HCS200 Datasheet, PDF (15/16 Pages) Microchip Technology – KEELOQ CODE HOPPING ENCODER

HCS200
FIGURE 8-5: DATA WORD FORMAT
Serial Number
Button Code
Status
LSB
MSB LSB
MSB S3 S0 S1 S2 VLOW RPT
Bit 0 Bit 1 Bit 30 Bit 31 Bit 32 Bit 33 Bit 58 Bit 59 Bit 60 _{Bit 61} Bit 62 Bit 63 Bit 64 Bit 65
Header Hopping Code Word
Fixed Code Word
Guard
Time
TABLE 8-4: CODE WORD TRANSMISSION TIMING REQUIREMENTS
VDD = +3.5 to 13.0V
Commercial (C): Tamb = 0°C to +70°C
Industrial (I): Tamb = -40°C to +85°C
Code Words Transmitted
All
1 out of 2
Symbol
Characteristic
Number
of TE
Min.
Typ.
Max.
Min.
Typ.
Max.
TE Basic pulse element
1
280 400 620 140
TBP PWM bit pulse width
3
840 1200 1860 420
TP Preamble duration
23
6.4 9.2 14.3 3.2
TH Header duration
10
2.8 4.0 6.2 1.4
THOP Hopping code duration
96
26.9 38.4 59.5 13.4
TFIX Fixed code duration
102
28.6 40.8 63.2 14.3
TG Guard Time
39
10.9 15.6 24.2 5.5
— Total Transmit Time
270
75.6 108.0 167.4 37.8
— PWM data rate
—
1190 833 538 2381
Note: The timing parameters are not tested but derived from the oscillator clock.
200
600
4.6
2.0
19.2
20.4
7.8
54.0
1667
310
930
7.1
3.1
29.8
31.6
12.1
83.7
1075
Units
µs
µs
ms
ms
ms
ms
ms
ms
bps
FIGURE 8-6: HCS200 TE VS. TEMP (BY CHARACTERIZATION)
1.7
1.6
1.5
TE Max.
1.4
VDD = 3.5V
1.3
1.2
TE
1.1
1.0
0.9
VDD = 5.0V
Typical
0.8
VDD ≥ 5.0V
0.7
TE Min.
0.6
-50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
TEMPERATURE °C
© 1996 Microchip Technology Inc.
Preliminary
DS40138A-page 15