LM75 ON Semiconductor, LM75 Datasheet - Page 8

• Manufacturer Part Number: LM75
• Description: 2-Wire Serial Temperature Sensor and Monitor
• Manufacturer: ON Semiconductor

Temperature (TEMP) Register, 16–bits, Read–only
temperature following a conversion cycle.
Temperature Register (TEMP)
Temperature Setpoint (T
Temperature Setpoint Register (T SET )
Hysteresis Register (T HYST )
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
The LM75’s register set is summarized below
D[15]
D[15]
D[15]
MSB
MSB
MSB
The binary value in this register represents ambient
In the TEMP, T
CONFIG
T HYST
Temperature
POINT
TEMP
Name
T SET
— 0.5 C
— 25 C
— 40 C
— 55 C
+125 C
+0.5 C
+25 C
0 C
D[14]
D[14]
D[14]
D7
D7
D7
Description
Ambient Temperature
Temperature Setpoint
Temperature Hysteresis
Register Pointer
Configuration Register
SET
D[13]
D[13]
D[13]
D6
D6
D6
, and T
Binary Value
0 00000001
0 00000000
1 10010010
0 00110010
1 11001110
1 10110000
0 11111010
1 11111111
D[12]
D[12]
D[12]
D5
D5
D5
HYST
SET
) and Hysteresis (T
registers, each unit value
D[11]
D[11]
D[11]
D4
D4
D4
D[10]
D[10]
D[10]
D3
D3
D3
HEX Value
1CE
0FA
1FF
1B0
032
001
192
00
D[9]
D[9]
D[9]
D2
D2
D2
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HYST
Width
D[8]
D[8]
D[8]
D1
D1
D1
LM75
16
16
16
8
8
8
) Register, 16–bits, Read–Write:
D[7]
LSB
D[7]
LSB
D[7]
LSB
Read
X
X
X
X
X
D[6]
D[6]
D[6]
X
X
X
D[5]
D[5]
D[5]
X
X
X
Write
X
X
X
X
D[4]
D[4]
D[4]
X
X
X
D[3]
D[3]
D[3]
2’s Complement Format
2’s Complement Format
2’s Complement Format
X
X
X
D[2]
D[2]
D[2]
X
X
X
Notes
D[1]
D[1]
D[1]
X
X
X
D[0]
D[0]
D[0]
X
X
X