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Original question:

I2S Emulation using SPI (TIVA TM4C1294XL and PCM1807)

PCM1807: SPI connection to a microcontroller

christian adam
Prodigy 10 points
Part Number: PCM1807

My senior design team and I are using the PCM1807 ADC to "feed" a digital signal to our microcontroller via SPI (The PMC1807 would act as slave), but we had some questions. It seems that the MS pin on the ADC is the "slave select pin", The MD pin is "MISO" and the MC would just be the system clock fed from the MCU. We are unsure of Pins 7-9 on the PCM ADC however. 7 and 8 seem like they would just connect to the same MCU fed system clock as the MC pin? and Pin 9 (DOUT) would connect to the MCU itself (not a part of the SPI communication)? Any help is welcomed as we are fairly confused by the layout!

  • 0
    TI__Expert 5645 points

    Hi Christian,

    Welcome to e2e Forum!

    As far as the SPI interface goes, please refer to the "SPI SERIAL CONTROL PORT FOR MODE CONTROL" section of the DS which explains functioning of SPI Serial Control Port.

    MS (pin 12) is held at a logic-1 state until a register is to be written. To start the register write cycle, MS is set to logic-0. Sixteen clocks are then provided on MC (pin 11), corresponding to the 16 bits of the control data word on MD (pin 10). After the 16th clock cycle has completed, the data is latched into the indexed-mode control register in the write operation. To write subsequent data, MS must be set to 1 once.

    Please refer to the figure 29 (shown below) for more details -

    Best regards.
    Ravi