AS3911 datasheet(74/149 Pages) AMSCO

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AS3911 – 74

ams Datasheet, Confidential: 2013-Oct [2-03]

A p pl i c at io n I n f o r m at i o n

Auxiliary Definition Register

Figure 56:

Auxiliary Definition Register

Note(s) and/or Footnote(s):

1. Default setting is set at power-up and after Set Default command.

2. Receive without CRC is done automatically in case REQA and WUPA commands are sent using direct commands Transmits REQA

command and Transmits WUPA command, respectively, and in case anticollision is performed by setting bit antcl.

3. Automatic preset of the tr_am

4. 0: OOK ® ISO144443A, NFCIP-1 106 kb/s, NFC Forum Type 1 Tag

5. 1: AM ® ISO144443B, FeliCa, NFCIP-1 212 and 424 kb/s

Address 09h: Auxiliary Definition Register

Type: RW

Bit

Name

Default

Function

Comments

7no_crc_rx

1: Receive without CRC

Valid for all protocols, for

ISO14443A REQA, WUPA and

anticollision receive without CRC

is done automatically (2)

6crc_2_fifo

1: Make CRC check, but put

CRC bytes in FIFO and add

them to number of receive

bytes

Needed for EMV compliance

5tr_am

0: OOK, 1: AM

Set automatically by command

Analog Preset, can be modified

by register write, has to be

defined for transparent and bit

stream mode Tx (3)

4en_fd

1: Enable External Field

Detector

External Field Detector with Peer

Detection threshold is activated.

Preset for NFCIP-1 active

communication mode

3ook_hr

1: Puts RFO driver in

three-state during OOK

modulation

Valid for all protocols using OOK

modulation (also in Transparent

mode)

2rx_tol

1: BPSK fc/32: more tolerant

BPSK decoder for bit rate fc/32,

ISO14443A fc/128, NFCIP-1

fc/128: more tolerant

processing of first byte

nfc_n1

Definition on n for direct

commands NFC Initial Field ON

and NFC Response Field ON

0nfc_n0

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