ST25TV02K datasheet(22/90 Pages) STMICROELECTRONICS

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5.10

Tamper detect

5.10.1

Tamper detect register

Tamper detection

Table 24. TAMPER_DETECT

Bit

Command

Read Cfg (cmd code A0h) @5h

Type

Name

Function

Factory value

TAMPER_DETECT

State of Tamper:

0: loop is open. Tamper is detected

1: loop is closed. No tamper is detected

b7-b1

RFU

000000b

Note:

Refer to Table 4. System configuration memory map accessible through write_cfg and read_cfg commands for

the TAMPER_DETECT register.

5.10.2

Tamper detection description

The Tamper detection allows to check the shortage between the 2 TD0 and TD1 pins of the ST25TV02K/512.

This state TAMPER_DETECT is captured by ST25TV02K/512 each time that the ST25TV02K/512 are powered

and available upon demand by the reader using the Read Cfg command with CFG_ID 5. (Tamper detection)

This information will be lost during power off. (No permanent storage of the status.)

This is the customer responsibility to check the register status and behave accordingly.

The short impedance should be less than 50 Ω.

The tamper detect feature is available for the ST25TV02K/512-AD devices only. On other configurations, a Read

Cfg of the Tamper Detection register will return an error code.

If the two inputs pins TD0, TD1 are shorted with a wire at the time RF field is turned on, the tamper register will

have a value “1”. If TD0, TD1 are not shorted at the time RF field is turned on, the tamper register will have a

value “0”.

5.11

Device parameter registers

Table 25. LOCK_DSFID

Bit

Command

Lock DSFID (cmd code 2Ah)

Type

WO if DSFID not locked

Name

Function

Factory value

LOCK_DSFID

0: DSFID is not locked

1: DSFID is locked

b7-b1

RFU

0000000b

Note:

Refer to Table 5. System configuration memory map for registers accessed through dedicated commands for the

LOCK_DSFID register.

Table 26. LOCK_AFI

Bit

Command

Lock AFI (cmd code 28h)

ST25TV02K ST25TV512

Tamper detect

DS12074 - Rev 11

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