topic CARD emulation PN7160 Serial number in MCX Microcontrollers

CARD emulation PN7160 Serial number

awn — Tue, 15 Jul 2025 10:57:36 GMT

Hello,

I am currently working on card emulation with PN7160, connected to an ESP32.
When I tap the PN7160 to an Android NFC reader (using NFC Tools), the emulated card is detected. However, I notice that the UID changes on each tap, except for the first byte, which is always 08.

Example UIDs I observed:

08467004
0886036e
08c7351f
0831fb0d
...

My question is:
Is it possible to configure a fully custom static UID (e.g., fixed 4-byte UID like "0456789A") when using card emulation mode on the PN7160?
Any insights or guidance would be greatly appreciated!

Re: CARD emulation PN7160 Serial number

EduardoZamora — Thu, 17 Jul 2025 21:05:38 GMT

Hi @awn,

Hope you are doing well.

In Card Emulation mode, UID can be a random number, and only one byte would be fixed. In this configuration, UID will change every time there is an RF Off -> RF On transition (each tap).

I will recommend you checking PN7160/PN7220 configuration files, Section 5.8 NXP_HCE_RNDM_UID_ENB for more information.

Regards,
Eduardo.

Re: CARD emulation PN7160 Serial number

awn — Tue, 22 Jul 2025 08:20:33 GMT

Hi @EduardoZamora ,

Thank you very much for your explanation and for pointing me to the NXP_HCE_RNDM_UID_ENB configuration. That clarifies the behavior I observed during testing.

I appreciate your support!

Best regards,
AWN