Invalid input.&));
if (user_ldo == 5)
ack |= LTC3589_bit_write(i2c_address, LTC3589_REG_OVEN, LTC3589_EN_LDO2, user_int);
ack |= LTC3589_bit_write(i2c_address, LTC3589_REG_OVEN, LTC3589_EN_LDO3, user_int);
ack |= LTC3589_bit_write(i2c_address, LTC3589_REG_OVEN, LTC3589_EN_LDO4, user_int);
ack |= LTC3589_bit_write(i2c_address, LTC3589_REG_OVEN, user_ldo+2, user_int);
Serial.println(F(&Done.&));
// Set buck output voltage in mV
float user_
float new_
Serial.print(F(&\nSelect Buck(1-3): &));
user_int = read_int();
Serial.println(user_int, DEC);
if (user_int & 1 || user_int & 3)
Serial.println(F(&Invalid input.&));
if (user_int == 1)
user_register = LTC3589_REG_B1DTV1;
//Converts selection to appropriate register address.
else if (user_int == 2)
user_register = LTC3589_REG_B2DTV1;
//Converts selection to appropriate register address.
else if (user_int == 3)
user_register = LTC3589_REG_B3DTV1;
//Converts selection to appropriate register address.
Serial.print(F(&Select Reference (1=B&));
Serial.print(user_int, DEC);
Serial.print(F(&DTV1, 2=B&));
Serial.print(user_int, DEC);
Serial.print(F(&DTV2): &));
user_char = read_char();
Serial.write(user_char);
if (user_char & '1' || user_char & '2')
Serial.println(F(&\nInvalid input.&));
else if (user_char == '2')
user_register += 1;
//Converts selection of appropriate register address.
Serial.print(F(&\nPotential output voltage range: &));
Serial.print(LTC3589_buck_vout_min(user_int), 0);
Serial.print(F(&mV to &));
Serial.print(LTC3589_buck_vout_max(user_int), 0);
Serial.print(F(&mV.&));
Serial.print(F(&\nNew output voltage in mV: &));
user_output = read_float();
Serial.println(user_output, 0);
if (user_output & LTC3589_buck_vout_min(user_int) | user_output & LTC3589_buck_vout_max(user_int))
Serial.println(F(&\nInvalid input.&));
new_output = LTC3589_set_buck_output_voltage(i2c_address, user_register, user_output);
Serial.print(F(&Output voltage set to &));
Serial.print(new_output, 0);
Serial.println(F(&mV&));
Serial.print(F(&New Feedback Reference Bits: 0x&));
ack |= LTC3589_register_read(i2c_address, user_register, &data);
Serial.println(data & 0x1F, HEX);
// Set buck feedback reference voltage in mV
float user_
float new_
Serial.print(F(&\nSelect Buck(1-3): &));
user_int = read_int();
Serial.println(user_int, DEC);
if (user_int & 1 || user_int & 3)
Serial.println(F(&Invalid input.&));
if (user_int == 1)
user_register = LTC3589_REG_B1DTV1;
//Converts selection to appropriate register address.
else if (user_int == 2)
user_register = LTC3589_REG_B2DTV1;
//Converts selection to appropriate register address.
else if (user_int == 3)
user_register = LTC3589_REG_B3DTV1;
//Converts selection to appropriate register address.
Serial.print(F(&Select Reference (1=B&));
Serial.print(user_int);
Serial.print(F(&DTV1, 2=B&));
Serial.print(user_int);
Serial.print(F(&DTV2): &));
user_char = read_char();
Serial.write(user_char);
if (user_char & '1' || user_char & '2')
Serial.println(F(&\nInvalid input.&));
else if (user_char == '2')
user_register += 1;
//Converts selection of appropriate register address.
Serial.print(F(&\nNew feedback reference input in mV (362.5-750): &));
user_reference = read_float();
Serial.println(user_reference);
if (user_reference & 362.5 | user_reference & 750)
Serial.println(F(&\nInvalid input.&));
new_reference = LTC3589_set_buck_fb_ref(i2c_address, user_register, user_reference);
Serial.print(F(&Feedback reference input set to &));
Serial.print(new_reference, 0);
Serial.println(F(&mV&));
Serial.print(F(&New Feedback Reference Bits: 0x&));
ack |= LTC3589_register_read(i2c_address, user_register, &data);
Serial.println(data & 0x1F, HEX);
// Select buck reference (1 or 2)
Serial.print(F(&\nSelect Buck(1-3, 4=all): &));
user_buck = read_int();
Serial.println(user_buck, DEC);
if (user_buck & 1 || user_buck & 4)
Serial.println(F(&
Invalid input.&));
Serial.print(F(&Select Reference 1 or 2): &));
user_char = read_char();
Serial.write(user_char);
if (user_char == '1' || user_char == '2')
if (user_buck == 4)
ack |= LTC3589_select_buck_reference(i2c_address, 0xFF, user_char);
ack |= LTC3589_select_buck_reference(i2c_address, user_buck, user_char);
Serial.println(F(&\nDone.&));
Serial.println(F(&\n
Invalid input.&));
// Set LDO2 output voltage in mV
user_register = LTC3589_REG_L2DTV1;
Serial.print(F(&Select Reference (1=L2DTV1, 2=L2DTV2): &));
user_char = read_char();
Serial.write(user_char);
if (user_char & '1' || user_char & '2')
Serial.println(F(&\nInvalid input.&));
else if (user_char == '2')
user_register += 1;
//Converts selection of appropriate register address.
Serial.print(F(&\nPotential output voltage range: &));
Serial.print(LTC3589_ldo2_vout_min(), 0);
Serial.print(F(&mV to &));
Serial.print(LTC3589_ldo2_vout_max(), 0);
Serial.print(F(&mV&));
Serial.print(F(&\nNew output voltage in mV: &));
user_output = read_float();
Serial.println(user_output, 0);
if (user_output & LTC3589_ldo2_vout_min() | user_output & LTC3589_ldo2_vout_max())
Serial.println(F(&\nInvalid input.&));
new_output = LTC3589_set_ldo2_output_voltage(i2c_address, user_register, user_output);
Serial.print(F(&Output voltage set to &));
Serial.print(new_output, 0);
Serial.println(F(&mV&));
Serial.print(F(&New Feedback Reference Bits: 0x&));
ack |= LTC3589_register_read(i2c_address, user_register, &data);
Serial.println(data & 0x1F, HEX);
// Set LDO2 feedback reference voltage in mV
Serial.print(F(&Select Reference (1=L2DTV1, 2=L2DTV2): &));
user_char = read_char();
Serial.write(user_char);
if (user_char & '1' || user_char & '2')
Serial.println(F(&\nInvalid input.&));
else if (user_char == '2')
user_register += 1;
//Converts selection of appropriate register address.
