HCS360_01 Datasheet, PDF (20/28 Pages) Microchip Technology – KEELOQ® Code Hopping Encoder

HCS360
FIGURE 8-4: PWM DATA WORD FORMAT
Serial Number
Function Code
Status CRC
LSB
MSB LSB
MSB S3 S0 S1 S2 VLOW CRC0 CRC1
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 Bit 66
Header
Encrypted Data
Fixed Code Data
Guard
Time
FIGURE 8-5:
TE TE
MANCHESTER FORMAT (MANCH = 1)
LOGIC ‘0’
LOGIC ‘1’
TBP
Preamble
TP
Header
TH
Encrypted Portion
of Transmission
THOP
Fixed portion of
Transmission
TFIX
Guard
Time
TG
FIGURE 8-6: MANCHESTER PREAMBLE/HEADER FORMAT
Preamble
Header
Data Word
Transmission
Bit 0 Bit 1
32 TE
4 TE
FIGURE 8-7:
HCS360 NORMALIZED TE VS. TEMP
1.7
Typical
1.6
TE Max.
1.5
1.4
1.3
TE
1.2
1.1
VDD LEGEND
= 2.0V
= 3.0V
= 6.0V
1.0
0.9
0.8
0.7
TE Min.
0.6
-50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
Temperature °C
DS40152D-page 20
 2001 Microchip Technology Inc.