1FEATURES

23? Accurately Senses Die Temperature of 4

Remote ICs or Diode Junctions and Local

Temperature

? TruTherm BJT Beta Compensation Technology

Accurately Senses Sub-micron Process

Thermal Diodes

? Programmable Digital Filters and Analog Front

End Filter

? 0.125°C LSb Temperature Resolution

? 0.03125°C LSb Remote Temperature

Resolution with Digital Filter Enabled

? +127.875°C/–128°C and 0°C/255°C Remote

Ranges

? Remote Diode Fault Detection, Model

Selection and Offset Correction

? Mask and Status Register Support

? 3 Programmable TCRIT Outputs with

Programmable Shared Hysteresis and Fault-

Queue

? Programmable Conversion Rate and Shutdown

Mode One-shot Conversion Control

? SMBus 2.0 Compatible Interface, Supports

TIMEOUT

? Three-level Address Pin

? 14-pin WSON Package

KEY SPECIFICATIONS

? Local Temperature Accuracy ±2.0°C (max)

? Remote Diode Temperature Accuracy ±0.875°C

(max)

? Supply Voltage 3.0V to 3.6V

? Average Supply Current (1Hz conversion rate)

APPLICATIONS

? Processor/Computer System Thermal

Management

– (e.g. Laptop, Desktop, Workstations,

Server)

? Electronic Test Equipment

? Office Electronics

DESCRIPTION

LM95234 is an 11-bit digital temperature sensor with

a 2-wire System Management Bus (SMBus) interface

that can very accurately monitor the temperature of

four remote diodes as well as its own temperature

that includes patent pending remote diode

TruTherm? BJT beta compensation beta

compensation technology. The four remote diodes

can be external devices such as microprocessors,

graphics processors or diode-connected 2N3904s.

The LM95234's TruTherm BJT beta compensation

technology allows sensing of 90 nm or 65 nm process

thermal diodes accurately.

The LM95234 reports temperature in two different

formats for +127.875°C/–128°C range and 0°C/255°C

range. The LM95234 TCRIT1, TCRIT2 and TCRIT3

outputs are triggered when any unmasked channel

exceeds its corresponding programmable 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 TCRIT1, TCRIT2 and

TCRIT3 pins can be read back from the status

registers. Mask registers are available for further

control of the TCRIT outputs.

Two LM95234 remote temperature channels have

programmable digital filters while the other two

remote channels utilize a fault-queue to minimize

unwanted TCRIT events when temperature spikes

are encountered.

For optimum flexibility and accuracy, each LM95234

channel includes registers for sub-micron process or

2N3904 diode model selection as well as offset

correction. A three-level address pin allows

connection of up to 3 LM95234s to the same SMBus

master. The LM95234 includes power saving

functions such as: programmable conversion rate,

shutdown mode, and disabling of unused channels.