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HDC2021 Datasheet Preview

HDC2021 Datasheet

Low-Power Humidity and Temperature Sensor

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HDC2021
SNAS773A – DECEMBER 2019 – REVISEDHJDUNCE22002210
SNAS773A – DECEMBER 2019 – REVISED JUNE 2020
HDC2021 High-Accuracy, Low-Power Humidity and Temperature Sensor With
Assembly Protection Cover
1 Features
• Factory-installed polyimide tape to protect sensor
during assembly
• RH measurement range: 0% to 100%
• Temperature measurement range: –40°C to 125°C
• Humidity accuracy: ±2% (typical), ±3% (maximum)
• Temperature accuracy: ±0.2°C (typical), ±0.4°C
(maximum)
• Supply voltage range: 1.62 V to 3.6 V
• I2C interface compatibility
• 50 nA sleep mode current
• 550 nA average supply current (11-bit accuracy
option, 1 measurement/second)
• Continuous conversion or one-shot measurement
mode
• Backward-compatible with HDC2080
2 Applications
• Thermostats
• Smart speakers (with voice assistant)
• Washers and dryers
• HVAC sensor transmitters (temperature, pressure,
and humidity)
• HVAC system controllers
• Wireless environmental sensors
HDC2021
RH
Sensor
Registers
ADC
+
Temperature
Logic
Sensor
VDD
VDD
VDD
SCL
SDA
I2C DRDY/INT
ADDR
I2C
Master
GPIO
MCU
Calibration
GND
GND
Typical Application
3 Description
The HDC2021 is an integrated relative humidity and
temperature sensor with a factory-installed polyimide
tape cover over the opening of the relative humidity
sensor element. The tape cover provides protection
against pollutants that can appear in certain stages of
the manufacturing process, such as SMT assembly,
PCB board wash, and conformal coating. The tape
design allows for a full conformal coating of the PCB,
and includes an adhesive free corner tab for quick
removal using tweezers.
The HDC2021 device is backward-compatible with the
HDC2080, providing high accuracy measurements
with very low power consumption in a small DFN
package. The capacitive-based sensor includes new
integrated digital features and a heating element to
dissipate condensation and moisture. The HDC2021
digital features include programmable interrupt
thresholds to provide alerts and system wake-ups
without requiring a microcontroller to continuously
monitor the system. Combined with programmable
sampling intervals, low power consumption, and 1.8-V
supply voltage support, the HDC2021 is designed for
ultra-low power battery-operated systems.
Device Information
PART NUMBER
HDC2021
PACKAGE (1)
WSON (6)
BODY SIZE (NOM)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
10
Typical
9
8
7
6
5
4
3
2
1
0
0
10
20
30
40
50
60
70
80
90 100
RH (%RH)
RH Accuracy (TA = 30°C)
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
Copyrighint t©el2le0c2t0uTael xparsoIpnesrtrtuymmeanttsteIrnscoarnpdoraottehder important disclaimers. PRODUCTION DATA.
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etcTI

HDC2021 Datasheet Preview

HDC2021 Datasheet

Low-Power Humidity and Temperature Sensor

No Preview Available !

HDC2021
SNAS773A – DECEMBER 2019 – REVISED JUNE 2020
www.ti.com
Table of Contents
1 Features............................................................................1
2 Applications..................................................................... 1
3 Description.......................................................................1
4 Revision History.............................................................. 2
5 Pin Configuration and Functions...................................3
Pin Functions.................................................................... 3
6 Specifications.................................................................. 4
6.1 Absolute Maximum Ratings........................................ 4
6.2 ESD Ratings............................................................... 4
6.3 Recommended Operating Conditions.........................4
6.4 Thermal Information....................................................4
6.5 Electrical Characteristics.............................................5
6.6 Switching Characteristics............................................6
6.7 Timing Diagram...........................................................7
6.8 Typical Characteristics................................................ 8
7 Detailed Description......................................................10
7.1 Overview................................................................... 10
7.2 Functional Block Diagram......................................... 10
7.3 Feature Description...................................................11
7.4 Device Functional Modes..........................................18
7.5 Programming............................................................ 18
7.6 Register Maps...........................................................20
8 Application and Implementation.................................. 33
8.1 Application Information............................................. 33
8.2 Typical Application.................................................... 33
9 Power Supply Recommendations................................35
10 Layout...........................................................................35
10.1 Layout Guidelines................................................... 35
10.2 Layout Example...................................................... 36
11 Device and Documentation Support..........................37
11.1 Documentation Support.......................................... 37
11.2 Receiving Notification of Documentation Updates.. 37
11.3 Support Resources................................................. 37
11.4 Trademarks............................................................. 37
11.5 Electrostatic Discharge Caution.............................. 37
11.6 Glossary.................................................................. 37
12 Mechanical, Packaging, and Orderable
Information.................................................................... 38
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from December 19, 2019 to June 26, 2020 (from Revision * (December 2019) to
Revision A (June 2020))
Page
• Changed data sheet status from Advanced Information to Production Data......................................................1
• Updated the numbering format for tables, figures, and cross-references throughout the document..................1
2
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Copyright © 2020 Texas Instruments Incorporated



Part Number HDC2021
Description Low-Power Humidity and Temperature Sensor
Maker etcTI
Total Page 3 Pages
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