Rev. 0.1 9/12
Copyright © 2012 by Silicon Laboratories
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1. Introduction
The system power budget of a low power system has two components: active and low power mode. Active mode
periods include an active core executing code or a larger number of active peripherals. In low power mode periods,
the core enters a sleep state and fewer peripherals are active.
Figure 1. Defining the Power Budget—Active and Low Power Modes
SiM3L1xx devices have several features to address reducing power consumption in all operational modes to
achieve a longer product lifetime in battery-operated systems. This document addresses each of these features
and provides guidelines for achieving low power consumption in a variety of configurations and applications.
2. Key Points
This key topics of this document are as follows:
How to reduce active mode time and power consumption
How to reduce low power mode power consumption
Measuring the low power modes on an SiM3L1xx MCU card
General power-saving tips
3. Relevant Documentation
Precision32™ Application Notes are listed on the following website: www.silabs.com/32bit-appnotes.
AN666: Usage Guide for e SiM3U1xx,SiM3C1xx, and SiM3L1xx DMA and DTM Modules
AN720: Precision32™ Optimization Considerations for Code Size and Speed
AN667: Getting Started with the Silicon Labs Precision32 IDE
AN670: Getting Started with the Silicon Labs Precision32 AppBuilder
Active Mode
Low Power
Mode
