AS3911 datasheet(54/149 Pages) AMSCO

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AS3911 – 54

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

Mask Receive Data and Unmask Receive Data

After the direct command Mask Receive Data the signal rx_on,

which enables the RSSI and AGC operation of the Receiver (see

also Receiver) is forced to low, processing of the receiver output

by the receive data framing block is disabled. This command is

useful to mask receiver and receive framing from processing

the data when there is actually no input and only a noise would

be processed (for example in case where a transponder

processing time after receiving a command from the reader is

long). Masking of receive is also possible using Mask Receive

Timer. Actual masking is a logical or of the two mask receive

processes.

Address 09h: Auxiliary Definition Register

5tr_am

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

0: OOK

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

Tag

1: AM

→ ISO144443B, FeliCa, NFCIP-1 212 kb/s and 424 kb/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 kb/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 15)

4lp1

3lp0

2h200

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

(see Figure 15)

1h80

0z12k

Address 0Ch: Receiver Configuration Register 3

1lim

Clip output of 1st and 2nd stage

0: All modes except NFCIP-1 active communication

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

0rg_nfc

Forces gain reduction in 2nd and 3rd gain stage

0: All modes except NFCIP-1 active communication

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

Bit

Bit Name

Function

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