Allow your devices to operate seamlessly with the right voltage using LTS3562 and STM32G071RB
Power your world with our high-performance buck converter!
Published Oct 08, 2024
Click board™
Smart Buck 4 Click
Dev. board
Nucleo 64 with STM32G071RB MCU
Compiler
NECTO Studio
MCU
STM32G071RB
Our buck converters are the wizards of smart voltage regulation, bringing sharp performance to your electronic landscape. Experience the power of innovation with a solution designed to meet the dynamic demands of modern technology.
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Hardware Overview
How does it work?
Smart Buck 4 Click is based on the LTS3562, a quad synchronous step-down DC-DC regulator from Analog Devices. The LTS3562 has four independent I2C controllable step-down regulators, two of them with an output current of up to 600mA and two with an output current of up to 400mA. The Type A regulators are externally adjustable and have a programmable feedback voltage of 425mV up to 800mV (R600A, R400A) in 25mV steps. The Type B regulators have a fixed output, and their output voltages can be programmed between 600mV and 3.755V (R600B, R400B) in 25mV steps. The R600A regulator has a Power-on-reset output feature. Both Type A and Type B have separate RUN pins that can be enabled if I2C control is unavailable. The
LTS3562 has several programmable modes in which all four regulators can operate. In Pulse skip mode, an internal latch is set at the start of every 2.25MHz cycle, which turns the main P-channel MOSFET on. In LDO mode, the switching regulators are converted to linear regulators, thus delivering continuous power. This mode gives the LTS3562 a DC option and the lowest possible output noise. In Burst mode, the switching regulator automatically switches between the hysterical control and a fixed-frequency pulse skip operation. The first is automatically switched at light loads, while the latter is switched at heavy loads. In Forced Burst mode, the switching regulators use a constant-current algorithm to control the inductor current, and in this mode, the
output power is limited. The Smart Buck 4 Click uses a standard 2-Wire I2C interface to communicate with the host MCU, supporting speeds up to 400KHz. The LTS3562 is a receive-only device, and the I2C address is fixed and can not be changed. As mentioned, you can manage Type A and Type B regulators with active LOW by a host MCU over the R40 and R60 pins. This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, it comes equipped with a library containing functions and an example code that can be used as a reference for further development.
Features overview
Development board
Nucleo-64 with STM32G071RB MCU offers a cost-effective and adaptable platform for developers to explore new ideas and prototype their designs. This board harnesses the versatility of the STM32 microcontroller, enabling users to select the optimal balance of performance and power consumption for their projects. It accommodates the STM32 microcontroller in the LQFP64 package and includes essential components such as a user LED, which doubles as an ARDUINO® signal, alongside user and reset push-buttons, and a 32.768kHz crystal oscillator for precise timing operations. Designed with expansion and flexibility in mind, the Nucleo-64 board features an ARDUINO® Uno V3 expansion connector and ST morpho extension pin
headers, granting complete access to the STM32's I/Os for comprehensive project integration. Power supply options are adaptable, supporting ST-LINK USB VBUS or external power sources, ensuring adaptability in various development environments. The board also has an on-board ST-LINK debugger/programmer with USB re-enumeration capability, simplifying the programming and debugging process. Moreover, the board is designed to simplify advanced development with its external SMPS for efficient Vcore logic supply, support for USB Device full speed or USB SNK/UFP full speed, and built-in cryptographic features, enhancing both the power efficiency and security of projects. Additional connectivity is
provided through dedicated connectors for external SMPS experimentation, a USB connector for the ST-LINK, and a MIPI® debug connector, expanding the possibilities for hardware interfacing and experimentation. Developers will find extensive support through comprehensive free software libraries and examples, courtesy of the STM32Cube MCU Package. This, combined with compatibility with a wide array of Integrated Development Environments (IDEs), including IAR Embedded Workbench®, MDK-ARM, and STM32CubeIDE, ensures a smooth and efficient development experience, allowing users to fully leverage the capabilities of the Nucleo-64 board in their projects.
Microcontroller Overview
MCU Card / MCU
Architecture
ARM Cortex-M0
MCU Memory (KB)
128
Silicon Vendor
STMicroelectronics
Pin count
64
RAM (Bytes)
36864
You complete me!
