AN55102 presents a Lithium-Ion (Li-Ion) battery charger design, with the smallest, low-cost PSoC® 1 device – CY8C21x23. This application note includes a dedicated PC-based software developed to perform real time charge process monitoring and analysis.
Introduction
Li-Ion batteries have the greatest capacity to volume ratio and are found in notebooks, pocket PCs, cell phones, and other cutting-edge consumer products.
This application note describes a single cell Li-Ion battery charger for a 500 mAh battery using the smallest and lowest-cost chip in the PSoC family, CY8C21x23.The battery capacity and other battery parameters can easily be changed by modifying corresponding constants in the firmware to support different batteries.
Multiple methods such as, self modulated voltage reference, pin multiplexing, time multiplexing of resources, and code optimization have been used to implement the design in this chip. The charger can be embedded into consumer and home appliances or industrial applications. The production level design can be implemented in an 8-pin CY8C21123 device. The development can be done in CY8C21223 to add the digital communication required for charge monitoring.
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Example Project |
Supported H/W and S/W | Supported PSoC1 Devices | |||||||||
| PSoC Designer Version | H/W Kit | CY8C20xxx | CY8C21xxx | CY8C22xxx | CY8C23xxx | CY8C24xxx | CY8C27xxx | CY8C28xxx | CY8C29xxx | ||
| Yes | 5.4 | Custom board | x23, x34 | ||||||||