HCS370_11 MICROCHIP [Microchip Technology], HCS370_11 Datasheet - Page 15

• Manufacturer Part Number: HCS370_11
• Manufacturer: MICROCHIP [Microchip Technology]

FIGURE 4-3:
FIGURE 4-4:
In addition to the Modulation Format, Guard Time, and
Baud Rate, the following options are also available to
change the transmission format:
• If the START/STOP Pulse Enable (STEN) config-
• A wake-up sequence can be transmitted before
• The WAKE option is the same for both Encoder 1
2011 Microchip Technology Inc.
uration option is enabled, the HCS370 will place a
leading and trailing ‘1’ on each code word. This is
necessary for modulation formats such as Man-
chester and PPM to interpret the first and last data
bit.
the transmission starts. The wake-up sequence is
configured with the Wake-up (WAKE) configura-
tion option and can be disabled or set to 50 ms,
75 ms, or 100 ms of pulses as indicated in
Figure 4-5.
and Encoder 2.
1 2
1 2
31xT
VPWM BIT ENCODING:
VARIABLE PULSE WIDTH MODULATION (VPWM)
PULSE POSITION MODULATION (PPM)
31xT
E
50% Preamble
E
50% Preamble
16
16
10xT
10xT
on Transition Low to High
on Transition High to Low
E
E
Header
Header
START bit
Encrypted Portion
T
FIGURE 4-5:
BP
Encrypted Portion
WAKE-UP = 75 ms
WAKE-UP = 50 ms
WAKE-UP = 100 ms
LOGIC "0"
LOGIC "1"
LOGIC “0”
LOGIC “0”
Guard Time = 6.4 ms, 51.2 ms, or 102.4 ms
T
T
WAKE-UP
T
T
2
E
E
BP
X
BP
T
E
WAKE-UP ENABLE
Fixed Code Portion
T
Fixed Code Portion
E
3
CODE
T
T
X TE
T
T
T
E
BP
E
E
E
LOGIC “1”
LOGIC “1”
T
E
T
T
T
T
2T
E
E
BP
E
2
T
E
T
X
BP
G
5T
T
T
E
E
E
CODE
HCS370
DS41111E-page 15
STOP bit
Guard
Time
T
Guard
Time
G