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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:

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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
Current consumption⁽¹⁾	Measuring	idd	300	450	500	μA
Power Dissipation	Sleep mode			0.25	1.1	μW
Power Dissipation	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
Resolution	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
Relative Humidity Accuracy @25°C (10%RH to 95%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⁾		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

TEMPERATURE

Characteristics		Symbol	Min	Typ	Max	Unit
Resolution	14 bit			0.01		°C
Resolution	12 bit			0.04		°C
Temperature Operating Range		T	-40		+125	°C
Temperature Accuracy @25°C	typ			±0.3		°C
Temperature Accuracy @25°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⁾		Tτ		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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