PIC16F636T-I Datasheet, PDF (104/234 Pages) Microchip Technology – 8/14-Pin, Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC12F635/PIC16F636/639
FIGURE 11-3:
BIDIRECTIONAL PASSIVE KEYLESS ENTRY (PKE) SYSTEM APPLICATION EXAMPLE
LED
UHF
Receiver
LF
Transmitter/
Receiver
EnCcroydpetesd
Re(sUpHonFs) ^e
LF(1C2o5mkmHazn) ^d
Ant. X
Ant. Y
LF Talk-Back
(125 ^kHz)
Ant. Z
LED
UHF
Transmitter
PIC16F639
MCU
(PIC16F636)
+
3 Input
Analog Front-End
Base Station
Transponder
FIGURE 11-4:
PASSIVE KEYLESS ENTRY (PKE) TRANSPONDER CONFIGURATION EXAMPLE
315 MHz
RF Circuitry
(UHF TX)
+3V
+3V
VDD
1
S0
2
S1
3
S2
4
Data
5
RFEN
6
LFDATA/RSSI/CCLK/SDIO
7
VDDT
8
LCX
9
LCY
10
air-core
coil
ferrite-core
coil
VSS
20
S3
19
S4
18
S5
17
LED
16
CS
15
SCLK/ALERT
14
VSST
13
LCCOM
12
LCZ
11
ferrite-core
coil
+3V +3V
DS41232D-page 102
© 2007 Microchip Technology Inc.