Serial.print(F(&\nNew feedback reference input in mV (362.5-750): &));
user_reference = read_float();
Serial.println(user_reference);
if (user_reference & 362.5 | user_reference & 750)
Serial.println(F(&\nInvalid input.&));
new_reference = LTC3589_set_ldo2_fb_ref(i2c_address, user_register, user_reference);
Serial.print(F(&Feedback reference input set to &));
Serial.print(new_reference, 0);
Serial.println(F(&mV&));
Serial.print(F(&New Feedback Reference Bits: 0x&));
ack |= LTC3589_register_read(i2c_address, user_register, &data);
Serial.println(data & 0x1F, HEX);
// Select LDO2 reference (1 or 2)
Serial.print(F(&Select Reference 1 or 2): &));
user_char = read_char();
Serial.write(user_char);
if (user_char == '1' || user_char == '2')
ack |= LTC3589_select_ldo2_reference(i2c_address, user_char);
Serial.println(F(&\nDone.&));
Serial.println(F(&\n
Invalid input.&));
// Set buck switching mode
Serial.print(F(&\nSelect Buck(1-3, 4=all): &));
user_register = read_int();
Serial.println(user_register, DEC);
if (user_register & 1 || user_register & 4)
Serial.println(F(&
Invalid input.&));
Serial.print(F(&Select mode (0=Pulse Skipping, 1=Burst, 2=Forced Continuous): &));
user_int = read_int();
Serial.println(user_int, DEC);
if (user_int & 0 || user_int & 2)
Serial.println(F(&
Invalid input.&));
if (user_register == 4)
ack |= LTC3589_set_buck_mode(i2c_address, 0xFF, user_int);
ack |= LTC3589_set_buck_mode(i2c_address, user_register, user_int);
Serial.println(F(&Switching mode(s) set.&));
// Set buck-boost switching mode
Serial.print(F(&Select mode (0=Continuous, 1=Burst): &));
user_int = read_int();
Serial.println(user_int, DEC);
if (user_int & 0 || user_int & 1)
Serial.println(F(&
Invalid input.&));
ack |= LTC3589_bit_write(i2c_address, LTC3589_REG_SCR1, LTC3589_BUCKBOOST_MODE, user_int);
Serial.println(F(&Switching mode(s) set.&));
// Sets the startup mode for all bucks
Serial.println(F(&0=Wait for output &300mV to enable, 1=Don't wait & disable discharge resistor&));
//Standard and -1 Option
// Serial.println(F(&0=Enable at any output voltage, 1=Wait for output &300mV to enable&));
//-2 Option
Serial.print(F(&\nSelect start-up mode: &));
Serial.print(F(&Enter selection: &));
user_int = read_int();
Serial.println(user_int, DEC);
if (user_int & 0 || user_int & 1)
Serial.println(F(&
Invalid input.&));
Serial.println(F(&Start-up modes set.&));
// Sets PGOOD mask bit.
Serial.println(F(&0=PGOOD low when slewing, 1=PGOOD not forced low when slewing&));
Serial.print(F(&Enter selection: &));
user_int = read_int();
Serial.println(user_int, DEC);
if (user_int & 0 || user_int & 1)
Serial.println(F(&
Invalid input.&));
ack |= LTC3589_set_pgood_mask(i2c_address, user_int);
Serial.println(F(&PGOOD Mask bits set.&));
// Set LDO4 Output Voltage
//if (board_option == 'B')
if (demo_board.option == 'A' || demo_board.option == 'B')
Serial.print(F(&Select LDO4 Voltage (0=1.2V, 1=1.8V, 2=2.5V, 3=3.2V): &));
Serial.print(F(&Select LDO4 Voltage (0=2.8V, 1=2.5V, 2=1.8V, 3=3.3V): &));
user_int = read_int();
Serial.println(user_int, DEC);
if (user_int & 3)
Serial.println(F(&
Invalid input.&));
ack |= LTC3589_set_ldo4_voltage(i2c_address, user_int);
Serial.println(F(&LDO4 Voltage Set.&));
//Serial.println(& Invalid Selection&);
// Set switch DV/DT control
Serial.print(F(&Select DV/DT Control (0=1ns, 1=2ns, 2=4ns, 3=8ns): &));
user_int = read_int();
Serial.println(user_int, DEC);
if (user_int & 3)
Serial.println(F(&
Invalid input.&));
ack |= LTC3589_set_switch_dvdt_control(i2c_address, user_int);
Serial.println(F(&Switch DV/DT Set.&));
// Set regulator slew rate
Serial.print(F(&\nSelect Regulator(1-3=Bucks, 4=LDO2, 5=All): &));
user_buck = read_int();
Serial.println(user_buck, DEC);
if (user_buck & 1 || user_buck & 5)
Serial.println(F(&
Invalid input.&));
Serial.print(F(&Select Slew Rate (0=0.88mV/us, 1=1.75mV/us, 2=3.5mV/us, 3=7mV/us): &));
user_int = read_int();
Serial.println(user_int, DEC);
if (user_int & 3)
Serial.println(F(&
Invalid input.&));
if (user_buck == 5)
ack |= LTC3589_set_regulator_slew(i2c_address, 0xFF, user_int);
ack |= LTC3589_set_regulator_slew(i2c_address, 3&&((user_buck-1)*2), user_int);
Serial.println(F(&Done.&));
// Exit software control mode
ack |= LTC3589_bit_clear(i2c_address, LTC3589_REG_OVEN, LTC3589_SOFTWARE_CNTRL);
Serial.println(F(&\nDone.&));
if (user_command != 'm')
Serial.println(& Invalid Selection&);
while ((user_command != 'm') && (ack != 1));
return (ack);
//! Prints the Powerup Sequencing menu and handles the user response.
//! @return State of the acknowledge bit after menu selection. 0=valid selection, 1=invalid selection.
