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ST25DV64K-IER6S3 - GPO Operation (open drain)

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GErma.1
Associate III

‎2020-11-02 08:48 AM

Hi

I am trying to obtain the smallest possible power consumption with an ST25DV64K-IER6S3 device. I am wondering is the GPO pin is still operational when VCC is removed? Is it the GPO circuit powered by the RF interface?

Best Regards

Gilberto

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JL. Lebon
ST Employee

‎2020-11-03 12:34 AM

​Hello,

Yes, GPO is triggered independently from VCC.

In absence of VCC, the GPO logic is powered by the RF field.

On the Open drain version of the ST25DV (St25DV64K-IE6S3), the GPO output is open drain, which means it needs to have an external pull-up resistor connected to it in order to work. This pull-up must be powered somehow by an external power source (VCC, or even energy harvesting).

Best regards.

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GErma.1
Associate III

‎2020-11-02 03:42 PM

Hi

I have managed to run some testing with ST25 APP from ST. It seems that GPO is triggered independently of VCC. Just need need to confirm that.

BR

Gilberto

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JL. Lebon
ST Employee

‎2020-11-03 12:34 AM

​Hello,

Yes, GPO is triggered independently from VCC.

In absence of VCC, the GPO logic is powered by the RF field.

On the Open drain version of the ST25DV (St25DV64K-IE6S3), the GPO output is open drain, which means it needs to have an external pull-up resistor connected to it in order to work. This pull-up must be powered somehow by an external power source (VCC, or even energy harvesting).

Best regards.

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