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DAC3283 - Bi-directional SDIO in 4 wire mode - SPI Reads - Contention?

Kevin Schilf
Prodigy 70 points
Other Parts Discussed in Thread: DAC3283

Dear TI:

The DAC3283 datasheet (Section 8.4.1, p. 17) says that SDIO is "bi-directional" in 4-pin SPI mode.  I would expect that this pin would be an input (MOSI).

Does this mean that data is being driven on this pin?  The FPGA driving the SDIO pin does not tri-state.  Is this going to cause contention?

Thanks!

KS

  • 0
    TI__Genius 9695 points

    Hi Kevin,

    In 4wire mode, the same data is driven out of the DAC on both the SDIO pin and the ALARM_SDO pin. If the FPGA is still driving the SDIO pin, then this will cause contention and corrupt the data on SDIO. In this case, ignore the data on the SDIO pin and use the same data from the ALARM_SDO pin instead.

    Thanks,

    Eben.