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