Balancer 5 Click-Board

How Does The Balancer 5 Click Board™ Work?

The Balancer 5 Click Board™ is based on the BQ25887 form Texas Instruments- fully integrated 2-cell Li-ion battery charger IC ideal for portable applications with cell balancing. The BQ25887 optimizes the charging two battery with balancing. The input voltage range from USB connector can be as high as 5.5V, battery can be charge with up to 3.3A. When the input voltage exceeds the OVP (Over Voltage Protection) threshold, it will turn off the charging MOSFET to avoid overheating of the chip. Along with its small physical size, the low number of external components makes this IC ideally suitable for various applications.

As a Lithium Ion batteries require a very accurate current and voltage for charging, the Balancer 5 Click Board™ can be a perfect solution for such a task. The Balancer 5 Click Board™ is equipped with a highly integrated Li-Ion battery charger, supporting intelligent, constant-current, constant voltage (CCCV), temperature-regulated battery charger charges a 2-cell lithium-ion (Li+) cell batteries. This click has a charging current control IC over I2C interface which ensures perfect and efficient charging. Balancer 5 click can be used as a part of the power supply and distribution system in many applications: different kinds of handheld appliances, portable media players, portable audio players, and other general-purpose battery-operated electronic devices.

On the left side of the click board is an input USB connector, where the external voltage as high as 5.5V can be applied. Two connectors on the right side is reserved for a Li-Ion batteries with corresponding markings, right connector is for first batteries and left connectr is for secound batteries. When connected to power source, the green CHARGE LED will indicate it, LOW indicates charge in progress. HIGH indicates charge complete or charge disabled. When any fault occurs, the STAT pin blinks at 1Hz. The STAT function can be disabled when the STAT_DIS bit is set.

On right side is 1x2 male header for connect a NTC (Negative temperature Coefficient) resistor. Connect a negative temperature coefficient thermistor. Program temperature window with a resistor divider from REGN to TS to GND. Charge suspends when TS pin is out of range. Recommend 103AT-2 thermistor.

The voltage range which can be used to power up the Balancer 5 click, allows for it to work with 5V capable MCUs.

SPECIFICATIONS

Pinout Diagram

This table shows how the pinout of the Balancer 5 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Power Good	PG	1	AN	PWM	16	NC
Power Source Selection	PSS	2	RST	INT	15	INT	Interrupt pin
Chip Disable	CD	3	CS	RX	14	NC
NC	4	SCK	TX	13	NC
NC	5	MISO	SCL	12	SCL	I2C Clock
NC	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	NC	7	3.3V	5V	10	5V	Power supply
Ground	GND	8	GND	GND	9	GND	Ground

ONBOARD SETTINGS AND INDICATORS

RS485 4 CLICK ELECTRICAL SPECIFICATIONS