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LM80 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM80 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 29 page  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 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 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 I 2C 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 I 2C 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 ±1% (max) n Temperature Error −25˚C to +125˚C ± 3˚C (max) n Supply Voltage Range 2.8V to 5.75V n Supply Current Operating: 0.2 mA typ Shutdown: 15 µA typ n ADC Resolution 8 Bits n Temperature Resolution 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 TRI-STATE® is a registered trademark of National Semiconductor Corporation. WATCHDOG™ is a trademark of National Semiconductor Corporation. I2C® is a registered trademark of the Philips Corporation. DS100040-1 # Indicates Active Low (“Not”) June 1999 © 1999 National Semiconductor Corporation DS100040 www.national.com |
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