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LM75 View Datasheet(PDF) - ON Semiconductor

Part NameDescriptionManufacturer
LM75 2-Wire Serial Temperature Sensor and Monitor ON-Semiconductor
ON Semiconductor ON-Semiconductor
LM75 Datasheet PDF : 12 Pages
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LM75
Temperature (TEMP) Register, 16–bits, Read–only
The binary value in this register represents ambient
temperature following a conversion cycle.
Temperature Register (TEMP)
D[15] D[14] D[13] D[12] D[11] D[10] D[9] D[8] D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
MSB D7
D6
D5
D4
D3
D2 D1 LSB X
X
X
X
X
X
X
Temperature Setpoint (TSET) and Hysteresis (THYST) Register, 16–bits, Read–Write:
Temperature Setpoint Register (TSET)
D[15] D[14] D[13] D[12] D[11] D[10] D[9] D[8] D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
MSB D7
D6
D5
D4
D3
D2 D1 LSB X
X
X
X
X
X
X
Hysteresis Register (THYST)
D[15] D[14] D[13] D[12] D[11] D[10] D[9] D[8] D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
MSB D7
D6
D5
D4
D3
D2 D1 LSB X
X
X
X
X
X
X
In the TEMP, TSET, and THYST registers, each unit value
represents one–half degree (Celsius). The value is in 2’s –
complement binary format such that a reading of
000000000b corresponds to 0°C. Examples of this
temperature to binary value relationship are shown in the
following table.
Temperature to Digital Value Conversion
Temperature
+125°C
+25°C
+0.5°C
0°C
— 0.5°C
— 25°C
— 40°C
— 55°C
Binary Value
0 11111010
0 00110010
0 00000001
0 00000000
1 11111111
1 11001110
1 10110000
1 10010010
HEX Value
0FA
032
001
00
1FF
1CE
1B0
192
The LM75’s register set is summarized below
Name
TEMP
TSET
THYST
POINT
CONFIG
Description
Ambient Temperature
Temperature Setpoint
Temperature Hysteresis
Register Pointer
Configuration Register
Width
16
16
16
8
8
Read
X
X
X
X
X
Write
X
X
X
X
Notes
2’s Complement Format
2’s Complement Format
2’s Complement Format
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