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TDC7201-ZAX-EVM: Dout1 and Dout2 in Parallel

George Harris66
Prodigy 40 points
Part Number: TDC7201-ZAX-EVM
Other Parts Discussed in Thread: TDC7201, MSP-EXP430F5529LP

I am trying to use the TDC7201 Evaluation board with the MSP-EXP430F5529LP.

I am trying to use dout1 and dout2 in parallel.

I have removed R16 and populated R7, R15 and R14.

I have checked all the GUI for the TDCEVM is working correctly.

On the Dout2 test point the signal when being tested is only 0.8Vpp instead of 3.3V.   

Since I have traced the signal on the TDC evaluation board is correct, I am looking at the MSP-EXP430F5529LP.

I have traced the P4.2 to a jumper pin on the MSP board and tried removing the jumper without success.

Question: Is there anything you can recommend? I cannot find any guidance for this situation.

Regards

  • 0
    Prodigy 40 points

    This is all I have to go by on the GUI

  • 0 in reply to George Harris66
    TI__Mastermind 27940 points

    Hi George,

    If you are attempting the following:

    "...by keeping DOUT1 and DOUT2 separate, data can be read out of the TDCs in parallel using their dedicated OUTx pins. This doubles the data readout throughput but requires a second dedicated SPI interface of the MCU."

    then here are my comments on the required changes:

    There are only two available dedicated SPI ports on the MSP-EXP430F5529LP mapped to the following Px.x pins:

    • SPI Port 0: MISO(P3.1), MOSI(P3.0), SCLK(P3.2)
    • SPI Port 1: MISO(P4.2), MOSI(P4.1), SCLK(P4.3)

    You can see the MSP-EXP430F5529LP pinout here: 

    Since the parallel mode of operation requires two SPI interfaces, R14, R15 and R7 should remain populated, as these are used by the second SPI interface (SPI Port 1) for DOUT2. Only R16 should be removed to decouple DOUT1 and DOUT2.

    I am not certain what the original GUI author intended by step-c in the GUI prompt. This prompt overall does not seem correct at first glance. If you still have trouble after my recommended changes, then I will need to explore the GUI firmware in depth to better understand how the SPI interface is used for parallel mode (assuming this mode is fully supported by GUI).

    Note: the J1 and J2 connectors on the schematic page of the TDC7201EVM user's guide are y-axis mirrored (i.e. J1 pin 1 should be top left when looking at the board, but is shown as top right on the schematic).