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LM95241 Datasheet(PDF) 10 Page - Texas Instruments

Part No. LM95241
Description  Dual Remote Diode Temperature Sensor with SMBus Interface and TruTherm™ Technology (65nm/90nm)
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM95241 Datasheet(HTML) 10 Page - Texas Instruments

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LM95241
SNIS143E – AUGUST 2006 – REVISED MARCH 2013
www.ti.com
CONVERSION SEQUENCE
In the power up default state the LM95241 typically takes 77.8 ms to convert the Local Temperature, Remote
Temperature 1 and 2, and to update all of its registers. Only during the conversion process is the busy bit (D7) in
the Status register (02h) high. These conversions are addressed in a round robin sequence. The conversion rate
may be modified by the Conversion Rate bits found in the Configuration Register (03h). When the conversion
rate is modified a delay is inserted between conversions, the actual maximum conversion time remains at 88.9
ms. Different conversion rates will cause the LM95241 to draw different amounts of supply current as shown in
Figure 7.
Figure 7. Conversion Rate Effect on Power Supply Current
POWER-ON-DEFAULT STATES
LM95241 always powers up to these known default states. The LM95241 remains in these states until after the
first conversion.
1. Command Register set to 00h
2. Local Temperature set to 0°C until the end of the first conversion
3. Remote Diode Temperature set to 0°C until the end of the first conversion
4. Remote Diode digital filters are on.
5. Remote Diode 1 model is set to Intel processor on 65nm or 90nm process with TruTherm Mode enabled.
Remote Diode 2 model is set to 2N3904/MMBT3904 with TruTherm mode disabled.
6. Status Register depends on state of thermal diode inputs
7. Configuration register set to 00h; continuous conversion
SMBus INTERFACE
The LM95241 operates as a slave on the SMBus, so the SMBCLK line is an input and the SMBDAT line is
bidirectional. The LM95241 never drives the SMBCLK line and it does not support clock stretching. According to
SMBus specifications, the LM95241 has a 7-bit slave address. All bits A6 through A0 are internally programmed
and cannot be changed by software or hardware. The SMBus slave address is dependent on the LM95241 part
number ordered:
Version
A6
A5
A4
A3
A2
A1
A0
LM95241CIMM
0
1
0
1
0
1
1
LM95241CIMM-1
0
0
1
1
0
0
1
LM95241CIMM-2
0
1
0
1
0
1
0
10
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Copyright © 2006–2013, Texas Instruments Incorporated
Product Folder Links: LM95241


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