peculiarity
Temperature sensing
6 Scale resistors positive voltage input to the display of +5 V, +12 V, +3.3 V, +2.5 V, VCCP power supply directly
The 8-bit DAC output controls the fan speed
2. Fan speed monitoring input
Chassis security monitor input
Watchdog comparison of all monitored values
(LM81C) SMBus™1.0 and 1.1 (LM81B) serial bus interface compatibility
The LM81B improves voltage monitoring accuracy
VID0 - VID4 monitors the input
illustrate
The LM81 is a highly integrated data acquisition system for hardware servers, PCs, or virtually any microprocessor-based system monitoring. In a single PC, the LM81 can be used to monitor power supply voltage, temperature, and fan speed. The actual value of these investments can be read at any time. The LM81 programmable watchdog limits the activation of a fully programmable and shielded interrupt system with two outputs (INT# as well as T_CRIT_#).
The LM81 is available with 9- or 12-bit resolution, 6-bit and 8-bit resolution analog input ADC and an 8-bit DAC chip with a digital output temperature sensor. Two fan tachometer outputs measure the FM81's FAN1 and FAN2 inputs. The DAC has an output voltage range of 0 to 1.25V and can be used for fan speed control. Provide chassis intrusion detection circuit, and VID monitoring investment more investment. The LM81 has an SMBus-compatible™ serial bus interface.
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 (typical)
ADC and DAC resolution 8-bit
Temperature resolution 0.5°C
apply
Thermal and hardware monitoring systems, servers and personal computers
Office electronics
Electronic test equipment and instrumentation