AN2399

ST short-range contactless memories

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5

ST short-range contactless memories

5.1

SR176

ST’s SR176 is an ISO14443 Type B device. It offers 176 bits of EEPROM organized in

eleven 16-bit blocks, a 64-bit UID and an 8-bit Chip_ID. Targeted markets are cost-sensitive

applications such as industrial identification, access control, and low-value tickets that do

not need to be modified more than a few times.

5.2

SRIX4K

ST’s SRIX4K includes 4096 bits of non-volatile memory organized in three areas: the first

area is an OTP (One Time Programmable) bit zone, in which bits can only be switched from

1 to 0; the second area provides two 32-bit binary down counters; and the last area which is

a non-volatile memory split into 32-bit blocks (9 blocks are lockable). The SRIX4K supports

France Telecom’s proprietary anti-clone function and anti-collision mechanism based on an

8-bit Chip_ID.

The SRI4K is based on the SRIX4K, excluding the support of France Telecom’s proprietary

anti-clone function.

5.3

SRIX512

The SRIX512 is a light version of the SRIX4K with 512 bits of non-volatile memory. All three

devices (SRIX4K, SRI4K, SRIX512) are designed for short-range applications such as

consumable products identification, anti-counterfeiting, or high-end ticketing solutions.