ADS1271: Pin /PDWN

Roger Backhus

Part Number: ADS1271

The data sheet does not really say what to to with pin /PDWN when it is not used. Is it pulled up internally? Do I have to pull it up and if so then what level do I pull it up to?

over 2 years ago

0 Keith Nicholas over 2 years ago

TI__Guru 51370 points

Hello Roger,

The /PDWN pin should be connected to DVDD for normal operation. There is no internal pull-up for this pin.

If /PDWN pin is permanently pulled high, then I would suggest that the AVDD supply and reference voltage are first applied during power-up before DVDD supply is brought up to nominal value to ensure a proper offset calibration.

Regards,
Keith Nicholas
Precision ADC Applications

0 Roger Backhus over 2 years ago in reply to Keith Nicholas

Intellectual 425 points

Thank you.

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ADS1271: Pin /PDWN