Datasheet SHT1x
Use the following formula to convert digital readout (SO
T
)
to temperature value, with coefficients given in Table 8:
enough dwell time for the measurement shall be granted.
For detailed information please consult Application Note
“Qualification Guide”.
The SHT1x 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 10
16
.
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.
Please contact Sensirion for detailed information.
Environment
HTSL
Results
17
Within
specifications
TC
-50°C - 125°C, 1000 cycles Within
Acc. JESD22-A104-C
specifications
UHST
130°C / 85%RH /
≈2.3bar,
Within
96h
specifications
THU
85°C / 85%RH, 1000h
Within
specifications
ESD immunity MIL STD 883E, method 3015 Qualified
(Human Body Model at ±2kV)
Latch-up
force current of ±100mA with Qualified
T
amb
= 80°C, acc. JEDEC 17
Table 10:
Qualification tests: HTSL = High Temperature Storage
Lifetime, TC = Temperature Cycles, UHST = Unbiased Highly
accelerated Stress Test, THB = Temperature Humidity Unbiased
Standard
125°C, 1000 hours
T
�½
d
1
d
2
SO
T
VDD
5V
4V
3.5V
3V
2.5V
d
1
(°C)
-40.1
-39.8
-39.7
-39.6
-39.4
d
1
(°F)
-40.2
-39.6
-39.5
-39.3
-38.9
SO
T
14bit
12bit
d
2
(°C)
0.01
0.04
d
2
(°F)
0.018
0.072
Table 8:
Temperature conversion coefficients
15
.
4.4 Dew Point
SHT1x is not measuring dew point directly, however dew
point can be derived from humidity and temperature
readings. Since humidity and temperature are both
measured on the same monolithic chip, the SHT1x allows
superb dew point measurements.
For dew point (T
d
) calculations there are various formulas
to be applied, most of them quite complicated. For the
temperature range of -40 – 50°C the following
approximation provides good accuracy with parameters
given in Table 9:
RH
m
T
ln
100%
T
n
T
T
d
RH, T
�½
T
n
RH
m
T
m
ln
100%
T
n
T
Temperature Range
Above water, 0 – 50°C
Above ice,
-40 – 0°C
Tn (°C)
243.12
272.62
m
17.62
22.46
6 Packaging
6.1 Packaging type
SHT1x are supplied in a surface mountable LCC
(Leadless Chip Carrier) type package. The sensor housing
consists of a Liquid Crystal Polymer (LCP) cap with epoxy
glob top on a standard 0.8mm FR4 substrate. The device
is fully RoHS and WEEE compliant – it is free of Pb, Cd,
Hg, Cr(6+), PBB and PBDE.
Device size is 7.47 x 4.93 x 2.5 mm (0.29 x 0.19 x 0.1
inch), see Figure 1, weight is 100 mg.
6.2 Traceability Information
All SHT1x are marked with an alphanumeric, three digit
code on the chip cap (for reference: V3 sensors were
labeled with numeric codes) – see “A5Z” on Figure 1. The
lot numbers allow full traceability through production,
16
Table 9:
Parameters for dew point (T
d
) calculation.
Please note that “ln(…)” denotes the natural logarithm. For
RH and T the linearized and compensated values for
relative humidity and temperature shall be applied.
For more information on dew point calculation see
Application Note “Introduction to Humidity”.
5 Environmental Stability
If sensors are qualified for assemblies or devices, 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
15
Temperature coefficients have slightly been adjusted compared to datasheet
SHTxx version 3.01. Coefficients apply to V3 as well as V4 sensors.
Sensor operation temperature range is -40 to 105°C according to AEC-Q100
temperature grade 2.
17
According to accuracy and long term drift specification given on Page 2.
www.sensirion.com
Version 4.3 – May 2010
9/11
SENSITRON [ SENSITRON ]
