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AS3953A − Detailed Description

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 AS3953A.

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.

SAK

SAK is response to SELECT command. AS3953A UID has double

size, which defines SAK responses for Cascade Level 1 and

Cascade Level 2.

Cascade Level 1: According to ISO 14443-3, all bits except b3

are “don’t care” for Cascade Level 1. Figure below defines

Cascade Level 1 coding.

Figure 16:

Cascade Level1 Coding

b16

b15

b14

b13

b12

b11

b10

00000

UID size

Bit frame anti-collision

MSB

LSB

Description

000

Cascade bit set: UID not

complete

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