HCS301_11 Datasheet, PDF (24/38 Pages) Microchip Technology – Microchip Technology Inc. is a code hopping encoder designed for secure

HCS301
FIGURE 9-2:
POWER-UP AND TRANSMIT TIMING
Button Press
Detect
TBP
Multiple Code Word Transmission
TTD
TDB
PWM
Output
Code
Word
1
Code
Word
2
Code
Word
3
Code
Word
4
Code
Word
n
TTO
Button
Input
Sn
TABLE 9-3: 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
TBP Time to second button press
10 + Code 26 + Code
ms
Word
Word
(Note 1)
TTD Transmit delay from button detect
10
26
ms
TDB Debounce Delay
6
15
ms
TTO Auto-shutoff time-out period
20
120
s
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 9-3:
CODE WORD FORMAT
TE TE TE
LOGIC ‘0’
LOGIC ‘1’
Bit Period
TBP
50% Duty Cycle
Preamble
TP
Header
TH
Encrypted Portion
of Transmission
THOP
Fixed Portion of
Transmission
TFIX
Guard
Time
TG
DS21143C-page 24
© 2011 Microchip Technology Inc.