LM75A_4
?NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 04 10 July 2007
7 of 24
NXP Semiconductors
LM75A
Digital temperature sensor and thermal watchdog
read a register that is different from the one that has been recently read, the pointer byte
must be included. However, a write to the LM75A must always include the pointer byte in
the statement. The bus communication protocols are described in
Section
7.10.
At power-up, the Pointer value is equal to 0 and the Temp register is selected; users can
then read the Temp data without specifying the pointer byte.
7.4.2 Conguration register
The Conguration register (Conf) is a write/read register and contains an 8-bit
non-complement data byte that is used to congure the device for different operation
conditions.
T
ab
le
8 shows the bit assignments of this register.
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 Signicant Byte (MSByte) and one
Least Signicant Byte (LSByte). However, only 11 bits of those two bytes are used to store
the Temp data in 2s complement format with the resolution of 0.125 癈.
T
ab
le
9 shows the
bit arrangement of the Temp data in the data bytes.
Table 8.
Conf register
Legend: * = default value.
Bit
Symbol
Access
Value
Description
B[7:5] reserved
R/W
000* reserved for manufacturers use; should be kept as
zeroes for normal operation
B[4:3] OS_F_QUE[1:0] R/W
OS fault queue programming
00*
queue value = 1
01
queue value = 2
10
queue value = 4
11
queue value = 6
B2
OS_POL
R/W
OS polarity selection
0*
OS active LOW
1
OS active HIGH
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 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
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