int8_t menu_3_sequencing(uint8_t *reg_phase)
int8_t ack=0;
uint8_t user_
uint8_t user_
uint8_t user_
uint8_t reg_map[6];
uint8_t reg_
uint8_t reg_bit_position[7] = {0,1,2,3,4,5,6};
//Enter software control mode
if (!LTC3589_bit_is_set(i2c_address, LTC3589_REG_OVEN, LTC3589_SOFTWARE_CNTRL))
Serial.print(F(&\n********** Note: LTC3589 is now in Sofware Control Mode **********\n&));
Serial.print(F(&************** Select Option 5 to resume Pin Control *************\n&));
ack |= LTC3589_bit_set(i2c_address, LTC3589_REG_OVEN, LTC3589_SOFTWARE_CNTRL);
//! Displays the Startup Sequencing menu
Serial.print(F(&\nPowerup Sequencing\n\n&));
Serial.print(F(&
1-Set Power-up Sequence\n&));
Serial.print(F(&
2-Print Power-up Sequence\n&));
Serial.print(F(&
3-Power-up Regulators\n&));
Serial.print(F(&
4-Power-down Regulators\n&));
Serial.print(F(&
5-Exit Software Control Mode\n&));
Serial.print(F(&
m-Main Menu\n&));
Serial.print(F(&\nEnter a command: &));
user_command = read_int();
//! Reads the user command
if (user_command == 'm')
// Print m if it is entered
Serial.print(F(&m\n&));
Serial.println(user_command);
// Print user command
switch (user_command)
Serial.println(F(&\nRegulators will power-up in 4 phases&));
Serial.println(F(&Select a phase for each&));
Serial.println(F(&1=First phase, 2=Second phase, 3=Third phase, 4=Fourth phase, 0=Don't enable&));
Serial.print(F(&Buck1: &));
user_int = read_int();
Serial.println(user_int, DEC);
if (user_int & 5)
reg_phase[0] = user_
Serial.print(F(&Buck2: &));
user_int = read_int();
Serial.println(user_int, DEC);
if (user_int & 5)
reg_phase[1] = user_
Serial.print(F(&Buck3: &));
user_int = read_int();
Serial.println(user_int, DEC);
if (user_int & 5)
reg_phase[2] = user_
Serial.print(F(&BB:
user_int = read_int();
Serial.println(user_int, DEC);
if (user_int & 5)
reg_phase[3] = user_
Serial.print(F(&LDO2:
user_int = read_int();
Serial.println(user_int, DEC);
if (user_int & 5)
reg_phase[4] = user_
Serial.print(F(&LDO3:
user_int = read_int();
Serial.println(user_int, DEC);
if (user_int & 5)
reg_phase[5] = user_
Serial.print(F(&LDO4:
user_int = read_int();
Serial.println(user_int, DEC);
if (user_int & 5)
reg_phase[6] = user_
Serial.print(F(&Enter delay between phases in milliseconds: &));
delay_ms = read_float();
if (delay_ms &= 0 && delay_ms &= 10000)
Serial.println(delay_ms, 1);
Serial.println(F(&Values less than 0 or greater than 10s not allowed.&));
Serial.print(F(&\nBuck1: &));
Serial.println(reg_phase[0]);
Serial.print(F(&Buck2: &));
Serial.println(reg_phase[1]);
Serial.print(F(&Buck3: &));
Serial.println(reg_phase[2]);
Serial.print(F(&BB:
Serial.println(reg_phase[3]);
Serial.print(F(&LDO2:
Serial.println(reg_phase[4]);
Serial.print(F(&LDO3:
Serial.println(reg_phase[5]);
Serial.print(F(&LDO4:
Serial.println(reg_phase[6]);
Serial.print(F(&Delay: &));
Serial.print(delay_ms, 1);
Serial.println(F(&ms&));
ack |= LTC3589_register_read(i2c_address, LTC3589_REG_OVEN, &reg_oven);
//Start Phase 1 Regulators
for (count=0; count&7; count++)
if (reg_phase[count] == 1)
reg_oven |= 0x01&&reg_bit_position[count];
ack |= LTC3589_register_write(i2c_address, LTC3589_REG_OVEN, reg_oven);
delay(delay_ms);
//Start Phase 2 Regulators
for (count=0; count&7; count++)
if (reg_phase[count] == 2)
reg_oven |= 0x01&&reg_bit_position[count];
ack |= LTC3589_register_write(i2c_address, LTC3589_REG_OVEN, reg_oven);
delay(delay_ms);
//Start Phase 3 Regulators
for (count=0; count&7; count++)
if (reg_phase[count] == 3)
reg_oven |= 0x01&&reg_bit_position[count];
ack |= LTC3589_register_write(i2c_address, LTC3589_REG_OVEN, reg_oven);
delay(delay_ms);
//Start Phase 4 Regulators
for (count=0; count&7; count++)
if (reg_phase[count] == 4)
reg_oven |= 0x01&&reg_bit_position[count];
ack |= LTC3589_register_write(i2c_address, LTC3589_REG_OVEN, reg_oven);
// Power-down by clearing all enable bits
ack |= LTC3589_register_write(i2c_address, LTC3589_REG_OVEN, 0x80);
// Exit software control mode
ack |= LTC3589_bit_clear(i2c_address, LTC3589_REG_OVEN, LTC3589_SOFTWARE_CNTRL);
user_command = 'm';
if (user_command != 'm')
Serial.println(& Invalid Selection&);
while ((user_command != 'm') && (ack != 1));
return (ack);
//! Prints the title block when program first starts.
void print_title()
Serial.print(F(&\n******************************************************************\n&));
Serial.print(F(&* DC1558A Demonstration Program
Serial.print(F(&*
Serial.print(F(&* This program demonstrates how to send and receive data from
Serial.print(F(&* the LTC3589 8-Output Regulator with Sequencing and I2C.
Serial.print(F(&*
Serial.print(F(&* Setup:
Serial.print(F(&* Set the baud rate to 115200 and select the newline terminator. *\n&));
Serial.print(F(&* Set all switches in SW1 to their default position.
Serial.print(F(&* Tie PWR_ON high by connecting it to VIN.
Serial.print(F(&* Power VIN from an external power supply.
Serial.print(F(&*
Serial.print(F(&* Note:
Serial.print(F(&* For proper IRQ LED behavior, move resistor R39 to the
Serial.print(F(&* optional R38 position on the DC2026B.
Serial.print(F(&******************************************************************\n&));
//! Prints main menu.
void print_prompt()
Serial.print(F(&\n
1-Read/Write Registers\n&));
Serial.print(F(&
2-Regulator Settings\n&));
Serial.print(F(&
3-Sequencing\n&));
Serial.print(F(&\nEnter a command:&));
//! Prints a warning that no demo board was not detected.
void print_warning_prompt()
Serial.println(F(&\nWarning: Demo board not detected. Linduino will attempt to proceed.&));
//! Reads and prints the data in every register
//! @return State of the acknowledge bit. 0=acknowledge, 1=no acknowledge.
int8_t LTC3589_print_all_registers(uint8_t i2c_address)
int8_t ack = 0;
for (i=0; i&sizeof(reg_read_list); i++)
ack |= LTC3589_register_read(i2c_address, reg_read_list[i], &data);
//! Read register
Serial.print(&Register 0x&);
Serial.print(reg_read_list[i], HEX);
Serial.print(&:\t0x&);
Serial.println(data, HEX);
//! Checks to see if a register address is a valid address in this device.
//! @return State of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge.
boolean valid_register(uint8_t user_register, uint8_t register_array[], uint8_t array_length)
uint8_t i=0;
for (i=0; i&array_ i++)
if (register_array[i] == user_register)
//! Read the ID string from the EEPROM to identify the connected demo board.
//! @return Returns 1 if successful, 0 if not successful
int8_t discover_demo_boards(char *demo_name_1, char *demo_name_2)
connected = 1;
// read the ID from the serial EEPROM on the board
// reuse the buffer declared in UserInterface
if (read_quikeval_id_string(&ui_buffer[0]) == 0) connected = 0;
// make sure it is the correct demo board
if (strcmp(demo_board.name, demo_name_1) == 0) connected = 1;
else if (strcmp(demo_board.name, demo_name_2) == 0) connected = 1;
else connected = 0;
if (connected != 0)
Serial.print(&Demo Board Name: &);
Serial.println(demo_board.name);
Serial.print(&Product Name: &);
Serial.println(demo_board.product_name);
if (demo_board.option)
Serial.print(&Demo Board Option: &);
Serial.println(demo_board.option);
Serial.print(&Demo board not found, \nfound &);
Serial.print(demo_board.name);
Serial.println(& instead. \nConnect the correct demo board, then press the reset button.&);
return(connected);
LTC3589: 8-Output Regulator with Sequencing and I2C
The LTC3589 is a complete power management solution for ARM and ARM-based
processors and advanced portable microprocessor systems. The device contains
three step-down DC/DC converters for core, memory and SoC rails, a
buck-boost regulator for I/O at 1.8V to 5V and three 250mA LDO regulators
for low noise analog supplies. An I2C serial port is used to control enables,
output voltage levels, dynamic voltage scaling, operating modes and status
reporting.
