mfrc631 chips break down during normal operation

[zbigniewkalisia]

Hello

Many mfrc631 chips on my antenna board break down (burn out) during normal operation (Mifare card reading) without external stimuli. Is it possible that with properly designed hardware the software could damage the chip? Where should I look firstly for problems : hardware / software ? What could be the reason?

I noticed that powerdown signal is very sensitive and when stay not connected it quickly leads to damage.

Regards

Zbigniew Kalisiak

[vicentegomez]

Did you check that there is not a solder short under the devic?.

Did you perform an ICT test?

[zbigniewkalisia]

I very detailed checked PCB soldering and there is no shorts. I use other older MIFARE chips without any problem and I've never burn it on PCB.

[vicentegomez]

What happend if you put a new device on the PCB?