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What is HTU21DF?

This electronic component, produced by the manufacturer "Measurement", performs the same function as "Digital Relative Humidity sensor".


HTU21DF Datasheet PDF - Measurement

Part Number HTU21DF
Description Digital Relative Humidity sensor
Manufacturers Measurement 
Logo Measurement Logo 


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HTU21D(F) Sensor
Digital Relative Humidity sensor with Temperature output
DFN type package
Relative Humidity and Temperature Digital Output, I²C
interface
Fully calibrated
Lead free sensor, reflow solderable
Low power consumption
Fast response time
DESCRIPTION
The HTU21D(F) is a new digital humidity sensor with temperature output by MEAS. Setting new standards in
terms of size and intelligence, it is embedded in a reflow solderable Dual Flat No leads (DFN) package with a
small 3 x 3 x 0.9 mm footprint. This sensor provides calibrated, linearized signals in digital, I²C format.
HTU21D(F) digital humidity sensors are dedicated humidity and temperature plug and play transducers for OEM
applications where reliable and accurate measurements are needed. Direct interface with a micro-controller is
made possible with the module for humidity and temperature digital outputs. These low power sensors are
designed for high volume and cost sensitive applications with tight space constraints.
Every sensor is individually calibrated and tested. Lot identification is printed on the sensor and an electronic
identification code is stored on the chip which can be read out by command. Low battery can be detected and
a checksum improves communication reliability. The resolution of these digital humidity sensors can be changed
by command (8/12bit up to 12/14bit for RH/T).
With MEAS’ improvements and miniaturization of this sensor, the performance-to-price ratio has been improved
and eventually, any device should benefit from its cutting edge energy saving operation mode.
Optional PTFE filter/membrane (F) protects HTU21D digital humidity sensors against dust and water immersion,
as well as against contamination by particles. PTFE filter/membranes preserve a high response time. The white
PTFE filter/membrane is directly stuck on the sensor housing.
FEATURES
APPLICATIONS
Full interchangeability with no calibration required Automotive: defogging, HVAC
in standard conditions
Home Appliance
Instantaneous desaturation after long periods in
Medical
saturation phase
Printers
Compatible with automatized assembly processes, Humidifier
including Pb free and reflow processes
Individual marking for compliance to stringent
traceability requirements
HPC199_3 HTU21D(F) Sensor Datasheet
www.meas-spec.com
1/21
October 2013
Free Datasheet http://www.datasheet-pdf.com/

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HTU21DF equivalent
HTU21D(F) Sensor
Digital Relative Humidity sensor with Temperature output
TEMPERATURE
Characteristics
Symbol
Min Typ
Max Unit
Resolution
14 bit
12 bit
0.01 °C
0.04 °C
Temperature Operating Range
T -40
+125
°C
Temperature Accuracy @25°C
typ
max
±0.3
See graph 2
°C
°C
Replacement
fully interchangeable
14 bit
44 50 ms
Measuring time (1)
13 bit
12 bit
22 25 ms
11 13 ms
11 bit
6 7 ms
PSSR
±25 LSB
Long term drift
0.04 °C/yr
Response Time (at 63% of signal) from 15°C to 45°C (2)
τT
10 s
(1) Typical values are recommended for calculating energy consumption while maximum values shall be applied for
calculating waiting times in communication.
(2) At 1m/s air flow
GRAPH 2 : TEMPERATURE ERROR BUDGET
2
1,8
1,6
1,4
1,2
1
0,8
0,6
0,4
0,2
0
-40 -20 0
Maximal Tolerance
Typical Tolerance
20 40 60
Temperature (°C)
80
100 120
USER GUIDE HTU21D(F)
APPLICATION INFORMATION
Soldering instructions: Lead free reflow soldering recommended process
For soldering HTU21D(F) sensor standard reflow soldering ovens may be used.
HPC199_3 HTU21D(F) Sensor Datasheet
www.meas-spec.com
5/21
October 2013
Free Datasheet http://www.datasheet-pdf.com/


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