HCS200-ISLASHP datasheet(8/34 Pages) MICROCHIP

8 / 34 page

HCS200

DS40138D-page 8

FIGURE 4-1:

CODE WORD FORMAT

FIGURE 4-2:

CODE WORD ORGANIZATION

FIGURE 4-3:

SYNCHRONOUS TRANSMISSION MODE

FIGURE 4-4:

CODE WORD ORGANIZATION (SYNCHRONOUS TRANSMISSION MODE)

LOGIC ‘0’

LOGIC ‘1’

Bit

Period

Preamble

Header

Encrypted Portion

of Transmission

Fixed Portion of

Transmission

Guard

Time

THOP

TFIX

50% Duty Cycle

Fixed

(1-bit)

VLOW

(1-bit)

Button

Status

S2 S1 S0 S3

Serial Number

(28 bits)

Button

Status

S2 S1 S0 S3

Discrimination

bits

(12 bits)

Sync Counter

(16 bits)

Fixed

(1-bit)

VLOW

(1-bit)

Button

Status

1 1 1 1

Serial Number

(28 bits)

SEED

(32 bits)

34 bits of Fixed Portion

32 bits of Encrypted Portion

66 Data bits

Transmitted

LSb first.

LSb

MSb

LSb

SEED replaces Encrypted Portion when all button inputs are activated at the same time.

“01,10,11”

PWM

S[1:0]

TPS TPH1 TPH2

t = 50 ms

Preamble

Header

Data

Reserved

(16 bits)

Padding

(2 bits)

Button

Status

S2 S1 S0 S3

Serial Number

(28 bits)

Button

Status

S2 S1 S0 S3

Discrimina-

tion bits

(12 bits)

Sync Counter

(16 bits)

82 Data bits

Transmitted

LSb first.

LSb

MSb

Fixed Portion

Encrypted Portion

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