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PN7462 NFC chip does not come back to sleep current(18uA) after first NFC card detection.

Question asked by Midhun V R on Nov 22, 2018
Latest reply on Nov 26, 2018 by Kan_Li


I am using PN7462AU NFC chip in LPCD mode. The chip is powered with 3.3V supply. The chip takes only 18uA sleep current when powering the chip. It will stay like this till the first card detection. But after first card detection the current goes upto 25 or 35uA and it will not come back to 18uA. The chip comes back to sleep state, but current is high. But if the chip is working with a 3V supply then the chip will come back to its sleep current(18uA) after card detection.  What may be reason? Is it related to the PMU register configuration? Please help me



Midhun V R