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ADS1247: RESET pin function

Taketo Sato
Genius 10315 points
Part Number: ADS1247

Hello team,

I have a quick question about ADS1247 RESET pin pulse.

Datasheet says at least 4tclk is required for RESET pin low duration to reset device by RESET pin.

Could you please let me know whether reset is performed or not when RESET pin low duration is shorter than 4tclk?

I would like to know it to confirm if the device could be reset when noise is applied to RESET pin line.

Best regards,

  • 0
    TI__Guru 55152 points
    Hello Sato-san,

    Thanks for your post!

    Since the minimum duration is 4tclk, the only way to guarantee that a reset is performed is if the pin is held low for at least 4tclk. The device should not reset if the pin is held low for less than 4tclk.
  • 0 in reply to Alexander Smith
    TI__Genius 10315 points
    Hello Alex-san,

    Thanks for prompt reply.
    I understand the device shouldn't perform reset if the pin is held low for less than 4tclk, like a noise event on RESET pin.
    Customer is seeing some register settings somehow get back to reset values and suspected it is due to noise on RESET pin. I will confirm SPI timing requirement is proper.

    Best regards,
  • 0 in reply to Taketo Sato
    TI__Guru 55152 points
    Hello Sato-san,

    I am happy to help!

    Another thing to check for is noise on the GND - especially during transient or ESD events. If the GND level shifts past a certain point it can cause the device to RESET.