© 1996 Microchip Technology Inc.

Preliminary

DS21143A-page 17

HCS301

FIGURE 8-5:

DATA WORD FORMAT

TABLE 8-4:

CODE WORD TRANSMISSION TIMING REQUIREMENTS

FIGURE 8-6:

HCS301 TE VS. TEMP (BY CHARACTERIZATION ONLY)

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

Min.

Typ.

Max.

Min.

Typ.

Max.

Min.

Typ.

Max. Units

Basic pulse element

1

280

400

620

140

200

310

70

100

155

µs

PWM bit pulse width

3

840

1200

1860

420

600

930

210

300

465

µs

Preamble duration

23

6.4

9.2

14.3

3.2

4.6

7.1

1.6

2.3

3.6

ms

Header duration

10

2.8

4.0

6.2

1.4

2.0

3.1

0.7

1.0

1.6

ms

Hopping code duration

96

26.9

38.4

59.5

13.4

19.2

29.8

6.7

9.6

14.9

ms

Fixed code duration

102

28.6

40.8

63.2

14.3

20.4

31.6

7.1

10.2

15.8

ms

Guard Time

39

10.9

15.6

24.2

5.5

7.8

12.1

2.7

3.9

6.0

ms

—

Total Transmit Time

270

75.6

108.0 167.4

37.8

54.0

83.7

18.9

27.0

41.9

ms

—

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.

Bit 0

Bit 1

Header

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

Fixed Code Word

Hopping Code Word

Guard

LSB

LSB

MSB

MSB

S3

S0

S1

S2

VLOW RPT

Time

Serial Number

Button Code

Status

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

0.8

1.7

1.6

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.7

-50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90

0.6

TE

TEMPERATURE

≥ 5.0V

≥ 5.0V

Typical