Linear公司的LTC2991是八路I2C串口的系統(tǒng)電壓,電流和溫度監(jiān)測器,溫度測量精度為0.7度C,分辨率為0.06度C,PWM溫度輸出,采用14位ADC來測量電壓/電流,工作電壓3V到5.5V,內(nèi)部有10ppm/℃的基準電壓,主要用在溫度測量,電源監(jiān)測,電流測量,遙控數(shù)據(jù)采集和環(huán)境監(jiān)測.本文介紹了LTC2991主要特性,方框圖,以及包括馬達保護和調(diào)整電路, 計算機電壓和溫度監(jiān)測電路與電池監(jiān)測電路在內(nèi)的多種應(yīng)用電路.
LTC2991: Octal I2C Voltage, Current, and Temperature Monitor
The LTC.2991 is used to monitor system temperatures, voltages and currents. Through the I2C serial interface, the eight monitors can individually measure supply voltages and can be paired for differential measurements of current sense resistors or temperature sensing transistors.
Additional measurements include internal temperature and internal VCC. The internal 10ppm reference minimizes the number of supporting components and area required.Selectable address and configurable functionality give the LTC2991 flexibility to be incorporated in various systems needing temperature, voltage or current data. The LTC2991 fits well in systems needing submillivolt voltage resolution, 1% current measurement and 1℃ temperature accuracy or any combination of the three.
LTC2991主要特性:
Measures Voltage, Current, Temperature
Measures Four Remote Diode Temperatures
0.7℃ (Typ) Accuracy, 0.06℃ Resolution
1℃ (Typ) Internal Temperature Sensor
Series Resistance Cancellation
14-Bit ADC Measures Voltage/Current
PWM Temperature Output
3V to 5.5V Supply Operating Voltage
Eight Selectable Addresses
Internal 10ppm/℃ Voltage Reference
V1 to V8 Inputs ESD Rated to 6kV HBM
16-Lead MSOP Package
LTC2991應(yīng)用:
Temperature Measurement
Supply Voltage Monitoring
Current Measurement
Remote Data Acquisition
Environmental Monitoring
圖1.LTC2991方框圖
圖2.LTC2991典型應(yīng)用電路圖
圖3.LTC2991高電壓/電流和溫度監(jiān)測電路圖
圖4.LTC2991計算機電壓和溫度監(jiān)測電路圖
圖5.LTC2991馬達保護和調(diào)整電路圖
圖6.LTC2991大型馬達保護和調(diào)整電路圖
圖7.LTC2991風扇/空氣過濾器/溫度告警電路圖
圖8.LTC2991電池監(jiān)測電路圖
圖9.干濕球濕度計電路
圖10.風向標電路
圖11.帶電源監(jiān)視的烤箱控制電路
圖12.帶擴展ESD性能的溫度遙測電路
圖13.采用LTC2991一路和雙線對的四路溫度遙測電路 |
