Charger 23 Click Board™

Product Code: MIKROE-5573

How Does The Charger 23 Click Board™ Work? The Charger 23 Click Board™ is based on the ISL78693, an integrated charger for single-cell Lithium chemistry batteries from Renesas. The ISL78693 functions as a traditional linear charger. The ISL78693 charges a battery as a linear charger in the Constant Current (CC) and Constant Voltage (CV) profile. Its constant charge current is selectable via onboard jumper CURR SEL between 250 and 500mA. The charge voltage is also characterized by an accuracy of 1% over the entire recommended operating condition range. The charger automatically recharges the battery when the voltage drops below a recharge threshold of 3.3V typically. When the input supply is not present, the ISL78693 draws less than 1µA current from the battery. The Charger 23 Click Board™ communicates with the host MCU using several pins of the mikroBUS™ socket. The charger can be enabled or disabled using the EN pin of the mikroBUS™ socket, offering a switch operation to turn ON/OFF the charger.

In addition, the ISL78693 also has two indication signals to indicate the charge status. The ST pin is a status open-drain that turns to a low logic state at the beginning of a charge cycle until the End-of-charge (EOC) condition is qualified. Once the EOC condition is qualified, the ST pin goes to a HIGH logic state. The fault pin (FLT) turns low when fault conditions occur, such as the external battery temperature fault, a charge time fault, or battery removal. Besides mikroBUS™ pins, there is also their visual representation via red and yellow LEDs marked with STATUS and FAULT. An NTC function is also available to monitor the battery temperature and ensure a safe charging temperature range. Apart from monitoring, it is also possible to detect the removal of the battery. To use this function, it is necessary to switch the SEN EN jumper to the YES position and to connect an external NTC to the SENSE header pins. The Charger 23 Click Board™ can only be operated from a 5V logic voltage level. Therefore, the board must perform appropriate logic voltage conversion before using MCUs with different logic levels. Additionally, there is a possibility for the ISL78693 power supply selection via jumper labelled as VIN SEL to supply the ISL78693 from an external 5V power supply or with a 5V 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 as a Li-Ion/Polymer battery charger for portable devices and accessories, power tools, and more On-board modules ISL78693 - single-cell Li-ion or Li-polymer battery charger from Renesas Key Features Operates as linear charger, selectable charge current, preconditioning of an over-discharged battery, NTC thermistor interface, automatic recharge, CC/CV charge profile, battery removal detection, charge status indication signals, and more Interface GPIO Compatibility mikroBUS Click board size M (42.9 x 25.4 mm) Input Voltage 3.3V,5V PINOUT DIAGRAM This table shows how the pinout of the Charger 23 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes Charge Status ST 1 AN PWM 16 NC Enable EN 2 RST INT 15 FLT Fault Indicator NC 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 Label Name Default Description LD1 PWR - Power LED Indicato