Miniature Digital Relative Humidity and Temperature Sensor - HTU21D

• DFN type package
• Relative Humidity and Temperature Digital Output, I2C interface
• Fully calibrated
• Lead free sensor, reflow solderable
• Low power consumption
• Fast response time
• Full interchangeability with no calibration required in standard conditions
• Instantaneous desaturation after long periods in saturation phase

  • Model Number: HTU21D
  • Data Sheet: Date Sheet File
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  • Miniature Digital Relative Humidity and Temperature Sensor
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Product Specification

HTU21D - Digital Relative Humidity and Temperature Sensor DESCRIPTION 
HTU21D, the new humidity and temperature sensor 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 3mm foot print and 1mm height it provides calibrated, linearized signals in digital, I2C format.

HTU21D 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 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 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 beenimproved – and eventually, any device should benefit from the cutting edge energy saving operation mode.


HTU21D - Digital Relative Humidity and Temperature Sensor Characteristic

   • DFN type package
   • Relative Humidity and Temperature Digital Output, I2C interface
   • Fully calibrated
   • Lead free sensor, reflow solderable
   • Low power consumption
   • Fast response time

HTU21D - Digital Relative Humidity and Temperature Sensor FEATURES
• 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 requirement

HTU21D - Digital Relative Humidity and Temperature Sensor APPLICATIONS 
• Automotive: defogging, HVAC
• Home Appliance
• Medical
• Printers
• Humidifier


HTU21D - Digital Relative Humidity and Temperature Sensor PERFORMANCE SPECS

MAXIMUM RATINGS

Ratings

Symbol

Value

Unit

Storage Temperature

Tstg

-40 to 125

°C

Supply Voltage (Peak)

Vcc

3.8V

Vdc

Humidity Operating Range

RH

0 to 100

%RH

Temperature Operating Range

Ta

-40 to +125

°C

VDD to GND


-0.3 to 3.6V

V

Digital I/O pins (DATA/SCK) to VDD


-0.3 to VDD+0.3

V

Input current on any pin


-10 to +10

mA

 Peak conditions: less than 10% of the operating time


ELECTRICAL AND GENERAL ITEMS
(@T = 25°C, @Vdd = 3V) 

Characteristics

Symbol

Min

Typ

Max

Unit

Voltage Supply

VDD

1.8

3.0

3.6

V

Current consumption(1)

Sleep mode

idd


0.08

0.3

μA

Measuring

300

450

500

μA

Power Dissipation

Sleep mode



0.25

1.1

μW

Average 8bit(2)



2.7


μW

Communication

digital 2-wire interface I2C protocol

Heater

VDD=3V

5.5mW/△T=+0.5-1.5°C

Storage

-40°C /125°C

(1)Conditions: Vdd = 3V, SCK= 400kHz at 25°C
(2)Conditions: Vdd = 3V, SCK= 400kHz, Temp<60°C


HTU21D - Digital Relative Humidity and Temperature Sensor SENSOR PERFORMANCE

RELATIVE HUMIDITY

 (@T= 25°C, @Vdd = 3V)

Characteristics

Symbol

 Min 

 Typ 

 Max 

Unit

Resolution

12 bit



0.04


%RH

8 bit



0.7


%RH

Humidity Operating Range

RH

0


100

%RH

Relative Humidity Accuracy 

@25°C (10%RH to 95%RH)

typ



±2


%RH

max



±3

±5

%RH

Replacement

fully interchangeable

Humidity Hysteresis



±1


%RH

Measuring Time(1)

12 bit



14

18

ms

11 bit



7

9

ms

10 bit



4

5

ms

8 bit



2

3

ms

PSRR




±10

LSB

Recovery time after 150 hours of condensation

t


10


s

Long term drift



0.5


%RH/yr

Response Time (at 63% of signal) from 33 to 75%RH(2)

τRH


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 

HTU21D - Digital Relative Humidity and Temperature Sensor TEMPERATURE

Characteristics

Symbol

 Min 

 Typ 

 Max 

 Unit 

Resolution

14 bit



0.01


°C 

12 bit



0.04


°C 

Temperature Operating Range

T

-40


+125

°C 

Temperature Accuracy @25°C

typ



±0.3


°C 

max



±0.4


°C

Replacement

fully interchangeable

Measuring Time(1)

14bit



44

58

ms

13 bit



22

29

ms

12 bit



11

15

ms

11 bit



6

8

ms

PSRR




±25

LSB

Long term drift



0.04


°C/yr

Response Time (at 63% of signal) from15°C to 45°C (2)


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


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