HCS361 Datasheet, PDF (19/24 Pages) Microchip Technology – KEELOQ CODE HOPPING ENCODER

HCS361
FIGURE 8-9:
HCS361 NORMALIZED TE VS. TEMP
1.7
Typical
1.6
1.5
TE Max.
VDD LEGEND
= 2.0V
1.4
= 3.0V
1.3
= 6.0V
TE
1.2
1.1
1.0
0.9
0.8
0.7
TE Min.
0.6
-50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
Temperature °C
TABLE 8-4 CODE WORD TRANSMISSION TIMING PARAMETERS
PWM Mode (TXWAK = 0)
VDD = +2.0 to 6.6V
Commercial (C):Tamb = 0°C to +70°C
Industrial (I):Tamb = -40°C to +85°C
FAST = 0,
TXWAK = 0
Code Words Transmitted
FAST = 1,
TXWAK = 0
Symbol
Characteristic
Number
of TE
Min
Typ.
Max.
Number
of TE
TE
Basic pulse element
1
260 400 620
1
TBP
PWM bit pulse width
3
780 1200 1860
3
TP
Preamble duration
28
7.3 11.2 17.4
28
TH
Header duration
10
2.6 4.0 6.2
10
THOP Hopping code duration
96
25.0 38.4 59.5
96
TFIX
Fixed code duration
105
27.3 42.0 65.1
105
TG
Guard Time
16
4.2 6.4 9.9
32

Total Transmit Time
255
66.3 102.0 158.1 271

PWM data rate

1282 833 538

Note: The timing parameters are not tested but derived from the oscillator clock.
Min.
130
390
3.6
1.3
12.5
13.7
4.2
35.2
2564
Typ.
200
600
5.6
2.0
19.2
21.0
6.4
54.2
1667
Max.
310
930
8.7
3.1
29.8
32.6
9.9
84.0
1075
Units
µs
µs
ms
ms
ms
ms
ms
ms
bps
PWM Mode (TXWAK = 1)
VDD = +2.0 to 6.6V
Commercial (C):Tamb = 0°C to +70°C
Industrial (I):Tamb = -40°C to +85°C
FAST = 0,
TXWAK = 1
Code Words Transmitted
FAST = 1,
TXWAK = 1
Symbol
Characteristic
Number
of TE
Min
Typ.
Max.
Number
of TE
TE
Basic pulse element
1
130 200 310
1
TBP
PWM bit pulse width
6
780 1200 1860
6
TP
Preamble duration
28
3.6 5.6 8.7
28
TH
Header duration
10
1.3 2.0 3.1
10
THOP Hopping code duration
192
25.0 38.4 59.5
192
TFIX
Fixed code duration
210
27.3 42.0 65.1
210
TG
Guard Time
32
4.2 6.4 9.9
64

Total Transmit Time
472
61.4 94.4 146.3 504

PWM data rate
—
1282 833 538
—
Note: The timing parameters are not tested but derived from the oscillator clock.
Min. Typ. Max. Units
65 100 155 µs
390 600 930 µs
1.8 2.8 4.3 ms
0.7 1.0 1.6 ms
12.5 19.2 29.8 ms
13.7 21.0 32.6 ms
4.2 6.4 9.9 ms
32.8 50.4 78.1 ms
2564 1667 1075 bps
© 1996 Microchip Technology Inc.
Preliminary
DS40146C-page 19