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LM95231BIMM Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM95231BIMM
Description  Precision Dual Remote Diode Temperature Sensor with SMBus Interface and TruTherm Technology
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM95231BIMM Datasheet(HTML) 1 Page - National Semiconductor (TI)

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LM95231
Precision Dual Remote Diode Temperature Sensor with
SMBus Interface and TruThermTechnology
General Description
The LM95231 is a precision dual remote diode temperature
sensor (RDTS) that uses National’s TruTherm technology.
The 2-wire serial interface of the LM95231 is compatible with
SMBus 2.0. The LM95231 can sense three temperature
zones, it can measure the temperature of its own die as well
as two diode connected transistors. The LM95231 includes
digital filtering and an advanced input stage that includes
analog filtering and TruTherm technology that reduces
processor-to-processor non-ideality spread. The diode con-
nected transistors can be a “thermal diode” as found in Intel
and AMD processors or can simply be a diode connected
MMBT3904 transistor. TruTherm technology allows accurate
measurement of “thermal diodes” found on small geometry
processes, 90nm and below. The LM95231 supports user
selectable thermal diode non-ideality of either a Pentium® 4
processor on 90nm process or 2N3904.
The LM95231 resolution format for remote temperature
readings can be programmed to be 11-bits signed or un-
signed with the digital filtering disabled. When the filtering is
enabled the resolution increases to 13-bits signed or un-
signed. In the unsigned mode the LM95231 remote diode
readings can resolve temperatures above 127˚C. Local tem-
perature readings have a resolution of 9-bits plus sign.
Features
n
Accurately senses die temperature of remote ICs or
diode junctions
n
Uses TruTherm technology for precision “thermal diode”
temperature measurement
n
Thermal diode input stage with analog filtering
n
Thermal diode digital filtering
n
Intel Pentium 4 processor on 90nm process or 2N3904
non-ideality selection
n
Remote diode fault detection
n
On-board local temperature sensing
n
Remote temperature readings without digital filtering:
— 0.125 ˚C LSb
— 10-bits plus sign or 11-bits programmable resolution
— 11-bits resolves temperatures above 127 ˚C
n
Remote temperature readings with digital filtering:
— 0.03125 ˚C LSb with filtering
— 12-bits plus sign or 13-bits programmable resolution
— 13-bits resolves temperatures above 127 ˚C
n
Local temperature readings:
— 0.25 ˚C
— 9-bits plus sign
n
Status register support
n
Programmable conversion rate allows user optimization
of power consumption
n
Shutdown mode one-shot conversion control
n
SMBus 2.0 compatible interface, supports TIMEOUT
n
8-pin MSOP package
Key Specifications
j Remote Temperature Accuracy
±0.75˚C (max)
j Local Temperature Accuracy
±3.0˚C (max)
j Supply Voltage
3.0V to 3.6V
j Supply Current
402µA (typ)
Applications
n
Processor/Computer System Thermal Management
(e.g. Laptop, Desktop, Workstations, Server)
n
Electronic Test Equipment
n
Office Electronics
Connection Diagram
MSOP-8
20120202
TOP VIEW
TruThermis a trademark of National Semiconductor Corporation.
I2C® is a registered trademark of Philips Corporation.
Pentium® is a registered trademark of Intel Corporation.
August 2006
© 2006 National Semiconductor Corporation
DS201202
www.national.com


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