Post Go back to editing

AD5940 Hibernate mode: Can IOVDD Be Powered Off While Maintaining Sensor Bias?

Category: Hardware
Product Number: AD5940
Hi,
I have a question regarding Hibernate mode. My goal is to maintain the electrochemical sensor bias while the overall system is in Ship Mode.
During Ship Mode:
  • AVDD and DVDD remain at 3.3 V
  • RESET remains pulled high from an always-on 1.8 V rail
  • IOVDD drops to 0 V because the system 1.8 V rail is turned off during the ship mode
  • No SPI communication is required
My question is: Can IOVDD be powered down to 0 V while the AD5940 is in Hibernate mode with the low-power DAC, low-power reference, and potentiostat enabled to maintain sensor bias?
Would this affect the VBIAS/VZERO levels or the ability to resume normal operation once IOVDD is restored?
I could not find any specific guidance in the datasheet regarding whether IOVDD must remain powered during Hibernate mode, so I wanted to confirm the intended operating condition.
Parents
  • Hi,

    No, we would not recommend operating the AD5940 with AVDD and DVDD powered while IOVDD is at 0 V.

    This would be a partially powered device condition and would violate the device's operating requirements. In general, powering only some supply domains while leaving others unpowered can create unintended current paths through internal protection structures and digital circuitry.

    Regards,

    Mark

Reply
  • Hi,

    No, we would not recommend operating the AD5940 with AVDD and DVDD powered while IOVDD is at 0 V.

    This would be a partially powered device condition and would violate the device's operating requirements. In general, powering only some supply domains while leaving others unpowered can create unintended current paths through internal protection structures and digital circuitry.

    Regards,

    Mark

Children
No Data

Before You Switch


Switching languages will make ADI Explorer unavailable. Resume your session by switching back to English and reopening ADI Explorer.