DS18B20 Maxim Integrated Products, DS18B20 Datasheet - Page 13

• Manufacturer Part Number: DS18B20
• Description: IC THERM MICROLAN PROG-RES TO-92
• Manufacturer: Maxim Integrated Products

Specifications of DS18B20

• Function: Thermometer, Thermostat
• Topology: Register Bank, Scratchpad
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 125°C
• Output Type: 1-Wire®
• Output Alarm: Yes
• Output Fan: No
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: TO-92-3 (Standard Body), TO-226
• Full Temp Accuracy: +/- 2 C
• Digital Output - Bus Interface: Serial (1-Wire)
• Digital Output - Number Of Bits: 12 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Figure 11. ROM Commands Flowchart
SERIAL NUMBER
FAMILY CODE
DS18B20 T
DS18B20 T
DS18B20 T
READ ROM
COMMAND
CRC BYTE
6 BYTES
1 BYTE
33h
Y
X
X
X
Initialization
Sequence
N
MATCH ROM
MASTER T
MASTER T
COMMAND
MASTER T
MATCH?
MATCH?
MATCH?
BIT 63
BIT 0
BIT 0
BIT 1
BIT 63
BIT 1
55h
Y
Y
Y
Y
MASTER T
X
X
RESET PULSE
X
DS18B20 T
PRESENCE
COMMAND
MASTER T
N
PULSE
N
N
N
X
ROM
X
X
(FIGURE 12)
MASTER T
COMMAND
FUNCTION
N
N
N
DS18B20 T
DS18B20 T
MASTER T
DS18B20 T
DS18B20 T
MASTER T
DS18B20 T
DS18B20 T
MASTER T
SEARCH ROM
COMMAND
13 of 22
Y
MATCH?
MATCH?
Y
MATCH?
BIT 0
BIT 1
BIT 63
X
F0h
X
X
X
X
X
X
Y
X
X
X
BIT 63
BIT 0
Y
BIT 63
BIT 0
BIT 0
BIT 63
BIT 1
BIT 1
BIT 1
N
DS18B20 T
DS18B20 T
MASTER T
ALARM SEARCH
WITH ALARM
COMMAND
FLAG SET?
DEVICE(S)
ECh
X
Y
X
X
Y
BIT 0
BIT 0
BIT 0
N
N
COMMAND
SKIP ROM
CCh
Y
N
DS18B20