Regulator start-up is sequenced by connecting outputs to enable pins in the
desired order or programmed via the I2C port. System power-on, power-off,
and reset functions are controlled by pushbutton interface, pin inputs, or
I2C interface.
The LTC3589 supports i.MX53/51, PXA and OMAP processors with eight
independent rails at appropriate power levels. Other features include
interface signals such as the VSTB pin that simultaneously toggle up to
four rails between programmed run and standby output voltages.
The device
is available in a low profile 40-pin 6mm x 6mm exposed pad QFN package.
I2C DATA FORMAT (MSB FIRST);
@endverbatim
/product/LTC3589
/product/LTC3589#demoboards
REVISION HISTORY
$Revision: 5045 $
Copyright (c) 2014, Linear Technology Corp.(LTC)
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS &AS IS& AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
The views and conclusions contained in the software and documentation are those
of the authors and should not be interpreted as representing official policies,
either expressed or implied, of Linear Technology Corp.
The Linear Technology Linduino is not affiliated with the official Arduino team.
However, the Linduino is only possible because of the Arduino team's commitment
to the open-source community.
Please, visit http://www.arduino.cc and
http://store.arduino.cc , and consider a purchase that will help fund their
ongoing work.
@ingroup LTC3589
Library Header File for LTC3589: 8-Output Regulator with Sequencing and I2C
#ifndef LTC3589_H
#define LTC3589_H
/*! @name I2C Address
I2C address of the LTC3589/LTC3589-1/LTC3589-2.
/* LTC3589 I2C Addresses */
#define LTC3589_I2C_ADDRESS
/*! @name Feedback Resistors
Factory feedback resistor values for the LTC3589 demo boards in kOhm.
#define LTC3589_RES_BUCK1_RTOP
#define LTC3589_RES_BUCK1_RBOT
#define LTC3589_RES_BUCK2_RTOP
#define LTC3589_RES_BUCK2_RBOT
#define LTC3589_RES_BUCK3_RTOP
#define LTC3589_RES_BUCK3_RBOT
#define LTC3589_RES_LDO2_RTOP
#define LTC3589_RES_LDO2_RBOT
/*! @name Registers
/* LTC3589 Registers */
#define LTC3589_REG_SCR1
#define LTC3589_REG_OVEN
#define LTC3589_REG_SCR2
#define LTC3589_REG_VCCR
#define LTC3589_REG_CLIRQ
#define LTC3589_REG_B1DTV1
#define LTC3589_REG_B1DTV2
#define LTC3589_REG_VRRCR
#define LTC3589_REG_B2DTV1
#define LTC3589_REG_B2DTV2
#define LTC3589_REG_B3DTV1
#define LTC3589_REG_B3DTV2
#define LTC3589_REG_L2DTV1
#define LTC3589_REG_L2DTV2
#define LTC3589_REG_IRQSTAT
#define LTC3589_REG_PGSTAT
/*! @name LTC3589_REG_SCR1 Register Settings
Bit position of single bit settings in the LTC3589_REG_SCR1 registers.
#define LTC3589_BUCKBOOST_MODE
/*! @name LTC3589_REG_OVEN Register Settings
Bit position of single bit settings in the LTC3589_REG_OVEN register.
#define LTC3589_SOFTWARE_CNTRL
#define LTC3589_EN_LDO4
#define LTC3589_EN_LDO3
#define LTC3589_EN_LDO2
#define LTC3589_EN4
#define LTC3589_EN3
#define LTC3589_EN2
#define LTC3589_EN1
/*! @name LTC3589_REG_SCR2 Register Settings
Bit position of single bit settings in the LTC3589_REG_SCR2 register.
#define LTC3589_MASK_PG_SHUTDOWN
#define LTC3589_LDO4_STARTUP
#define LTC3589_LDO3_STARTUP
#define LTC3589_LDO2_STARTUP
#define LTC3589_BB_STARTUP
#define LTC3589_BUCK3_STARTUP
#define LTC3589_BUCK2_STARTUP
#define LTC3589_BUCK1_STARTUP
/*! @name LTC3589_REG_VCCR Register Settings
Bit position of single bit settings in the LTC3589_REG_VCCR register.
#define LTC3589_LDO2_REF_SELECT
#define LTC3589_LDO2_GO
#define LTC3589_BUCK3_REF_SELECT
#define LTC3589_BUCK3_GO
#define LTC3589_BUCK2_REF_SELECT
#define LTC3589_BUCK2_GO
#define LTC3589_BUCK1_REF_SELECT
#define LTC3589_BUCK1_GO
/*! @name LTC3589_REG_BxDTV1 Register Settings
Bit position of single bit settings in the LTC3589_REG_BxDTV1 registers.
#define LTC3589_BUCK_PG_MASK
/*! @name LTC3589_REG_BxDTV2 Register Settings
Bit position of single bit settings in the LTC3589_REG_BxDTV2 register.
#define LTC3589_BUCK_KEEP_ALIVE
#define LTC3589_BUCK_PHASE_SEL
#define LTC3589_BUCK_CLOCK_RATE
/*! @name LTC3589_REG_L2DTV1 Register Settings
Bit position of single bit settings in the LTC3589_REG_L2DTV1 register.
#define LTC3589_LDO2_KEEP_ALIVE
#define LTC3589_LDO2_PG_MASK
/*! @name LTC3589_REG_L2DTV2 Register Settings
Bit position of single bit settings in the LTC3589_REG_L2DTV2 register.
#define LTC3589_LDO2_CNTRL_MODE
/*! @name LTC3589_REG_IRQSTAT Register Settings
Bit position of status bits in the LTC3589_REG_IRQSTAT register.
#define LTC3589_IRQ_OT_SHUTDOWN
#define LTC3589_IRQ_OT_WARNING
#define LTC3589_IRQ_UV_SHUTDOWN
#define LTC3589_IRQ_UV_WARNING
#define LTC3589_IRQ_PG_SHUTDOWN
/*! @name LTC3589_REG_PGSTAT Register Settings
Bit position of status bits in the LTC3589_REG_PGSTAT register.
#define LTC3589_PG_LDO4
#define LTC3589_PG_LDO3
#define LTC3589_PG_LDO2
#define LTC3589_PG_BB
#define LTC3589_PG_BUCK3
#define LTC3589_PG_BUCK2
#define LTC3589_PG_BUCK1
#define LTC3589_PG_LDO1
/*! @name LTC3589 Mask Settings
Bitwise AND with register data to determine present setting.
