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TDC1000-TDC7200EVM: TDC1000 and TDC7200 RESET vs ENABLE

Mesut TOPUZLU
Intellectual 690 points

Part Number: TDC1000-TDC7200EVM

Hi eveybody. I have two question.

Q1: TDC1000 have two pins; EN and RESET. What is the difference between two pins tecnically? 

When EN pin or REST pin is activated, do  all of registers in TDC1000 go reset value?

Q2: does TDC7200 react like TDC1000 when RESET pin of TDC7200 go high. 

Regards....

  • 0
    TI__Mastermind 31655 points
    Hi Mesut,

    Q1.
    They do have similar functionality, and both must be in the correct state to begin a measurement or complete a measurement that has already begun. If the ENABLE is brought low the device will exit the measurement and go into the sleep state. If the RESET pin is brought high the device will exit the measurement and go into the sleep state.

    However, if the measurement has not been started yet the ENABLE must be pulled high and the RESET pin must be pulled low before the measurement can begin.

    The configuration and status registers for the TDC1000 will remain set until power has been removed from the device. Pulling ENABLE low, or pulling RESET high will not reset the registers, it will only discontinue the current measurement.

    You can find the full information about these pins in the State Machine section of the datasheet.

    Q2.
    There is no RESET pin for the TDC7200. When the ENABLE pin of the TDC7200 is brought low, the device will stop its measurement sequence and go into a low power state. It will clear the registers and need to be reconfigured when the ENABLE is brought high again.

    Regards,
  • 0 in reply to Scott Cummins
    Intellectual 690 points
    Thanks...
    You said that EN pin for TDC7200 will clear (when set to low) configuration. OK
    But, When I pressed "RESET TDC7200" button on TDC1000-TDC7200 EVM GUI and read all register (I change some register before reset for test) I dont see any reset value for register. I also unpluged JP1 (TDC7200 - 3v3 power connection jumper) and result is same; there are registers that is not been reset.
    is there a bug on GUI ?
  • 0 in reply to Mesut TOPUZLU
    TI__Mastermind 31655 points
    Hi Mesut,

    The GUI seems to be operating properly, but the TDC7200 does not seem to be behaving as expected from the datasheet. The ENABLE pin is pulled low when the reset button is pressed, but as you mentioned, the registers are not reset as explained in the "Measurement sequence" section.

    The reason that the registers are not reset when JP1 is removed is because the VDD is somehow still sitting at 2.2V. The voltage drops only if the power to both the MSP430 is removed (open JP2) and the clock jumper (JP6) is moved away from the OSC position.

    I will have to look into the cause of this.

    Regards,