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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LM87 데이터시트(PDF) 1 Page - National Semiconductor (TI) |
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LM87 데이터시트(HTML) 1 Page - National Semiconductor (TI) |
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1 / 32 page  LM87 Serial Interface System Hardware Monitor with Remote Diode Temperature Sensing General Description The LM87 is a highly integrated data acquisition system for hardware monitoring of servers, Personal Computers, or virtually any microprocessor-based system. In a PC, the LM87 can be used to monitor power supply voltages, moth- erboard and processor temperatures, and fan speeds. Ac- tual values for these inputs can be read at any time. Pro- grammable WATCHDOG limits in the LM87 activate a fully programmable and maskable interrupt system with two out- puts (INT# and THERM#). The LM87 has an on-chip digital output temperature sensor with 8-bit resolution as well as the capability of monitoring 2 external diode temperatures to 8-bit resolution, an 8 channel analog input ADC with 8-bit resolution and an 8-bit DAC. A channel on the ADC measures the supply voltage applied to the LM87, nominally 3.3 V. Two of the ADC inputs can be redirected to a counter that can measure the speed of up to 2 fans. A slow speed Σ∆ ADC architecture allows stable measurement of signals in an extremely noisy environment. The DAC, witha0to2.5V output voltage range, can be used for fan speed control. Additional inputs are provided for Chassis Intrusion detection circuits, and VID monitor inputs. The VID monitor inputs can also be used as IRQ inputs if VID monitoring is not required. The LM87 has a Serial Bus interface that is compatible with SMBus™ and I 2C™. Features n Remote diode temperature sensing (2 channels) n 8 positive voltage inputs with scaling resistors for monitoring +5 V, +12 V, +3.3 V, +2.5 V, Vccp power supplies directly n 2 inputs selectable for fan speed or voltage monitoring n 8-bit DAC output for controlling fan speed n Chassis Intrusion Detector input n WATCHDOG comparison of all monitored values n SMBus or I 2C Serial Bus interface compatibility n VID0-VID4 or IRQ0-IRQ4 monitoring inputs n On chip temperature sensor Key Specifications j Voltage Monitoring Error ±2 % (max) j External Temperature Error ±4 ˚C (max) j Internal Temperature Error −40 ˚C to +125 ˚C ± 3 ˚C (typ) j Supply Voltage Range 2.8 to 3.8 V j Supply Current 0.7 mA (typ) j ADC and DAC Resolution 8 Bits j Temperature Resolution 1.0 ˚C Applications n System Thermal and Hardware Monitoring for Servers, Workstations and PCs n Networking and Telecom Equipment n Office Electronics n Electronic Test Equipment and Instrumentation Ordering Information Temperature Range NS Package Number −40 ˚C ≤ T A ≤ +125 ˚C Order Number Device Marking LM87CIMT 1 LM87CIMT MTC24B LM87CIMTX 2 LM87CIMT MTC24B Note: 1-Rail transport media, 61 parts per rail 2-Tape and reel transport media, 2500 parts per reel Connection Diagram 10099503 SMBus™ is a trademark of the Intel Corporation. December 2003 © 2003 National Semiconductor Corporation DS100995 www.national.com |
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