#define LTC3589_BUCK_MODE_MASK(num) (0x03&&((num)*2)-2)
#define LTC3589_BUCK3_MODE_MASK
#define LTC3589_BUCK2_MODE_MASK
#define LTC3589_BUCK1_MODE_MASK
#define LTC3589_BUCK_DVDT_MASK
#define LTC3589_FB_REF_MASK
#define LTC3589_LDO2_SLEW_MASK
#define LTC3589_BUCK3_SLEW_MASK
#define LTC3589_BUCK2_SLEW_MASK
#define LTC3589_BUCK1_SLEW_MASK
#define LTC3589_LDO4_VOLTAGE_MASK
//! Reads an 8-bit register from the LTC3589 using the standard repeated start format.
//! @return State of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge.
int8_t LTC3589_register_read(uint8_t i2c_address,
//!& I2C address of the LTC3589.
uint8_t register_address,
//!& Address of the LTC3589 register to be read. This is also known as the &command byte&.
uint8_t *register_data
//!& returns 8-bit value read from the LTC3589 register.
//! Writes to an 8-bit register inside the LTC3589 using the standard I2C repeated start format.
//! @return State of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge.
int8_t LTC3589_register_write(uint8_t i2c_address,
//!& I2C address of the LTC3589.
uint8_t register_address, //!& Address of the LTC3589 register to be overwritten.
This is also known as the &command byte&.
uint8_t register_data
//!& Value that will be written to the register.
//! Sets any bit inside the LTC3589 using the standard I2C repeated start format.
//! @return State of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge.
int8_t LTC3589_bit_set(uint8_t i2c_address,
//!& I2C address of the LTC3589.
uint8_t register_address, //!& Address of the LTC3589 register to be overwritten.
This is also known as the &command byte&.
uint8_t bit_number
//!& Bit location (0-7) to be written.
//! Clears any bit inside the LTC3589 using the standard I2C repeated start format.
//! @return State of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge.
int8_t LTC3589_bit_clear(uint8_t i2c_address,
//!& I2C address of the LTC3589.
uint8_t register_address, //!& Address of the LTC3589 register to be overwritten.
This is also known as the &command byte&.
uint8_t bit_number
//!& Address of the bit to set within the register.
//! Writes any bit inside the LTC3589 using the standard I2C repeated start format.
//! @return State of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge.
int8_t LTC3589_bit_write(uint8_t i2c_address,
//!& I2C address of the LTC3589.
uint8_t register_address,
//!& Address of the LTC3589 register to be written.
uint8_t bit_number,
//!& Bit location (0-7) to be written.
uint8_t bit_data
//!& Bit data (0 or 1) to be written.
//! Reads the value of any bit in any register or the LTC3589.
//! @return Bit value at the passed register subaddress and bit location.
uint8_t LTC3589_bit_is_set(uint8_t i2c_address,
//!& I2C address of the LTC3589.
uint8_t register_address,
//!& Address of the LTC3589 register to be read. This is also known as the &command byte&.
uint8_t bit_number
//!& Bit location (0-7) to be read.
//! Sets the output voltage of LDO2.
//! @return New LDO2 output voltage, the closest allowable voltage to the user's chosen voltage.
float LTC3589_set_ldo2_output_voltage(uint8_t i2c_address, //!& I2C address of the LTC3589.
uint8_t register_address, //!& Address of the LTC3589 LDO2 FB reference register to be written.
float output_voltage //!& New output voltage to set, in mV. Assumes a valid voltage for the feedback resistors.
//! Sets the output voltage of any buck.
//! @return New buck output voltage, the closest allowable voltage to the user's chosen voltage.
float LTC3589_set_buck_output_voltage(uint8_t i2c_address, //!& I2C address of the LTC3589.
uint8_t register_address, //!& Address of the LTC3589 Buck FB reference register to be written.
float output_voltage //!& New output voltage to set, in mV. Assumes a valid voltage for the feedback resistors.
//! Writes the Feedback Reference Voltage of LDO2.
//! @return New Feedback Reference Input Voltage, the closest allowable voltage to the user's chosen voltage.
float LTC3589_set_ldo2_fb_ref(uint8_t i2c_address, //!& I2C address of the LTC3589.
uint8_t register_address, //!& Address of the LTC3589 LDO2 FB reference register to be written.
float fb_ref_voltage //!& New Feedback Reference voltage to set in mV.
Values between 362.5 and 750 are allowed.
//! Writes the Feedback Reference Voltage of any buck.
//! @return New Feedback Reference Input Voltage, the closest allowable voltage to the user's chosen voltage.
float LTC3589_set_buck_fb_ref(uint8_t i2c_address, //!& I2C address of the LTC3589.
uint8_t register_address, //!& Address of the LTC3589 Buck FB reference register to be written.
float fb_ref_voltage //!& New Feedback Reference voltage to set in mV.
Values between 362.5 and 750 are allowed.
//! Calculates the maximum output voltage of LDO2 in mV based on the feedback resistors.
//! @return Maximum possible output voltage for LDO2.
float LTC3589_ldo2_vout_max();
//! Calculates the minimum output voltage of LDO2 mV based on the feedback resistors.
//! @return Minimum possible output voltage for LDO2.
float LTC3589_ldo2_vout_min();
//! Calculates the maximum output voltage of any buck in mV based on the feedback resistors.
//! @return Maximum possible output voltage for the selected buck.
float LTC3589_buck_vout_max(uint8_t buck_number //!& Number (1-3) of buck.
//! Calculates the minimum output voltage of any buck in mV based on the feedback resistors.
//! @return Minimum possible output voltage for the selected buck.
float LTC3589_buck_vout_min(uint8_t buck_number //!& Number (1-3) of buck.
//! Selects the reference for LDO2.
//! @return State of the acknowledge bit after the I2C addresss write. 0=acknowledge, 1=no acknowledge.
int8_t LTC3589_select_ldo2_reference(uint8_t i2c_address, //!& I2C address of the LTC3589.
int8_t ref_char //!& Reference to select (A or B).
//! Selects the reference for the specified buck regulator(s).
//! @return State of the acknowledge bit after the I2C addresss write. 0=acknowledge, 1=no acknowledge.
int8_t LTC3589_select_buck_reference(uint8_t i2c_address, //!& I2C address of the LTC3589.
uint8_t buck_number, //!& Number (1-3) of the buck whose reference will be selected. Enter 0xFF for all bucks.
int8_t ref_char //!& Reference to select (A or B).
//! Sets the switching mode for the specified buck regulator(s).
//! @return State of the acknowledge bit after the I2C addresss write. 0=acknowledge, 1=no acknowledge.
int8_t LTC3589_set_buck_mode(uint8_t i2c_address, //!& I2C address of the LTC3589.
uint8_t buck_number, //!& Number (1-3) of the buck to set. Enter 0xFF for all bucks.
uint8_t mode //!& Switching mode to be set (0=pulse skipping, 1=burst, 2=forced continuous)
//! Sets the switching mode for the buck-boost regulator.
//! @return State of the acknowledge bit after the I2C addresss write. 0=acknowledge, 1=no acknowledge.
int8_t LTC3589_set_buckboost_mode(uint8_t i2c_address, //!& I2C address of the LTC3589.
uint8_t mode //!& Switching mode to be set (0=pulse skipping, 1=burst, 2=forced continuous)
//! Sets the start-up mode for all regulators.
