HDC3020
SNAS778 – JUNE 2021
www.ti.com
7 Detailed Description
7.1 Overview
The HDC302x is an integrated digital interface sensor that incorporates both humidity-sensing and temperature-
sensing elements, an analog-to-digital converter, calibration memory, and an I2C compatible interface in a
2.50-mm × 2.50-mm, 8-pin WSON package. The HDC302x also provides excellent measurement accuracy.
The HDC302x measures relative humidity through variations in the capacitance of a polymer dielectric. As with
most relative humidity sensors that include this type of technology, care must be taken to ensure optimal device
performance for the sensing element. This includes:
•
Follow the correct storage and handling procedures during board assembly. See HDC3x Silicon User's Guide
(SNAU265) for these guidelines.
•
•
Protect the sensor from contaminants during board assembly and operation.
Reduce prolonged exposure to both high temperature and humidity extremes that may impact sensor
accuracy.
•
Follow the correct layout guidelines for best performance. See Optimizing Placement and Routing for
Humidity Sensors (SNAA297) for these guidelines.
7.2 Functional Block Diagram
HDC3
VDD
SCL
SDA
Calibration
ADC
ALERT
ADDR
ADDR1
Linearization
I2C
RH Sensor
T Sensor
RESET
GND
7.3 Feature Description
7.3.1 Factory Installed Polyimide Tape
The HDC3021 has a polyimide tape to cover the opening of the humidity sensor element. The tape protects the
humidity sensor element from pollutants that can be produced as part of the manufacturing process, such as
SMT assembly, printed circuit board (PCB) wash, and conformal coating. The tape must be removed after the
final stages of assembly for accurate measurement of relative humidity in the ambient environment. The tape
can withstand at least three standard reflow cycles.
To remove the polyimide tape from the humidity sensor element, TI recommends to use a ESD-safe tweezer to
grip the adhesive-free tab in the top right corner, and slowly peel the adhesive from the top-right corner towards
the bottom-left corner in an upward direction (as opposed to across the surface). This will help to reduce the risk
of scratching the humidity sensor element.
7.3.2 Factory Installed IP67 Protection Cover
HDC3022 has an IP67 rated PTFE permanent filter to cover the opening of the humidity sensor element. The
cover is a hydrophobic micropourous PTFE foil that protects the humidity sensor element against dust and water
according to IP67 specifications. The cover is designed to adhere to the package over lifetime operation while
maintaining the same response time as a sensor without the membrane. The cover has a filtration efficiency of
99.99% down to a particle size of 100 nm.
7.3.3 Measurement of Relative Humidity and Temperature
The HDC302x supports measurements of Relative Humidity and Temperature. The supported Relative Humidity
Range is 0% to 100% and the supported Temperature Range is from –40°C to 125°C. Each measurement is
represented in a 16-bit format, and the conversion formulas are documented below:
Copyright © 2021 Texas Instruments Incorporated
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