Maintain power continuity and ensure optimal performance with TPS2115A and PIC32MZ2048EFM100
Continuous power, Zero hassle: Experience seamless transition with us
Published Oct 10, 2023
Click board™
Power MUX Click
Dev Board
Curiosity PIC32 MZ EF
Compiler
NECTO Studio
MCU
PIC32MZ2048EFM100
Our power multiplexer is engineered to revolutionize the way your systems manage power, seamlessly transitioning between dual power sources for uninterrupted operation, even in the face of unexpected failures
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Hardware Overview
How does it work?
Power MUX Click is based on the TPS2115A, an auto-switching power multiplexer that enables transition between two power supplies, each operating at 2.8V to 5.5V voltage that comes from Texas Instruments. This Click board™ has two power switch inputs: primary and secondary. The IN1 switch can be enabled only if the IN1 supply is above the UVLO (under-voltage lockout) threshold, at least one supply exceeds the internal VDD UVLO, while the IN2 switch is enabled when the IN2 supply is above the UVLO threshold, and at least one supply exceeds the internal VDD UVLO. In auto-switching mode, pin D0 equals logic 1, and D1 pin equals logic 0, which means that this circuit will connect IN1 to OUT until the voltage at IN1 falls below a user-specified value. Once the voltage on IN1 falls below this value, the TPS2115A will select the higher of the two supplies. This usually means that the TPS2115A will swap to IN2. In manual
switching mode, pin D0 equals logic 0, and the multiplexer selects between two power supplies based on the D1 logic signal. OUT connects to IN1 if D1 is logic 1; otherwise, OUT connects to IN2. The logic thresholds for the D1 terminal are compatible with both TTL and CMOS logic. There is also interrupt pin STAT that is Hi-Z if the IN2 switch is ON, while STAT goes low if the IN1 switch is ON or OUT is Hi-Z. The under-voltage lockout circuit causes the output OUT to go Hi-Z if the selected power supply does not exceed the IN1/IN2 UVLO or if neither of the supplies exceeds the internal VDD UVLO. The switching circuitry ensures that both power switches will never conduct simultaneously. A comparator monitors the gate-to-source voltage of each power FET and allows an FET to turn ON only if the gate-to-source voltage of the other FET is below the turn-on threshold voltage. When the TPS2115A switches from a higher voltage supply
to a lower voltage supply, current can flow back from the load capacitor into the lower voltage supply. To minimize such reverse conduction, the TPS2115A will only connect a supply to the output once the output voltage has fallen to within 100 mV of the supply voltage. Once the supply has been connected to the output, it will remain connected regardless of the output voltage. This ensures the reliable operation of the IC and the Click board™ itself. Power MUX Click does not use the power from the mikroBUS™ power rails, except 3.3V for the LED indicator and interrupt‘s pull-up resistor. More information about the TPS2115A can be found in the attached datasheet. 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
Curiosity PIC32 MZ EF development board is a fully integrated 32-bit development platform featuring the high-performance PIC32MZ EF Series (PIC32MZ2048EFM) that has a 2MB Flash, 512KB RAM, integrated FPU, Crypto accelerator, and excellent connectivity options. It includes an integrated programmer and debugger, requiring no additional hardware. Users can expand
functionality through MIKROE mikroBUS™ Click™ adapter boards, add Ethernet connectivity with the Microchip PHY daughter board, add WiFi connectivity capability using the Microchip expansions boards, and add audio input and output capability with Microchip audio daughter boards. These boards are fully integrated into PIC32’s powerful software framework, MPLAB Harmony,
which provides a flexible and modular interface to application development a rich set of inter-operable software stacks (TCP-IP, USB), and easy-to-use features. The Curiosity PIC32 MZ EF development board offers expansion capabilities making it an excellent choice for a rapid prototyping board in Connectivity, IOT, and general-purpose applications.
Microcontroller Overview
MCU Card / MCU
Architecture
PIC32
MCU Memory (KB)
2048
Silicon Vendor
Microchip
Pin count
100
RAM (Bytes)
524288
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 Curiosity PIC32 MZ EF 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 Power MUX Click driver.
Key functions:
powermux_int_pin_read- Power MUX pin reading functionpowermux_set_mode- Power MUX mode set function
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 Power MUX Click Example.
*
* # Description
* This Click features power multiplexer that enables transition between two power supplies,
* each operating at 2.8V to 5.5V and delivering up to 2A current depending on the package.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Enables GPIO and starts write log.
*
* ## Application Task
* Changes power inputs every 3 seconds and displays the currently set mode on the USB UART.
*
* @author Mikroe Team
*
*/
#include "board.h"
#include "log.h"
#include "powermux.h"
static powermux_t powermux; /**< Power MUX Click driver object. */
static log_t logger; /**< Logger object. */
void application_init ( void )
{
log_cfg_t log_cfg;
powermux_cfg_t powermux_cfg;
/**
* 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.
powermux_cfg_setup( &powermux_cfg );
POWERMUX_MAP_MIKROBUS( powermux_cfg, MIKROBUS_1 );
if ( DIGITAL_OUT_UNSUPPORTED_PIN == powermux_init( &powermux, &powermux_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
powermux_default_cfg ( &powermux );
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
log_printf( &logger, " OUTPUT : IN1\r\n\n" );
powermux_set_mode( &powermux, POWERMUX_INPUT_CHANNEL_1_ON );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
log_printf( &logger, " OUTPUT : IN2\r\n\n" );
powermux_set_mode( &powermux, POWERMUX_INPUT_CHANNEL_2_ON );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
log_printf( &logger, " OUTPUT : OFF\r\n\n" );
powermux_set_mode( &powermux, POWERMUX_INPUT_CHANNEL_OFF );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
log_printf( &logger, " OUTPUT : AUTO\r\n\n" );
powermux_set_mode( &powermux, POWERMUX_INPUT_CHANNEL_AUTO );
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
