topic Re: Dynamic Lock Bytes for NT3H2111 is off by 4 bytes? in NFC

Dynamic Lock Bytes for NT3H2111 is off by 4 bytes?

yanqil — Wed, 16 Oct 2024 21:33:12 GMT

The datasheet for The NT3H2111 shows the Dynamic lock bytes as starting at offset 4 on page 0x38. However, in practice, setting bytes 4, 5, and 6 did not lock pages 16 and above. Instead, writing to bytes 8, 9, and 10 did the trick. I am wondering if this was a mistake in the datasheet or did we get a batch of chips that has the incorrect address for the dynamic lock bytes?

Re: Dynamic Lock Bytes for NT3H2111 is off by 4 bytes?

KaiLi — Thu, 17 Oct 2024 02:17:33 GMT

Hello @yanqil

Dynamic Lock Bytes should be a bit difference between 1K version and 2K. What you used should be 2k version, so bytes8,9 and 10 are Dynamic Lock Bytes. But for 1K version, bytes4,5 and 6 are Dynamic Lock Bytes. Please check the below screenshot for the details.