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1FEATURES

23? Accurately Senses Die Temperature of 2

Remote ICs or Diode Junctions and Local

Temperature

? TruTherm BJT Beta Compensation Technology

Accurately Senses Sub-Micron Process

Thermal Diodes

? 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

? Programmable Digital Filters and Analog Front

End Filter

? Remote Diode Fault Detection, Model diodeSelection

and Offset Correction

? Mask and Status Register Support

? 3 Programmable TCRIT Outputs with

Programmable Shared Hysteresis

? 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

APPLICATIONS

? Processor/Computer System Thermal

Management (e.g. Laptop, Desktop,

Workstations, Server)

? Electronic Test Equipment

? Office Electronics

KEY SPECIFICATIONS

? Local Temperature Accuracy: ±2.0 °C (max)

? Remote Diode Temperature Accuracy: ±0.875

°C (max)

? Supply Voltage: 3.0 to 3.6 V

? Average Supply Current (1Hz conversion rate):

0.57 mA (typ)

DESCRIPTION

LM95233 is an 11-bit digital temperature sensor with

a 2-wire System Management Bus (SMBus) interface

that can monitor the temperature of two remote

diodes as well as its own temperature. The LM95233

can be used to very accurately monitor the

temperature of up to two external devices such as

microprocessors, graphics processors or diodeSelection

connected 2N3904s. The LM95233's TruTherm?

BJT beta compensation technology allows sensing of

90nm or 65nm process thermal diodes accurately.

The LM95233 reports temperature in two different

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

range. The LM95233 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. LM95233's remote

temperature channels have programmable digital

filters to minimize unwanted TCRIT events when

temperature spikes are encountered.

For optimum flexibility and accuracy each LM95233

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 LM95233s to the same SMBus

master. The LM95233 includes power saving

functions such as: programmable conversion rate,

shutdown mode, and turn off of unused channels.