AN2831 application note introduces how to use STw4102 chip to implement Li-Ion battery charging and monitoring
This document describes the STw4102, a device that combines charge control and battery monitoring functions for one-cell Li-ion batteries. It details how to configure the device for standalone operation or under system controller management, supporting both wall adapter and USB inputs.
The guide provides general control flow charts and specific instructions for setting charge parameters, managing the watchdog timer, and utilizing the gas gauge system to measure battery voltage and current.
| Battery Type | one-cell Li-lon battery |
|---|---|
| Charge Current (USB) | 100 or 500 mA |
| Charge Current (Wall Adapter) | set by external resistor |
| Charge Voltage (Power-up) | 4.1 V |
| Watchdog Period | 1, 15, 30 or 60 minutes |
It is used for Li-ion battery charging and monitoring in handheld devices like mobile phones and portable navigation devices.
The charge function is a standalone constant-current constant-voltage (CCCV) linear charger dedicated to the one-cell Li-lon battery.
It supports separate inputs for a USB cable and a wall adapter, or a single input that accepts both.