Example Low Power Use Cases
www.ti.com
32
SPRAC74A–February 2017–Revised March 2017
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
AM335x Low Power Design Guide
4.5 Multimedia
Device Tree Name Ethernet SGX
am335x-gp-evm-powersave.dtb No No
Multimedia uses the standard runMpeg4AacDecode.sh script that is included with all Processor SDK
distributions. It simply configures the AM335x GP EVM to play a short clip from a movie trailer and output
audio onto a line out jack. LCD brightness and audio levels were left at the default settings.
In order to support multimedia display the following peripherals were enabled:
• LCD panel
• PWM backlight
• LCD controller
• Touch screen controller (adc)
• McASP
Table 13. Optimized Multimedia Playback Power Consumption
Power Rail Voltage (V)
MPU OPP50
(300 MHz)
(1)
MPU OPP100
(600 MHz)
MPU OPP120
(720 MHz)
MPU OPP
Turbo
(800 MHz)
MPU OPP Nitro
(1000 MHz)
Power (mW) Power (mW) Power (mW) Power (mW) Power (mW)
vdd_core_power 1.1 181.66 185.76 187.66 188.39 190.63
vdd_mpu_power DVFS (0.95 -
1.325)
85.51 223.17 317.80 386.93 512.13
1.8V I/O 1.8 35.90 38.65 40.01 40.69 42.81
3.3V I/O[1] 3.3 100.98 103.69 105.55 104.08 102.99
SoC Power without DDR3 404.05 551.27 651.02 720.08 848.56
vdds_ddr 1.5 150.91 151.77 153.58 154.22 156.28
vddsddrmem 1.5 117.21 133.29 139.00 139.67 146.72
DDR3 Total Power (Includes VTT) 268.12 285.06 292.58 293.89 303.01
Total Power (SoC + DDR3) with
VTT
672.17 836.33 943.06 1013.97 1151.57
(1) MPEG4 + AAC decode at this OPP experienced significant numbers of dropped frames
To Next Page
Loading...
