This is an application note about ST72324L MCU, which describes how to use it to build a rechargeable battery charger.
This document details the design of a cost-effective universal battery charger capable of charging both Li-ion and NiMH batteries. The design is based on an evaluation board centered around the ST72324L microcontroller, which utilizes an embedded buck-boost converter and an on-chip A/D converter to measure voltage, current, and temperature. The note explains the charging algorithms, including constant current/constant voltage for Li-ion and constant current with delta voltage or temperature detection for NiMH batteries.
The charger is designed to charge single cell Li-ion batteries or 2 cell NiMH batteries.
The design uses the Zero Delta Voltage method as the primary technique, with Time Out and Max Temperature as backup methods.
An LED is used to indicate the status: OFF for no battery, flashing for charging or problems, and ON for battery present or complete.