AS3911 datasheet(56/159 Pages) AMSCO

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[v2-11] 2016-Jun-13

AS3911 − Application Information

Figure 41:

Bit

Bit Name

Function

Address 02h: Operation Control Register

5rx_chn

1: One channel enabled

→ NFCIP-1 active communication (both initiator and target)

3tx_en

0: Disable TX operation

→ NFCIP-1 active communication (both initiator and target)

Note: In case of any target mode or NFCIP-1 initiator mode bit tx_en is set to 0 to disable transmitter in case it

was enabled. In NFCIP-1 mode the switching on of the transmitter field is controlled by dedicated

commands.

Address 05h: ISO14443A and NFC 106kbit/s Settings Register

5nfc_f0

1: Add SB (F0) and LEN byte during Tx and skip SB (F0) byte during TX

→ NFCIP-1 active

communication (both initiator and target)

Address 09h: Auxiliary Definition Register

5tr_am

Tx Modulation type (depends on mode definition and Tx bit rate)

0: OOK

→ ISO144443A, NFCIP-1 106 kbit/s (both initiator and target), NFC Forum Type 1

Tag

1: AM

→ ISO144443B, FeliCa, NFCIP-1 212 kbit/s and 424 kbit/s

4en_fd

Enable External Field Detector with Peer Detection threshold

0: All modes except NFCIP-1 active communication

1: NFCIP-1 active communication (both initiator and target)

Address 0Ah: Receiver Configuration Register 1

7ch_sel

0: Enable AM channel

→ NFCIP-1 active communication (both initiator and target)

6amd_sel

AM demodulator select (depend on Rx bit rate)

0: Peak detector

→ All Rx bit rates equal or below fc/16 (848 kbit/s)

1: Mixer

→ All VHBR Rx bit rates (fc/8 and fc/4)

5lp2

Low pass control (depends on mode definition and Rx bit rate)

(see Figure 17)

4lp1

3lp0

h200

First and third stage zero setting (depends on mode definition and Rx bit rate)

(see Figure 17)

1h80

0z12k

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