基于HDC2010的低功耗濕度和溫度數(shù)字傳感器解決方案

TI公司的HDC2010是低功耗高精度濕度和溫度數(shù)字傳感器，相對(duì)濕度范圍0%-100%，濕度精度±2%，溫度范圍–40℃ - 125℃，溫度精度±0.2℃，睡眠電流50nA，超緊湊WLCSP封裝，工作電壓1.8V，主要用在智能恒溫器，電冰箱，冷凍運(yùn)輸車，洗衣機(jī)/干燥機(jī)，HVAC系統(tǒng)，氣體檢測(cè)，通信設(shè)備，環(huán)境檢測(cè)標(biāo)簽，煙霧和熱檢測(cè)器，噴墨打印機(jī)，監(jiān)視照相機(jī)，CPAP機(jī)器和可穿戴電子。本文介紹了HDC2010主要特性，功能框圖和應(yīng)用電路，以及評(píng)估模塊HDC2010EVM特性，電路圖，材料清單和PCB設(shè)計(jì)圖。

The HDC2010 is an integrated humidity andtemperature sensor that provides high accuracymeasurements with very low power consumption， inan ultra-compact WLCSP （Wafer Level Chip ScalePackage）。 The sensing element of the HDC2010 isplaced on the bottom part of the device， which makesthe HDC2010 more robust against dirt， dust， and other environmental contaminants. The capacitivebasedsensor includes new integrated digital featuresand a heating element to dissipate condensation andmoisture. The HDC2010 digital features includeprogrammable interrupt thresholds to providealerts/system wakeups without requiring amicrocontroller to be continuously monitoring thesystem. This， combined with programmable samplingintervals， low inherent power consumption， andsupport for 1.8V supply voltage， make the HDC2010well suited for battery-operated systems.

The HDC2010 provides high accuracy measurementcapability for a wide range of environmentalmonitoring applications and Internet of Things （IoT）such as smart thermostats， smart home assistantsand wearables. The HDC2010 can also be used to provide critical temperature and humidity data for coldchain transportation and storage of perishable goodsto help ensure products like food and pharmaceuticalsarrive fresh.

The HDC2010 is factory-calibrated to 0.2°Ctemperature accuracy and 2% relative humidityaccuracy and includes a heating element to burnaway condensation and moisture for increasedreliability. The HDC2010 supports operation from-40℃ to 125℃ and from 0% to 100% relativehumidity.

HDC2010主要特性：

? Relative Humidity Range 0% to 100%

? Humidity Accuracy ±2%

? Sleep Current 50nA

? Average Supply Current （1 measurement persecond）

– RH only （11 bit） 300nA

– RH （11 bit） + Temperature （11 bit） 550nA

? Temperature Range：

– Operating： –40℃ to 85℃

– Functional： –40℃ to 125℃

? Temperature Accuracy： ±0.2℃ typ.

? Supply Voltage： 1.62 V to 3.6 V

? Automatic Sampling Rate （5 Hz， 2 Hz， 1 Hz， 0.2Hz， 0.1 Hz， 1/60 Hz， 1/120 Hz） or On Demand

? I2C Interface

HDC2010應(yīng)用：

? Smart Thermostats

? Smart Home Assistants

? Refrigerators

? Refrigerated Transport

? Washer/Dryers

? HVAC Systems

? Gas Sensing

? Communications Equipment

? Environmental Tags

? Smoke and Heat Detectors

? Inkjet Printers

? Surveillance Cameras

? CPAP Machines

? Wearables

圖1.HDC2010功能框圖

圖2.HDC2010 HVAC典型應(yīng)用電路圖

評(píng)估模塊HDC2010EVM

The Texas Instruments HDC2010EVM evaluation module （EVM） enables designers to evaluate theoperation and performance of the HDC2010 Relative Humidity and Temperature Sensor.

The EVM hosts an MSP430F5528 microcontroller （μC） as well as the HDC2010. The μC is used to controlthe HDC2010 and communicate with a host PC through a USB port. The EVM is designed to be brokeninto two sections if desired. The sensor section can be separated from the μC section so that the user canremotely locate the sensor from the μC section.

圖3.評(píng)估模塊HDC2010EVM外形圖（頂視圖）

圖4.評(píng)估模塊HDC2010EVM電路圖

評(píng)估模塊HDC2010EVM材料清單：

圖5.評(píng)估模塊HDC2010EVM PCB頂層布局圖

圖6.評(píng)估模塊HDC2010EVM PCB底層布局圖