AS3953B datasheet(15/64 Pages) AMSCO

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ams Datasheet

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[v1-04] 2016-Jan-07

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AS3953B − Detailed Description

The last 4 bytes of UID are read from EEPROM (UID word).Figure

below defines the last four bytes of UID.

Figure 14:

Coding of Last Four Bytes of UID

Coding of ATQA, SAK and ATS

Several bits of responses ATQA, SAK and ATS are defined as

“don’t care” in the ISO 14443A standard. Some others are

defined by optional choices in standard protocol. This section

defines how these bits are set by the AS3953B.

ATQA

ATQA is response to REQA and WUPA commands. Figure below

defines the ATQA coding.

Figure 15:

ATQA Coding

Bits b16 to b13 are RFU bits which must be set to ‘0’.

Bits b12 to b9 are proprietary coding and are set to ‘0’.

Bits b8 and b7 indicate double size UID.

Bit b6 is ‘RFU’ bit and is set to ‘0’.

For bit frame anti-collision, the code 00100 is chosen.

UID Byte

UID Word Bits

uid3

b7-b0

uid4

b15-b8

uid5

b23-b16

uid6

b31-b24

b16

b15

b14

b13

b12

b11

b10

0000000

1000100

UID size

Bit frame anti-collision

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