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18B20 数据表(PDF) 13 Page - Dallas Semiconductor

部件名 18B20
功能描述  Programmable Resolution 1-Wire Digital Thermometer
PDF  21 Pages
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制造商  DALLAS [Dallas Semiconductor]
网页  https://www.maximintegrated.com/en.html
标志 DALLAS - Dallas Semiconductor

18B20 数据表(HTML) 13 Page - Dallas Semiconductor

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DS18B20
13 of 21
ROM COMMANDS FLOW CHART Figure 11
CCh
SKIP ROM
COMMAND
MASTER TX
RESET PULSE
DS18B20 TX
PRESENCE
PULSE
MASTER TX ROM
COMMAND
33h
READ ROM
COMMAND
55h
MATCH ROM
COMMAND
F0h
SEARCH ROM
COMMAND
ECh
ALARM SEARCH
COMMAND
MASTER TX
BIT 0
DS18B20 TX BIT 0
DS18B20 TX BIT 0
MASTER TX BIT 0
BIT 0
MATCH?
MASTER TX
BIT 1
BIT 1
MATCH?
BIT 63
MATCH?
MASTER TX
BIT 63
N
Y
Y
Y
Y
Y
N
N
N
N
N
N
N
Y
Y
Y
DS18B20 TX BIT 1
DS18B20 TX BIT 1
MASTER TX BIT 1
DS18B20 TX BIT 63
DS18B20 TX BIT 63
MASTER TX BIT 63
BIT 0
MATCH?
BIT 1
MATCH?
BIT 63
MATCH?
N
N
N
Y
Y
Y
DS18B20 TX
FAMILY CODE
1 BYTE
DS18B20 TX
SERIAL NUMBER
6 BYTES
DS18B20 TX
CRC BYTE
DS18B20 TX BIT 0
DS18B20 TX BIT 0
MASTER TX BIT 0
N
Y
DEVICE(S)
WITH ALARM
FLAG SET?
Initialization
Sequence
MASTER TX
FUNCTION
COMMAND
(FIGURE 12)



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