HCS362-ISLASHST datasheet(7/38 Pages) MICROCHIP

7 / 38 page

Preliminary

DS40189D-page 7

HCS362

FIGURE 2-4:

HCS362 VLOW DETECTOR

(TYPICAL)

FIGURE 2-5:

HCS362 VLOW DETECTOR

(TYPICAL)

The output of the low voltage detector is transmitted in

each code word, so the decoder can give an indication

to the user that the transmitter battery is low. Operation

of the LED changes as well to further indicate that the

battery is low and needs replacing.

2.2

Dual Encoder Operation

The HCS362 contains two crypt keys (possibly derived

from two different Manufacturer’s Codes), but only one

Serial Number, one set of Discrimination bits, one 16-

bit Synchronization Counter and a single 60-bit Seed

value. For this reason the HCS362 can be used as an

encoder in multiple (two) applications as far as they

share the same configuration: transmission format,

baud rate, header and guard settings. The SHIFT input

pin (multiplexed with the LED output) is used to select

between the two crypt keys.

A logic 1 on the SHIFT input pin selects the first crypt

key.

A logic 0 on the SHIFT input pin will select the second

crypt key.

1.5

1.7

1.9

2.1

2.3

2.5

2.7

-40

-25

-10

Temperature (°C)

VDD Legend

= 000

= 001

= 010

= 011

Temperature (°C)

3.5

3.7

3.9

4.1

4.3

4.5

4.7

4.9

5.1

5.3

5.5

-40

-25

-10

VDD Legend

= 000

= 001

= 010

= 011

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