SHT21P SENSIRION, SHT21P Datasheet

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SHT21P

Manufacturer Part Number
SHT21P
Description
SENSOR, HUMIDITY & TEMP
Manufacturer
SENSIRION
Datasheet

Specifications of SHT21P

Humidity Range
0 - 100% RH
Sensor Output
Analogue - PWM Interface
Sensor Terminals
SMD
Response Time
8s
Supply Voltage Range
2.1V To 3.6V
Accuracy
2% RH
Supply Voltage
3VDC
Termination
RoHS Compliant
Capacitance
0µF
Rohs Compliant
Yes
Sensing Accuracy
2%
Operating Temperature Range
-40°C To +125°C
Msl
MSL 2 - 1 Year
Datasheet SHT21P
Humidity and Temperature Sensor
 Fully calibrated
 Analog output, PWM interface
 Low power consumption
 Excellent long term stability
 DFN type package – reflow solderable
Dimensions
Figure 1: Drawing of SHT21P sensor package, dimensions
are given in mm (1mm = 0.039inch), tolerances are ±0.1mm.
NC and die pad (center pad) are internally connected to VSS.
They may be left floating. Numbering of E/O pads starts at lower
right corner (indicated by notch in die pad) and goes clockwise
(compare Table 2).
www.sensirion.com
Product Summary
SHT21P, the new humidity and temperature sensor of
Sensirion 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
1.1mm height it provides calibrated, linearized signals in
analog Pulse Width Modulated (PWM) format.
With a completely new designed CMOSens® chip, a
reworked capacitive type humidity sensor and an
improved band gap temperature sensor the performance
level has been lifted even beyond the outstanding
reliability level of the previous sensor generation (SHT1x
and SHT7x). For example, measures have been taken to
stabilize the behavior at high humidity levels.
1.0
0.4
3.0
2.4
2.2
0.8 typ
1.0
0.3 typ
0.3
Bottom View
NC
NC
1.1
VDD
VSS
Version 1.1 – May 2010
SCL
SDA
Sensor Chip
SHT21P features a generation 4C CMOSens® chip.
Besides the capacitive relative humidity sensor and the
band gap temperature sensor, the chip contains an
amplifier, A/D converter, OTP memory and a digital
processing unit.
Material Contents
While the sensor itself is made of Silicon the sensors’
housing consists of a plated Cu lead-frame and green
epoxy-based mold compound. The device is free of Pb, Cd
and Hg – hence it is fully RoHS and WEEE compliant.
Additional Information
Additional information such as Application Notes is
available from the web page www.sensirion.com/sht21.
For more information please contact Sensirion via
info@sensirion.com.
PWM signal runs on a base frequency of 120Hz, the data
signal is provided on SDA line. Pulling SCL high or low
allows for switching between humidity and temperature,
respectively. The sensor measures twice per second. The
PWM signal may be converted to an analog ratiometric
interface by adding a low pass filter.
Every sensor is individually calibrated and tested. Lot
identification is printed on the sensor.
With made improvements and the miniaturization of the
sensor the performance-to-price ratio has been improved.
SHT21 is also available with digital I
2
C or SDM interface.
1/9

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SHT21P Summary of contents

Page 1

... Figure 1: Drawing of SHT21P sensor package, dimensions are given in mm (1mm = 0.039inch), tolerances are ±0.1mm. NC and die pad (center pad) are internally connected to VSS. They may be left floating. Numbering of E/O pads starts at lower right corner (indicated by notch in die pad) and goes clockwise (compare Table 2) ...

Page 2

... Relative Humidity (%RH) Figure 3 Maximal temperature accuracy tolerance Packaging Information Sensor Type typ max Units 3.0 3.6 V SHT21P 180 µA 0.54 mW 120 132 Hz -0.12 Hz/° This datasheet is subject to change and may be amended without prior notice. 4 Value may be higher in environments with vaporized solvents, out-gassing tapes, adhesives, packaging materials, etc ...

Page 3

... Datasheet SHT21P Users Guide SHT21P 1 Extended Specifications For details on how Sensirion is specifying and testing accuracy performance please consult Application Note “Statement on Sensor Specification”. 1.1 Operating Range The sensor works stable within recommended Normal Range – see Figure 4. Long term exposure to conditions outside Normal Range, especially at humidity > ...

Page 4

... Datasheet SHT21P For solder paste printing a laser-cut, stainless steel stencil with electro-polished trapezoidal walls and with 0.125mm stencil thickness is recommended. For the I/O pads the stencil apertures should be 0.1mm longer than PCB pads and positioned with 0.1mm offset away from the centre of the package. The die pad aperture should cover about 70 – ...

Page 5

... Table 2 SHT21P pin assignment (top view) 3.1 Power Pins (VDD, VSS) The supply voltage of SHT21P must be in the range of 2.1 – 3.6V, recommended supply voltage is 3.0V. Power supply pins Supply Voltage (VDD) and Ground (VSS) must be decoupled with a 100nF capacitor, that shall be placed as close to the sensor as possible – ...

Page 6

... Datasheet SHT21P Parameter min VDD to VSS -0.3 Digital IO Pins (SDA, SCL) -0.3 to VSS Input Current on any Pin -100 Table 3 Electrical absolute maximum ratings ESD immunity is qualified according to JEDEC JESD22- A114E method (Human Body Model at 4kV), JEDEC JESD22-A115A method (Machine Model 200V) and ESDA ESD-STM5 ...

Page 7

... Datasheet SHT21P 7 Environmental Stability The SHT2x sensor series were tested according to AEC- Q100 Rev. G qualification test method. Sensor specifications are tested to prevail under the AEC-Q100 temperature grade 2 test conditions listed in Table 9 Sensor performance under other test conditions cannot be guaranteed and is not part of the sensor specifications. ...

Page 8

... Shipping Package SHT2x are provided in tape & reel shipment packaging, sealed into antistatic ESD bags. For SHT21P standard packaging sizes are 400, 1500 and 5000 units per reel. Each reel contains 440mm (55 pockets) header tape and 200mm (25 pockets) trailer tape. ...

Page 9

... Datasheet SHT21P Revision History Date Version 19 Aug 2009 0.6 29 Jan 2010 1.0 5 May 2010 1.1 Important Notices Warning, Personal Injury Do not use this product as safety or emergency stop devices or in any other application where failure of the product could result in personal injury. Do not use this product for applications other than its intended and authorized use ...

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