Measure voltage on ST_R0 pin on CR95HF in production test?

[MJons.1]

We are using the CR95HF chip for NFC functionality in our product. I know ST_R0 pin have restricted use and shall be connected to ground with a 1nF cap. I would like to know if is possible to connect a test point to this net and in our production test fixture measure the voltage level to verify the antenna tuning. When the board is under test the signal will be routed way in the fixture to a multi I/0 DAQ board.

Best regards

Magnus

[Brian TIDAL]

Hi Magnus,

I guess you have probed the ST_R0 pin and have done some reverse on it. Anyway, as this pin is marked as ST Reserved, the precision of the voltage level cannot be guarantied and it cannot be officially recommended to use it for production tests.

Rgds

BT