//! @return State of the acknowledge bit after the I2C addresss write. 0=acknowledge, 1=no acknowledge.
int8_t LTC3589_set_startup_mode(uint8_t i2c_address, //!& I2C address of the LTC3589.
uint8_t startup_bit //!& Data to write to start-up bit (0=enable at any output, 1=enable only if output &300mV)
//! Sets the PGOOD mask bit for all bucks and LDO2.
//! @return State of the acknowledge bit after the I2C addresss write. 0=acknowledge, 1=no acknowledge.
int8_t LTC3589_set_pgood_mask(uint8_t i2c_address, //!& I2C address of the LTC3589.
uint8_t pgood_bit //!& Data to write to PGOOD bit (0=PGOOD low when slewing, 1=PGOOD not forced low when slewing)
//! Sets LDO4 output voltage on the LTC3589.
//! @return State of the acknowledge bit after the I2C addresss write. 0=acknowledge, 1=no acknowledge.
int8_t LTC3589_set_ldo4_voltage(uint8_t i2c_address, //!& I2C address of the LTC3589.
uint8_t ldo4_output_voltage_code //!& Voltage code for new LDO4 output voltage (varies by part option).
//! Sets the dynamnic reference slew rate for the regulator(s).
//! @return State of the acknowledge bit after the I2C addresss write. 0=acknowledge, 1=no acknowledge.
int8_t LTC3589_set_regulator_slew(uint8_t i2c_address, //!& I2C address of the LTC3589.
uint8_t regulator_mask, //!& Mask of the regulator to set. Enter 0xFF for all regulators.
uint8_t slew_rate //!& Slew rate code to set.
//! Sets the switch DV/DT control for the buck regulators.
//! @return State of the acknowledge bit after the I2C addresss write. 0=acknowledge, 1=no acknowledge.
int8_t LTC3589_set_switch_dvdt_control(uint8_t i2c_address, //!& I2C address of the LTC3589.
uint8_t dvdt_control_bits //!& Two-bit DV/DT control code to set.
//! Sets all of the GO bits in the VCCR register.
int8_t LTC3589_set_go_bits(uint8_t i2c_address //!& I2C address of the LTC3589.
LTC3589: 8-Output Regulator with Sequencing and I2C
The LTC3589 is a complete power management solution for ARM and ARM-based
processors and advanced portable microprocessor systems. The device contains
three step-down DC/DC converters for core, memory and SoC rails, a
buck-boost regulator for I/O at 1.8V to 5V and three 250mA LDO regulators
for low noise analog supplies. An I2C serial port is used to control enables,
output voltage levels, dynamic voltage scaling, operating modes and status
reporting.
Regulator start-up is sequenced by connecting outputs to enable pins in the
desired order or programmed via the I2C port. System power-on, power-off,
and reset functions are controlled by pushbutton interface, pin inputs, or
I2C interface.
The LTC3589 supports i.MX53/51, PXA and OMAP processors with eight
independent rails at appropriate power levels. Other features include
interface signals such as the VSTB pin that simultaneously toggle up to
four rails between programmed run and standby output voltages.
The device
is available in a low profile 40-pin 6mm x 6mm exposed pad QFN package.
I2C DATA FORMAT (MSB FIRST)
@endverbatim
/product/LTC3589
/product/LTC3589#demoboards
REVISION HISTORY
$Revision: 5045 $
Copyright (c) 2013, Linear Technology Corp.(LTC)
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS &AS IS& AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
The views and conclusions contained in the software and documentation are those
of the authors and should not be interpreted as representing official policies,
either expressed or implied, of Linear Technology Corp.
The Linear Technology Linduino is not affiliated with the official Arduino team.
However, the Linduino is only possible because of the Arduino team's commitment
to the open-source community.
Please, visit http://www.arduino.cc and
http://store.arduino.cc , and consider a purchase that will help fund their
ongoing work.
//! @defgroup LTC3589 LTC3589: 8-Output Regulator with Sequencing and I2C
@ingroup LTC3589
Library for LTC3589: 8-Output Regulator with Sequencing and I2C
#include &Arduino.h&
#include &stdint.h&
#include &math.h&
#include &Linduino.h&
#include &LT_I2C.h&
#include &LTC3589.h&
// Reads an 8-bit register from the LTC3589 using the standard repeated start format.
int8_t LTC3589_register_read(uint8_t i2c_address, uint8_t register_address, uint8_t *register_data)
int8_t ack = 0;
ack = i2c_read_byte_data(i2c_address, register_address, register_data);
return(ack);
// Writes to an 8-bit register inside the LTC3589 using the standard I2C repeated start format.
int8_t LTC3589_register_write(uint8_t i2c_address, uint8_t register_address, uint8_t register_data)
int8_t ack = 0;
ack = i2c_write_byte_data(i2c_address, register_address, register_data);
return(ack);
// Sets any bit inside the LTC3589 using the standard I2C repeated start format.
int8_t LTC3589_bit_set(uint8_t i2c_address, uint8_t register_address, uint8_t bit_number)
uint8_t register_
uint8_t bit_
int8_t ack = 0;
bit_mask = 0x01 && bit_
ack |= LTC3589_register_read(i2c_address, register_address, &register_data);
//Read register
register_data = register_data | bit_
//Set the bit at bit_address
ack |= LTC3589_register_write(i2c_address, register_address, register_data);
//Write new data to register
return(ack);
// Clears any bit inside the LTC3589 using the standard I2C repeated start format.
int8_t LTC3589_bit_clear(uint8_t i2c_address, uint8_t register_address, uint8_t bit_number)
uint8_t register_
uint8_t bit_
int8_t ack = 0;
bit_mask = 0x01 && bit_
ack |= LTC3589_register_read(i2c_address, register_address, &register_data);
//Read register
register_data = register_data & (~bit_mask);
//Clears the bit at bit_address
ack |= LTC3589_register_write(i2c_address, register_address, register_data);
//Write new data to register
return(ack);
// Writes any bit inside the LTC3589 using the standard I2C repeated start format.
int8_t LTC3589_bit_write(uint8_t i2c_address, uint8_t register_address, uint8_t bit_number, uint8_t bit_data)
uint8_t register_
uint8_t bit_
int8_t ack = 0;
bit_mask = 0x01 && bit_
ack |= LTC3589_register_read(i2c_address, register_address, &register_data);
//Read register
register_data = register_data & (~bit_mask);
//Clears the bit at bit_address
register_data = register_data | ((bit_data & 0x01) && bit_number);
//Writes the new bit
ack |= LTC3589_register_write(i2c_address, register_address, register_data);
//Write new data to register
return(ack);
// Reads the value of any bit in any register or the LTC3589.
uint8_t LTC3589_bit_is_set(uint8_t i2c_address, uint8_t register_address, uint8_t bit_number)
uint8_t register_
int8_t ack = 0;
ack |= LTC3589_register_read(i2c_address, register_address, &register_data);
register_data = register_data && bit_
//Clears everything but the bit of interest
return (register_data & 0x01);
// Sets the output voltage of LDO2.
float LTC3589_set_ldo2_output_voltage(uint8_t i2c_address, uint8_t register_address, float output_voltage)
uint8_t register_
float fb_ref = 0;
int8_t nack = 0;
if (register_address == 0x32 | register_address == 0x33)
fb_ref = output_voltage / (1 + LTC3589_RES_LDO2_RTOP/LTC3589_RES_LDO2_RBOT);
//Generates desired FB reference input for given output voltage.
return (1 + LTC3589_RES_LDO2_RTOP/LTC3589_RES_LDO2_RBOT) * LTC3589_set_ldo2_fb_ref(i2c_address, register_address, fb_ref);
//Writes new buck output fb refernce.
