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TiWi unused pin handling

Charles McCallum
Intellectual 2620 points
Other Parts Discussed in Thread: WL1271

Are the below assumptions correct if the follwoing pins are not planned to be used on the WL1271 based TiWi module?

  • Pin 33        AUD_FSYNC        Says its a DIO.  I am pulling it low.
  • Pin 37        AUD_CLK        Says its an output so I left it as a NC
  • Pin 38        AUD_OUT        Says its an output so I left it as a NC
  • Pin 40        AUD_IN        Says its an input.  I am pulling it low.
  • Pin 41        BT_FUNC2        Says its an input.  I am pulling it high.
  • Pin 42        BT_FUNC4        Says its an output so I left it as a NC
  • Pin 2        BT_FUNC5        Says its an output so I left it as a NC
  • 0
    TI__Intellectual 1340 points

    Charles:

    Pins 33, 37, 38, 40 and 42 are fine the way you have it.

    Pins 41 (BT_FUNC2) and 2 (BT_FUNC5):

    "When BT is awake and active, BT_WU (BT_FUNC2) is high (from host to BT). This is high level signal. The host puts the BT section to sleep by de-asserting the BT_WU signal (input to WL1273). Then BT_WU acts as a low level signal. BT then drives HOST_WU (BT_FUNC5) low to acknowledge to the host that it is ready to be put into sleep mode."

    Arild