HCS200_11 Datasheet, PDF (22/34 Pages) Microchip Technology – KEELOQ® Code Hopping Encoder 32-bit hopping code

HCS200
FIGURE 9-4:
CODE WORD FORMAT: PREAMBLE/HEADER PORTION
P1
P12
Bit 0 Bit 1
23 TE 50% Duty Cycle Preamble
10 TE Header
Data Bits
FIGURE 9-5:
CODE WORD FORMAT: DATA PORTION
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 Encrypted Portion
Fixed Portion
Guard
Time
TABLE 9-3: CODE WORD TIMING
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.
TE
TBP
TP
TH
THOP
TFIX
TG
—
—
Basic pulse element
PWM bit pulse width
Preamble duration
Header duration
Hopping code duration
Fixed code duration
Guard Time
Total Transmit Time
PWM data rate
1
280 400 620 140
3
840 1200 1860 420
23
6.4 9.2 14.3 3.2
10
2.8 4.0 6.2 1.4
96
26.9 38.4 59.5 13.4
102
28.6 40.8 63.2 14.3
39
10.9 15.6 24.2 5.5
270
75.6 108.0 167.4 37.8
—
1190 833 538 2381
Note: The timing parameters are not tested but derived from the oscillator clock.
Typ.
200
600
4.6
2.0
19.2
20.4
7.8
54.0
1667
Max.
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
DS40138D-page 22
© 2011 Microchip Technology Inc.