LM75BD(2008) View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
Manufacturer
LM75BD Datasheet PDF : 37 Pages
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NXP Semiconductors
LM75B
Digital temperature sensor and thermal watchdog
7.4.1 Pointer register
The Pointer register contains an 8-bit data byte, of which the two LSB bits represent the
pointer value of the other four registers, and the other 6 MSB bits are equal to 0, as shown
in Table 6 and Table 7. The Pointer register is not accessible to the user, but is used to
select the data register for write/read operation by including the pointer data byte in the
bus command.
Table 6. Pointer register
B7
B6
B5
B4
B3
B2
B[1:0]
0
0
0
0
0
0
pointer value
Table 7.
B1
0
0
1
1
Pointer value
B0
Selected register
0
Temperature register (Temp)
1
Configuration register (Conf)
0
Hysteresis register (Thyst)
1
Overtemperature shutdown register (Tos)
Because the Pointer value is latched into the Pointer register when the bus command
(which includes the pointer byte) is executed, a read from the LM75B may or may not
include the pointer byte in the statement. To read again a register that has been recently
read and the pointer has been preset, the pointer byte does not have to be included. To
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 LM75B 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 00 and the Temp register is selected; users can
then read the Temp data without specifying the pointer byte. However, the first
temperature reading will be incorrect and must be ignored. Subsequent reads of the
temperature register will be correct.
7.4.2 Configuration register
The Configuration register (Conf) is a write/read register and contains an 8-bit
non-complement data byte that is used to configure the device for different operation
conditions. Table 8 shows the bit assignments of this register.
Table 8. Conf register
Legend: * = default value.
Bit
Symbol
Access Value Description
B[7:5] reserved
R/W 000* reserved for manufacturer’s 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
LM75B
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 6.1 — 6 February 2015
© NXP B.V. 2015. All rights reserved.
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