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TRF7970A: power on sequence

Simon Hsieh
Prodigy 20 points
Part Number: TRF7970A

Dear Sir ,

    Base on TRF7970 datasheet page 21, we can understand TRF7970 in nominal start up sequence request. In SPI with SS mode, EN pin rise up need delay 4mS after SS pin rise.

If SS pin and EN pin rise at the same time, does it has any concern ? As below is my waveform. and TRF7970 work is normal.

  • 0
    TI__Guru*** 135355 points
    Hello Simon,

    We have observed cases where not following the proper power up sequence resulted in the device not operating correctly. Please adjust the MCU handling to follow the timings outlined within the datasheet (note they are just minimum times, so they don't need to be exact, just need to wait at least the defined times or more).