RFHCS362AG datasheet(13/60 Pages) MICROCHIP

13 / 60 page

Preliminary

DS41189A-page 13

rfHCS362G/362F

3.0

ENCODER OPERATION

The rfHCS362G/362F will wake-up upon detecting a

switch closure and then delay for switch debounce

(Figure 3-1). The synchronization information, fixed

information and switch information will be encrypted to

form the hopping 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, and a new button 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 trans-

mitting 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:

If multiple buttons are pressed and one

is released, it will not have any effect

on the code word. If no buttons remain

pressed the minimum code words 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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