1FEATURES

2? Remote and Local Temperature Channels

? TruTherm BJT Beta Compensation Technology

? LM95235Q is AEC-Q100 Grade 3 Compliant

and is Manufactured on an Automotive Grade

Flow

? Diode Model Selection Bit - MMBT3904 or

65/90-nm 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 LM86 and

LM89

? 8-Pin VSSOP Package

APPLICATIONS

? Processor/Computer System Thermal

Management (For Example, Laptops,

Desktops, Workstations, Servers)

? Electronic Test Equipment and 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 = 60°C to 100°C, ±0.75

°C (max)

– TA = 25°C to 90°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 LM95235 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 LM95235 can be used to very

accurately monitor the temperature of external

devices such as microprocessors, graphics

processors, or a diode-connected MMBT3904 transistor. For automotive applications the LM95235Q

is available that is AEC-Q100 Grade3 compliant and

is manufactured on an Automotive Grade Flow.

TruTherm BJT (transistor) beta compensation

technology allows the LM95235 to precisely monitor thermal diodes found in 90 nm and smaller geometry

processes. LM95235 reports temperature in two

different formats for +127.875°C/-128°C range and

0°C/255°C range. The LM95235 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 LM95235 has

a programmable digital filter. The LM95235 contains

a diode model selection bit to select between a

typical Intel? processor on a 65 nm or 90 nm process

or MMBT3904, as well as an offset register for

maximum flexibility and best accuracy.