The LM80 is an I2C interface that monitors microprocessor system hardware. It can measure temperature, voltage, fan speed, etc., and has watchdog comparison functions, which can monitor and reset external circuits. It is suitable for both linear and digital temperature sensors, and it has a 2.8V to 5.75V power supply voltage range, low power supply current and I2C interface, so it can be widely used in personal computers, electronic test equipment and office electronic devices.
The LM80 hardware monitor integrates seven analog voltage inputs, temperature sensing, two programmable fan‑speed inputs, a chassis intrusion detector, and watchdog functionality on a single chip. It communicates over a two‑wire Serial Bus compatible with ACPI and can operate from a 2.8 V to 5.75 V supply.
Typical applications include server and PC system monitoring, office electronics, and electronic test equipment. The device offers 8‑bit ADC conversion with a 10 mV LSB and supports both linear (e.g., LM50) and digital temperature sensors (e.g., LM75).
| Supply Voltage Range | 2.8 V to 5.75 V |
|---|---|
| Operating Supply Current | 0.2 mA typ |
| Shutdown Supply Current | 15 µA typ |
| ADC Resolution | 8 bits |
| Temperature Resolution | 0.5 °C |
| Analog Input Full‑Scale Range | 0 V to 2.56 V |
| Number of Analog Inputs | 7 |
| Number of Fan Speed Inputs | 2 programmable |
The LM80 operates from a supply voltage of 2.8 V to 5.75 V.
The device provides seven positive voltage inputs.
The LM80 uses an 8‑bit ADC.
Typical operating supply current is 0.2 mA.