Understanding xSIID specs

[LabRat]

Am I right in saying that there are only 2 differences between an xSIID and an NTAG 216:

• the xSIID allows for the addition of an LED
• the xSIID offers 1912 bytes as opposed the NTAG’s 888 bytes

Correct?

[enginerd]

Mostly correct on both points but accessing the additional memory of the xSIID is not straightforward. So for most applications, the only noticeable difference is the LED.

They are different chips and have different capabilities but I’m assuming that you’re planning to use the implant as a business card or something like that.

So what happened with the 2k memory on the xSIID?

TL;DR - The first batch of xSIID made December 2019 were formatted to try to use all 2k of memory across two 1k memory sectors for NFC applications, but the NFC stacks built into Android and iOS phones don’t know how to properly read multiple memory sectors in NFC Type 2 chips. Future batches are formatted to only use the first memory sector which is 1k for NFC applications. The remaining 1k is still readable and writable by phones, but only with a custom smartphone app that can directly address…

[Equipter]

the xsiid has a capability container of 1k which you can use for NDEF, the second kb of storage can be accessed manually but you can’t store ndef in it