HCS301_11 Datasheet, PDF (25/38 Pages) Microchip Technology – Microchip Technology Inc. is a code hopping encoder designed for secure

HCS301
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 9-4: 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 TE
Min.
Typ.
Max.
Min.
Typ.
Max.
Min.
Typ.
Max. Units
TE
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
TFIX
Fixed code duration
102 26.5 40.8 67.3 13.3 20.4 33.7 6.6 10.2 16.8 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.
© 2011 Microchip Technology Inc.
DS21143C-page 25