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ADS7961-Q1: ADS7961

liulu liulu
Prodigy 80 points
Part Number: ADS7961-Q1
Other Parts Discussed in Thread: ADS7961

Tool/software:

Hi TI team,

I would like to know how the four GPIOs of the ADS7961 chip are handled internally. Are there pull-ups or pull-downs? Does it support software shutdown and enter shutdown mode? Can it share the same power supply with other chips? I look forward to your reply. Thank you very much.

  • +1
    TI__Genius 14700 points

    Hello,

    The GPIOs do not have internal pull-up or pull-down resistors. 

    Yes, the device has a power-down feature. See the power saving section of the datasheet below.

    Yes, the device can share a power supply with other chips. However, it is important to keep the supply and the voltage reference input clean from noise, as it may degrade performance.

    Regards,
    Joel

  • 0 in reply to Joel Meraz
    Prodigy 80 points

    My problem has been solved. Thank you for your reply.

  • 0 in reply to liulu liulu
    Prodigy 80 points

    Hi Meraz，

    I have encountered an issue where, during the device power-up sequence, Channel 1 exhibits a mid-level voltage during ADC sampling for approximately 2 seconds. Subsequent investigation revealed that the voltage source connected to Channel 1 powers up earlier than the ADS7961 itself, resulting in leakage current. Could this potentially cause damage to the chip? Alternatively, are there other methods to resolve this issue? I look forward to your response. Thank you.

  • 0 in reply to liulu liulu
    TI__Genius 14700 points

    Hello,

    Yes, conditions where voltage on the analog input exceeds the analog supply by more than 30mV should be avoided, as they can potentially damage the device. Ideally, the voltage should be limited externally, such as with a protection diode. 

    In the case that the analog input voltage does exceed the analog supply by more than 300mV, and it is not avoidable, the current should be limited to below 10mA (below 1 mA for best longevity) to prevent long term damage to the device.

    Regards,
    Joel