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January 2008 Rev 1 1/48
AN2633
Application note
STR91xFA low power management
and power consumption
Introduction
Power consumption is a significant issue for developers of embedded systems today.
Whether the target application is a cellphone, MP3 player, remote control, bio-medical
device or one of a whole new generation of electronic products, it is very likely that efficient
power management and low current consumption are on top of the list of design goals. In
terms of low power design techniques, more and more embedded designers use dynamic
control of clocks and frequencies. For this reason, this application note focuses on this in the
context of the STR91xFA microcontroller family.
This application note is intended for system designers who require a hardware
implementation overview of the STR91xFA low power modes. It includes details on the
power supply circuitry and components, clock systems, register settings and power
management. This guideline document is intended to show how to make the best use of the
extensive low power features of the STR91xFA microcontroller family,
Software source files can be downloaded with this application note for testing the STR91xFA
power modes.
www.st.com
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