Charger 3 Click Board™

Product Code: MIKROE-4449

How Does The Charger 3 Click Board™ Work? The Charger 3 Click Board™ is based on the TP4056, a complete constant-current/constant-voltage linear charger for single-cell lithium-ion batteries from NanJing Top Power ASIC Corp. This standalone battery charger automatically terminates the charge cycle when the charge current drops to 1/10th of the programmed value after reaching the final float voltage. Thermal feedback regulates the charging current to limit the die temperature during high power operation or high ambient temperature. It also features current monitoring, under-voltage lockout, automatic recharge, and two LEDs to indicate charge termination and the presence of an input voltage. The charge voltage of the TP4056 is specified at 4.2V with 1.5% accuracy, with the charge current pin programmable up to 1000mA via an onboard single-channel digital potentiometer, the AD5175 from Analog Devices, controllable through the I2C compatible digital interface. When the TP4056 is in a pre-charge mode, this pins voltage is regulated to 0.2V, while in constant-charge current mode voltage is regulated to 2V.

During the charging process, the voltage on this pin can be used to measure the charge current. The Charger 3 Click Board™ has the possibility of connecting an external temperature sensor on the onboard header labelled as NTC. If the voltage of this pin is below 45% or above 80% of supply voltage for more than 0.15s, this means that the battery's temperature is too high or too low, suspending the charging process. Alongside this feature, this Click board™ also has two LEDs to indicate charge termination and the presence of an input voltage, a red LED labelled as CHG indicating charging process, and green LED labelled as STB for 'charged' status. The Charger 3 Click Board™ is designed to operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. It allows for both 3.3V and 5V capable MCUs to use the I2C communication lines properly. However, the Click board™ comes equipped with a library that contains functions and an example code that can be used, as a reference, for further development. SPECIFICATIONS Type Battery charger Applications Can be used for the development of multiple Li-ion battery cell charging applications On-board modules TP4056 - complete constant-current/constant-voltage linear charger for single-cell lithium-ion batteries from NanJing Top Power ASIC Corp AD5175 - single-channel digital potentiometer from Analog Devices Key Features Programmable charge current up to 1000mA, complete linear charger for single-cell Lithium-Ion batteries, constant-current/constant-voltage, two charge status indicators, and more Interface I2C Compatibility mikroBUS Click board size S (28.6 x 25.4 mm) Input Voltage 3.3V or 5V PINOUT DIAGRAM This table shows how the pinout on Charger 3 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 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 5V 10 5V Power Supply Ground GND 8 GND GND 9 GND Ground ONBOARD SETTINGS AND INDICATORS Label Name Default Description LD1 PWR - Power LED Indicator LD2 CHG - Charging State LED Indicator LD3 STB - Standby State LED Indicator JP1 VCC SEL Left Logic Level Voltage Selection 3V3/5V: Left position 3