SHT71 SENSIRION, SHT71 Datasheet

Humidity Sensor

SHT71

Manufacturer Part Number
SHT71
Description
Humidity Sensor
Manufacturer
SENSIRION
Datasheet

Specifications of SHT71

Sensing Accuracy
3%
Sensor Output
Digital
Sensor Terminals
Through Hole
Peak Reflow Compatible (260 C)
Yes
Terminal Type
PCB Surface Mount
Humidity Range
0 To 100% RH
Response Time
8s
Humidity Accuracy ±
3%
Rohs Compliant
Yes
Leaded Process Compatible
Yes
Package / Case
4-SIP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Datasheet SHT7x (SHT71, SHT75)
Humidity and Temperature Sensor
 Fully calibrated
 Digital output
 Low power consumption
 Excellent long term stability
 Pin type package – easy integration
Dimensions
Figure 1: Drawing of SHT7x (applies to SHT71 and SHT75)
sensor packaging, dimensions in mm (1mm = 0.039inch).
Contact assignment: 1: SCK, 2: VDD, 3: GND, 4: DATA.
Hatched item on backside of PCB is a 100nF capacitor – see
Section 2.1 for more information.
www.sensirion.com
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).
0.46
1.2
1 2 3 4
B2G
71
5.08
3.7
1.27
0.2
2.0
3.1
Version 4.3 – May 2010
0.6
2.2
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).
Sensor Chip
SHT7x V4 – for which this datasheet applies – features a
version 4 Silicon sensor chip. Besides a humidity and a
temperature sensor the chip contains an amplifier, A/D
converter, OTP memory and a digital interface. V4 sensors
can be identified by the alpha-numeric traceability code on
the sensor cap – see example “B2G” code on Figure 1.
Material Contents
While the sensor is made of a CMOS chip the sensor
housing consists of an LCP cap with epoxy glob top on an
FR4 substrate. Pins are made of a Cu/Be alloy coated with
Ni and Au. The device is fully RoHS and WEEE compliant,
thus it is free of Pb, Cd, Hg, Cr(6+), PBB and PBDE.
Evaluation Kits
For sensor trial measurements, for qualification of the
sensor or even experimental application (data logging) of
the sensor there is an evaluation kit EK-H4 available
including SHT71 (same sensor chip as SHT1x) and 4
sensor channels, hard and software to interface with a
computer. For other evaluation kits please check
www.sensirion.com/humidity.
1/11

Related parts for SHT71

SHT71 Summary of contents

Page 1

... Figure 1: Drawing of SHT7x (applies to SHT71 and SHT75) sensor packaging, dimensions in mm (1mm = 0.039inch). Contact assignment: 1: SCK, 2: VDD, 3: GND, 4: DATA. Hatched item on backside of PCB is a 100nF capacitor – see Section 2.1 for more information. www.sensirion.com Each SHT7x is individually calibrated in a precision humidity chamber ...

Page 2

... Temperature (°C) Packaging Quantity Tape Stripes 50 Tape Stripes 50 max Units 0.01 °C 14 bit °C °C °C 123.8 °C 254.9 ° °C/yr SHT71 SHT75 60 80 100 Order Number 1-100092-04 1-100071-04 2/11 ...

Page 3

... Out-gassing of glues, adhesive tapes and stickers or out-gassing packaging material such as bubble foils, foams, etc. shall be avoided. Manufacturing area shall be well ventilated. For more detailed information please consult the document “Handling Instructions” or contact Sensirion 100 120 1.4 As stated above extreme conditions or exposure to solvent vapors may offset the sensor ...

Page 4

... Source Voltage 3 GND Ground 4 DATA Serial Data, bidirectional www.sensirion.com Table 1: SHT7x pin assignment. 2.1 Power Pins (VDD, GND) The supply voltage of SHT7x must be in the range of 2.4 and 5.5V, recommended supply voltage is 3.3V. Decoupling of VDD and GND by a 100nF capacitor is integrated on the backside of the sensor packaging. ...

Page 5

... Recommended voltage supply for highest accuracy is 3.3V, due to sensor calibration. 11 Minimum value with one measurement of 8 bit resolution without OTP reload per second, typical value with one measurement of 12bit resolution per second. www.sensirion.com F SCK T SCKx ...

Page 6

... While leaving DATA high, toggle SCK nine or more times – see Figure 8. This must be followed by a Transmission Start sequence preceding the next command. This sequence resets the interface only. The status register preserves its content. www.sensirion.com Code SCK 1 0000x ...

Page 7

... Heater chip heating element can be addressed by writing a command into status register. The heater may increase the temperature of the sensor by 5 – 10°C beyond ambient temperature. The heater draws roughly 8mA @ 5V supply voltage. 12 Corresponds to 9 – 18°F www.sensirion.com Address = ‘000’ Command = ‘00101’ ...

Page 8

... The values given in Table 6 are optimized coefficients for V4 sensors. The parameter set for V3 sensors, which has been proposed in earlier datasheets, still applies and is provided by Sensirion upon request. Values higher than 99%RH indicate fully saturated air and must be processed 13 and displayed as 100%RH ...

Page 9

... RoHS: Within Lot No. specifications Within specifications Qualified Figure 14: First label on reel Sensor Type (71 for SHT71 Chip Version (04 for V4 last digit of year, RRR = number of sensors on reel divided by 10 (200 for 2000 units), Qualified TTTTT = Traceability Code. Device Type: Description: Part Order No. ...

Page 10

... Figure 16: Tape configuration and unit orientation within tape, dimensions in mm (1mm = 0.039inch). Leader tape is to the right of the figure, trailer tape to the left. www.sensirion.com Ø1.5 MIN B2G 71 R0.75 TYP R0.5 TYP Version 4.3 – May 2010 10/11 ...

Page 11

... WARRANTIES, INCLUDING WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE EXPRESSLY EXCLUDED AND DECLINED. SENSIRION is only liable for defects of this product arising under the conditions of operation provided for in the data sheet and proper use of the goods. SENSIRION explicitly disclaims all warranties, express or implied, for any period during which the goods are operated or stored not in accordance with the technical specifications ...

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