AS3909 Datasheet, PDF (35/77 Pages) ams AG – 13.56 MHz RFID Reader IC, ISO-14443 A/B

Application Information
Address # 00: ISO Mode Definition Register
Type: RW
Bit Name Def.
Function
Comments
2 rx_rate2 0 rx_rate2 rx_rate1 rx_rate0 bit rate
1 rx_rate1 0
0
0
0
106kb/s
0
0
1
212kb/s _{Selects ISO-14443 data rate for}
receive, Applicable in case nfc=0
0
1
0
424kb/s
0 rx_rate0 0
0
1
1
848kb/s
1
x
x
RFU
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
Address # 01: Operation Control Register
Type: RW
Bit Name Def.
Function
Comments
7
en
6 rx_en
5
rx_lp
4 tx_en
3
nfc_t
2
1
0
0
en=1 enables oscillator and regulator
(Ready mode)
Is internally ORed with the EN
pin
0 rx_en=1 enables receiver operation
0 rx_lp=1 low power receiver operation
Receive consumption is
reduced
0 tx_en=1 enables RF output
0
nfc_t =1 enables Initial NFC Target mode
At the moment RF field is
detected, interrupt is sent.
Not used
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.
ams Datasheet, Confidential: 2013-Oct [3-02]
AS3909/AS3910 – 35