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LM80 Datasheet

Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor

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June 1999
LM80
Serial Interface ACPI-Compatible Microprocessor System
Hardware Monitor
General Description
The LM80 provides 7 positive voltage inputs, temperature
measurement, fan speed measurement, and hardware
monitoring on an I2Cinterface. The LM80 performs
WATCHDOGcomparisons of all measured values and an
open-drain interrupt output becomes active when any values
exceed programmed limits. A Chassis Intrusion input is pro-
vided to monitor and reset an external circuit designed to
latch a chassis intrusion event.
The LM80 is especially suited to interface to both linear and
digital temperature sensors. The 10 mV LSB and 2.56 volt
input range is ideal for accepting inputs from a linear sensor
such as the LM50. The BTI is used as an input from either
digital or thermostat sensors such as LM75 and LM56.
The LM80’s 2.8V to 5.75V supply voltage range, low supply
current, and I2C interface make it ideal for a wide range of
applications. These include hardware monitoring and protec-
tion applications in personal computers, electronic test
equipment, and office electronics.
Features
n Temperature sensing
n 7 positive voltage inputs
n 2 programmable fan speed monitoring inputs
n 10 mV LSB and 2.56V input range accepts outputs from
linear temperature sensors such as the LM50
n Chassis Intrusion Detector input
n WATCHDOG comparison of all monitored values
n Separate input to show status in Interrupt Status
Register of additional external temperature sensors such
as the LM56 or LM75
n I2C Serial Bus interface compatibility
n Shutdown mode to minimize power consumption
n Programmable RST_OUT/OS pin: RST_OUT provides a
Reset output; OS provides an Interrupt Output activated
by an Overtemperature Shutdown event
Key Specifications
n Voltage monitoring Error
n Temperature Error
−25˚C to +125˚C
n Supply Voltage Range
n Supply Current
n ADC Resolution
n Temperature Resolution
Operating:
Shutdown:
±1% (max)
± 3˚C (max)
2.8V to
5.75V
0.2 mA typ
15 µA typ
8 Bits
0.5˚C
Applications
n System Thermal and Hardware Monitoring for Servers
and PCs
n Office Electronics
n Electronic Test Equipment and Instrumentation
Typical Application
# Indicates Active Low (“Not”)
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
WATCHDOGis a trademark of National Semiconductor Corporation.
I2C® is a registered trademark of the Philips Corporation.
© 1999 National Semiconductor Corporation DS100040
DS100040-1
www.national.com


National Semiconductor Electronic Components Datasheet

LM80 Datasheet

Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor

No Preview Available !

Ordering Information
Temperature Range
−25˚C TA +125˚C
NS
Package
Number
Order Number
Device
Marking
LM80CIMT-31
LM80CIMTX-3 2 LM80CIMT-3 MTC24B
LM80CIMT-51
LM80CIMTX-52 LM80CIMT-5 MTC24B
Note: 1-Rail transport media, 62 parts per rail
2-Tape and reel transport media, 3400 parts per reel
Specified
Power
Supply
Voltage
3.3V
5.0V
Block Diagram
Connection Diagram
DS100040-2
Pin Descriptions
Pin
Name(s)
INT_IN
Pin
Number
1
Number
of Pins
1
Type
Digital Input
SDA
SCL
2 1 Digital I/O
3 1 Digital Input
DS100040-3
Description
This is an active low input that propagates the INT_IN signal to the
INT output of the LM80 via Interrupt Mask Register 1 Bit 7 and INT
enable Bit 1 of the Configuration Register.
Serial Bus bidirectional Data. Open-drain output.
Serial Bus Clock.
www.national.com
2


Part Number LM80
Description Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor
Maker National Semiconductor
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