HCS410 Datasheet, PDF (31/36 Pages) Microchip Technology – KEELOQ CODE HOPPING ENCODER AND TRANSPONDER

HCS410
TABLE 5-5: CODE WORD TRANSMISSION TIMING PARAMETERS—MANCHESTER MODE
VDD = +2.0V to 6.3V
Commercial (C): Tamb = 0°C to +70°C
Industrial (I): Tamb = -40°C to +85°C
BSL1 = 0,
BSL0 = 0
Code Words Transmitted
BSL1 = 0,
BSL0 = 1
Symbol
Characteristic
Number
of TE
Min.
Typ.
Max.
Number
of TE
TE Basic pulse element
1
720.0 800.0 880.0
1.0
TP
TH
TSTART
THOP
TFIX
TSTOP
TG
Preamble duration
Header duration
Start bit
Code hopping duration
Fixed code duration
Stop bit
Guard time
32
23.04 25.60 28.16 32.0
4
2.88 3.20 3.52
4.0
2
1.44 1.60 1.76
2.0
64
46.08 51.20 56.32 64.0
74
53.28 59.20 65.12
74
2
1.44 1.60 1.76
2.0
32
23.0 25.6 28.2
32
— Total transmit time
210
151.2 168 184.8
210
Note: The timing parameters are not tested but derived from the oscillator clock.
Min.
360.0
11.52
1.44
0.72
23.04
26.64
0.72
11.5
75.6
Typ.
400.0
12.80
1.60
0.80
25.60
29.60
0.80
12.8
84.0
Max.
440.0
14.08
1.76
0.88
28.16
32.56
0.88
14.1
92.4
Units
µs
ms
ms
ms
ms
ms
ms
ms
ms
VDD = +2.0V to 6.3V
Commercial (C): Tamb = 0°C to +70°C
Industrial (I): Tamb = -40°C to +85°C
BSL1 = 1,
BSL0 = 0
Code Words Transmitted
BSL1 = 1,
BSL0 = 1
Symbol
Characteristic
Number
of TE
Min.
Typ.
Max.
Number
of TE
TE Basic pulse element
TP Preamble duration
TH Header duration
1
360.0 400.0 440.0
1.0
32
11.52 12.80 14.08 32.0
4
1.44 1.60 1.76
4.0
TSTART
THOP
TFIX
TSTOP
Start bit
Code hopping duration
Fixed code duration
Stop bit
2
0.72 0.80 0.88
2.0
64
23.04 25.60 28.16 64.0
74
26.64 29.60 32.56
74
2.0
0.72 0.80 0.88
2.0
TG Guard time
32
11.5 12.8 14.1
32
— Total transmit time
210
75.6 84.0 92.4
210
Note: The timing parameters are not tested but derived from the oscillator clock.
Min.
180.0
5.76
0.72
0.36
11.52
13.32
0.36
5.8
37.8
Typ.
200.0
6.40
0.80
0.40
12.80
14.8
0.40
6.4
42.0
Max. Units
220.0 µs
7.04 ms
0.88 ms
0.44 ms
14.08 ms
16.28 ms
0.44 ms
7.0
ms
46.2 ms
FIGURE 5-3:
TYPICAL VOLTAGE TRIP POINTS
Volts (V)
5.0
4.8
4.6
4.4
4.2
4.0
3.8
2.8
2.6
2.4
2.2
2.0
1.8
1.6
-40
VLOW
VLOW sel = 1
VLOW sel = 0
0
50 85 ^{Temp (C)}
Legend
Nominal VLOW trip point
© 1997 Microchip Technology Inc.
Preliminary
DS40158C-page 31