RFPIC12F675K Datasheet, PDF (54/136 Pages) Microchip Technology – 20-Pin FLASH-Based 8-Bit CMOS Microcontroller with UHF ASK/FSK Transmitter

rfPIC12F675
FIGURE 9-5: TYPICAL ASK TRANSMITTER SCHEMATIC
C3
0.1 µF
X1
C1
R1
C1 can be shorted
R1 can be omitted
+V
C4
100 pF
1
VDD
VSS ²⁰
2
GP5/T1CKI/OSC1/CLKIN
GP0/AN0/CIN+/ICSPDAT ¹⁹
3
18
GP4/AN3/T1G/OSC2/CLKOUT
4
GP1/AN1/CIN-/VREF/ICSPCLK ₁₇
5 ^GP3/MCLR/VPP
GP2/AN2/T0CKI/INT/COUT
16
RFXTAL
6
FSKOUT ₁₅
RFENIN
DATAFSK
7
14
CLKOUT
DATAASK
8
13
PS
LF
9
VDDRF
10 _VSSRF
U1
rfPIC12F675K
12
VSSRF ₁₁
ANT
+V
C5
100 pF
+V
BT1
+
CR2032
- 3V Lithium Cell
L1
120 nH
R2
4.7 kΩ
C6
5 pF
C7
4 pF
SW2
SW1
Loop Antenna
FIGURE 9-6: TYPICAL FSK TRANSMITTER SCHEMATIC
C3
0.1 µF
X1
13.55 MHz
C1
39 pF
R1
220 kΩ
+V
C4
100 pF
1
2 ^VDD
GP5/T1CKI/OSC1/CLKIN
VSS ²⁰
GP0/AN0/CIN+/ICSPDAT ¹⁹
3
18
4 ^{GP4/AN3/T1G/OSC2/CLKOUT}
GP1/AN1/CIN-/VREF/ICSPCLK ₁₇
GP3/MCLR/VPP
GP2/AN2/T0CKI/INT/COUT
5
16
RFXTAL
FSKOUT
6
15
7 ^RFENIN
DATAFSK ₁₄
8 ^CLKOUT
DATAASK ₁₃
PS
LF
9
VDDRF
U1
12
VSSRF
10 _VSSRF
rfPIC12F675K
ANT ¹¹
C2
1000 pF
+V
L1
120 nH
C5
100 pF
+V
R2
4.7 kΩ
+
BT1
CR2032
- 3V Lithium Cell
C6
5 pF
C7
4 pF
+V
SW2
SW1
Loop Antenna
DS70091A-page 52
Preliminary
 2003 Microchip Technology Inc.