DS18B20-PAR-TU0026R 데이터 시트보기 (PDF) - Maxim Integrated

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DS18B20-PAR-TU0026R

Programmable Resolution 1-Wire Digital Thermometer

Maxim Integrated 

ROM COMMANDS FLOW CHART Figure 10

DS18B20-PAR

Initialization

Sequence

MASTER TX

RESET PULSE

DS18B20-PAR

TX PRESENCE

PULSE

33h

READ ROM

N

COMMAND

Y

DS18B20-PAR TX

FAMILY CODE

1 BYTE

DS18B20-PAR TX

SERIAL NUMBER

6 BYTES

DS18B20-PAR TX

CRC BYTE

MASTER TX ROM

COMMAND

55h

MATCH ROM

N

COMMAND

Y

MASTER TX

BIT 0

F0h

N

SEARCH ROM

COMMAND

Y

ECh

N

ALARM SEARCH

COMMAND

Y

DS18B20-PAR TX BIT 0

DS18B20-PAR TX BIT 0

MASTER TX BIT 0

DS18B20-PAR TX BIT 0

DS18B20-PAR TX BIT 0

MASTER TX BIT 0

CCh

SKIP ROM

N

COMMAND

Y

N

BIT 0

MATCH?

Y

N

BIT 0

MATCH?

Y

MASTER TX

BIT 1

DS18B20-PAR TX BIT 1

DS18B20-PAR TX BIT 1

MASTER TX BIT 1

DEVICE(S)

N

WITH ALARM

FLAG SET?

Y

N

BIT 1

MATCH?

Y

MASTER TX

BIT 63

N

BIT 63

MATCH?

Y

N

BIT 1

MATCH?

Y

DS18B20-PAR TX BIT 63

DS18B20-PAR TX BIT 63

MASTER TX BIT 63

N

BIT 63

MATCH?

Y

MASTER TX

FUNCTION

COMMAND

(FIGURE 11)

11 of 19

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