SL2S3003 datasheet(29/82 Pages) NXP

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NXP Semiconductors

SL2S3003/SL2S3003TT

ICODE 3 (TagTamper)

8.2.3.1.2 NFC counter

If the 24-bit counter is configured as an NFC counter, at each start of the IC, the label IC automatically

increases the 24-bit counter value. In the NFC counter mode, the start-up time of the reader device must

comply with the NFC Forum Tag 5 Type specification .

Once the NFC counter has reached the maximum value of FF FF FF hex, the NFC counter value does not

change anymore.

The NFC counter is enabled or disabled with the COUNTER_MODE bit in the configuration memory bit. See

Table 36 in Section 8.2.3.

To read the NFC counter value, use either a read command to block 75 or NFC counter mirror feature.

If the counter is configured as NFC counter, the counter is incremented every time the tag is tapped by an NFC

device or other read point. Due to response time constraints in ISO/IEC 15693 [1], the increment is done at

start-up and not at the first read access to the user memory. A circuit that preserves its state over HF resets

prevents further increments of the NFC counter until a read of the user memory is executed.

To ensure that the NFC counter is also incremented in situations where the tag slowly enters the HF field

(typically in long range systems), the label IC retries to increment the counter at start-up multiple times. To

optimally adapt to the application, two options are available with the NFC_RETRY_MODE bit:

NFC_RETRY_

MODE

Number of

retries

Time between

retries

Total retry

period

Recommended usage

4.8 ms

> 77 ms

default (for most applications)

9.6 ms

> 614 ms

Applications where the label enters the field very

slow

Table 46. NFC_RETRY_MODE request format

If all the retries fail, the counter returns 0x00 00 00 to indicate that the counter had not been increased. For the

TagTamper version, the same retry mechanism is used for the stored TagTamper status. If all the retries fail, the

stored TagTamper status is reported as “E”.

SL2S3003/SL2S3003TT

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Product data sheet

Rev. 3.0 — 28 March 2024

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