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SK-AM64: AM64x Start Kit Board Pi HAT current supply issue

Tim Cruise
Intellectual 927 points

Part Number: SK-AM64

Dear TI Engineers,

I am developing my Wi-SUN border router on a AM64x Starter Kit Board

www.ti.com/.../SK-AM64

According to the user manual of AM64x Starter Kit, the Raspberry Pi extension header provides a maximum of 200mA current.  If I install a very hard-working broad band dialup modem which may exceed 200mA usage, is it possible to increase the Raspberry Pi extension bus's current supply?

  • +1
    TI__Expert 3300 points

    Hi Tim, 

    If you are going to need to source more than 200mA I recommend cutting/isolating the pin from the header side so that you can provide 3.3V from your own supply. Just make sure you don't try to back-feed any supply through the Pi Header to the AM64 board. Grounds should remain shared of course.

    Best,

    Andrei 

  • 0 in reply to Andrei Aldea
    Intellectual 927 points

    Andrei,
    okay.

    Another problem is:
    If I need to match Raspberry Pi Hat pins to specific MCU peripherals, for example, I2C, UART, etc., what are the tools provided to accomplish this task?  I have loaded the Processor SDK Linux for AM64x into the board.

  • 0 in reply to Tim Cruise
    TI__Expert 3300 points

    Hi Tim,

    While the hardware connections are all there, you will still need to figure out required DTS changes and possibly muxing changes (via GPIO) to enable functionality on the pi header. The same is applicable if you’re trying to use Pi-specific libraries, you would have to edit any code you use to adapt it to AM64, you can’t use off-the-shelf code or libraries designed to use Pi peripherals and GPIOs for the most part.

    Best,

    Andrei