Intermediate
30 min

Unleash the voltage step-down wizardry with MP2316 and PIC32MZ1024EFH064

Ride the wave of efficiency

Buck 20 Click with PIC32MZ clicker

Published Aug 01, 2023

Click board™

Buck 20 Click

Dev Board

PIC32MZ clicker

Compiler

NECTO Studio

MCU

PIC32MZ1024EFH064

By ensuring precise voltage regulation, this buck converter enhances the reliability and longevity of electronic systems, reducing the risk of voltage-related failures

A

A

Hardware Overview

How does it work?

Buck 20 Click is based on the MP2316, a fully-integrated, synchronous, rectified, step-down switch converter from Monolithic Power Systems (MPS). The MP2316 uses constant-on-time (COT) control to provide a fast transient response and easy loop compensation. It achieves 3A continuous output current over a wide input supply range and has excellent load and line regulation. In addition, it is characterized by high efficiency over a wide range of load output voltage, which can be easily adjusted using a digital potentiometer, the AD5235 from Analog Devices. This Click board™ is suitable for battery-operated applications offering advanced protection features such

as undervoltage, overcurrent, short-circuit detection, and thermal shutdown. Thanks to the AD5235 digital potentiometer, this Click board™ can select a decreased output voltage in the range from 1.3V to 5V, with the appropriate command sent via the SPI serial interface. Also, the AD5235 uses a ready RDY pin, routed to the INT pin of the mikroBUS™ socket, for its instruction completion indication. In addition to the SPI interface, the Buck 20 Click also has a device-enable feature, routed to the RST pin of the mikroBUS™ socket, for power ON/OFF purposes optimizing power consumption (converter operation permission). This Click board™ can operate with both 3.3V and

5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V MCUs can use the communication lines correctly. Additionally, there is a possibility for the MP2316 power supply selection via jumper labeled as VIN SEL to supply the MP2316 from an external power supply terminal in the range from 4V to 19V or with mikroBUS™ power rails. However, the 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.

Buck 20 Click hardware overview image

Features overview

Development board

PIC32MZ 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 PIC32MZ microcontroller with FPU from Microchip, 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 PIC32MZ Clicker development kit contains the components necessary for the most efficient operation of the same board. In addition to the possibility of choosing the PIC32MZ Clicker programming method, using USB HID mikroBootloader, or through an external mikroProg connector for PIC, dsPIC, or PIC32 programmer, the Clicker board also includes a clean and regulated power supply module for the development kit. The USB Micro-B connection can provide 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. PIC32MZ 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.

PIC32MZ clicker double side image

Microcontroller Overview

MCU Card / MCU

default

Architecture

PIC32

MCU Memory (KB)

1024

Silicon Vendor

Microchip

Pin count

64

RAM (Bytes)

524288

Used MCU Pins

mikroBUS™ mapper

NC
NC
AN
MP2316 Enable
RE5
RST
SPI Chip Select
RG9
CS
SPI Clock
RG6
SCK
SPI Data OUT
RG7
MISO
SPI Data IN
RG8
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
NC
NC
PWM
NC
NC
INT
NC
NC
TX
NC
NC
RX
NC
NC
SCL
NC
NC
SDA
Power Supply
5V
5V
Ground
GND
GND
1

Take a closer look

Schematic

Buck 20 Click Schematic schematic

Step by step

Project assembly

PIC32MZ clicker front image hardware assembly

Start by selecting your development board and Click board™. Begin with the PIC32MZ clicker as your development board.

PIC32MZ clicker front image hardware assembly
GNSS2 Click front image hardware assembly
Prog-cut hardware assembly
GNSS2 Click complete accessories setup image hardware assembly
Micro B Connector Clicker Access - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
Necto image step 5 hardware assembly
Necto image step 6 hardware assembly
Flip&Click PIC32MZ MCU step hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Debug Image Necto Step hardware assembly

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.

Application Output Step 1

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™.

Application Output Step 3

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.

Application Output Step 4

Software Support

Library Description

This library contains API for Buck 20 Click driver.

Key functions:

  • buck20_set_wiper_1 - This function sets wiper 1 to desired value

  • buck20_enable_device - This function enables the buck device by setting the RST pin to high logic state

  • buck20_disable_device - This function disables the buck device by setting the RST pin to low logic state

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 Buck 20 Click example
 *
 * # Description
 * This example demonstrates the use of Buck 20 click by changing the output voltage.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initializes the driver and enables the device.
 *
 * ## Application Task
 * Changes the output voltage every 3 seconds and displays on the USB UART the digipot
 * wiper position, as well as an approximate buck R1 and voltage output.
 * 
 * @note
 * An approximate buck R1 and VOUT values do not have to be 100% accurate for all wiper settings
 * but they are a good reference point. VOUT ranges from ~1.3V to ~5V, and it is the most accurate
 * around 3.3V since all passive components are set for that output.
 * 
 * @author Stefan Filipovic
 *
 */

#include "board.h"
#include "log.h"
#include "buck20.h"

static buck20_t buck20;
static log_t logger;

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    buck20_cfg_t buck20_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.
    buck20_cfg_setup( &buck20_cfg );
    BUCK20_MAP_MIKROBUS( buck20_cfg, MIKROBUS_1 );
    if ( SPI_MASTER_ERROR == buck20_init( &buck20, &buck20_cfg ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    buck20_set_wiper_1 ( &buck20, BUCK20_WIPER_ZERO_SCALE );
    buck20_enable_device ( &buck20 );
    log_info( &logger, " Application Task " );
}

void application_task ( void )
{
    static uint16_t digipot_wiper = BUCK20_WIPER_ZERO_SCALE;
    float buck_r1_kohm, buck_vout;
    if ( BUCK20_OK == buck20_set_wiper_1 ( &buck20, digipot_wiper ) )
    {
        buck_r1_kohm = BUCK20_RESISTOR_R6_KOHM + 
                       ( float ) ( BUCK20_DIGIPOT_MAX_KOHM * digipot_wiper ) / BUCK20_WIPER_FULL_SCALE;
        buck_vout = BUCK20_BUCK_VREF + ( buck_r1_kohm * BUCK20_BUCK_VREF ) / BUCK20_BUCK_R2_KOHM;
        log_printf( &logger, " Digipot wiper position: %u\r\n", digipot_wiper );
        log_printf( &logger, " Approximate R1 (Digipot+R6): %.2f kOhm\r\n", buck_r1_kohm );
        log_printf( &logger, " Approximate buck voltage output: %.2f V\r\n\n", buck_vout );
        digipot_wiper += 50;
        if ( digipot_wiper > BUCK20_WIPER_FULL_SCALE )
        {
            digipot_wiper = BUCK20_WIPER_ZERO_SCALE;
        }
    }
    Delay_ms ( 3000 );
}

void main ( void )
{
    application_init( );

    for ( ; ; )
    {
        application_task( );
    }
}

// ------------------------------------------------------------------------ END

Additional Support

Resources