HCS412_11 Datasheet, PDF (17/52 Pages) Microchip Technology – KEELOQ® Code Hopping Encoder and Transponder Burglar alarm systems

HCS412
TABLE 3-9: ENCODER TIMING SPECIFICATIONS
VDD = +2.0 to 6.6V
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
44 + Code 58 + Code 63 + Code ms
Word Time Word Time Word Time
Note 1
Transmit delay from button detect
TTD
20
30
40
ms
Note 2
Debounce delay on button press
TDBP
14
20
26
ms
Debounce delay on button release
TDBR
20
ms
Auto-shutoff time-out period
TTO
18
20
22
s
Note 3
Long preamble
TLPRE
64
ms
LED on time
TLEDON
32
ms
Note 4
LED off time
TLEDOFF
480
ms
Note 4
LED on time (VDD < VLOW Trip Point) TLEDL
200
ms
Note 5
Time to delayed SEED
TDSD
3
s
transmission
Queue Time
TQUE
30
ms
Note 1: TBP is the time in which a second button can be pressed without completion of the first code word where 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 time-out period is not tested.
4: The LED times specified for VDD > VTRIP specified by VLOW in the configuration word.
5: LED on time if VDD < VTRIP specified by VLOW in the configuration word.
© 2011 Microchip Technology Inc.
DS41099D-page 17