ST25DV64KC datasheet(127/203 Pages) STMICROELECTRONICS

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The Wt time is equal to t1nom + N × 302 µs (N is an integer). After a successful write, the new value of the

selected password is automatically activated. It is not required to present the new password value until the

ST25DVxxKC power-down.

Caution:

If ST25DVxxKC is powered through VCC, removing VCC during Write Password command can abort the

command. As a consequence, before writing a new password, RF user should check if VCC is ON, by reading

EH_CTRL_Dyn register bit 3 (VCC_ON), and eventually ask host to maintain or to shut down VCC, during the

Write Password command in order to avoid password corruption.

To make the application more robust, it is recommended to use addressed or selected mode during write

password operations to get the traceability of which tags/UID have been programmed

Table 210. Write Password request format

Request

SOF

Request_flags

Write

password

IC Mfg code

UID (1)

Password

number

Data

CRC16

Request

EOF

8 bits

B1h

02h

64 bits

8 bits

64 bits

16 bits

1. This field is optional.

Request parameter:

•

Request flags

•

UID (optional)

•

Password number:

–

00h = RF configuration password RF_PWD_0,

–

01h = RF_PWD_1,

–

02h = RF_PWD_2,

–

03h = RF_PWD_3,

–

other = Error

•

Data

Table 211. Write Password response format when Error_flag is NOT set

Response SOF

Response_flags

CRC16

Response EOF

8 bits

16 bits

Response parameter:

•

no parameter.

Table 212. Write Password response format when Error_flag is set

Response SOF

Response_flags

Error code

CRC16

Response EOF

8 bits

16 bits

Response parameter:

•

Error code as Error_flag is set:

–

02h: command not recognized

–

03h: command option not supported

–

10h: the password number is incorrect

–

12h: update right not granted, Present Password command not previously executed successfully

–

13h: the specified block was not successfully programmed

ST25DV04KC ST25DV16KC ST25DV64KC

RF commands

DS13519 - Rev 3

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