Description of the Application Board System

RFID Application Kit ATAK2270 User Manual 3-3

4871E–RFID–04/08
Figure 3-1. Circuit Diagram of the Antenna Interface
C5
CTUNE1
BF820
R18
BAS21
D6
T1
CTUNE2
Components for tuning application
BF820
C8
C6
C7
C9
R9
R10
R11
R17
R16
R21
R19 R20
R22
R3
R13
R14
L2
L1
R12
BAS21
D2
BAS21
D4
BAS21
D5
BAS21
D7
BAS21
12
1
X3
2
3
M14 Antenna
M13
CANT1
Components
for feedback
application
D3
BAV21
D1
R8
R1
X1/6
X2/5
X1/3
X2/10
X2/9
X1/11
X1/7
X2/1
R2
Green
VEXT
VBATT
C3
Power
DZ1
LD1
DVS
COIL1
9
T2
COIL2
INPUT
Data in
M12
M2
Data out
IN OUT
VCC
Red
TUNE2
LD3
R7
Yellow
RFon
LD4
M1 M4 MS
514 15
4
8
11
10
12
OUTPUT
OE
CFE
GND
DGND
HIPASS
2
STANDBY
13
16
7
6
3
1
M15
M11
VS
7808
U2 RF
CANT2
J3
Red
TUNE1
LD2
R15
C4