AS3911 datasheet(68/149 Pages) AMSCO

68 / 149 page

AS3911 – 68

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

Figure 47:

Bit Rate Coding

Note:

In case a bit rate which is not supported is selected, the Tx/Rx operation is disabled.

ISO14443A and NFC 106kb/s Settings Register

Figure 48:

ISO14443A and NFC 106kb/s Settings Register

Note:

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

Bit Rate Coding

rate3

rate2

rate1

rate0

Bit rate [kbit/s]

Comment

fc/128 (~106)

fc/64 (~212)

fc/32 (~424)

fc/16 (~848)

fc/8 (~1695)

VHBR Tx is supported only for ISO14443B

mode

VHBR Rx is supported only for fc/8 and fc/4

fc/4 (~3390)

fc/2 (~6780)

Other combinations

Not used

Address 05h: ISO14443A and NFC 106kb/s

Settings Register

Type: RW

Bit

Name

Default

Function

Comments

no_tx_par

1: No parity bit is

generated during Tx

Data stream is taken from FIFO, transmit has to be

done using command Transmit Without CRC

no_rx_par

1: Receive without

parity and CRC

When set to 1 received bit stream is put in the

FIFO, no parity and CRC detection is done

5nfc_f0

1: Support of NFCIP-1

Transport Frame format

Add SB (F0) and LEN bytes during Tx and skip SB

(F0) byte during Rx

4p_len3

Refer to ISO14443A

Modulation Pulse

Width

Modulation pulse width; defined in number of

13.56 MHz clock periods.

3p_len2

2p_len1

1p_len0

0antcl

1: ISO14443

anticollision frame

Has to be set to 1 when ISO14443A bit oriented

anticollision frame is sent

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