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Si705x低功耗高精度I2C溫度傳感器測量方案

文章來源：更新時間：2015/1/29 9:41:00

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Silabs公司的Si705x系列是低功耗高精度I2C數字溫度傳感器,具有能帶隙溫度傳感器特性,集成了14位ADC,信號處理,校準數據和I2C接口,工作電壓1.9V-3.6V,工作溫度–40 到+125 ℃,精度從±0.3 ℃到±1.0 ℃,主要用在HVAC/R, 電熱調節器,冷鏈存儲,白色家當,計算機設備,手提消費類電子設備,資產跟蹤等.本文介紹了Si705x系列主要特性,框圖, 溫度測量應用電路圖,以及溫度和濕度傳感器評估板主要特性,電路圖和PCB布局圖.
The Si705x Digital Temperature Sensors offer industry-leading low power consumption and high accuracy across the entire operating voltage and temperature range. These monolithic CMOS ICs feature a band-gap temperature sensor element, an analog-to-digital converter with up to 14-bit resolution, signal processing, calibration data, and an I2C interface.
The patented use of novel signal processing and analog design enables the sensors to maintain their accuracy over a wide temperature and voltage range, while consuming very little current.
The temperature sensors are factory-calibrated and the calibration data is stored in the on-chip non-volatile memory. This ensures that the sensors are fully interchangeable, with no recalibration or software changes required.
The Si705x devices are available in a 3x3 mm DFN package, and the industry-standard I2C interface can operate at up to 400 kHz. Requiring just 195nA of average current when sampled once per second, the Si705x can operate for several years with just a single coin cell battery.
The Si705x devices offer an accurate, low-power, factory-calibrated digital solution ideal for measuring temperature in applications ranging from HVAC/R and asset tracking to industrial and consumer platforms.

Si705x主要特性:
 High Accuracy Temperature Sensors
Si7053: ±0.3 ℃ (max)
Si7054: ±0.4 ℃ (max)
Si7055: ±0.5 ℃ (max)
Si7050: ±1.0 ℃ (max)
 Wide operating voltage (1.9 to 3.6 V)
 –40 to +125 ℃ operating range
 Accuracy maintained over the entire operating temperature and voltage range
 Low Power Consumption
 195 nA average current @ 1 Hz sample rate
 14-bit resolution
 Factory calibrated
 I2C interface
 3x3 mm DFN package
Si705x應用:
 HVAC/R
 Thermostats
 White goods
 Computer equipment
 Portable consumer devices
 Asset tracking
 Cold chain storage
 Battery protection
 Industrial controls
 Medical equipment

圖1. Si705x框圖

圖2. Si705x溫度測量應用電路圖

溫度測量應用電路圖材料清單:

溫度和濕度傳感器評估板

The Si705x temperature sensor evaluation kits and accompanying graphical user interface software allow quick and easy access to the features and functions of the Si705x temperature sensor family while enabling the evaluation of the sensor’s performance. Four different kits are available, depending on the accuracy desired. All of the supported evaluation kits contain the following items:
Si7013USB-DONGLE evaluation board consisting of one Si7013 sensor as well as USB interface and circuitry for evaluation of the Si7013 with thermistor or other analog input
3-foot flat cable to connect the “postage stamp” boards to the USB dongle USB extender cable
Windows graphical user interface software for complete control of the Si70xx sensors (Windows XP, VISTA, or 7 required)Depending on the kit, different postage stamp boards are supplied as well.
The Si7013USB-Dongle kit has Si7013,Si7020 and Si7021 I2C postage stamp boards.
The Si7022-23-EVB kit contains Si7022 and Si7023 PWM output boards.
The Si7006-07-EVB kit contains Si7006 and Si7007 low-cost postage stamp boards.
The Si7050/3/4/5-EVB kits contain the appropriate Si7050, Si7053, Si7054 or Si7055 temperature sensor postage stamp.
Using the Si7013 USB-dongle, the Windows GUI will also support “postage stamp” size boards for the Si7005 first-generation temperature and humidity sensor in a 4x4 mm package (Si7005-EB) as well as the Si7015 pin-compatible upgrade of this part (Si7015-EB).
The Windows* GUI will also support the older version Si7005USB-dongle although not all features of the newer parts can be evaluated in this case.

圖3. Si7013USB-DONGLE外形圖

溫度和濕度傳感器評估板包括:
USB dongle control board
Si7050-EB, Si7053-EB, Si7054-EB or Si7055-EB "postage stamp" daughter board
3 ft. flat ribbon cable
USB extension cable