LM81 - 串行接口 ACPI 兼容微处理器系统硬件监控器

LM81是TI德州仪器公司的一款监控和??风扇控制产品，LM81是串行接口 ACPI 兼容微处理器系统硬件监控器，本站介绍了LM81的封装应用图解、特点和优点、功能等，并给出了与LM81相关的TI元器件型号供参考。

LM81 - 串行接口 ACPI 兼容微处理器系统硬件监控器 - 监控和??风扇控制 - 其他传感器信号调节器 - 德州仪器

产品描述

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

产品特性

Temperature Sensing
6 Positive Voltage Inputs with Scaling Resistors to Monitor +5V, +12V, +3.3V, +2.5V, Vccp Power Supplies Directly
8-Bit DAC Output for Controlling Fan Speed
2 Fan Speed Monitoring Inputs
Chassis Intrusion Detector Input
WATCHDOG Comparison of all Monitored Values
SMBus 1.0 (LM81C) and 1.1 (LM81B) Serial Bus Interface Compatibility
LM81B has Improved Voltage Monitoring Accuracy
VID0-VID4 Monitoring Inputs

Key Specifications

Voltage Monitoring Error: +2% or ±1.2% (max)
Temperature Error
- −40?C to +125?C ± 3?C (max)
Supply Voltage Range: 2.8V to 3.8V
Supply Current: 0.4 mA (typ)
ADC and DAC Resolution: 8 Bits
Temperature Resolution: 0.5°C

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