SL3S1205FUD2SLASHHAP datasheet(23/38 Pages) NXP

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NXP Semiconductors

SL3S1205_15

UCODE 8/8m

9.6.3 Self Adjust

9.6.3.1 Description

The UCODE 8/8m has an automatic mechanism implemented which adjusts the chip

sensitivity to a maximum in the operated environment. This adjustment will be performed

at startup and selects between three different input capacitance values. The feature is

enabled by default, but can also be deactivated by the config word bit 207h (Self Adjust

disable). In case of deactivation, the center capacitance is used.

The indicator bits 205h (Self Adjust Cap 1) and 206h (Self Adjust Cap 0) give information

which capacitor is active ("1"). The startup is performed with the lowest value which is

center capacitance minus Cap 0 (60 fF) and is then adjusted up to center capacitance

plus Cap 1 (100 fF).

9.6.4 Brand Identifier

9.6.4.1 Description

This new feature allows brand owners to implement a product originality check option

for their products. The customer dedicated unique 16-bit brand identifier is programmed

during manufacturing process by NXP and therefore unalterable stored in the memory.

A SELECT command on bit 204h (Brand identifier) in the configuration word triggers the

UCODE8/8m to respond in the inventory round with PC + EPC + Brand Identifier + CRC.

In order to prevent manipulation, the Brand Identifier is scrambled with the RN16 and

not sent in plain. The implemented scrambling is performed by bitwise XOR operation

of the 16-bit Brand Identifier and the RN16. At the reader, the Brand identifier can be

descrambled and the originality check completed.

The PC value is adjusted accordingly for UCODE 8/8m. A SELECT on the Brand

Identifier bit always gives a Tag matching.

The usage of this feature requires an update on the reader firmware with the Brand

Identifier check routine.

Default value of the UCODE 8/8m Brand Identifier is "AAAAh". Customer-specific Brand

Identifiers can be requested by a dedicated product ordering code. For details, contact

your NXP sales representative.

The Brand Identifier feature cannot be used in combination with the EPC+TID feature.

SL3S1205_15

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3.5 — 1 April 2021

COMPANY PUBLIC

398435

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SL3S1205FUD2/HAP Datasheet(PDF) 23 Page - NXP Semiconductors