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SPRAC74A–February 2017–Revised March 2017
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Copyright © 2017, Texas Instruments Incorporated
AM335x Low Power Design Guide
Design Guide
SPRAC74A–February 2017–Revised March 2017
AM335x Low Power Design Guide
This document discusses techniques to develop a low power, low cost system based on the AM335x
series processor. The goal is to explain how system design choices affect power consumption and how
power consumption can vary significantly depending on how the developer’s application runs in that
system under specific conditions.
Contents
1 Introduction ................................................................................................................... 2
2 Hardware Low Power Design Guidelines................................................................................. 2
3 Linux Power Optimization Features...................................................................................... 10
4 Example Low Power Use Cases ......................................................................................... 23
5 References.................................................................................................................. 33
Appendix A Additional Information............................................................................................. 34
List of Figures
1 Input Buffer ................................................................................................................... 4
2 GPIO Leakage Scenarios .................................................................................................. 5
3 Internal Pull Up/Down ....................................................................................................... 6
4 Four-Wire Resistance Measurement Configuration ..................................................................... 9
List of Tables
1 Recommended PMICs ...................................................................................................... 3
2 Power Domains on the AM335x.......................................................................................... 22
3 AM335x MPU Supported Operating Performance Points............................................................. 25
4 AM335x Core Supported Operating Performance Points............................................................. 25
5 AM335x GP EVM vs. BeagleBone Black DDR Design ............................................................... 26
6 Device Tree and Peripherals Use........................................................................................ 26
7 Peripherals Disabled by Device Tree.................................................................................... 26
8 Optimized OS Idle Power Consumption ................................................................................ 28
9 Power Consumed by DDR on the BeagleBone Black ................................................................ 28
10 Optimized Networked OS Idle Power Consumption................................................................... 29
11 Optimized Dhrystone Power Consumption ............................................................................. 30
12 Optimized Network Load Power Consumption......................................................................... 31
13 Optimized Multimedia Playback Power Consumption................................................................. 32
14 Optimized Low Power Mode Power Consumption..................................................................... 33
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Linux is a registered trademark of Linux Torvalds in the U.S. and other countries.
Windows is a registered trademark of Microsoft Corporation in the United States and/or other countries, or
both.
All other trademarks are the property of their respective owners.
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