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參數(shù)資料
| 型號： | LM87 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Serial Interface System Hardware Monitor with Remote Diode Temperature Sensing |
| 中文描述： | 串行接口系統(tǒng)硬件監(jiān)控與遠程二極管溫度傳感器 |
| 文件頁數(shù)： | 1/32頁 |
| 文件大小： | 470K |
| 代理商： | LM87 |
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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, with a 0 to 2.5 V 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
2
C
.
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
2
C Serial Bus interface compatibility
n
VID0-VID4 or IRQ0-IRQ4 monitoring inputs
n
On chip temperature sensor
Key Specifications
j
Voltage Monitoring Error
j
External Temperature Error
j
Internal Temperature Error
40 C to +125 C
j
Supply Voltage Range
j
Supply Current
j
ADC and DAC Resolution
j
Temperature Resolution
±
2 % (max)
±
4 C (max)
±
3 C (typ)
2.8 to 3.8 V
0.7 mA (typ)
8 Bits
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
40 C
≤
T
A
≤
+125 C
Order Number
LM87CIMT
1
LM87CIMTX
2
NS Package
Number
Device Marking
LM87CIMT
LM87CIMT
MTC24B
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
L
2003 National Semiconductor Corporation
DS100995
www.national.com
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM87CIMT | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| LM87CIMT | 制造商:Texas Instruments 功能描述:HDW MON, 2 REMOTE TEMP SENS, SMD 制造商:Texas Instruments 功能描述:HDW MON, 2 REMOTE TEMP SENS, SMD; IC Output Type:Voltage; Sensing Accuracy Range: 3C; Sensing Temperature Min:-40C; Sensing Temperature Max:+125C; Supply Voltage Min:2.8V; Supply Voltage Max:3.8V; Sensor Case Style:TSSOP; No. of ;RoHS Compliant: Yes |
| LM87CIMT/NOPB | 功能描述:板上安裝溫度傳感器 Hdw Mon & 2 Remote Temp Sens RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| LM87CIMTX | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| LM87CIMTX/NOPB | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
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