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| 型号： | LM40CIMT/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO14 |
| 封装： | MO-153AB, TSSOP-14 |
| 文件页数： | 1/27页 |
| 文件大小： | 369K |
| 代理商： | LM40CIMT/NOPB |
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LM40
Hardware Monitor with Dual Thermal Diodes and
SensorPath Bus
General Description
The LM40 is a hardware monitor that measures 3 tempera-
ture zones, 5 voltages and has a single-wire interface com-
patible with National Semiconductor’s SensorPath bus. Sen-
sorPath data is pulse width encoded, thereby allowing the
LM40 to be easily connected to many general purpose
micro-controllers. Several National Semiconductor Super I/O
products include a fully integrated SensorPath master, that
when connected to the LM40 can realize a hardware monitor
function that includes limit checking for measured values,
autonomous fan speed control and many other functions.
The LM40 measures the temperature of its own die as well
as two external devices such as a processor thermal diode
or a diode connected transistor. The LM40 can resolve tem-
peratures up to 255C and down to -256C. The operating
temperature range of the LM40 is 0C to +125C. Using
Σ
ADC it measures +1.2V, +2.5V, +3.3V, +5V and +12V analog
input voltages with internal scaling resistors.The address
programming pin allows two LM40s to be placed on one
SensorPath bus.
Features
n
SensorPath Interface
— 2 hardware programmable addresses
n
Voltage Monitoring
— 9-bit
Σ ADC
— Internal scaling resistors for all inputs
— Monitors +1.2V, +2.5 V, +3.3 V, +5 V and +12 V
n
Temperature Sensing
— 2 remote diode temperature sensor zones
— Internal local temperature zone
— 0.5 C resolution
— Measures temperatures up to 140 C
n
14-lead TSSOP package
Key Specifications
n
Voltage Measurement Accuracy
±2 % (max)
n
Temperature Sensor Accuracy
±3 C (max)
n
Temperature Range:
— LM40 junction
0 C to +85 C
— Remote Temp Accuracy
0 C to +100 C
n
Power Supply Voltage
+3.0 V to +3.6 V
n
Average Power Supply Current
0.5 mA (typ)
n
Conversion Time (all Channels)
29.6ms to 1456ms
Applications
n
Microprocessor based equipment
(Motherboards, Video Cards, Base-stations, Routers,
ATMs, Point of Sale, …)
n
Power Supplies
Typical Application
20068401
SensorPath is a trademark of National Semiconductor Corporation
May 2004
LM40
Hardware
Monitor
with
Dual
Thermal
Diodes
and
SensorPath
Bus
2004 National Semiconductor Corporation
DS200684
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM40CIMTX/NOPB | 功能描述:IC HARDWARE MONITOR 14-TSSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 专用 系列:- 标准包装:3,000 系列:- 应用:PDA，便携式音频/视频，智能电话 接口:I²C，2 线串口 电源电压:1.65 V ~ 3.6 V 封装/外壳:24-WQFN 裸露焊盘 供应商设备封装:24-QFN 裸露焊盘（4x4） 包装:带卷 (TR) 安装类型:表面贴装 产品目录页面:1015 (CN2011-ZH PDF) 其它名称:296-25223-2 |
| LM40F1WE26-A | 制造商:CEC Industries 功能描述:LED BULB, MEDIUM SCREW/E26, AMBER, 1W, Lamp Base Type:Medium Screw / E26, LED Co |
| LM40F1WE26-B | 制造商:CEC Industries 功能描述:LED BULB, MEDIUM SCREW/E26, BLUE, 1W, Lamp Base Type:Medium Screw / E26, LED Col |
| LM40F1WE26-G | 制造商:CEC Industries 功能描述:LED BULB, MEDIUM SCREW/E26, GREEN, 1W, Lamp Base Type:Medium Screw / E26, LED Color:Green, Bulb Size:G-40, Power Rating:1W, Wavelength Typ:525nm, Average Bulb Life:240h, Supply Voltage:240V, Current Rating:100mA, Beam Divergence:360, RoHS Compliant: Yes |
| LM40F1WE26-R | 制造商:CEC Industries 功能描述:LED BULB, MEDIUM SCREW/E26, RED, 1W, Lamp Base Type:Medium Screw / E26, LED Color:Red, Bulb Size:G-40, Power Rating:1W, Wavelength Typ:629nm, Average Bulb Life:240h, Supply Voltage:240V, Current Rating:100mA, Beam Divergence:360 , RoHS Compliant: Yes |
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