Features • Temperature sensing • 7 positive voltage inputs • 2 programmable fan speed monitoring inputs • 10 mV LSB and 2.56V input range accepts outputs from linear temperature sensors such as the LM50 • Chassis Intrusion Detector input • WATCHDOG comparison of all monitored values • Separate input to show status in Interrupt Status Register of additional external temperature sensors such as the LM56 or LM75 • I 2C ™ Serial Bus interface compatibility • Shutdown mode to minimize power consumption • Programmable ^RST_OUT/ ^OS pin: ^RST_OUT provides a Reset output; ^OS provides an Interrupt Output activated by an Overtemperature Shutdown event Description The LM80 provides 7 positive voltage inputs, temperature measurement, fan speed measurement, and hardware monitoring on an I 2C ™ interface. The LM80 performs WATCHDOG comparisons of all measured values and an open-drain interrupt output becomes active when any values exceed programmed limits. A Chassis Intrusion input is provided 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 I 2C interface make it ideal for a wide range of applications. These include hardware monitoring and protection applications in personal computers, electronic test equipment, and office electronics. Key Specification ■  Voltage monitoring Error ±1% (max) ■  Temperature Error     −25°C to +125°C ± 3°C (max) ■  Supply Voltage Range 2.8V to 5.75V ■  Supply Current: Operating 0.2 mA typ ■  Supply Current: Shutdown 15 μA typ ■  ADC Resolution 8 Bits ■  Temperature Resolution 0.5°C Applications • System Thermal and Hardware Monitoring for Servers and PCs • Office Electronics • Electronic Test Equipment and Instrumentation

Also Recommended LM96080▲ Increased Resolution At 10 Bit, Better Temperature And Clock Accuracy MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application click for larger image	Block Diagram click for larger image

Datasheet

Title		Size	Date	Other Language
	LM80 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor	568 Kbytes	1-Nov-09	日本語

Featured Application Notes

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	AN-711: Application Note 711 LM78S40 Switching Voltage Regulator Applications	490 Kbytes	3-Oct-02

More Application Notes

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	AN-1155: Application Note 1155 A Simple Software I2C Routine for the COP8	82 Kbytes	15-May-04
	AN-1260: Application Note 1260 Autonomous Fan Control for Processor Systems Using the LM85	74 Kbytes	10-Mar-04
	AN-1262: Application Note 1262 Four-Speed Fan Control Using Simple Remote Diode Temperature Sensor	70 Kbytes	1-Oct-02

Design Tools

Title	Size	Date
LMxx - Windows 95/98 VXD drivers with stand alone application for talking to temperature sensors or hardware monitors on a mother board	1366 Kbytes	28-Jul-2003

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM80CIMT-3	CS100	1	14211	71	0	898000	4	254809951
LM80CIMT-5	CS100	1	14211	71	0	898000	4	254809951
LM80CIMTX-3	CS100	1	14211	71	0	898000	4	254809951
LM80CIMTX-5	CS100	1	14211	71	0	898000	4	254809951

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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