LM75BGD,125 NXP Semiconductors, LM75BGD,125 Datasheet - Page 8

• Manufacturer Part Number: LM75BGD,125
• Description: IC TEMP SENSOR DGTL 8-UXSON
• Manufacturer: NXP Semiconductors

Specifications of LM75BGD,125

• Package / Case: 8-XSON
• Function: Temp Sensor, Watchdog
• Topology: ADC (Sigma Delta), Comparator, Oscillator, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 125°C
• Output Type: I²C™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 2.8 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Temperature Threshold: + 80 C
• Full Temp Accuracy: +/- 3 C
• Digital Output - Bus Interface: I2C
• Digital Output - Number Of Bits: 11
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.8 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Supply Current: 100 uA
• Temperature Sensor Function: Temp Sensor
• Operating Temperature (max): 125C
• Operating Temperature Classification: Military
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 568-4769-2; 935288239125

NXP Semiconductors
LM75B_2
Product data sheet
7.4.3 Temperature register
Table 7.
Legend: * = default value.
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 2’s complement format with the resolution of 0.125 C.
bit arrangement of the Temp data in the data bytes.
Table 8.
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 C from the 11-bit Temp data is:
Examples of the Temp data and value are shown in
Table 9.
Bit
B1
B0
MSByte
11-bit binary
(2’s complement)
011 1111 1000
011 1111 0111
011 1111 0001
011 1110 1000
000 1100 1000
000 0000 0001
000 0000 0000
111 1111 1111
D10
1. If the Temp data MSByte bit D10 = 0, then the temperature is positive and Temp value
2. If the Temp data MSByte bit D10 = 1, then the temperature is negative and
7
( C) = +(Temp data)
Temp value ( C) = (2’s complement of Temp data)
D9
6
Symbol
OS_COMP_INT R/W
SHUTDOWN
Conf register
Temp register
Temp register value
D8
5
D7
4
Rev. 02 — 9 December 2008
Hexadecimal value
3F8
3F7
3F1
3E8
0C8
001
000
7FF
D6
…continued
3
Access Value Description
R/W
0.125 C.
D5
2
0*
1
0*
1
D4
1
Digital temperature sensor and thermal watchdog
D3
OS operation mode selection
device operation mode selection
0
OS comparator
OS interrupt
normal
shutdown
LSByte
Decimal value
1016
1015
1009
1000
200
1
0
D2
1
7
D1
Table
6
D0
0.125 C.
9.
5
X
4
Value
+127.000 C
+126.875 C
+126.125 C
+125.000 C
+25.000 C
+0.125 C
0.000 C
0.125 C
X
3
© NXP B.V. 2008. All rights reserved.
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