HCS410-IP Microchip Technology, HCS410-IP Datasheet - Page 6

• Manufacturer Part Number: HCS410-IP
• Description: KEELOQ CODE HOPPING ENCODER AND TRANSPONDER
• Manufacturer: Microchip Technology

HCS410
2.0
The HCS410 can either operate as a normal code hop-
ping transmitter with one or two IFF keys (Figure 2-1) or
as purely an IFF token with two IFF keys (Figure 2-2
and Figure 2-3). When used as a code hopping trans-
mitter the HCS410 only needs the addition of buttons
and RF circuitry for use as a transmitter. Adding the
transponder function to the transmitter requires the
addition of an inductor and two capacitors as shown in
Figure 2-1 and Figure 2-2. A description of each pin is
given in Table 2-1. Table 2-2 shows the function codes
for using the HCS410.
FIGURE 2-1:
FIGURE 2-2:
FIGURE 2-3:
DS40158C-page 6
DEVICE OPERATION
1
2
3
4
1
2
3
4
1
2
3
4
COMBINED TRANSMITTER/
TRANSPONDER CIRCUIT
TRANSPONDER CIRCUIT
2-WIRE, 1 OR 2-KEY IFF
TOKEN
8
7
6
5
8
7
6
5
8
7
6
5
Data I/O
1 F
1 F
1 F
RF
Preliminary
Figure 2-4 shows how to use the HCS410 with a 12V
battery as a code hopping transmitter. The circuit uses
the internal regulator, normally used for charging a
capacitor/battery in LC mode, to generate a 6V supply
for the HCS410.
FIGURE 2-4:
FIGURE 2-5:
FIGURE 2-6:
12V
LCI1
LCI0
220
220
100
100
15V
15V
HCS410 ENCODER WITH 12V
BATTERY
LED CONNECTION TO
S2/LED OUTPUT
LC PIN BLOCK DIAGRAM
1
2
3
4
S2/LED
1997 Microchip Technology Inc.
8
7
6
5
Detector
Rectifier,
Damping,
Clamping
6.3V
V
DD
30
60k
Pulse
6.7V
Damp
Out
MOD
V
RF
DD