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SHT20P Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers

Part No. SHT20P
Description  DFN type package reflow solderable
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Maker  ETC2 [List of Unclassifed Manufacturers]
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SHT20P Datasheet(HTML) 5 Page - List of Unclassifed Manufacturers

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Datasheet SHT20P
www.sensirion.com
Version 4 – May 2014
5/10
Figure 8 Top view of example of mounted SHT2x with slits
milled into PCB to minimize heat transfer.
2.4
Light
The SHT2x is not light sensitive. Prolonged direct
exposure to sunshine or strong UV radiation may age the
sensor.
2.5
Materials Used for Sealing / Mounting
Many materials absorb humidity and will act as a buffer
increasing response times and hysteresis. Materials in the
vicinity of the sensor must therefore be carefully chosen.
Recommended materials are: Any metals, LCP, POM
(Delrin), PTFE (Teflon), PEEK, PP, PB, PPS, PSU, PVDF,
PVF.
For sealing and gluing (use sparingly): Use high filled
epoxy for electronic packaging (e.g. glob top, underfill),
and Silicone. Out-gassing of these materials may also
contaminate the sensor (see Section 2.2). Therefore try to
add the sensor as a last manufacturing step to the
assembly, store the assembly well ventilated after
manufacturing or bake at >50°C for 24h to outgas
contaminants before packing.
Interface Specifications
Pin Name
Comment
1
SDA Data bit-stream
2
VSS Ground
5
VDD Supply Voltage
6
SCL Selector for RH or T
3,4
NC Not connected
Table 2 SHT20P pin assignment (top view)
2.6
Power Pins (VDD, VSS)
The supply voltage of SHT20P 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 – see Figure 9.
2.7
SCL – Output Selector Pad
SCL is used to select humidity or temperature output. SCL
high yields humidity output, SCL low yields temperature
output. Please note that a change of SCL will affect the
output on SDA after maximal 1.2 seconds.
Figure 9 Typical application circuit, including decoupling of
VDD and VSS by a capacitor.
2.8
SDA – Bit Stream Pad
On SDA the sensor is providing PWM output. The signal is
carrying humidity or temperature data depending on SCL
being high or low, respectively. See Table 4 for detailed
I/O characteristic of the sensor.
3 Electrical Characteristics
3.1
Absolute Maximum Ratings
The electrical characteristics of SHT20P are defined in
Table 1. The absolute maximum ratings as given in Table
3 are stress ratings only and give additional information.
Functional operation of the device at these conditions is
not implied. Exposure to absolute maximum rating
conditions for extended periods may affect the sensor
reliability (e.g. hot carrier degradation, oxide breakdown).
SDA
SCL
VSS
VDD
SHT2x
PWM bit stream
Select RH or T
1
6
5
2
4
3


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