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PN7150 AGC test kills the chip

Question asked by Ken Altschuler on Jun 24, 2019
Latest reply on Jun 28, 2019 by Ken Altschuler

In my project, I added test code to enable the AGC reporting on the PN7510. The chip reports the AGC value as expected. Then when I remove that code, the chip no longer works. The NFC chip is no longer visible on any I2C address.

I killed three prototypes this way.

Why would this happen? Can I recover from this?

 

Steps to reproduce:

Change the original CORE_SET_CONFIG command from:

{ 0x20, 0x02, 0x05, 0x01, 0x00, 0x02, 0x64, 0x00 }

to:

{ 0x20, 0x02, 0x09,  0x02,  0x00, 0x02, 0x64, 0x00, 0xa0,0x40,0x01,0x81 }

 

The extra command is from section 3.6.41 of AN11755 Rev 1.6

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