Balancer 4 Click Board™

Product Code: MIKROE-5271

How Does The Balancer 4 Click Board™ Work? The Balancer 4 Click Board™ as its foundation uses the MP2672A, a highly integrated and flexible switch-mode battery charger for two-cell Lithium-Ion batteries in series from Monolithic Power Systems (MPS). The MP2672A features a cell balance function that monitors the voltage across each cell and equalizes them if the difference exceeds the mismatch threshold. It features up to 2A of programmable charge current for batteries with two cells in series, alongside protections like battery temperature monitoring, programmable charging safety timer protection, JEITA-compliant battery NTC monitoring, cell over-voltage protection (OVP), thermal regulation, and thermal shutdown. The MP2672A has a narrow voltage DC (NVDC) power structure. It automatically detects the battery voltage and charges it in three phases: pre-charge, constant current, and voltage charge. With a deeply discharged battery, the MP2672A regulates the system output to a minimum voltage level, which powers the system instantly while simultaneously charging the battery via integrated FET.

It also offers flexible new charging cycle initiation compatible with Standalone mode and Host-control mode of operation selectable through an onboard switch labelled as HOST SEL. Diverse and robust protections include a thermal regulation loop to decrease the charge current if the junction temperature exceeds the thermal loop threshold and battery temperature protection compliant with JEITA standards. Other safety features include input over-voltage protection (OVP), battery OVP, thermal shutdown, battery temperature monitoring, and a configurable backup timer to prevent prolonged charging of a dead battery. Balancer 4 Click Board™ communicates with MCU using the standard I2C 2-Wire interface to read data and configure settings, supporting a Standard Mode operation up to 100kHz. It also has two LED indicators, red and green, marked with CHARGE and POWER, which can visually show the existence of a valid power supply to the MP2672A and the active status of the battery charging process. Also, an NTC function is available for temperature-qualified charging, where the MP2672A continuously monitors the battery's temperature by measuring the voltage on the onboard NTC header pins. The Balancer 4 Click Board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. It allows both 3.3V and 5V capable MCUs to use the communication lines properly. Additionally, there is a possibility for the MP2672A power supply selection via jumper labelled as VIN SEL to supply the MP2672A from an external power supply terminal in the range from 4V to 5.75V or with 5V voltage level from mikroBUS™ power rail. 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. SPECIFICATIONS Type Battery charger Applications Can be used for portable applications, Point-of-Sale (POS) machines, general two-cell applications, and more On-board modules MP2672A - highly integrated and flexible switch-mode battery charger from Monolithic Power Systems (MPS) Key Features Two-cell Lithium-Ion batteries in series, up to 2A configurable charge current, compatible with Host-control or Standalone mode, NVDC power path management, integrated cell-balancing circuit for mismatched cells, status indicators, I2C interface, NTC, and more Interface I2C Compatibility mikroBUS Click board size L (57.15 x 25.4 mm) Input Voltage 3.3V or 5V,External PINOUT DIAGRAM This table shows how the pinout of the Balancer 4 Click Board™ 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 NC 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 3.3V 7 3.3V