HCS362_11 MICROCHIP [Microchip Technology], HCS362_11 Datasheet - Page 8

• Manufacturer Part Number: HCS362_11
• Manufacturer: MICROCHIP [Microchip Technology]

HCS362
3.0
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
(
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 (
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.
DS40189E-page 8
TIMOUT
Note:
DEVICE OPERATION
[
0..1
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.
MTX
]) configuration option. This option
[
0..1
]) configuration option. If the
FIGURE 3-1:
No
No
No
Sample Buttons
Get Config.
Increment
Time-out
Counter
Transmit
Buttons
Encrypt
Buttons
START
Seed
Seed
Time
MTX
BASIC FLOW DIAGRAM OF
THE DEVICE OPERATION
New
TX?
No
No
Yes
No
No
Yes
No
© 2011 Microchip Technology Inc.
Yes
Yes
Yes
Yes
STOP
Button
Seed
Seed
No
Read
Yes