Linear公司的LTC2991是八路I2C串口的系統電壓,電流和溫度監測器,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(lái)測量電壓/電流,工作電壓3V到5.5V,內部有10ppm/℃的基準電壓,主要用在溫度測量,電源監測,電流測量,遙控數據采集和環(huán)境監測.本文介紹了LTC2991主要特性,方框圖,以及包括馬達保護和調整電路, 計算機電壓和溫度監測電路與電池監測電路在內的多種應用電路.
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典型應用電路圖

圖3.LTC2991高電壓/電流和溫度監測電路圖

圖4.LTC2991計算機電壓和溫度監測電路圖

圖5.LTC2991馬達保護和調整電路圖

圖6.LTC2991大型馬達保護和調整電路圖

圖7.LTC2991風(fēng)扇/空氣過(guò)濾器/溫度告警電路圖


圖8.LTC2991電池監測電路圖

圖9.干濕球濕度計電路

圖10.風(fēng)向標電路

圖11.帶電源監視的烤箱控制電路

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(xiàn)對的四路溫度遙測電路