© 2011 Microchip Technology Inc. DS21137G-page 23
HCS300
FIGURE 9-3: CODE WORD FORMAT: PREAMBLE/HEADER PORTION
FIGURE 9-4: CODE WORD FORMAT: DATA PORTION
TABLE 9-4: CODE WORD TRANSMISSION TIMING REQUIREMENTS
VDD = +2.0 to 6.0V
Commercial(C):Tamb = 0 °C to +70 °C
Industrial(I):Tamb = -40 °C to +85 °C
Code Words Transmitted
All 1 out of 2 1 out of 4
Symbol Characteristic
Number
of T
E
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Units
T
E
Basic pulse element
1 260 400 660 130 200 330 65 100 165 μs
TBP
PWM bit pulse width
3 780 1200 1980 390 600 990 195 300 495 μs
TP
Preamble duration
23 6.0 9.2 15.2 3.0 4.6 7.6 1.5 2.3 3.8 ms
TH
Header duration
10 2.6 4.0 6.6 1.3 2.0 3.3 0.7 1.0 1.7 ms
THOP
Hopping code duration
96 25.0 38.4 63.4 12.5 19.2 31.7 6.2 9.6 15.8 ms
T
FIX
Fixed code duration
102 26.540.867.313.320.433.7 6.6 10.216.8 ms
TG
Guard Time
39 10.1 15.6 25.7 5.1 7.8 12.9 2.5 3.9 6.4 ms
—
Total Transmit Time
270 70.2 108.0 178.2 35.1 54.0 89.1 17.6 27.0 44.6 ms
—
PWM data rate
— 1282 833 505 2564 1667 1010 5128 3333 2020 bps
Note: The timing parameters are not tested but derived from the oscillator clock.
50% Duty Cycle Preamble Header
P1
P12
23 TE 10 TE Data Bits
Bit 0 Bit 1
Bit 0 Bit 1
Header
Bit 30 Bit 31 Bit 32 Bit 33 Bit 58 Bit 59
Fixed Portion
Encrypted Portion
Guard
LSB
LSB
MSB MSB S3 S0 S1 S2 VLOW RPT
Time
Serial Number Button Code Status
Bit 60
Bit 61
Bit 62 Bit 63 Bit 64 Bit 65
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