Datasheet > HDC3022DEJR

HDC3022DEJR

更新时间： 2024-01-02 02:29:08

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
51页	2002K
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HDC302x High-Accuracy, Low-Power, Digital Humidity and Temperature Sensor With Ultra-Low Drift

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HDC3022DEJR 数据手册

HDC3020

SNAS778 – JUNE 2021

www.ti.com

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7.3.4 Drift Correction: Accuracy Restoration

Due to contaminants, the natural aging of the sensor's polymer dielectric, and exposure to extreme operating

conditions resulting in long-term drift, the HDC302x offers drift correction to return the device to factory accuracy

specification. Drift correction is available on the EVM today with more details in the HDC3x EVM user's Guide

(SNAU267) and documentation for how to use this drift correction feature on individual devices without the EVM

will be added to the HDC3x Silicon User's Guide (SNAU265) before the device releases to production.

7.3.5 NIST Traceability of Relative Humidity and Temperature Sensor

The HDC302x units are 100% tested on a production setup that is NIST traceable and verified with equipment

that is calibrated to ISO/IEC 17025 accredited standards. This permits design of the HDC302x into applications

such as cold chain management, where the establishment of an unbroken chain of calibrations to known

references is essential.

7.3.6 Measurement Modes: Trigger-On Demand vs. Auto Measurement

Two types of measurement modes are available on the HDC302x: Trigger-on Demand and Auto Measurement

mode.

Trigger-on Demand is a single measurement reading of temperature and relative humidity that is triggered

through an I²C command on an as-needed basis. After the measurement is converted, the device remains in

sleep mode until another I²C command is received.

Auto Measurement mode is a recurring measurement reading of temperature and relative humidity, eliminating

the need to repeatedly initiate a measurement request through an I²C command. The measurement interval

can be adjusted from 1 measurement every 2 seconds to 1 measurement every second. In Auto Measurement

mode, the HDC302x wakes up from sleep to measurement mode based on the selected sampling rate.

Auto Measurement mode helps to reduce overall system power consumption in two ways. First, by removing

the need to repeatedly initiate a measurement through an I²C command, sink current through the SCL and SDA

pullup resistors is eliminated. Secondly, a microcontroller can be programmed into a deep sleep mode, and only

woken up through an interrupt by the ALERT pin in the event of excessive temperature and relative humidity

measurements.

7.3.7 Heater

The HDC302x includes an integrated heating element that can be switched on to prevent or remove

any condensation that may develop when the ambient environment approaches its dew point temperature.

Additionally, the heater can be used to verify functionally of the integrated temperature sensor.

If the dew point of an application is continuously calculated and tracked, and the application firmware is written

such that it can detect a potential condensing situation (or a period of it), a software subroutine can be run, as

a precautionary measure, to activate the onboard heater as an attempt to remove the condensate. The device

shall continue to measure and track the %RH level after the heater is activated. Once the %RH reading goes

to zero % (or near it), the heater can be subsequently turned off to allow the device to cool down. Cooling of

the device can take several minutes, but the temperature measurement will continue to run to ensure the device

goes back to normal operating condition before restarting the device for normal service.

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与HDC3022DEJR相关器件

型号	品牌	获取价格	描述	数据表
HDC3022DEJT	TI	获取价格	HDC302x High-Accuracy, Low-Power, Digital Humidity and Temperature Sensor With Ultra-Low D
HDC302X	TI	获取价格	HDC302x High-Accuracy, Low-Power, Digital Humidity and Temperature Sensor With Ultra-Low D
HDC-30382-CC	MOLEX	获取价格	Wire Terminal,
HDC-3038-CC	MOLEX	获取价格	Wire Terminal,
HDC-305162-CC	MOLEX	获取价格	Wire Terminal,
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HDC30CA	DIODES	获取价格	375W LOW CAPACITANCE TRANSIENT VOLTAGE SUPPRESSOR
HDC30CA-T	DIODES	获取价格	Trans Voltage Suppressor Diode, 375W, 30V V(RWM), Bidirectional, 1 Element, Silicon, PLAST
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