SHT20S datasheet(7/10 Pages) ETC2

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Datasheet SHT20S

www.sensirion.com

Version 4 – May 2014

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6 Conversion of Signal Output

After the low pass filter the sensor provides an output

Voltage VSO which as a portion of VDD then is converted

into a physical value.

Resolution is set to 10 bit for relative humidity and 12 bit

for temperature and cannot be changed. The sensor

reading is linearized and hence it can be converted to a

physical value by an easy linear equation.

6.1

Relative Humidity Conversion

With the relative humidity signal output the relative

humidity RH is obtained by the following formula (result in

%RH):

VDD

125

-6



The physical value RH given above corresponds to the

relative humidity above liquid water according to World

Meteorological Organization (WMO). For relative humidity

above ice RHi the values need to be transformed from

relative humidity above water RHw at a certain temperature

t. The equation is given in the following, compare also

Application Note “Introduction to Humidity”:



































exp

Units are %RH for relative humidity and °C for

temperature. The corresponding coefficients are defined

as follows: βw = 17.62, λw = 243.12°C, βi = 22.46, λi =

272.62°C.

6.2

Temperature Conversion

The temperature T is calculated by inserting temperature

signal output ST into the following formula (result in °C):

VDD

175.72

46.85









7 Environmental Stability

The SHT2x sensor series were tested based on AEC-

Q100 Rev. G qualification test method where applicable.

Sensor specifications are tested to prevail under the AEC-

Q100 temperature grade 1 test conditions listed in Table

513.

Sensor performance under other test conditions cannot be

guaranteed and is not part of the sensor specifications.

Especially, no guarantee can be given for sensor

13 Sensor operation temperature range is -40 to 125°C (AEC-Q100 temperature

grade 1)..

performance in the field or for customer’s specific

application.

Environment Standard

Results14

HTOL

125°C, 408 hours

Pass

-50°C - 125°C, 1000 cycles

Pass

UHST

130°C / 85%RH / ≈2.3bar, 96h

Pass

THB

85°C / 85%RH, 1000h

Pass

HTSL

150°C, 1000h

Pass

ELFR

125°C, 48h

Pass

ESD immunity HBM 4kV, MM 200V, CDM

750V/500V (corner/other pins)

Pass

Latch-up

force current of ±100mA with Tamb

= 125°C

Pass

Table 5: Qualification tests: HTOL = High Temperature

Operating Lifetime, TC = Temperature Cycles, UHST =

Unbiased Highly accelerated Stress Test, THB = Temperature

Humidity Biased, HTSL = High Temperature Storage Lifetime,

ELFR = Early Life Failure Rate. For details on ESD see Sect.

4.1.

If sensors are qualified for reliability and behavior in

extreme conditions, please make sure that they

experience same conditions as the reference sensor. It

should be taken into account that response times in

assemblies may be longer, hence enough dwell time for

the measurement shall be granted. For detailed

information please consult Application Note “Qualification

Guide”.

8 Packaging

8.1 Packaging type

SHT2x sensors are provided in DFN packaging (in

analogy with QFN packaging). DFN stands for Dual Flat

No leads.

The sensor chip is mounted to a lead frame made of Cu

and plated with Ni/Pd/Au. Chip and lead frame are over

molded by green epoxy-based mold compound. Please

note that side walls of sensors are diced and hence lead

frame at diced edge is not covered with respective

protective coating. The total weight of the sensor is 25mg.

8.2

Filter Cap and Sockets

For SHT2x a filter cap SF2 is available. It is designed for

fast response times and compact size. Please find the

datasheet on Sensirion’s web page.

14 According to accuracy and long term drift specification given on Page 2.

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