MCP73213 click

MCP73213 click carries the MCP73213 dual-cell Li-Ion/Li-Polymer battery charge management controller with input overvoltage protection from Microchip. The click is designed to run on either 3.3V or 5V power supply. It communicates with the target microcontroller over SPI.

MCP73213 controller features

The MCP73213 is a highly integrated Li-Ion battery charge management controller.

The MCP73213 provides specific charge algorithms for dual-cell Li-Ion/Li-Polymer batteries to achieve optimal capacity and safety in the shortest charging time possible.

The absolute maximum voltage, up to 18V, allows the use of MCP73213 in harsh environments, such as low-cost wall wart or voltage spikes from plug/unplug.

An internal overvoltage protection (OVP) circuit monitors the input voltage and keeps the charger in shutdown mode when the input supply rises above the typical 13V OVP threshold. The OVP hysteresis is approximately 150 mV for the MCP73213 device.

How it works

First you need to connect the input voltage to the input screw terminal. Then to set the input voltage, because it needs to be larger than voltage of two series connected batteries for regular charging, (which means it needs to be >8V). We can change the charging current trough SPI interface.

Now just leave the batteries to charge, and when they are charged it will be signalized on the status LED.

Specifications

Pinout diagram

This table shows how the pinout on MCP73213 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
	NC	1	AN	PWM	16	NC
	NC	2	RST	INT	15	NC
Chip Select	SPI_CS	3	CS	TX	14	NC
SPI Clock	SPI_SCK	4	SCK	RX	13	NC
	NC	5	MISO	SCL	12	NC
SPI Master output slave input	SPI_MOSI	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

Maximum ratings

Programming

Code examples for MCP73213 click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

The following code snippet shows how to initialize the SPI interface, and then use it to set output current to 250mA.

01 void main() {
02 
03      /*Sets chip select*/
04      GPIO_Digital_Output (&GPIOD_BASE, _GPIO_PINMASK_13);
05 
06      GPIO_Alternate_Function_Enable(&_GPIO_MODULE_SPI3_PC10_11_12);
07      /*Initializes SPI interface*/
08      SPI3_Init_Advanced(_SPI_FPCLK_DIV256, _SPI_MASTER | _SPI_16_BIT |
09        _SPI_CLK_IDLE_LOW | _SPI_FIRST_CLK_EDGE_TRANSITION | _SPI_MSB_FIRST |
10        _SPI_SS_DISABLE | _SPI_SSM_ENABLE | _SPI_SSI_1,
11        &_GPIO_MODULE_SPI3_PC10_11_12);
12 
13      SPI_Set_Active(SPI3_Read, SPI3_Write);
14      /*Sets chip select to inactive*/
15      GPIOD_ODR.B13 = 1;
16 
17      delay_ms(5000);
18 
19 
20 
21      //5 kOhm, 250mA
22      GPIOD_ODR.B13 = 0;
23      Spi3_Write(0b00000000);
24      Spi3_Write(0b10000010);
25      GPIOD_ODR.B13 = 1;
26      delay_ms(5000);
27 }