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HDC1050 Datasheet(PDF) 9 Page - Texas Instruments |
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HDC1050 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 27 page ADC TEMPERATURE RH I 2C Registers + Logic HDC1050 SDA SCL OTP Calibration Coefficients VDD GND HDC1050 www.ti.com SNAS658C – MAY 2015 – REVISED DECEMBER 2015 8 Detailed Description 8.1 Overview The HDC1050 is a digital humidity sensor with integrated temperature sensor that provides excellent measurement accuracy at very low power. The sensing element of the HDC1050 is placed on the top part of the device. Measurement results can be read out through the I2C compatible interface. Resolution is based on the measurement time and can be 8, 11, or 14 bits for humidity; 11 or 14 bits for temperature. 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 Power Consumption One of the key features of the HDC1050 is its low power consumption, which makes the device suitable in battery or power harvesting applications. In these applications the HDC1050 spends most of the time in sleep mode: with a typical 100nA of current consumption in sleep mode, the averaged current consumption is minimal. Its low consumption in measurement mode minimizes any self-heating. 8.3.2 Voltage Supply Monitoring The HDC1050 monitors the supply voltage level and indicates when the voltage supply of the HDC1050 is less than 2.8V. This information is useful in battery-powered systems in order to inform the user to replace the battery. This is reported in the BTST field (register address 0x02:bit[11]) which is updated after POR and after each measurement request. 8.3.3 Heater The heater is an integrated resistive element that can be used to test the sensor or to drive condensation off the sensor. The heater can be activated using HEAT, bit 13 in the Configuration Register. The heater helps in reducing the accumulated offset after long exposure at high humidity conditions. Once enabled the heater is turned on only in the measurement mode. To accelerate the temperature increase it is suggested to increase the measurement data rate. 8.4 Device Functional Modes The HDC1050 has two modes of operation: sleep mode and measurement mode. After power up, the HDC1050 is in sleep mode. In this mode, the HDC1050 waits for I2C input including commands to configure the conversion times, read the status of the battery, trigger a measurement, and read measurements. Once it receives a command to trigger a measurement, the HDC1050 moves from sleep mode to measurement mode. After completing the measurement the HDC1050 returns to sleep mode. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: HDC1050 |
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