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i.MX233 power management unit and battery charger

Posted: 27 Aug 2009     Print Version  Bookmark and Share

Keywords:i.MX233 PMU  power management unit  power supplies 

This application note describes the low-level blocks of the power management unit (PMU). This document covers the basic configurations for the power supplies and power rails, and how to use these building blocks to perform useful functions in the i.MX233 such as handling power source transitions and raising and lowering power rails. This application note describes the battery charger block and provides instructions to charge a battery. The power savings features of the i.MX233 are also described.

The i.MX233 applications processor integrates a highly-efficient and comprehensive power supply. It is powered by a Li-Ion battery or 5 V power source and generates five internal power rails through two separate supplies. All the hardware in the PMU must be configured through firmware. The i.MX233 requires direct modifications to registers in the power block. This adds complexity, but also provides firmware the ability to optimise the device power beyond a typical power management unit.

The information provided in this document is intended to supplement the information provided in the i.MX233 datasheet. Register names and bitfields are frequently referenced.

View the PDF document for more information.

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