HTU21D(F) Sensor
Digital Relative Humidity sensor with Temperature output
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•
•
•
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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
HTU21D(F), the new digital humidity sensor with temperature output of MEAS is about to set new standards in
terms of size and intelligence: Embedded in a reflow solderable Dual Flat No leads (DFN) package of 3 x 3 mm
foot print and 0.9 mm height it 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 humidity and temperature digital outputs. HTU21D(F) digital humidity sensors
are low power consumption 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. Furthermore, the resolution of
HTU21D(F) digital humidity sensor can be changed by command (8/12bit up to 12/14bit for RH/T), low battery
can be detected and a checksum improves communication reliability.
With made improvements and the miniaturization of the sensor the performance-to-price ratio has been
improved – and eventually, any device should benefit from the cutting edge energy saving operation mode.
Optional PTFE filter/membrane (F) protects HTU21D digital humidity sensors with temperature output against
dust, water immersion as well as against contamination by particles. PTFE filter/membrane preserves a high
response time. The white PTFE filter/membrane is directly stuck on the sensor housing.
FEATURES
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Full interchangeability with no calibration required
in standard conditions
Instantaneous desaturation after long periods in
saturation phase
Compatible with automatized assembly processes,
including Pb free and reflow processes
Individual marking for compliance to stringent
traceability requirements
APPLICATIONS
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Automotive: defogging, HVAC
Home Appliance
Medical
Printers
Humidifier
HPC199_2 HTU21D(F) Sensor Datasheet
www.meas-spec.com
1/19
July 2013
HTU21D(F) Sensor
Digital Relative Humidity sensor with Temperature output
NOMENCLATURE
HTU2XY(F)
With embedded PTFE filter: HTU2XYF
Output Sensor:
Y = D for Digital, I2C protocol
= P for PWM interface, analog output
= S for SDM interface convertible to analog output
Humidity accuracy :
X = 0:
+/-5%RH tolerance @55%RH
= 1:
+/-3%RH tolerance @55%RH
HTU2XY Modules
HTU2XF Modules
PERFORMANCE SPECS
MAXIMUM RATINGS
Ratings
Storage Temperature
Supply Voltage (Peak)
Humidity Operating Range
Temperature Operating Range
VDD to GND
Digital I/O pins (DATA/SCK) to VDD
Input current on any pin
Peak conditions:
less than 10% of the operating time
Symbol
T
stg
V
cc
RH
T
a
Value
-40 to 125
3.8V
0 to 100
-40 to +125
-0.3 to 3.6V
-0.3 to VDD+0.3
-10 to +10
Unit
°
C
V
dc
%RH
°
C
V
V
mA
Exposure to absolute maximum rating conditions for extended periods may affect the sensor reliability.
