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The LM81 is a highly integrated data acquisition system for hardware monitoring of servers, Personal Computers, or virtually any microprocessor-based system. In a PC, the LM81 can be used to monitor power supply voltages, temperatures, and fan speeds. Actual values for these inputs can be read at any time. Programmable WATCHDOG limits in the LM81 activate a fully programmable and maskable interrupt system with two outputs (INT and T_CRIT_). The LM81 has an on-chip digital output temperature sensor with 9-bit or 12-bit resolution, a 6 analog input ADC with 8-bit resolution and an 8-bit DAC. Two fan tachometer outputs can be measured with the LM81’s FAN1 and FAN2 inputs. The DAC, with a 0 to 1.25V output voltage range, can be used for fan speed control. Additional inputs are provided for Chassis Intrusion detection circuits, and VID monitor inputs. The LM81 has a Serial Bus interface that is compatible with SMBus. Serial Bus Timing Diagram
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | Serial Interface ACP-Compatible Microprocessor Sys Hardware Monitor datasheet (Rev. E) | 05 Sep 2013 | |
| Application note | Applying I2C-Compatible Temperature Sensors in Systems With Slow Clock Edges (Rev. A) | 06 May 2013 | ||
| White paper | Cost Effective Partitioning of IO & Mgm Func in PCs - Intro of SensorPath Tech | 01 Jan 2004 |
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| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| TSSOP (PW) | 24 | Ultra Librarian |
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