// Sets the output voltage of any buck.
float LTC3589_set_buck_output_voltage(uint8_t i2c_address, uint8_t register_address, float output_voltage)
uint8_t register_
float fb_ref = 0;
int8_t nack = 0;
if (register_address == 0x23 | register_address == 0x24)
fb_ref = output_voltage / (1 + LTC3589_RES_BUCK1_RTOP/LTC3589_RES_BUCK1_RBOT);
//Generates desired FB reference input for given output voltage.
return (1 + LTC3589_RES_BUCK1_RTOP/LTC3589_RES_BUCK1_RBOT) * LTC3589_set_buck_fb_ref(i2c_address, register_address, fb_ref);
//Writes new buck output fb refernce.
if (register_address == 0x26 | register_address == 0x27)
fb_ref = output_voltage / (1 + LTC3589_RES_BUCK2_RTOP/LTC3589_RES_BUCK2_RBOT);
//Generates desired FB reference input for given output voltage.
return (1 + LTC3589_RES_BUCK2_RTOP/LTC3589_RES_BUCK2_RBOT) * LTC3589_set_buck_fb_ref(i2c_address, register_address, fb_ref);
//Writes new buck output fb refernce.
if (register_address == 0x29 | register_address == 0x2A)
fb_ref = output_voltage / (1 + LTC3589_RES_BUCK3_RTOP/LTC3589_RES_BUCK3_RBOT);
//Generates desired FB reference input for given output voltage.
return (1 + LTC3589_RES_BUCK3_RTOP/LTC3589_RES_BUCK3_RBOT) * LTC3589_set_buck_fb_ref(i2c_address, register_address, fb_ref);
//Writes new buck output fb refernce.
// Writes the Feedback Reference Voltage of LDO2.
float LTC3589_set_ldo2_fb_ref(uint8_t i2c_address, uint8_t register_address, float fb_ref_voltage)
uint8_t register_
uint8_t fb_ref_data = 0;
int8_t nack = 0;
fb_ref_data = (uint8_t) ((fb_ref_voltage + 6.25 - 362.5) / 12.5);
//Generates 5-bit code for closest allowable value to user's chosen reference voltage.
nack |= LTC3589_register_read(i2c_address, register_address, &register_data); //Read current register value
register_data = register_data & (~LTC3589_FB_REF_MASK); //Clears existing feedback reference bits
register_data = register_data | fb_ref_
nack |= LTC3589_register_write(i2c_address, register_address, register_data);
//Writes new register value
nack |= LTC3589_set_go_bits(i2c_address);
return (362.5 + (fb_ref_data * 12.5));
// Writes the Feedback Reference Voltage of any buck.
float LTC3589_set_buck_fb_ref(uint8_t i2c_address, uint8_t register_address, float fb_ref_voltage)
uint8_t register_
uint8_t fb_ref_data = 0;
int8_t nack = 0;
fb_ref_data = (uint8_t) ((fb_ref_voltage + 6.25 - 362.5) / 12.5);
//Generates 5-bit code for closest allowable value to user's chosen reference voltage.
nack |= LTC3589_register_read(i2c_address, register_address, &register_data); //Read current register value
register_data = register_data & (~LTC3589_FB_REF_MASK); //Clears existing feedback reference bits
register_data = register_data | fb_ref_
nack |= LTC3589_register_write(i2c_address, register_address, register_data);
//Writes new register value
nack |= LTC3589_set_go_bits(i2c_address);
return (362.5 + (fb_ref_data * 12.5));
// Calculates the maximum output voltage of LDO2 in mV based on the feedback resistors.
float LTC3589_ldo2_vout_max()
return ((1 + (LTC3589_RES_LDO2_RTOP/LTC3589_RES_LDO2_RBOT)) * 750);
// Calculates the minimum output voltage of LDO2 mV based on the feedback resistors.
float LTC3589_ldo2_vout_min()
return ((1 + (LTC3589_RES_LDO2_RTOP/LTC3589_RES_LDO2_RBOT)) * 362.5);
// Calculates the maximum output voltage of any buck in mV based on the feedback resistors.
float LTC3589_buck_vout_max(uint8_t buck_number)
switch (buck_number)
return ((1 + (LTC3589_RES_BUCK1_RTOP/LTC3589_RES_BUCK1_RBOT)) * 750);
return ((1 + (LTC3589_RES_BUCK2_RTOP/LTC3589_RES_BUCK2_RBOT)) * 750);
return ((1 + (LTC3589_RES_BUCK3_RTOP/LTC3589_RES_BUCK3_RBOT)) * 750);
// Calculates the minimum output voltage of any buck in mV based on the feedback resistors.
float LTC3589_buck_vout_min(uint8_t buck_number)
switch (buck_number)
return ((1 + LTC3589_RES_BUCK1_RTOP/LTC3589_RES_BUCK1_RBOT) * 362.5);
return ((1 + LTC3589_RES_BUCK2_RTOP/LTC3589_RES_BUCK2_RBOT) * 362.5);
return ((1 + LTC3589_RES_BUCK3_RTOP/LTC3589_RES_BUCK3_RBOT) * 362.5);
// Selects the reference for LDO2.
int8_t LTC3589_select_ldo2_reference(uint8_t i2c_address, int8_t ref_char)
int8_t ack = 0;
if (ref_char == '1')
ack |= LTC3589_bit_clear(i2c_address, LTC3589_REG_VCCR, LTC3589_LDO2_REF_SELECT);
else if (ref_char == '2')
ack |= LTC3589_bit_set(i2c_address, LTC3589_REG_VCCR, LTC3589_LDO2_REF_SELECT);
ack |= LTC3589_set_go_bits(i2c_address);
return(ack);
// Selects the reference for the specified buck regulator(s).
int8_t LTC3589_select_buck_reference(uint8_t i2c_address, uint8_t buck_number, int8_t ref_char)
int8_t ack = 0;
if (buck_number == 0xFF)
ack |= LTC3589_select_buck_reference(i2c_address, 1, ref_char);
ack |= LTC3589_select_buck_reference(i2c_address, 2, ref_char);
ack |= LTC3589_select_buck_reference(i2c_address, 3, ref_char);
return(ack);
if (ref_char == '1')
ack |= LTC3589_bit_clear(i2c_address, LTC3589_REG_VCCR, (buck_number*2)-1);
else if (ref_char == '2')
ack |= LTC3589_bit_set(i2c_address, LTC3589_REG_VCCR, (buck_number*2)-1);
ack |= LTC3589_set_go_bits(i2c_address);
return(ack);
// Sets the switching mode for the specified buck regulator(s).
