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18B20 数据表(PDF) 13 Page - Maxim Integrated Products

部件名 18B20
功能描述  1-Wire Digital Thermometer
PDF  22 Pages
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制造商  MAXIM [Maxim Integrated Products]
网页  https://www.maximintegrated.com/en.html
标志 MAXIM - Maxim Integrated Products

18B20 数据表(HTML) 13 Page - Maxim Integrated Products

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DS18B20
13 of 22
Figure 11. ROM Commands Flowchart
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)
W ITH ALARM
FLAG SET?
Initialization
Sequence
MASTER TX
FUNCTION
COMMAND
(FIGURE 12)



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