PIC16F639 Microchip Technology Inc., PIC16F639 Datasheet - Page 104

• Manufacturer Part Number: PIC16F639
• Description: 8/14-pin Flash-based, 8-bit Cmos Microcontrollers With Nanowatt Technology
• Manufacturer: Microchip Technology Inc.

PIC12F635/PIC16F636/639
FIGURE 11-3:
FIGURE 11-4:
DS41232D-page 102
315 MHz
RF Circuitry
(UHF TX)
Base Station
Transmitter/
+3V
Receiver
Receiver
BIDIRECTIONAL PASSIVE KEYLESS ENTRY (PKE) SYSTEM APPLICATION EXAMPLE
LED
PASSIVE KEYLESS ENTRY (PKE) TRANSPONDER CONFIGURATION EXAMPLE
UHF
LF
air-core
coil
+3V
LFDATA/RSSI/CCLK/SDIO
RFEN
V
Data
V
LCX
LCY
ferrite-core
DDT
S0
S1
S2
DD
coil
1
2
3
4
5
6
7
8
9
10
Ant. X
Ant. Y
Ant. Z
13
12
20
19
18
17
16
15
14
11
ferrite-core
coil
SCLK/ALERT
V
S3
S4
S5
LED
CS
V
LCCOM
LCZ
SS
SST
© 2007 Microchip Technology Inc.
Analog Front-End
(PIC16F636)
Transmitter
Transponder
PIC16F639
3 Input
MCU
UHF
+
+3V
LED
+3V