HCS362-I datasheet(8/38 Pages) MICROCHIP

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HCS362

DS40189D-page 8

Preliminary

3.0

DEVICE OPERATION

The HCS362 will wake-up upon detecting a switch clo-

sure and then delay for switch debounce (Figure 3-1).

The synchronization information, fixed information and

switch information will be encrypted to form the hop-

ping code. The encrypted or hopping code portion of

the transmission will change every time a button is

pressed, even if the same button is pushed again.

Keeping a button pressed for a long time will result in

the same code word being transmitted until the button

is released or time-out occurs.

The time-out time can be selected with the Time-out

(TIMOUT[0..1]) configuration option. This option

allows the time-out to be disabled or set to 0.8 s, 3.2 s

or 25.6 s. When a time-out occurs, the device will go

into SLEEP mode to protect the battery from draining

when a button gets stuck.

If in the transmit process, it is detected that a new but-

ton is pressed, the current code word will be aborted. A

new code word will be transmitted and the time-out

counter will RESET. If all the buttons are released, the

minimum code words will be completed. The minimum

code words can be set to 1,2,4 or 8 using the Minimum

Code Words (MTX[0..1]) configuration option. If the

time for transmitting the minimum code words is longer

than the time-out time, the device will not complete the

minimum code words.

A code that has been transmitted will not occur again

for more than 64K transmissions. This will provide

more than 18 years of typical use before a code is

repeated based on 10 operations per day. Overflow

information programmed into the encoder can be used

by the decoder to extend the number of unique trans-

missions to more than 192K.

FIGURE 3-1:

BASIC FLOW DIAGRAM OF

THE DEVICE OPERATION

Note:

Buttons removed will not have any

effect on the code word unless no but-

tons remain pressed in which case the

current code word will be completed

and the power-down will occur.

START

Sample Buttons

Increment

Seed

Time-out

Encrypt

Yes

Get Config.

TX?

Counter

Transmit

MTX

Buttons

Seed

Time

Read

Seed

STOP

Yes

Seed

Button

New

Buttons

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