14
9152BINDCO02/10
ATA8743
Figure 8-3. Typical FSK Application ATA8743
Note:
FSK Modulation is Achieved by Switching on/off an Additional Capacitor Between the XTAL Load
Capacitor and GND. This is Done Using a MOS Switch Controlled by a Microcontroller Output.
C7
100 nF
100 nF
100 nF
GRM188R71C /
Murata
C8
10 pF
12 pF
12 pF
GRM1885C/
Murata
Q1
9.843750 MHz
13.56 MHz
13.567187 MHz
DSX530GK/
KDS
R1
100 k?/DIV>
100 k?/DIV>
100 k?/DIV>
R2
100 k?/DIV>
100 k?/DIV>
100 k?/DIV>
R3
10 k?/DIV>
10 k?/DIV>
10 k?/DIV>
R4
1.8 k?/DIV>
1.8 k?/DIV>
1.8 k?/DIV>
This resistor can be resigned if the ASK
modulation is performed using PA5 (MISO).
Table 8-1.
Bill of Material (Continued)
Component
Value
Type/
Manufacturer Note
PB0/XTAL1
VDD
PB3/RESET
PB2
PA7
ADC7
PB1/XTAL2
PA1
PA0
13
14
15
16
17
18
6
5
4
3
2
1
20
19
22
21
24
23
11
12
9
10
7
8
PA3/T0
PA4/SCK
PA5/MISO
PA2
C5
VCC
CC
VCC
ATA874x
SW1
SW3
SW2
T1
C9
Q1
C8
C6
C7
R3
R2
R1
C4
C3
C2
L1
L2
C1
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