HCS410 Datasheet, PDF (30/36 Pages) Microchip Technology – KEELOQ CODE HOPPING ENCODER AND TRANSPONDER

HCS410
FIGURE 5-2:
HCS410 NORMALIZED TE VS. TEMP
1.10
1.08
TE Max.
1.06
1.04
TE ^1.02
1.00
0.98
0.96
0.94
0.92
TE Min.
0.90
-50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
Temperature °C
Note: Values are for calibrated oscillator.
Typical
VDD LEGEND
= 2.0V
= 3.0V
= 6.0V
TABLE 5-4: CODE WORD TRANSMISSION TIMING PARAMETERS—PWM 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.
TE
Basic pulse element
1
360
400
440
TBP
PWM bit pulse width
3
1080 1200 1320
TP
Preamble duration
32
12
12.8
14
TH
Header duration
10
3.6
4.0
4.4
THOP Code hopping duration 96
35
38.4
42
TFIX
Fixed code duration
111
39.96 44.4 48.84
TG
Guard time
46
16.6 18.4 20.2
—
Total transmit time
295
106.2 118.0 129.8
Note: The timing parameters are not tested but derived from the oscillator clock.
Number
of TE
1
3
32
10
96
111
46
295
Min.
180.0
540.0
5.76
1.80
17.28
19.98
8.3
53.1
Typ.
200.0
600.0
6.0
2.0
19.20
22.20
9.6
59.0
Max.
220.0
660.0
7.04
2.20
21.12
24.42
10.1
64.9
Units
µs
µs
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 = 0,
BSL0 = 1
Symbol
Characteristic
Number
of TE
Min.
Typ.
Max.
TE
Basic pulse element
1
180.0 200.0 220.0
TBP
PWM bit pulse width
3
540.0 600.0 660.0
TP
Preamble duration
32
5.76
6.0
7.04
TH
Header duration
10
1.80
2.0
2.20
THOP Code hopping duration
96
17.28 19.20 21.12
TFIX
Fixed code duration
111
19.98 22.2 24.42
TG
Guard time
46
8.3
9.6
10.1
—
Total transmit time
295
53.1 59.0 64.9
Note: The timing parameters are not tested but derived from the oscillator clock.
Number
of TE
1
3
32
10
96
111
46
295
Min.
90.0
270.0
2.88
0.90
8.64
9.99
41
26.6
Typ.
100.0
300.0
3.0
1.0
9.60
11.1
4.6
29.5
Max.
110.0
330.0
3.52
1.10
10.56
12.21
5.1
32.5
Units
µs
µs
ms
ms
ms
ms
ms
ms
DS40158C-page 30
Preliminary
© 1997 Microchip Technology Inc.