HCS410T-IST datasheet(5/36 Pages) MICROCHIP

Part #	HCS410T-IST

Description	KEELOQ짰 Code Hopping Encoder and Transponder

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Manufacturer	MICROCHIP [Microchip Technology]

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5 / 36 page

HCS410

 2001 Microchip Technology Inc.

Preliminary

DS40158E-page 5

2.0

DEVICE OPERATION

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:

COMBINED TRANSMITTER/

TRANSPONDER CIRCUIT

FIGURE 2-2:

TRANSPONDER CIRCUIT

FIGURE 2-3:

2-WIRE, 1 OR 2-KEY IFF

TOKEN

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:

HCS410 ENCODER WITH 12V

BATTERY

FIGURE 2-5:

LED CONNECTION TO

S2/LED OUTPUT

FIGURE 2-6:

LC PIN BLOCK DIAGRAM

18

RF

2

3

4

7

6

5

1 µF

18

2

3

4

7

6

5

1 µF

18

2

3

4

7

6

5

1 µF

Data I/O

18

RF

2

3

4

7

6

5

6.3V

12V

Pulse

VDD

S2/LED

220

Ω

220

Ω

60k

30

Ω

VDD

6.3V

Damp

Out

MOD

Detector

Rectifier,

Damping,

Clamping

15V

100

Ω

100

Ω

LC1

LC0

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