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Digital Temperature and Humidity Sensor - SHT71

Size: 19.5 x 5.08 x 3.1 mm
Output: digital (2-wire Interface)
Supply voltage range: 2.4 to 5.5 V
Energy consumption: 80μW (at 12bit, 3V, 1 measurement / s)
RH operating range: 0 - 100% relative humidity
T operating range: -40 to +125°C (-40 to +257°F)
RH response time: 8 sec (tau63%)

Model Number: SHT71
Data Sheet:

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Product Specification

SHT71 Digital Temperature and Humidity Sensor Product Summary
SHT7x (including SHT71 and SHT75) is Sensirion’s family of relative humidity and temperature sensors with pins. The sensors integrate sensor elements plus signal processing in compact format and provide a fully calibrated digital output. A unique capacitive sensor element is used for measuring relative humidity while temperature is measured by a band-gap sensor. The applied CMOSens? technology guarantees excellent reliability and long term stability. Both sensors are seamlessly coupled to a 14bit analog to digital converter and a serial interface circuit. This results in superior signal quality, a fast response time and insensitivity to external disturbances (EMC).

Each SHT7x is individually calibrated in a precision humidity chamber. The calibration coefficients are programmed into an OTP memory on the chip. These coefficients are used to internally calibrate the signals
from the sensors. The 2-wire serial interface and internal voltage regulation allows for easy and fast system integration. The small size and low power consumption makes SHT7x the ultimate choice for even the most demanding applications.

SHT7x is supplied on FR4 with pins which allows for easy integration or replacement. The same sensor is also available as surface mountable packaging (SHT1x) or on flex print (SHTA1).

SHT71 Digital Temperature and Humidity Sensor FEATURES
? Fully calibrated
? Digital output
? Low power consumption
? Excellent long term stability
? Pin type package – easy integration

SHT71 Digital Temperature and Humidity Sensor PERFORMANCE
Relative Humidity

Parameter	Condition	min	typ	max	Units
Resolution		0.4	0.05	0.05	%RH
Resolution		8	12	12	bit
Accuracy	typical		±3.0		%RH
Accuracy	maximal	see Figure 2
Repeatability			±0.1		%RH
Hysteresis			±1		%RH
Non-linearity	raw data		±3		%RH
Non-linearity	linearized		<<1		%RH
Response time	tau 63%		8		s
Operating Range		0		100	%RH
Long term drift	normal		< 0.5		%RH/yr

Temperature

Parameter	Condition	min	typ	max	Units
Resolution		0.04	0.01	0.01	°C
Resolution		12	14	14	bit
Accuracy	typical		±0.4		°C
Accuracy	maximal	see Figure 3
Repeatability			±0.1		°C
Operating Range		-40		123.8	°C
Operating Range		-40		254.9	°F
Response Time	tau 63%	5		30	s
Long term drift			< 0.04		°C/yr

Electrical and General Items

Parameter	Condition	min	typ	max	Units
Source Voltage		2.4	3.3	5.5	V
Power Consumption	sleep		2	5	μW
	measuring		3		mW
	average		90		μW
Communication	digital 2-wire interface, see Communication
Storage	10 - 50°C (0 - 80°C peak), 20 - 60%RH

Other Series:

Series	Typ. Humidity Accuracy %RH	Typ. Temperature Accuracy °C	Supply Voltage Range V	Interface	Package Size (L x W x H) mm
SHT30	±2	±0.2	2.4 to 5.5	I2C, analog voltage	2.5 x 2.5 x 0.9
SHT31	±2	±0.2	2.4 to 5.5	I2C, analog voltage	2.5 x 2.5 x 0.9
SHT35	±1.5	±0.1	2.4 to 5.5	I2C	2.5 x 2.5 x 0.9
SHTW1	±3	±0.4	1.62 to 1.98	I2C	1.3 x 0.7 x 0.5
SHTW2	±3	±0.4	1.62 to 1.98	I2C	1.3 x 0.7 x 0.5
SHTC1	±3	±0.3	1.62 to 1.98	I2C	2 x 2 x 0.8
SHT20	±3	±0.3	2.1 to 3.6	I2C, PWM, SDM	3 x 3 x 1.1
SHT21	±2	±0.3	2.1 to 3.6	I2C, PWM, SDM	3 x 3 x 1.1
SHT25	±1.8	±0.2	2.1 to 3.6	I2C	3 x 3 x 1.1
SHT10*	±4.5	±0.5	2.4 to 5.5	Digital Sbus	7.5 x 4.9 x 2.6
SHT11*	±3	±0.4	2.4 to 5.5	Digital Sbus	7.5 x 4.9 x 2.6
SHT15*	±2	±0.3	2.4 to 5.5	Digital Sbus	7.5 x 4.9 x 2.6
SHT71	±3	±0.4	2.4 to 5.5	Digital Sbus	19.5 x 5.08 x 3.1
SHT75	±1.8	±0.3	2.4 to 5.5	Digital Sbus	19.5 x 5.08 x 3.1
*Not recommended for new design (NRND); newer products available