NFC Write to NT3H2111

hitesh_jetwani — Fri, 08 Jan 2021 10:21:39 GMT

I am using NT3H2211-2k with an esp 8266
i am able to read and write using I2c and i can ensure the data is actually committed using NXP TagInfo /TagWriter but i cant write using NFC and as mentioned in Datasheet (AN12364),to avoid Conflict i have powered down the I2C master ,Still no cigar i have tried multiple apps and have got no positive response

Re: NFC Write to NT3H2111

ukcas — Tue, 05 Oct 2021 07:50:33 GMT

Dear Hitesh,

Please check 3.2.4 "Why is it not possible to write a NDEF message with TagWriter?" in NTAG I²C plus - FAQs.

In general:

1.) Applications shall use FD pin (interrupt) functionalities - to determine presence of NFC field. µC is notified when NFC field comes in and shall immediately stop any access to NTAG's I²C EEPROM access.

2.) Access from I²C side shall always check for RF_LOCKED to be 0b before accessing (Read/Write) NTAG's EEPROM.

3.) Access to EEPROM from I²C shall be as fast as possible and shall happen less frequent (e.g. every 1s)

Best regards,

uksac

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NFC Write to NT3H2111

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