int8_t LTC3589_set_buck_mode(uint8_t i2c_address, uint8_t buck_number, uint8_t mode)
uint8_t register_
int8_t ack = 0;
if (buck_number == 0xFF)
ack |= LTC3589_set_buck_mode(i2c_address, 0x01, mode);
ack |= LTC3589_set_buck_mode(i2c_address, 0x02, mode);
ack |= LTC3589_set_buck_mode(i2c_address, 0x03, mode);
return(ack);
ack |= LTC3589_register_read(i2c_address, LTC3589_REG_SCR1, &register_data);
//Read register
register_data = register_data & (~LTC3589_BUCK_MODE_MASK(buck_number));
//Clears the Mode bits in the Buck register
register_data = register_data | (mode && ((buck_number*2)-2));
ack |= LTC3589_register_write(i2c_address, LTC3589_REG_SCR1, register_data);
//Writes new register value
return(ack);
// Sets the switching mode for the buck-boost regulator.
int8_t LTC3589_set_buckboost_mode(uint8_t i2c_address, uint8_t mode)
uint8_t register_
int8_t ack = 0;
ack |= LTC3589_bit_write(i2c_address, LTC3589_REG_SCR1, LTC3589_BUCKBOOST_MODE, mode);
//Writes new mode-bit value
return(ack);
// Sets the start-up mode for all regulators.
int8_t LTC3589_set_startup_mode(uint8_t i2c_address, uint8_t startup_bit)
int8_t ack = 0;
ack |= LTC3589_bit_write(LTC3589_I2C_ADDRESS, LTC3589_REG_SCR2, LTC3589_BUCK1_STARTUP, startup_bit);
ack |= LTC3589_bit_write(LTC3589_I2C_ADDRESS, LTC3589_REG_SCR2, LTC3589_BUCK2_STARTUP, startup_bit);
ack |= LTC3589_bit_write(LTC3589_I2C_ADDRESS, LTC3589_REG_SCR2, LTC3589_BUCK3_STARTUP, startup_bit);
ack |= LTC3589_bit_write(LTC3589_I2C_ADDRESS, LTC3589_REG_SCR2, LTC3589_BB_STARTUP, startup_bit);
ack |= LTC3589_bit_write(LTC3589_I2C_ADDRESS, LTC3589_REG_SCR2, LTC3589_LDO2_STARTUP, startup_bit);
ack |= LTC3589_bit_write(LTC3589_I2C_ADDRESS, LTC3589_REG_SCR2, LTC3589_LDO3_STARTUP, startup_bit);
ack |= LTC3589_bit_write(LTC3589_I2C_ADDRESS, LTC3589_REG_SCR2, LTC3589_LDO4_STARTUP, startup_bit);
return(ack);
// Sets the PGOOD mask bit for all bucks and LDO2.
int8_t LTC3589_set_pgood_mask(uint8_t i2c_address, uint8_t pgood_bit)
int8_t ack = 0;
ack |= LTC3589_bit_write(LTC3589_I2C_ADDRESS, LTC3589_REG_B1DTV1, LTC3589_BUCK_PG_MASK, pgood_bit);
ack |= LTC3589_bit_write(LTC3589_I2C_ADDRESS, LTC3589_REG_B2DTV1, LTC3589_BUCK_PG_MASK, pgood_bit);
ack |= LTC3589_bit_write(LTC3589_I2C_ADDRESS, LTC3589_REG_B3DTV1, LTC3589_BUCK_PG_MASK, pgood_bit);
ack |= LTC3589_bit_write(LTC3589_I2C_ADDRESS, LTC3589_REG_L2DTV1, LTC3589_LDO2_PG_MASK, pgood_bit);
return(ack);
// Sets LDO4 output voltage on the LTC3589.
int8_t LTC3589_set_ldo4_voltage(uint8_t i2c_address, uint8_t ldo4_output_voltage_code)
int8_t ack = 0;
uint8_t register_
ack |= LTC3589_register_read(i2c_address, LTC3589_REG_L2DTV2, &register_data);
//Read register
register_data = register_data & (~LTC3589_LDO4_VOLTAGE_MASK);
//Clears the LDO4 Output Voltage bits in the L2DTV2 register
register_data = register_data | (ldo4_output_voltage_code && 5);
ack |= LTC3589_register_write(i2c_address, LTC3589_REG_L2DTV2, register_data);
//Writes new register value
return(ack);
// Sets the dynamic reference slew rate for the regulator(s).
int8_t LTC3589_set_regulator_slew(uint8_t i2c_address, uint8_t regulator_mask, uint8_t slew_rate)
uint8_t register_
uint8_t bit_shift = log(regulator_mask/3) / log(2);
int8_t ack = 0;
if (regulator_mask == 0xFF)
ack |= LTC3589_set_regulator_slew(i2c_address, LTC3589_BUCK1_SLEW_MASK, slew_rate);
ack |= LTC3589_set_regulator_slew(i2c_address, LTC3589_BUCK2_SLEW_MASK, slew_rate);
ack |= LTC3589_set_regulator_slew(i2c_address, LTC3589_BUCK3_SLEW_MASK, slew_rate);
ack |= LTC3589_set_regulator_slew(i2c_address, LTC3589_LDO2_SLEW_MASK, slew_rate);
return(ack);
ack |= LTC3589_register_read(i2c_address, LTC3589_REG_VRRCR, &register_data);
//Read register
register_data = register_data & (~regulator_mask);
//Clears the Mode bits in the Buck register
register_data = register_data | (slew_rate && bit_shift);
ack |= LTC3589_register_write(i2c_address, LTC3589_REG_VRRCR, register_data);
//Writes new register value
return(ack);
// Sets the switch DV/DT control for the buck regulators.
int8_t LTC3589_set_switch_dvdt_control(uint8_t i2c_address, uint8_t dvdt_control_bits)
uint8_t register_
int8_t ack = 0;
ack |= LTC3589_register_read(i2c_address, LTC3589_REG_B1DTV1, &register_data);
register_data = register_data & (~LTC3589_BUCK_DVDT_MASK);
register_data = register_data | (dvdt_control_bits && 6);
ack |= LTC3589_register_write(i2c_address, LTC3589_REG_B1DTV1, register_data);
return(ack);
// Sets all four GO bits in the VCCR register.
int8_t LTC3589_set_go_bits(uint8_t i2c_address)
int8_t ack = 0;
ack |= LTC3589_bit_set(i2c_address, LTC3589_REG_VCCR, LTC3589_BUCK1_GO);
ack |= LTC3589_bit_set(i2c_address, LTC3589_REG_VCCR, LTC3589_BUCK2_GO);
ack |= LTC3589_bit_set(i2c_address, LTC3589_REG_VCCR, LTC3589_BUCK3_GO);
ack |= LTC3589_bit_set(i2c_address, LTC3589_REG_VCCR, LTC3589_LDO2_GO);
return(ack);
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