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[v2-11] 2016-Jun-13

AS3911 − Application Information

Figure 118:

ISO14443A States for PCD and PICC

The selection procedure starts when a PICC enters the reader

field and the PCD sends a REQA (or WUPA) command followed

by an Anticollision procedure (incl. SELECT, RATS and PPS).

Setting Up AS3911 for ISO 14443A Anticollision

To setup the AS3911 for the ISO14443A anticollision following

steps are to be followed:

The Initiator operation mode of AS3911 must be setup

for ISO 14443A in the Mode Definition Register (default

is already for ISO14443A).

The Tx and Rx bit rates must be set up to default

106kbit/s in the Bit Rate Definition Register.

PICC States

Power off

(No Field)

Idle

(Field ON)

Ready

REQA, WUPA

Active

Select

RATS

ISO 14443-4

Standby

PCD States

Poll for PICC with

REQA

Receive ATQA

Perform bit frame

Anticollision loop

Check for SAK

Increase Cascade

level

UID not

complete

ISO 14443-4

UID complete &

PICC compliant to ISO 14443-4

AS3911 Datasheet(PDF) 128 Page - ams AG

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