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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(cè)器,溫度測(cè)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(lái)測(cè)量電壓/電流,工作電壓3V到5.5V,內(nèi)部有10ppm/℃的基準(zhǔn)電壓,主要用在溫度測(cè)量,電源監(jiān)測(cè),電流測(cè)量,遙控?cái)?shù)據(jù)采集和環(huán)境監(jiān)測(cè).本文介紹了LTC2991主要特性,方框圖,以及包括馬達(dá)保護(hù)和調(diào)整電路, 計(jì)算機(jī)電壓和溫度監(jiān)測(cè)電路與電池監(jiān)測(cè)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(cè)電路圖
圖4.LTC2991計(jì)算機(jī)電壓和溫度監(jiān)測(cè)電路圖
圖5.LTC2991馬達(dá)保護(hù)和調(diào)整電路圖
圖6.LTC2991大型馬達(dá)保護(hù)和調(diào)整電路圖
圖7.LTC2991風(fēng)扇/空氣過(guò)濾器/溫度告警電路圖
圖8.LTC2991電池監(jiān)測(cè)電路圖
圖9.干濕球濕度計(jì)電路
圖10.風(fēng)向標(biāo)電路
圖11.帶電源監(jiān)視的烤箱控制電路
圖12.帶擴(kuò)展ESD性能的溫度遙測(cè)電路
圖13.采用LTC2991一路和雙線對(duì)的四路溫度遙測(cè)電路 詳情請(qǐng)見(jiàn): 
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