RFHCS362F Datasheet, PDF (9/60 Pages) Microchip Technology – Code Hopping Encoder with UHF ASK/FSK Transmitter

2.0 DEVICE DESCRIPTION
The block diagram in Figure 2-1 shows the internal
configuration with the top half representing the encoder
and the bottom half the UHF transmitter. Note that con-
nections between the encoder and transmitter are
made external to the device for more versability.
Typical application circuits are shown in Figure 1-5 and
Figure 1-6. The rfHCS362G/362F requires only the
addition of push button switches and few external com-
ponents for use as a transmitter in your security appli-
cation. See Table 2-1 for pinout description. Figure 2-2
shows the device I/O circuits.
rfHCS362G/362F
FIGURE 2-1: rfHCS362 BLOCK DIAGRAM
Oscillator
RESET Circuit
LED
LED Driver
RFEN
PLL Driver
Controller
Power
Latching
and
Switching
DATA
VSS
VDD
EEPROM
Encoder
32-bit Shift Register
SHIFT
Button Input Port
S3 S2 S1 S0
RFENIN
Mode
Control
Logic
FSK Switch
DATAFSK ⁽¹⁾
FSKOUT ⁽¹⁾
CLKOUT
VDDRF
VSSRF
Divide
by 4
Fixed
Divide
by 32
Crystal
Oscillator
XTAL
Phase
Detector
and
Charge Pump
LF
Voltage
Controlled
Oscillator
(VCO)
PS/DATAASK
Power
Amplifier
(PA)
Note 1: rfHCS362F only.
ANT2 ANT1
© 2002 Microchip Technology Inc.
Preliminary
DS41189A-page 9