HCS320 datasheet(22/32 Pages) MICROCHIP

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HCS320

DS41097C-page 22

FIGURE 8-5:

CODE WORD FORMAT: PREAMBLE/HEADER PORTION

FIGURE 8-6:

CODE WORD FORMAT: DATA PORTION

TABLE 8-3:

CODE WORD TRANSMISSION TIMING REQUIREMENTS

VDD = +3.5 to 13.0

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.

Min.

Typ.

Max. Units

Basic pulse element

280

400

620

140

200

310

100

155

µs

TBP

PWM bit pulse width

840

1200

1860

420

600

930

210

300

465

µs

Preamble duration

6.4

9.2

14.3

3.2

4.6

7.1

1.6

2.3

3.6

Header duration

2.8

4.0

6.2

1.4

2.0

3.1

0.7

1.0

1.6

THOP

Hopping code duration

26.9

38.4

59.5

13.4

19.2

29.8

6.7

9.6

14.9

TFIX

Fixed code duration

102

28.6

40.8

63.2

14.3

20.4

31.6

7.1

10.2

15.8

Guard Time

199

55.6

79.6

123.5

28.1

39.8

61.7

13.8

19.9

30.6

—

Total Transmit Time

430

120.3 172.0

266.7

60.4

86.0

133.3

29.9

43.0

66.5

—

PWM data rate

—

1190

833

538

2381

1667

1075

4762

3333

2151

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

Bit 0

Bit 1

Header

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

Fixed Portion

Encrypted Portion

Guard

LSB

MSB

VLOW RPT

Time

Serial Number

Button Code

Status

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

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