HCS410_11 Datasheet, PDF (34/46 Pages) Microchip Technology – KEELOQ® Code Hopping Encoder and Transponder 2-bit CRC, 2-bit queue

HCS410
TABLE 6-5: 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
TP
TH
TSTART
THOP
TFIX
TSTOP
TG
Basic pulse element
Preamble duration
Header duration
Start bit
Code hopping duration
Fixed code duration
Stop bit
Guard time
1
720.0 800.0 880.0
1
32
23.04 25.60 28.16
32
4
2.88 3.20 3.52
4
2
1.44 1.60 1.76
2
64
46.08 51.20 56.32
64
74
53.28 59.20 65.12
74
2
1.44 1.60 1.76
2
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
1
360.0 400.0 440.0
1
TP Preamble duration
32
11.52 12.80 14.08
32
TH Header duration
4
1.44 1.60 1.76
4
TSTART Start bit
2
0.72 0.80 0.88
2
THOP Code hopping duration
64
23.04 25.60 28.16
64
TFIX Fixed code duration
74
26.64 29.60 32.56
74
TSTOP Stop bit
2
0.72 0.80 0.88
2
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 6-3: 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
DS40158F-page 34
© 2011 Microchip Technology Inc.