Convert a higher input voltage to a lower output easily with TPS628510 and MK22FN512VLH12
Synchronous step-down supremacy!
Published Aug 01, 2023
Click board™
Step Down 5 Click
Dev Board
Kinetis Clicker
Compiler
NECTO Studio
MCU
MK22FN512VLH12
Unlocking the full potential of modern electronics, our step-down converter harmonizes power requirements, paving the way for energy-conscious innovations
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Hardware Overview
How does it work?
Step Down 5 Click is based on the TPS628510, a synchronous step-down converter from Texas Instruments, providing interface-configurable output voltage range from 0.6V to 5.5V suitable for point-of-load and post-regulation applications. This synchronous switch mode power converter is based on a peak current mode control topology and achieves fast and stable operation with an internally compensated control loop. It provides up to 0.5A load current over a wide input supply range from 2.7V to 6V and has excellent load and line regulation. In addition, it is characterized by high efficiency over a wide range of load output voltage from 0.6V to 5.5V, which can be easily adjusted using a digital potentiometer, the MCP4661 from Microchip. The TPS628510 supports
forced fixed frequency PWM operation with the MD pin of the mikroBUS™ socket set to a high logic level. Its switching frequency is internally fixed at 2.25MHz. When the MD pin is set to a low logic level, the TPS628510 operates in power save mode (PFM) at a low output current and automatically transfers to fixed-frequency PWM mode at a higher output current. In PFM mode, the switching frequency decreases linearly based on the load to sustain high efficiency down to a very low output current. Alternatively, the TPS628510 can be synchronized to an external clock signal from 1.8MHz to 4MHz, applied to the MD pin. An internal PLL allows you to change from an internal clock to an external clock during operation. Besides the operational mode
selection pin, this Click board™ also has a power-good function routed to the PG pin of the mikroBUS™ socket, indicating that the output reached desired regulation and the possibility for the MCP4661 to choose the least significant bit (LSB) of its I2C slave address by positioning SMD jumpers labeled as ADDR SEL to an appropriate position marked as 0 and 1. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.
Features overview
Development board
Kinetis Clicker is a compact starter development board that brings the flexibility of add-on Click boards™ to your favorite microcontroller, making it a perfect starter kit for implementing your ideas. It comes with an onboard 32-bit ARM Cortex-M4 microcontroller, the MK22FN512VLH12 from NXP Semiconductor, a USB connector, LED indicators, buttons, a mikroProg connector, and a header for interfacing with external electronics. Thanks to its compact design with clear and easy-recognizable silkscreen markings, it provides a fluid and immersive working experience, allowing access
anywhere and under any circumstances. Each part of the Kinetis Clicker development kit contains the components necessary for the most efficient operation of the same board. In addition to the possibility of choosing the Kinetis Clicker programming method, using USB HID mikroBootloader, or through an external mikroProg connector for Kinetis programmer, the Clicker board also includes a clean and regulated power supply module for the development kit. The USB-MiniAB connection provides up to 500mA of current, which is more than enough to operate all
onboard and additional modules. All communication methods that mikroBUS™ itself supports are on this board, including the well-established mikroBUS™ socket, reset button, and several buttons and LED indicators. Kinetis Clicker is an integral part of the Mikroe ecosystem, allowing you to create a new application in minutes. Natively supported by Mikroe software tools, it covers many aspects of prototyping thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.
Microcontroller Overview
MCU Card / MCU
Architecture
ARM Cortex-M4
MCU Memory (KB)
512
Silicon Vendor
NXP
Pin count
64
RAM (Bytes)
131072
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the Kinetis Clicker as your development board.
Track your results in real time
Application Output
After loading the code example, pressing the "DEBUG" button builds and programs it on the selected setup.
After programming is completed, a header with buttons for various actions available in the IDE appears. By clicking the green "PLAY "button, we start reading the results achieved with Click board™.
Upon completion of programming, the Application Output tab is automatically opened, where the achieved result can be read. In case of an inability to perform the Debug function, check if a proper connection between the MCU used by the setup and the CODEGRIP programmer has been established. A detailed explanation of the CODEGRIP-board connection can be found in the CODEGRIP User Manual. Please find it in the RESOURCES section.
Software Support
Library Description
This library contains API for Step Down 5 Click driver.
Key functions:
stepdown5_set_wiper_0_pos- Step Down 5 set wiper 0 positionstepdown5_set_r1_resistance- Step Down 5 set potentiometer 0 resistancestepdown5_set_output- Step Down 5 set output voltage
Open Source
Code example
This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.
/*!
* @file main.c
* @brief Step Down 5 Click example
*
* # Description
* This library contains API for the Step Down 5 Click driver.
* This driver provides the functions to set the output voltage treshold.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initialization of I2C module and log UART.
* After driver initialization, default settings sets output voltage to 0.6 V.
*
* ## Application Task
* This example demonstrates the use of the Step Down 5 Click board™ by changing
* output voltage every 5 seconds starting from 0.6 V up to 3.3 V.
*
*
* @author Stefan Ilic
*
*/
#include "board.h"
#include "log.h"
#include "stepdown5.h"
static stepdown5_t stepdown5;
static log_t logger;
/**
* @brief Output level printing function.
* @details This function is used to log value of the selected voltage to UART terminal.
* @param[in] sel_level : Selected voltage level.
* @return Nothing.
* @note None.
*/
static void print_selected_output_level ( uint8_t sel_level );
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
stepdown5_cfg_t stepdown5_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.
stepdown5_cfg_setup( &stepdown5_cfg );
STEPDOWN5_MAP_MIKROBUS( stepdown5_cfg, MIKROBUS_1 );
if ( I2C_MASTER_ERROR == stepdown5_init( &stepdown5, &stepdown5_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
if ( STEPDOWN5_ERROR == stepdown5_default_cfg ( &stepdown5 ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
for ( uint8_t n_cnt = STEPDOWN5_OUTPUT_0V6; n_cnt <= STEPDOWN5_OUTPUT_3V3; n_cnt++ )
{
stepdown5_set_output( &stepdown5, n_cnt );
log_printf( &logger, " Selected output is:" );
print_selected_output_level ( n_cnt );
Delay_ms( 5000 );
}
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
static void print_selected_output_level ( uint8_t sel_level )
{
switch ( sel_level )
{
case ( STEPDOWN5_OUTPUT_0V6 ):
{
log_printf( &logger, " 0.6V\r\n" );
break;
}
case ( STEPDOWN5_OUTPUT_1V5 ):
{
log_printf( &logger, " 1.5V\r\n" );
break;
}
case ( STEPDOWN5_OUTPUT_2V5 ):
{
log_printf( &logger, " 2.5V\r\n" );
break;
}
case ( STEPDOWN5_OUTPUT_3V3 ):
{
log_printf( &logger, " 3.3V\r\n" );
break;
}
default:
{
log_printf( &logger, " ERROR\r\n" );
}
}
}
// ------------------------------------------------------------------------ END
