SL2S3003FUD datasheet(47/82 Pages) NXP

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NXP Semiconductors

SL2S3003/SL2S3003TT

ICODE 3 (TagTamper)

8.5.3.9 ENABLE PRIVACY

Command code = BAh

The ENABLE PRIVACY command sets the ICODE 3 Label IC to Privacy mode, if the Privacy password is

correct. In the Privacy mode, the ICODE 3 is not traceable by its UID nor by the data stored in the user memory.

The two privacy modes of ICODE 3 are defined with the PRIVACY_MODE_SEL bit (see Table 34) in the

configuration memory,and with the WRITE CONFIG command.

• Privacy mode 1

In privacy mode 1, the ICODE 3 does not respond to any command except GET RANDOM NUMBER and

SET PASSWORD.

• Privacy mode 2

In privacy mode 2, the ICODE 3 responds to an Inventory command with the UID 0x E0 04 00 00 00 00 00 00.

The IC reference in Get System Information command response is changed to 0x00.

ICODE 3 labels in privacy mode 2 only support the following commands:

– INVENTORY

– SELECT

– STAY QUIET

– GET SYSTEM INFORMATION

– PICK RANDOM ID

– SET PASSWORD

– GET RANDOM NUMBER

– STAY QUIET PERSISTANT

– RESET TO READY

– READ SINGLE BLOCK

– READ MULTIPLE BLOCKS

Read access to data from the user memory depends on the read password protection settings.

With the command PICK_RANDOM_ID (Section 8.5.3.24 "PICK RANDOM ID"), the ICODE 3 generates a

random ID to respond to the inventory commands and to support the anti-collision feature. The random ID

includes the CID to identify the group-key to disable the privacy mode.

The XOR password must be calculated with the password and twice the received random number from the last

GET RANDOM NUMBER command:

XOR_Password[31:0] = Password[31:0] XOR {Random_Number[15:0], Random_Number[15:0]}.

To get out of the Privacy status, the valid Privacy password must be transmitted to the IC with the SET

PASSWORD command.

The timing of the command is write alike.

SOF

Flags

ENABLE

PRIVACY

IC Mfg code UID

XOR password

CRC16

EOF

8 bits

64 bits optional

32 bits

16 bits

Table 78. ENABLE PRIVACY request format

SOF

Flags

Error code

CRC16

EOF

8 bits

16 bits

Table 79. ENABLE PRIVACY response format when Error_flag set

SL2S3003/SL2S3003TT

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Product data sheet

Rev. 3.0 — 28 March 2024

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