SHT20 datasheet(10/14 Pages) ETC2

10 / 14 page

Datasheet SHT20

www.sensirion.com

Version 4 – May 2014

10/14

5.8

Serial Number

SHT20 provides an electronic identification code. For

instructions on how to read the identification code please

refer to the Application Note “Electronic Identification

Code” – to be downloaded from the web page

www.sensirion.com/SHT20.

6 Conversion of Signal Output

Default resolution is set to 12 bit relative humidity and 14

bit temperature reading. Measured data are transferred in

two byte packages, i.e. in frames of 8 bit length where the

most significant bit (MSB) is transferred first (left aligned).

Each byte is followed by an acknowledge bit. The two

status bits, the last bits of LSB, must be set to ‘0’ before

calculating physical values. In the example of Figure 15

and Figure 16, the transferred 16 bit relative humidity data

is ‘0110’0011’0101’0000’ = 25424.

6.1

Relative Humidity Conversion

With the relative humidity signal output SRH the relative

humidity RH is obtained by the following formula (result in

%RH), no matter which resolution is chosen:

125









In the example given in Figure 15 and Figure 16 the

relative humidity results to be 42.5%RH.

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 temperature t. The

equation is given in the following, compare also

Application Note “Introduction to Humidity”:



































ex p

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), no

matter which resolution is chosen:

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

914.

Environment Standard

Results15

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 9: Performed qualification test series. HTOL = High

Temperature Operating Lifetime, TC = Temperature Cycles,

UHST = Unbiased Highly accelerated Stress Test, THB =

Temperature Humidity Biased. For details on ESD see Sect. 4.1.

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

performance in the field or for customer’s specific

application.

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 “Testing

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.

14 Temperature range is -40 to 125°C (AEC-Q100 temperature grade 1).

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

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