AS3909 datasheet(35/77 Pages) AMSCO

35 / 77 page

ams Datasheet, Confidential: 2013-Oct [3-02]

AS3909/AS3910 – 35

Appl icatio n I n f o rm a t i o n

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.

Figure 23:

Operation Control Register

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.

2rx_rate2

rx_rate2

rx_rate1

rx_rate0

bit rate

Selects ISO-14443 data rate for

receive, Applicable in case nfc=0

1rx_rate1

106kb/s

0rx_rate0

212kb/s

424kb/s

848kb/s

RFU

Address # 01: Operation Control Register

Type: RW

Bit

Name

Def.

Function

Comments

7en

en=1 enables oscillator and regulator

(Ready mode)

Is internally ORed with the EN

rx_en

rx_en=1 enables receiver operation

rx_lp

rx_lp=1 low power receiver operation

Receive consumption is

reduced

tx_en

tx_en=1 enables RF output

nfc_t

nfc_t =1 enables Initial NFC Target mode

At the moment RF field is

detected, interrupt is sent.

Not used

Address # 00: ISO Mode Definition Register

Type: RW

Bit

Name

Def.

Function

Comments

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