hcs301 Microchip Technology Inc., hcs301 Datasheet - Page 21

• Manufacturer Part Number: hcs301
• Description: Keeloq Code Hopping Encoder
• Manufacturer: Microchip Technology Inc.

FIGURE 8-4:
FIGURE 8-5:
TABLE 8-4:
Note:
Symbol
Header
T
2001 Microchip Technology Inc.
T
T
Commercial(C):Tamb = 0 °C to +70 °C
T
T
T
HOP
T
—
—
FIX
Industrial(I):Tamb = -40 °C to +85 °C
BP
E
P
H
G
The timing parameters are not tested but derived from the oscillator clock.
Hopping code duration
LSB
Bit 0 Bit 1
Basic pulse element
PWM bit pulse width
Fixed code duration
Total Transmit Time
V
Preamble duration
Header duration
Encrypted Portion
DD
Characteristic
PWM data rate
Guard Time
= +2.0 to 6.0V
CODE WORD TRANSMISSION TIMING REQUIREMENTS
P1
CODE WORD FORMAT: PREAMBLE/HEADER PORTION
CODE WORD FORMAT: DATA PORTION
Bit 30 Bit 31 Bit 32 Bit 33 Bit 58 Bit 59
23 T
MSB
E
Number
50% Duty Cycle Preamble
of T
102
270
23
10
96
39
—
1
3
LSB
E
Serial Number
1282
Min.
25.0
26.5
10.1
70.2 108.0 178.2 35.1
260
780
6.0
2.6
1200 1980
Typ.
40.8
38.4
15.6
400
833
All
9.2
4.0
Max.
15.2
63.4
67.3
25.7
660
505
MSB
6.6
Fixed Portion
P12
Bit 60 Bit 61 Bit 62 Bit 63 Bit 64 Bit 65
Code Words Transmitted
2564 1667 1010 5128 3333 2020
Min.
12.5
13.3
130
390
S3
3.0
1.3
5.1
10 T
1 out of 2
Button Code
S0
Typ.
19.2
20.4
54.0
200
600
4.6
2.0
7.8
E
Header
S1
Max.
31.7
33.7
12.9
89.1
330
990
7.6
3.3
S2
Min.
17.6
195
0.7
6.2
6.6
2.5
1.5
65
Bit 0 Bit 1
V
Data Bits
1 out of 4
LOW
HCS301
Status
Typ.
10.2
27.0
100
300
2.3
1.0
9.6
3.9
DS21143B-page 21
RPT
Max. Units
15.8
16.8
44.6
165
495
3.8
1.7
6.4
Guard
Time
bps
ms
ms
ms
ms
ms
ms
s
s