SPRACI9A October   2018  – July 2021 AM6526 , AM6528 , AM6546 , AM6548

 

  1.   Trademarks
  2. 1Introduction
  3. 2Recommendations Specific to the AM65x/DRA80x
    1. 2.1  EVM versus Data Sheet
    2. 2.2  Power
    3. 2.3  Reset
    4. 2.4  Boot Modes
    5. 2.5  Unused Signals
    6. 2.6  Clocking
    7. 2.7  System Issues
    8. 2.8  Low Power Considerations
    9. 2.9  DDR
    10. 2.10 MMC
    11. 2.11 OSPI and QSPI
    12. 2.12 GPMC NAND
    13. 2.13 I2C
    14. 2.14 CPSW Ethernet
    15. 2.15 ICSSG
    16. 2.16 USB
    17. 2.17 SERDES - USB3
    18. 2.18 SERDES - PCIe
    19. 2.19 JTAG and EMU
  4. 3References
  5. 4Revision History

2.8 Low Power Considerations

If you are designing for low power, here are some tips to help you optimize your design for low power:

  • On early prototype boards, TI recommends including small shunt resistors in the voltage rail paths of each of the following power rails of AM65x/DRA80x device: VDD_CORE, VDD_MCU, VDD_MPU0-1, VDDSHV0-2_WKUP, and VDDSHV1-11. These are listed in order of priority, so if you can't isolate all of these to measure power; the most important ones are the core rails VDD_CORE, VDD_MCU, VDD_MPU0-1, and so forth. Also, the VDDSHVx supplies may be broken into multiple segments and run at different voltages. This can help measure the power consumption of each rail and potentially pinpoint high power consumption during development. You may also want to add these shunt resistors for power supplies connected to other devices, to be able to measure power on those key devices. The AM654x/DRA80x EVMs have examples of these shunt resistors. For production, these shunt resistors must be removed from the design (that is, turned into a continuous plane) because these resistors restrict current flow and add inductance to the PDN.