HCS365 데이터 시트보기 (PDF) - Microchip Technology

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HCS365

KEELOQ® Code Hopping Encoder

Microchip Technology 

HCS365

FIGURE 4-3:

VARIABLE PULSE WIDTH MODULATION (VPWM)

LOGIC “0”

TE

VPWM BIT ENCODING:

on Transition Low to High

on Transition High to Low

TBP

2XTE

LOGIC “0”

TE

LOGIC “1”

TE

TBP

LOGIC “1”

TE TE

12

TBP

TBP

16

2XTE

31xTE 50% Preamble

10xTE Header Encrypted Portion

Fixed Code Portion

Guard

Time

FIGURE 4-4: PULSE POSITION MODULATION (PPM)

TE TE TE

12

LOGIC "0"

LOGIC "1"

START bit

TBP

16

TBP

3 X TE

STOP bit

31xTE 50% Preamble

10xTE Header

Encrypted Portion Fixed Code Portion

Guard

Time

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-

uration option is enabled, the HCS365 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.

• A wake-up sequence can be transmitted before

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.

• The WAKE option is the same for both Encoder 1

and Encoder 2.

FIGURE 4-5: WAKE-UP ENABLE

TE TE

WAKE-UP = 75 ms

TE 2TE

WAKE-UP = 50 ms

TE

5TE

WAKE-UP = 100 ms

TG

TG

WAKE-UP CODE

CODE

Guard Time = 6.4 ms, 51.2 ms, or 102.4 ms

© 2011 Microchip Technology Inc.

DS41109E-page 15

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