LM75B
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?NXP B.V. 2014. All rights reserved.
Product data sheet
Rev. 5 22 January 2014
9 of 37
NXP Semiconductors
LM75B
Digital temperature sensor and thermal watchdog
7.4.3 Temperature register
The Temperature register (Temp) holds the digital result of temperature measurement or
monitor at the end of each analog-to-digital conversion. This register is read-only and
contains two 8-bit data bytes consisting of one Most Significant Byte (MSByte) and one
Least Significant Byte (LSByte). However, only 11 bits of those two bytes are used to store
the Temp data in twos complement format with the resolution of 0.125 癈. Table 9
shows
the bit arrangement of the Temp data in the data bytes.
When reading register Temp, all 16 bits of the two data bytes (MSByte and LSByte) are
provided to the bus and must be all collected by the controller to complete the bus
operation. However, only the 11 most significant bits should be used, and the 5 least
significant bits of the LSByte are zero and should be ignored. One of the ways to calculate
the Temp value in 癈 from the 11-bit Temp data is:
1. If the Temp data MSByte bit D10 = 0, then the temperature is positive and Temp value
(癈) = +(Temp data) ?0.125 癈.
2. If the Temp data MSByte bit D10 = 1, then the temperature is negative and
Temp value (癈) = -(twos complement of Temp data) ?0.125 癈.
Examples of the Temp data and value are shown in Table 10
.
B1
OS_COMP_INT R/W
OS operation mode selection
0*
OS comparator
1
OS interrupt
B0
SHUTDOWN
R/W
device operation mode selection
0*
normal
1
shutdown
Table 8.
Conf register &continued
Legend: * = default value.
Bit
Symbol
Access
Value
Description
Table 9.
Temp register
MSByte
LSByte
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
X
X
X
X
X
Table 10. Temp register value
11-bit binary
(twos complement)
Hexadecimal value
Decimal value
Value
011 1111 1000
3F8
1016
+127.000 癈
011 1111 0111
3F7
1015
+126.875 癈
011 1111 0001
3F1
1009
+126.125 癈
011 1110 1000
3E8
1000
+125.000 癈
000 1100 1000
0C8
200
+25.000 癈
000 0000 0001
001
1
+0.125 癈
000 0000 0000
000
0
0.000 癈
111 1111 1111
7FF
-1
-0.125 癈
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