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LM95235 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM95235
Description  Precision Remote Diode Temperature Sensor with SMBus Interface and TruTherm Technology
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM95235 Datasheet(HTML) 1 Page - National Semiconductor (TI)

 
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LM95235
Precision Remote Diode Temperature Sensor with
SMBus Interface and TruThermTechnology
General Description
The LM95235 is an 11-bit digital temperature sensor with a
2-wire System Management Bus (SMBus) interface and Tru-
Therm 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 proces-
sors, or a diode-connected MMBT3904 transistor. TruTherm
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® proces-
sor on a 65 nm or 90 nm process or MMBT3904, as well as
an offset register for maximum flexibility and best accuracy.
The LM95235 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 LM95235 has a programmable conversion
rate register and a standby mode to save power. One con-
version can be triggered in standby mode by writing to the
one-shot register.
Features
n
Remote and Local temperature channels
n
Diode Model Selection Bit - MMBT3904 or 65/90 nm
processor diodes
n
Two Formats: −128˚C to +127.875˚C and 0˚C to 255˚C
n
Digital filter for remote channel
n
Programmable TCRIT and OS thresholds
n
Programmable shared hysteresis register
n
Diode Fault Detection
n
Mask, Offset, and Status Registers
n
SMBus 2.0 compatible interface, supports TIMEOUT
n
Programmable conversion rate for best power
consumption
n
Three-level address pin
n
Standby mode one-shot conversion control
n
Pin-for-pin compatible with the LM86/LM89
n
8-pin MSOP package
Key Specifications
j Supply Voltage
3.0 V to 3.6 V
j Supply Current, Conv. Rate=1Hz
350 µA (typ)
j Remote Diode Temperature Accuracy
T
A = 25˚C to 85˚C; TD = 60˚C to 100˚C
±0.75˚C (max)
T
A = 25˚C to 85˚C; TD = 40˚C to 120˚C
±1.5˚C (max)
j Local Temperature Accuracy
T
A = 25˚C to 100˚C
±2.0˚C (max)
j Conversion Rate, Both Channels
16 to 0.4 Hz
Applications
n
Processor/Computer System Thermal Management
(e.g. Laptops, Desktops, Workstations, Servers)
n
Electronic Test Equipment
n
Office Electronics
Connection Diagram
MSOP-8
20174902
TOP VIEW
TruThermis a trademark of National Semiconductor Corporation.
Intel® is a registered trademark of Intel Corporation.
Pentium® is a registered trademark of Intel Corporation.
Intel® CoreDuo is a trademark of Intel Corporation.
Intel® CoreSolo is a trademark of Intel Corporation.
May 2006
© 2006 National Semiconductor Corporation
DS201749
www.national.com


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