HCS410 Datasheet, PDF (29/36 Pages) Microchip Technology – KEELOQ CODE HOPPING ENCODER AND TRANSPONDER

HCS410
FIGURE 5-1: POWER UP AND TRANSMIT TIMING
Button Press
Detect
TBP
TTD
TDB
PWM
Code Word Transmission
Code
Word
1
TTO
Code
Word
2
Code
Word
3
Code
Word
n
Sn
TABLE 5-3: POWER UP AND TRANSMIT TIMING REQUIREMENTS
VDD = +2.0 to 6.3V
Commercial (C):Tamb = 0°C to +70°C
Industrial (I): Tamb = -40°C to +85°C
Parameter
Symbol
Min
Typ.
Max
Unit
Remarks
Time to second button press
TBP
34 + Code 38 + Code 42 + Code
ms
Word Time Word Time Word Time
(Note 1)
Transmit delay from button detect
TTD
34.2
38
41.8
ms
(Note 2)
Debounce delay
TDB
27
30
33
ms
Auto-shutoff time-out period
TTO
18
20
22
s
(Note 3)
Time to first LED on
TLST
—
240
—
ms
LED high-time
TLH
—
25
—
ms
LED high-time when battery low
TLHV
—
200
—
ms
LED low-time
TLL
—
480
—
ms
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: Transmit delay maximum value if the previous transmission was successfully transmitted.
3: The auto-shutoff timeout period is not tested.
© 1997 Microchip Technology Inc.
Preliminary
DS40158C-page 29