HCS362-I Datasheet, PDF (5/38 Pages) Microchip Technology – KEELOQ Code Hopping Encoder

2.0 DEVICE DESCRIPTION
As shown in the typical application circuits (Figure 2-1),
the HCS362 is a simple device to use. It requires only
the addition of buttons and RF circuitry for use as the
transmitter in your security application. See Table 2-1
for a description of each pin and Figure 2-1 for typical
circuits. Figure 2-2 shows the device I/O circuits.
TABLE 2-1: PIN DESCRIPTIONS
Name
Pin
Number
Description
S0
1 Switch input 0
S1
2 Switch input 1
S2
3 Switch input 2 / Clock pin when in
Programming mode
S3/
4 Switch input 3 / RF enable output
RFEN
VSS
5 Ground reference connection
DATA
6 Data output pin / DATA I/O pin for
Programming mode
LED/
7 Cathode connection for LED and
SHIFT
DUAL mode SHIFT input
VDD
8 Positive supply voltage
HCS362
FIGURE 2-1: TYPICAL CIRCUITS
VDD
B0
S0
VDD
B1
S1
LED
S2
DATA
S3
VSS
a) Two button remote control
VDD
Tx out
B0
S0
VDD
B1
S1
LED
B2
S2
DATA
B3
S3
VSS
b) Four button remote control
with PLL output (Note)
Tx out
Note:
Up to 15 functions can be implemented by
pressing more than one button simulta-
neously or by using a suitable diode array.
VDD
B3 B2 B1 B0
S0
S1
S2
RFEN
VDD
LED
DATA
VSS
Tx out
c) Four button remote control with RF Enable
PLL control
VDD
B3 B2 B1 B0
S0
VDD
S1 LED/SHIFT
S2
DATA
S3
VSS
d) DUAL key, four buttons remote control
Tx out
1 KW
SHIFT
© 2002 Microchip Technology Inc.
Preliminary
DS40189D-page 5