AS3909 datasheet(40/77 Pages) AMSCO

40 / 77 page

AS3909/AS3910 – 40

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

A p pl i c at io n I n f o r m at i o n

Figure 28:

Receiver Configuration Register

Note: Default setting is set at power up and after Set Default command, filter selection bits are preset also when ISO mode or receive

data rate change.

Address # 06: Receiver Configuration Register

Type: RW

Bit

Name

Def.

Function

Comments

agc_en

→ AGC is enabled

AGC operation

mode

agc_m

→ AGC operate on first eight subcarrier pulses

→ AGC operate during complete receive period

5rg2

rg2

rg1

rg0

Gain reduction

Gain reduction in

3dB steps. From 0

to 21dB.

4rg1

3rg0

3 dB

21 dB

2fs2

fs2

fs1

fs0

Filter

Selection

Comment

Filter selection is

automatically set

when ISO mode

or receive data

rate change

(Change of ISO

mode definition

automatic preset

filter, selection

can be changed

by writing these

bits.

1fs1

ISO-14443A

106 kb/s

Automatic

preset

0fs0

ISO-14443B

106 kb/s

Automatic

preset

ISO-14443A/

B 212 kb/s

Automatic

preset

ISO-14443A/

B 424 kb/s

Automatic

preset

ISO-14443A/

B 848 kb/s

Automatic

preset

424/484 kHz

subcarriers

automatic

preset

212 kHz

automatic

preset

Other combinations not

supported or used for block

testing purposes

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