Charger 27 Click

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.

Specifications

Pinout diagram

This table shows how the pinout on Charger 27 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Input Supply Indicator	AOK	1	AN	PWM	16	MD	Mode Selection
	NC	2	RST	INT	15	CHG	Charge Indication
ID COMM	CS	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	NC
	NC	6	MOSI	SDA	11	NC
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Charger 27 Click electrical specifications

Software Support

We provide a library for the Charger 27 Click as well as a demo application (example), developed using MIKROE compilers. The demo can run on all the main MIKROE development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe github account.

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.

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.

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

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Charger27

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MIKROE compilers.

mikroSDK

This Click board™ is supported with mikroSDK – MIKROE Software Development Kit. To ensure proper operation of mikroSDK compliant Click board5 demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.

For more information about mikroSDK, visit the official page.