Rainbow-electronics DS18B20 Manual de usuario descargar pdf (Pagina 12)

DS18B20

12 of 20

ROM COMMANDS FLOW CHART Figure 11

CCh

SKIP ROM

COMMAND

MASTER T

X

RESET PULSE

DS18B20 T

X

PRESENCE

PULSE

MASTER T

X

ROM

COMMAND

33h

READ ROM

COMMAND

55h

MATCH ROM

COMMAND

F0h

SEARCH ROM

COMMAND

ECh

A

LARM SEARCH

COMMAND

MASTER T

X

BIT 0

DS18B20 T

X

BIT 0

DS18B20 T

X

BIT 0

MASTER T

X

BIT 0

BIT 0

MATCH?

MASTER T

X

BIT 1

BIT 1

MATCH?

BIT 63

MATCH?

MASTER T

X

BIT 63

N

Y

Y Y Y

Y

N N

N

N

N

N

N

Y

Y

Y

DS18B20 T

X

BIT 1

DS18B20 T

X

BIT 1

MASTER T

X

BIT 1

DS18B20 T

X

BIT 63

DS18B20 T

X

BIT 63

MASTER T

X

BIT 63

BIT 0

MATCH?

BIT 1

MATCH?

BIT 63

MATCH?

N

N

N

Y

Y

Y

DS18B20 T

X

FAMILY CODE

1 BYTE

DS18B20 T

X

SERIAL NUMBER

6 BYTES

DS18B20 T

X

CRC BYTE

DS18B20 T

X

BIT 0

DS18B20 T

X

BIT 0

MASTER T

X

BIT 0

N

Y

DEVICE(S)

WITH ALARM

FLAG SET?

Initialization

Sequence

MASTER T

X

FUNCTION

COMMAND

(FIGURE 12)

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 18 19 20

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