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.