Accessories
Click Shield for Nucleo-64 comes equipped with two proprietary mikroBUS™ sockets, allowing all the Click board™ devices to be interfaced with the STM32 Nucleo-64 board with no effort. This way, Mikroe allows its users to add any functionality from our ever-growing range of Click boards™, such as WiFi, GSM, GPS, Bluetooth, ZigBee, environmental sensors, LEDs, speech recognition, motor control, movement sensors, and many more. More than 1537 Click boards™, which can be stacked and integrated, are at your disposal. The STM32 Nucleo-64 boards are based on the microcontrollers in 64-pin packages, a 32-bit MCU with an ARM Cortex M4 processor operating at 84MHz, 512Kb Flash, and 96KB SRAM, divided into two regions where the top section represents the ST-Link/V2 debugger and programmer while the bottom section of the board is an actual development board. These boards are controlled and powered conveniently through a USB connection to program and efficiently debug the Nucleo-64 board out of the box, with an additional USB cable connected to the USB mini port on the board. Most of the STM32 microcontroller pins are brought to the IO pins on the left and right edge of the board, which are then connected to two existing mikroBUS™ sockets. This Click Shield also has several switches that perform functions such as selecting the logic levels of analog signals on mikroBUS™ sockets and selecting logic voltage levels of the mikroBUS™ sockets themselves. Besides, the user is offered the possibility of using any Click board™ with the help of existing bidirectional level-shifting voltage translators, regardless of whether the Click board™ operates at a 3.3V or 5V logic voltage level. Once you connect the STM32 Nucleo-64 board with our Click Shield for Nucleo-64, you can access hundreds of Click boards™, working with 3.3V or 5V logic voltage levels.
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Click board™ Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the Nucleo 64 with STM32G071RB MCU as your development board.
Software Support
Library Description
This library contains API for Smart Buck 4 Click driver.
Key functions:
smartbuck4_en_r40_reg- Smart Buck 4 enable 400A regulator function.smartbuck4_send_command- Smart Buck 4 send command function.smartbuck4_disable_regulators- Smart Buck 4 disable regulators function.
Open Source
Code example
The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.
/*!
* @file main.c
* @brief Smart Buck 4 Click example
*
* # Description
* This example demonstrates the use of the Smart Buck 4 Click board.
* This driver provides functions for device configurations
* and for the setting of the output voltage.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initialization of I2C module and log UART.
* After initializing the driver, the default configuration is executed
* and the outputs are turned off.
*
* ## Application Task
* Changes the output voltage every 5 seconds, starting from 0.6 V to 3.3V/3.7V
* depending on the input voltage.
*
* @author Stefan Ilic
*
*/
#include "board.h"
#include "log.h"
#include "smartbuck4.h"
static smartbuck4_t smartbuck4;
static log_t logger;
#define SMARTBUCK4_MIN_VOLTAGE 600
#define SMARTBUCK4_STEP 25
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
smartbuck4_cfg_t smartbuck4_cfg; /**< Click config object. */
/**
* Logger initialization.
* Default baud rate: 115200
* Default log level: LOG_LEVEL_DEBUG
* @note If USB_UART_RX and USB_UART_TX
* are defined as HAL_PIN_NC, you will
* need to define them manually for log to work.
* See @b LOG_MAP_USB_UART macro definition for detailed explanation.
*/
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, " Application Init " );
// Click initialization.
smartbuck4_cfg_setup( &smartbuck4_cfg );
SMARTBUCK4_MAP_MIKROBUS( smartbuck4_cfg, MIKROBUS_1 );
if ( I2C_MASTER_ERROR == smartbuck4_init( &smartbuck4, &smartbuck4_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
if ( SMARTBUCK4_ERROR == smartbuck4_default_cfg ( &smartbuck4 ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
for ( uint8_t n_cnt = SMARTBUCK4_REGULATOR_B_600_MV;
n_cnt <= SMARTBUCK4_REGULATOR_B_3700_MV;
n_cnt += SMARTBUCK4_REGULATOR_B_700_MV )
{
err_t error_flag = smartbuck4_send_command( &smartbuck4, SMARTBUCK4_REG_R600B_PROGRAM |
SMARTBUCK4_REG_R400B_PROGRAM |
SMARTBUCK4_REG_LDO_MODE,
SMARTBUCK4_ENABLE_REGULATOR | n_cnt );
if ( SMARTBUCK4_OK == error_flag )
{
log_printf( &logger, " Set output to %d mV. \r\n",
( SMARTBUCK4_MIN_VOLTAGE + n_cnt * SMARTBUCK4_STEP ) );
}
else
{
log_error( &logger, " Transmission error occurred." );
smartbuck4_disable_regulators( &smartbuck4 );
for ( ; ; );
}
Delay_ms ( 1000 );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
}
}
int main ( void )
{
/* Do not remove this line or clock might not be set correctly. */
#ifdef PREINIT_SUPPORTED
preinit();
#endif
application_init( );
for ( ; ; )
{
application_task( );
}
return 0;
}
// ------------------------------------------------------------------------ END
Additional Support
Resources
Category:Buck
