I developed a custom card reader for contact and contactless smart card, this card reader is expected to run in an outdoor environment and with a temperature up to 70°C
I have issues when the ambient temperature goes over 50°C with contact cards.
The issues are :
- ATR is corrupted or
- During APDU exchanges, frames are corrupted.
The NXP data sheet says the PN7462 should work up to 85°C
The firmware of the reader comes from the NXP example PN7462AU_ex_phExCcid where the 2 temperature sensors of the PN7462 are disabled.
Does anyone met similar issues? Any idea ?