1FEATURES

2• Remote and Local Temperature Channels

• Targeted for Intel 45nm Processor Diodes

• Two Formats: −128°C to +127.875°C and 0°C to

255.875°C

• Digital Filter for Remote Channel

• Programmable TCRIT and OS Thresholds

• Programmable Shared Hysteresis Register

• Diode Fault Detection

• Mask, Offset, and Status Registers

• SMBus 2.0 Compatible Interface, Supports

TIMEOUT

• Programmable Conversion Rate for Best

Power Consumption

• Three-Level Address Pin

• Standby Mode One-Shot Conversion Control

• Pin-for-Pin Compatible With the LM95235 and

LM86, LM89, LM99

• 8-Pin VSSOP and SOIC Packages

APPLICATIONS

• Processor/Computer System Thermal

Management (For Example, Laptops,

Desktops, Workstations, Servers)

• Electronic Test Equipment

• Office Electronics

KEY SPECIFICATIONS

• 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

DESCRIPTION

The LM95245 is an 11-bit digital temperature sensor

with a 2-wire System Management Bus (SMBus)

interface and TruTherm technology that can monitor

the temperature of a remote diode as well as its own

temperature. The LM95245 can be used to very

accurately monitor the temperature of external

devices such as microprocessors. TruTherm

technology allows the LM95245 to precisely monitor

thermal diodes found in 90 nm and smaller geometry

processes. The LM95245 is specifically targeted for

Intel processors on 45nm process. LM95245 reports temperature in two different formats for +127.875°C/-

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

T_CRIT and OS outputs are asserted when either

unmasked channel exceeds its programmed limit and

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

system fans, or as a microcontroller interrupt function.

The current status of the T_CRIT and OS pins can be

read back from the status registers via the SMBus

interface. All limits have a shared programmable

hysteresis register.

The remote temperature channel of the LM95245 has

a programmable digital filter. The LM95245 is

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

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

maximum flexibility and best accuracy.

The LM95245 has a three-level address pin to

connect up to 3 devices to the same SMBus master,

that is shared with the OS output. The LM95245 has

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

register.