hcs301 Microchip Technology Inc., hcs301 Datasheet - Page 20

• Manufacturer Part Number: hcs301
• Description: Keeloq Code Hopping Encoder
• Manufacturer: Microchip Technology Inc.

HCS301
FIGURE 8-2:
TABLE 8-3:
FIGURE 8-3:
DS21143B-page 20
V
Commercial(C): Tamb = 0°C to +70°C
Industrial(I): Tamb = -40°C to +85°C
DD
Symbol
Note 1: T
Button
T
T
T
T
Input
Output
= +3.5 to 13.0V
Sn
PWM
BP
TD
DB
TO
2: Typical values - not tested in production.
Button Press
Detect
intention was to press the combination of buttons.
Time to second button press
Transmit delay from button detect
Debounce Delay
Auto-shutoff time-out period
BP
50% Duty Cycle
is the time in which a second button can be pressed without completion of the first code word and the
POWER-UP AND TRANSMIT TIMING
Preamble
T
E
Bit Period
POWER-UP AND TRANSMIT TIMING
CODE WORD FORMAT
T
P
T
T
T
E
BP
DB
T
E
Parameter
T
TD
LOGIC ‘0’
LOGIC ‘1’
T
BP
Header
T
H
Encrypted Portion
of Transmission
Code
Word
1
T
HOP
T
10 + Code
TO
(2)
Multiple Code Word Transmission
Word
Min
Code
Word
10
20
6
2
26 + Code
Code
Word
Fixed Portion of
Transmission
Word
Max
3
120
26
15
T
FIX
Code
Word
4
2001 Microchip Technology Inc.
Unit
ms
ms
ms
s
Guard
Time
T
Code
Word
G
n
Remarks
(Note 1)