LM95245

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SNIS148G – OCTOBER 2007 – REVISED MARCH 2013

Precision Remote Diode Digital Temperature Sensor with TruTherm® BJT Beta

Compensation Technology for 45nm Process

Check for Samples: LM95245

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FEATURES

DESCRIPTION

The LM95245 is an 11-bit digital temperature sensor

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•

Remote and Local Temperature Channels

with a 2-wire System Management Bus (SMBus)

•

Targeted for Intel 45nm Processor Diodes

interface and TruTherm technology that can monitor

•

Two Formats:

−128°C to +127.875°C and 0°C to

the temperature of a remote diode as well as its own

255.875°C

temperature. The LM95245 can be used to very

accurately

monitor

the

temperature

of

external

•

Digital Filter for Remote Channel

devices

such

as

microprocessors.

TruTherm

•

Programmable TCRIT and OS Thresholds

technology allows the LM95245 to precisely monitor

•

Programmable Shared Hysteresis Register

thermal diodes found in 90 nm and smaller geometry

processes. The LM95245 is specifically targeted for

•

Diode Fault Detection

Intel processors on 45nm process. LM95245 reports

•

Mask, Offset, and Status Registers

temperature in two different formats for +127.875°C/-

•

SMBus 2.0 Compatible Interface, Supports

128°C range and 0°C/255°C range. The LM95245

TIMEOUT

T_CRIT and OS outputs are asserted when either

unmasked channel exceeds its programmed limit and

•

Programmable Conversion Rate for Best

can be used to shutdown the system, to turn on the

Power Consumption

system fans, or as a microcontroller interrupt function.

•

Three-Level Address Pin

The current status of the T_CRIT and OS pins can be

•

Standby Mode One-Shot Conversion Control

read back from the status registers via the SMBus

interface. All limits have a shared programmable

•

Pin-for-Pin Compatible With the LM95235 and

hysteresis register.

LM86, LM89, LM99

The remote temperature channel of the LM95245 has

•

8-Pin VSSOP and SOIC Packages

a

programmable

digital

filter.

The

LM95245

is

targeted for a typical Intel® processor on a 45 nm, 65

APPLICATIONS

nm or 90nm process, and has an offset register for

•

Processor/Computer System Thermal

maximum flexibility and best accuracy.

Management (For Example, Laptops,

The LM95245 has a three-level address pin to

Desktops, Workstations, Servers)

connect up to 3 devices to the same SMBus master,

•

Electronic Test Equipment

that is shared with the OS output. The LM95245 has

•

Office Electronics

a programmable conversion rate register and a

standby mode to save power. One conversion can be

triggered in standby mode by writing to the one-shot

KEY SPECIFICATIONS

register.

•

Supply Voltage 3.0 to 3.6 V

•

Supply Current, Conv. Rate = 1 Hz 350 µA (typ)

•

Remote Diode Temperature Accuracy

–

TA = 25°C to 85°C; TD = 50°C to 105°C, ±0.75

°C (max)

–

TA = 25°C to 85°C; TD = 40°C to 125°C, ±1.5

°C (max)

•

Local Temperature Accuracy

–

TA = 25°C to 100°C, ±2.0 °C (max)

•

Conversion Rate, Both Channels 16 to 0.4 Hz

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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PRODUCTION DATA information is current as of publication date.

Copyright © 2007–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.