The xSIID is a next generation NFC compliant implant which leverages the SIID, an innovative OEM module design from Dsruptive. The module houses both an NTAG I2C NFC chip and an LED indicator tied to the energy harvesting pins of the NTAG I2C. This design ensures the LED does not interfere with operation of the NFC chip and always receives filtered power output regardless of field variance. The xSIID comes in a variety of colors and offers the 2kB version (1912 user bytes) of the NTAG I2C chip!
WARNING
At the moment there is a problem writing NDEF data to the xSIID. The NTAG I2C chip used in the SIID module has 2kB of memory, split into two large memory sectors. The problem is that the NTAG I2C chip is not commonly used by consumers, and at the moment there are no apps available that properly identify and write to the entire user memory. Smaller data sets which remain within the 1kB range (the first memory sector) tend to succeed, however larger data which must extend into the second memory sector will fail. We are working with NXP now to fix bugs in their TagWriter application to ensure at least TagWriter will be able to properly write data to all 2kB user memory. Other options such as NFC Tools also exhibit bugs and other issues attempting to write data, particularly large NDEF records.
this is so exciting!! definitely going to get this for my first implant. now thereās no need to worry about two chips touching!
now to decide on a colorā¦
Damn, I know itās out of your hands with it being their guts to the chips and new partnership, but its a shame in this day and age that some people still consider a blue LED to be āfancierā than a red or amber.
Great work on bringing these to market in a safe way!
just out of curiosity, is there a difference in brightness/light size between this and the xLED?
additionally, do they operate in the same way as a xLED and a xNT would if implanted next to each other?
Brightness is somewhat dimmerā¦ but not by much. Itās a function of having to share power with the NFC chip off the same inductor (antenna). Coincidentally the brightness follows the pricingā¦ green is the brightest while amber is the dimmest, yet amber is still clearly visible under lighter skin.
Yes you can have an xLED next to an xSIID (with approx 5mm between for safety).
Actually itās the other way aroundā¦ the LED gets power first, then the NFC chip fires upā¦ so when approaching a reader the LED typically lights before the reader talks to the chip.
Doesnāt the LED rob power when it would be needed by the chip when the fieldās strength is borderline - in other words, doesnāt it decrease the range then? Or is it just not a problem in practice?
If you had an LED in parallel with the chip on the inductor then this would be the likely outcome, but the NTAG I2C chip has a power conditioner circuit ahead of the transponder circuit and this is where the energy harvesting output comes from, so the LED gets power first.
Sorryā¦ brain is tired and messages are coming in fast with new announcementā¦ basically youāre correctā¦ the chip itself gets slightly less range due to the LED on boardā¦ but itās a minimal depreciation.
To further clarify, the performance of the LED and chip together in the NTAG I2C is a better outcome than an LED in parallel with an NFC chip with no power conditioningā¦ but again since weāre dealing with tiny implantables the % delta results in very small physical differences. The differences are much more pronounced with a full size ISO card antennaā¦ like this;
I guess it works well enough, else you wouldnāt put it up for sale But yeah, since the same coil powers two things instead of one, thereās gotta be a tradeoff, however inconsequential in practice.
I remember some discussion in the xGLO thread about transmission of light through skin - it seems like the red and amber would transmit more readily than the green or blue.
Of course, everyoneās skin and installation depth is different, but speaking really generally here, do you think the extra brightness of the green LED will compensate for its absorption by the skin?
In other words, if we want to optimize for āin-vivo brightness,ā which color should we pick?
Omg i been waiting for something with a light that does more than just lights up. You said it was coming and well here it is. I will be ordering as soon as i get back in town. I need to figure out location now.
But yeah, since the same coil powers two things instead of one, thereās gotta be a tradeoff, however inconsequential in practice.