基于HDC2010的低功耗湿度和温度数字传感器解决方案

TI公司的HDC2010是低功耗高精度湿度和温度数字传感器，相对湿度范围0%-100%，湿度精度±2%，温度范围–40℃ - 125℃，温度精度±0.2℃，睡眠电流50nA，超紧凑WLCSP封装，工作电压1.8V，主要用在智能恒温器，电冰箱，冷冻运输车，洗衣机/干燥机，HVAC系统，气体检测，通信设备，环境检测标签，烟雾和热检测器，喷墨打印机，监视照相机，CPAP机器和可穿戴电子。本文介绍了HDC2010主要特性，功能框图和应用电路，以及评估模块HDC2010EVM特性，电路图，材料清单和PCB设计图。

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应用：

• 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

图1.HDC2010功能框图

图2.HDC2010 HVAC典型应用电路图

评估模块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.

图3.评估模块HDC2010EVM外形图（顶视图）

图4.评估模块HDC2010EVM电路图

评估模块HDC2010EVM材料清单：

图5.评估模块HDC2010EVM PCB顶层布局图

图6.评估模块HDC2010EVM PCB底层布局图