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Original question:

Interfacing TDC7200EVM with arduino and Kintex Ultrascale FPGA

TDC7200EVM: TDC7200EVM

Foram Shingala
Prodigy 130 points
Part Number: TDC7200EVM
Other Parts Discussed in Thread: TDC7200, MSP-EXP430F5529LP,

I have interfaced arduino and TDC7200 evm. Till few days ago it was working, then it started showing the Failed to Initialise the TDC7200. How to check if the communication is working. What are the registers to check and what are the pins to probe and how much the voltage should it show so that we don't suspect IC is damaged?

  • 0
    TI__Mastermind 27950 points

    Foram,

    Are you able to read and/or write to the TDC7200 registers using SPI? If so, you can first try reading all the device registers to check if each address is initialized with the default value as shown in Table 1 - Register Summary of the datasheet. Many of the values between addresses 0x00 to 0x09 have non-0 reset values.

    In know most Arduino's operate at 5V, but the TDC7200 only allows up to 3.6V in supply voltage and digital logic level communication. How have you connected the TDC7200 EVM to the Arduino? Do you have a schematic we can review that shows a 5V-to-3.3V LDO and level translator for example?

  • 0 in reply to Akeem Whitehead
    Prodigy 130 points

    Hey AKeem

    I did check all the registers. It is showing 0V only.

    Between arduino and TDC7200, what you told was correct arduino at 5V and TDC7200 at 3.3V. We just used voltage divider for all the pins with two resistors.

    It was working and it still works with the other TDC7200.

    Please tell me if i can check any voltage on the pins of the TDC7200 to check?

    Regards

    Shyam S

  • 0 in reply to Foram Shingala
    TI__Mastermind 27950 points

    Shyam,

    Do you have the MSP-EXP430F5529LP to run the original EVM hardware combination with the LaunchPad?

    To spot check some of the non-0V pins on the TDC7200EVM:

    • VDD = 2 to 3.6V (with 2 to 5mA of available supply current from source)
    • VREG = ~1.8V (when VDD = 3.3V)
    • CSB = VDD (sourced from master)

    Try replacing the VREG capacitor, as the capacitor may be damaged

  • 0 in reply to Akeem Whitehead
    Prodigy 130 points

    Hey I dont have the MSP board.

    I checked the pins

    VDD is 3.26V.

    VREG is 0V

    CSB is 2.2V

    so replacing the capacitor connected to VREG will it work ?

    Thanks and regards

  • 0 in reply to Foram Shingala
    TI__Mastermind 27950 points

    Hi Foram,

    Yes, try replacing the VREG capacitor. The internal supply voltage regulator for the TDC7200 does not seem to be operational, which may be due to the failure of the VREG cap.

    If the cap replacement does not work, then there may be internal damage to the device, whereby the voltage from VDD is not reaching the internal regulator input. You can try forcing a voltage of 1.8V at the VREG pin to see if this revives the device also.

    Also, what values are you using at the resistor voltage divider to step-down 5V to 3.3V? You should ensure the resistor values are not too large so that the proper supply current can reach the TDC7200 (up to 5mA).