hcs320 Microchip Technology Inc., hcs320 Datasheet - Page 21

• Manufacturer Part Number: hcs320
• Description: Keeloq Code Hopping Encoder
• Manufacturer: Microchip Technology Inc.

FIGURE 8-2:
FIGURE 8-3:
FIGURE 8-4:
V
Commercial (C): Tamb = 0°C to +70°C
Industrial
Time to second button press
Transmit delay from button detect
Debounce delay
Auto-shutoff time-out period
Note 1: T
DD
2001 Microchip Technology Inc.
Button
Input
Output
= +3.5 to13.0V
Sn
PWM
2: The Auto-shutoff time-out period is not tested.
intention was to press the combination of buttons.
Button Press
Detect
BP
(I): Tamb = -40°C to +85°C
is the time in which a second button can be pressed without completion of the first code word and the
50% Duty Cycle
Parameter
Preamble
T
E
Bit Period
POWER-UP AND TRANSMIT TIMING
POWER-UP AND TRANSMIT TIMING REQUIREMENTS
CODE WORD FORMAT
T
P
T
T
T
E
BP
DB
T
E
T
TD
LOGIC ‘0’
LOGIC ‘1’
T
BP
Header
T
H
Symbol
T
T
T
T
Encrypted Portion
BP
TD
DB
TO
of Transmission
Code
Word
1
T
HOP
T
Word Time
10 + Code
TO
Multiple Code Word Transmission
Min
Code
Word
10
22
6
2
Word Time
27 + Code
Code
Word
Fixed Portion of
Transmission
Max
3
27
15
77
T
FIX
Code
Word
4
Unit
ms
ms
ms
s
Guard
HCS320
Time
T
Code
Word
G
DS41097C-page 21
n
Remarks
(Note 1)
(Note 2)