Create a single-cell battery charging solution with MP2639B and PIC18F57Q43

Switch-mode battery charging management for a Li-ion and Li-Polymer battery

Charger 27 Click with Curiosity Nano with PIC18F57Q43

Published Feb 13, 2024

Click board™

Charger 27 Click

Dev Board

Curiosity Nano with PIC18F57Q43

Compiler

NECTO Studio

MCU

PIC18F57Q43

Power up your portable devices with an advanced single-cell Li-Ion or Li-Polymer switching charger, designed for a wide input range and on-the-go applications

Hardware Overview

How does it work?

Charger 27 Click is based on the MP2639B, a Li-Ion or Li-Polymer switching charger from MPS. The charger works in three modes: charge, discharge, and sleep mode. It operates as a switching charger if the input power supply is available. The charger automatically detects the battery voltage and charges the battery in three phases: pre-charge, constant charge, and constant voltage charge. Other features include charge termination and auto-recharge. When the input is absent, the charger can provide a boost voltage to the VIN terminal, the same which is used for the input voltage power supply. This Click board™ uses a

general-purpose I/O to allow the host MCU to control the MP2639B charger. Besides the push button, you can also select charge mode by pulling the MD pin to a LOW logic state and discharge mode by pulling this pin to a HIGH logic state. The charger uses the CHG pin to indicate the host MCU of the charge status and the AOK pin to indicate the valid input supply. There are several LEDs on the Charger 27 Click. LEDs labeled 1 – 4 represent a fuel gauge. The charge completion indicator is available over the CHG LED, and the valid input supply indicator is available over the AOK LED. The discharge function is enabled by pressing the

onboard button for less than 2.5 seconds. If the discharge is enabled, you can turn off this feature by pressing the button longer than 2.5 seconds. You can also set the charge current between 1A and 2A over the ISET SEL jumper. 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.

Charger 27 Click hardware overview image

Features overview

Development board

PIC18F57Q43 Curiosity Nano evaluation kit is a cutting-edge hardware platform designed to evaluate microcontrollers within the PIC18-Q43 family. Central to its design is the inclusion of the powerful PIC18F57Q43 microcontroller (MCU), offering advanced functionalities and robust performance. Key features of this evaluation kit include a yellow user LED and a responsive

mechanical user switch, providing seamless interaction and testing. The provision for a 32.768kHz crystal footprint ensures precision timing capabilities. With an onboard debugger boasting a green power and status LED, programming and debugging become intuitive and efficient. Further enhancing its utility is the Virtual serial port (CDC) and a debug GPIO channel (DGI

GPIO), offering extensive connectivity options. Powered via USB, this kit boasts an adjustable target voltage feature facilitated by the MIC5353 LDO regulator, ensuring stable operation with an output voltage ranging from 1.8V to 5.1V, with a maximum output current of 500mA, subject to ambient temperature and voltage constraints.

PIC18F57Q43 Curiosity Nano double side image

Microcontroller Overview

MCU Card / MCU

Architecture

PIC

MCU Memory (KB)

128

Silicon Vendor

Microchip

Pin count

RAM (Bytes)

8196

You complete me!

Accessories

Curiosity Nano Base for Click boards is a versatile hardware extension platform created to streamline the integration between Curiosity Nano kits and extension boards, tailored explicitly for the mikroBUS™-standardized Click boards and Xplained Pro extension boards. This innovative base board (shield) offers seamless connectivity and expansion possibilities, simplifying experimentation and development. Key features include USB power compatibility from the Curiosity Nano kit, alongside an alternative external power input option for enhanced flexibility. The onboard Li-Ion/LiPo charger and management circuit ensure smooth operation for battery-powered applications, simplifying usage and management. Moreover, the base incorporates a fixed 3.3V PSU dedicated to target and mikroBUS™ power rails, alongside a fixed 5.0V boost converter catering to 5V power rails of mikroBUS™ sockets, providing stable power delivery for various connected devices.

Li-Polymer Battery is the ideal solution for devices that demand a dependable and long-lasting power supply while emphasizing mobility. Its compatibility with mikromedia boards ensures easy integration without additional modifications. With a voltage output of 3.7V, the battery meets the standard requirements of many electronic devices. Additionally, boasting a capacity of 2000mAh, it can store a substantial amount of energy, providing sustained power for extended periods. This feature minimizes the need for frequent recharging or replacement. Overall, the Li-Polymer Battery is a reliable and autonomous power source, ideally suited for devices requiring a stable and enduring energy solution. You can find a more extensive choice of Li-Polymer batteries in our offer.

Used MCU Pins

mikroBUS™ mapper

Input Supply Indicator

PA0

RST

ID COMM

PD4

SCK

MISO

MOSI

Power Supply

3.3V

Ground

GND

Mode Selection

PB0

PWM

Charge Indication

PA6

INT

SCL

SDA

Power Supply

Ground

GND

Take a closer look

Click board™ Schematic

Step by step

Project assembly

Curiosity Nano Base for Click boards front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Curiosity Nano with PIC18F57Q43 as your development board.

Charger 27 Click front image hardware assembly

PIC18F47Q10 Curiosity Nano front image hardware assembly

Charger 27 Click complete accessories setup image hardware assembly

Curiosity Nano with PICXXX Access MB 1 - upright/background hardware assembly

PIC18F57Q43 Curiosity MCU Step hardware assembly

Necto No Display image step 8 hardware assembly

Debug Image Necto Step hardware assembly

Track your results in real time

Application Output

This Click board can be interfaced and monitored in two ways:

Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.

UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Software Support

Library Description

This library contains API for Charger 27 Click driver.

Key functions:

charger27_set_mode - This function is used for the charge or discharge mode selection
charger27_check_chg_completion - This function checks the charging completion indicator state
charger27_check_input_supply - This function checks valid input supply indicator state

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 Charger 27 Click Example.
 *
 * # Description
 * This example demonstrates the use of the Charger 27 click board 
 * by enabling charge or discharge mode and 
 * indicating valid input supply and charging completion.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initialization of GPIO module and log UART.
 * After driver initialization, the app sets charge mode.
 *
 * ## Application Task
 * The Charger 27 click board operates as a switching charger to charge a 1S battery 
 * from a wide input power range of 5V to 16V, which can cover a USB PD voltage level.
 * The demo application checks and displays the charging completion indicator status.
 * Results are being sent to the UART Terminal, where you can track their changes.
 *
 * @author Nenad Filipovic
 *
 */

#include "board.h"
#include "log.h"
#include "charger27.h"

static charger27_t charger27;   /**< Charger 27 Click driver object. */
static log_t logger;    /**< Logger object. */

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    charger27_cfg_t charger27_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.
    charger27_cfg_setup( &charger27_cfg );
    CHARGER27_MAP_MIKROBUS( charger27_cfg, MIKROBUS_1 );
    if ( DIGITAL_OUT_UNSUPPORTED_PIN == charger27_init( &charger27, &charger27_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( CHARGER27_OK == charger27_set_mode( &charger27, CHARGER27_MODE_CHARGE ) )
    {
        log_printf( &logger, " > Charge mode <\r\n" );
        Delay_ms( 100 );
    }
}

void application_task ( void ) 
{
    if ( CHARGER27_CHG_CHARGE == charger27_check_chg_completion( &charger27 ) )
    {
        log_printf( &logger, " Charging.\r\n" );
        Delay_ms( 1000 );
    }
    else
    {
        log_printf( &logger, " Charging has completed or is suspended.\r\n" );
        Delay_ms( 1000 );
    }
}

void main ( void ) 
{
    application_init( );

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

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