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AS3910

Data Sheet - A p p l i c a t i o n I n f o r m a t i o n

8.11.1 Main Registers

Note:

In case nfc=1, then both transmit and receive data rates are set to 106kbps independent of TX and RX setting. Default setting is set at

power up and after Set Default command.

Note:

Receive low power operation sacrifices the input sensitivity for low consumption. If Rx consumption is reduced from 10mA to 5mA, then

a 10mA reader operation is possible. Default setting is set at power up and after Set Default command.

Table 10. ISO Mode Definition Register

Address # 00: ISO Mode Definition Register

type: RW

Bit

Name

Def.

Function

Comments

7nfc

0

1=NFC, 0=ISO-14443

NFC means NFCIP-1,

106 kbps active communication mode

6b_a

0

1=ISO-14443B, 0=ISO-14443A

Applicable in case nfc=0

5tx_rate2

0

tx_rate2

tx_rate1

tx_rate0

bit rate

Selects ISO-14443 data rate for transmit,

Applicable in case nfc=0

4

tx_rate1

0

0

0

0

106kb/s

3tx_rate0

0

0

0

1

212kb/s

0

1

0

424kb/s

0

1

1

848kb/s

1x

x

RFU

2rx_rate2

0

rx_rate2

rx_rate1

rx_rate0

bit rate

Selects ISO-14443 data rate for receive,

Applicable in case nfc=0

1

rx_rate1

0

0

0

0

106kb/s

0rx_rate0

0

0

0

1

212kb/s

0

1

0

424kb/s

0

1

1

848kb/s

1x

x

RFU

Table 11. Operation Control Register

Address # 01: Operation Control Register

type: RW

Bit

Name

Def.

Function

Comments

7en

0

en=1 enables oscillator and regulator (Ready

mode)

Is internally ORed with the EN pin

6rx_en

0

rx_en=1 enables receiver operation

5rx_lp

0

rx_lp=1 low power receiver operation

Receive consumption is reduced

4

tx_en

0

tx_en=1 enables RF output

3nfc_t

0

nfc_t =1 enables Initial NFC Target mode

At the moment RF field is detected, interrupt is

sent.

2

Not used

1

0