HCS301 datasheet(25/38 Pages) MICROCHIP

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DS21143C-page 25

HCS301

FIGURE 9-4:

CODE WORD FORMAT: PREAMBLE/HEADER PORTION

FIGURE 9-5:

CODE WORD FORMAT: DATA PORTION

TABLE 9-4:

CODE WORD TRANSMISSION TIMING REQUIREMENTS

VDD = +2.0 to 6.0V

Commercial(C):Tamb = 0 °C to +70 °C

Industrial(I):Tamb = -40 °C to +85 °C

Code Words Transmitted

All

1 out of 2

1 out of 4

Symbol

Characteristic

Number

of TE

Min.

Typ. Max. Min.

Typ. Max. Units

Basic pulse element

260

400

660

130

200

330

100

165

μs

TBP

PWM bit pulse width

780

1200 1980

390

600

990

195

300

495

μs

Preamble duration

6.0

9.2

15.2

3.0

4.6

7.6

1.5

2.3

3.8

Header duration

2.6

4.0

6.6

1.3

2.0

3.3

0.7

1.0

1.7

THOP

Hopping code duration

25.0

38.4

63.4

12.5

19.2

31.7

6.2

9.6

15.8

TFIX

Fixed code duration

102

26.540.867.313.320.433.7

6.6

10.2

16.8

Guard Time

10.1

15.6

25.7

5.1

7.8

12.9

2.5

3.9

6.4

—

Total Transmit Time

270

70.2 108.0 178.2 35.1

54.0

89.1

17.6

27.0

44.6

—

PWM data rate

—

1282

833

505

2564 1667 1010 5128 3333 2020

bps

Note:

The timing parameters are not tested but derived from the oscillator clock.

50% Duty Cycle Preamble

Header

P12

23 TE

10 TE

Data Bits

Bit 0 Bit 1

Header

Bit 30 Bit 31 Bit 32 Bit 33 Bit 58 Bit 59

Fixed Portion

Encrypted Portion

Guard

LSB

MSB

MSB S3

VLOW RPT

Time

Serial Number

Button Code

Status

Bit 60 Bit 61 Bit 62 Bit 63 Bit 64 Bit 65

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