HPC199_2 HTU21D(F) Sensor Datasheet
www.meas-spec.com
2/19
July 2013
HTU21D(F) Sensor
Digital Relative Humidity sensor with Temperature output
ELECTRICAL AND GENERAL ITEMS
(@T = 25° @Vdd = 3V)
C,
Characteristics
Voltage Supply
Current
consumption
(1)
Symbol
VDD
Sleep mode
Measuring
Sleep mode
Average 8bit
VDD=3V
(2)
Min
1.5
300
Typ
3.0
0.02
450
0.06
2.7
Max
3.6
0.14
500
0.5
Unit
V
µA
µA
µW
µW
idd
Power Dissipation
Communication
Heater
digital 2-wire interface, I²C protocol
5.5mW/∆T=+0.5-1.5°
C
-40° /125°
C
C
Storage
(1)
Conditions: V
dd
= 3V, SCK= 400kHz at 25°C
(2)
Conditions: V
dd
= 3V, SCK= 400kHz, Temp<60° duty cycle <10%
C,
SENSOR PERFORMANCE
RELATIVE HUMIDITY
(@T = 25° @Vdd = 3V)
C,
Characteristics
Resolution
Humidity Operating Range
Relative Humidity Accuracy
@25° (20%RH to 80%RH)
C
Replacement
Temperature coefficient (from 0° to 80°
C
C)
Humidity Hysteresis
12 bits
Measuring Time
(1)
Symbol
12 bits
8 bits
RH
typ
max
T
cc
Min
Typ
0.04
0.7
Max
Unit
%RH
%RH
0
±2
±3
fully interchangeable
-0.10
±1
14
7
4
2
100
±5
-0.15
16
8
5
3
±10
%RH
%RH
%RH
%RH/°
C
%RH
ms
ms
ms
ms
LSB
s
%RH/yr
11 bits
10 bits
8 bits
PSRR
Recovery time after 150 hours of condensation
Long term drift
(2)
t
10
0.5
Response Time (at 63% of signal) from 33 to 75%RH
τ
RH
5
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
HPC199_2 HTU21D(F) Sensor Datasheet
www.meas-spec.com
3/19
July 2013
HTU21D(F) Sensor
Digital Relative Humidity sensor with Temperature output
RELATIVE HUMIDITY ERROR BUDGET CONDITIONS AT 25°
C
HTU21D(F) sensors are specified for optimum accuracy measurements within 5 to 95%RH.
Operation out of this range (< 5% or > 95% RH, including condensation) is however possible.
TEMPERATURE COEFFICIENT COMPENSATION EQUATION
Using the following temperature coefficient compensation equation will guarantee Relative Humidity accuracy
given p.3, from
0°C to 80°C:
RH
compensatedT
=
RH
actualT
+
(25
−
T
actual
)
×
CoeffTemp
RH
actualT
T
actual
CoeffTemp
TEMPERATURE
Characteristics
Resolution
Temperature Operating Range
Temperature Accuracy @25°
C
Replacement
14 bit
Measuring time
(1)
13 bit
12 bit
11 bit
PSSR
Long term drift
(2)
Ambient humidity in %RH, computed from HTU21D(F) sensor
Humidity cell temperature in ° computed from H TU21D(F) sensor
C,
Temperature coefficient of the HTU21D(F) in %RH/°
C
Symbol
14 bit
12 bit
T
typ
max
Min
Typ
0.01
0.04
Max
Unit
°
C
°
C
-40
±0.3
±0.4
+125
°
C
°
C
°
C
fully interchangeable
44
22
11
6
0.04
50
25
13
7
±25
ms
ms
ms
ms
LSB
°
C/yr
Response Time (at 63% of signal) from 15° to 45°C
C
τ
T
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
HPC199_2 HTU21D(F) Sensor Datasheet
www.meas-spec.com
4/19
July 2013
HTU21D(F) Sensor
Digital Relative Humidity sensor with Temperature output
TEMPERATURE ERROR BUDGET
USER GUIDE HTU21D(F)
APPLICATION INFORMATION
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Soldering instructions: Lead free reflow soldering recommended process
For soldering HTU21D(F) sensor standard reflow soldering ovens may be used.
HTU21D(F) sensor as a humidity sensitive component (as classified by IPC/JEDEC J-STD-020 or equivalent
documented procedure with peak temperature at 240° during up to 30 seconds for Pb-free assembly in
C
IR/convection reflow ovens) must be handled in a manner consistent with IPC/JEDEC J-STD-033 or an
equivalent documented procedure. IPC-1601 provides humidity control, handling and packing of PCBs.
The H T U 2 1 D ( F ) s ensor is qualified to withstand one lead free reflow soldering recommended process
profile below according to JEDEC standard.
Mount parts within 24 hours after printing solder paste to avoid potential dry up.
For manual soldering, contact time must be limited to 5 seconds at up to 350°
C.
HPC199_2 HTU21D(F) Sensor Datasheet
www.meas-spec.com
5/19
July 2013
Microchip MCU
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