Datasheet
17
EEH210
v1.0 / Modification rights reserved
Conversion of Signal Output
After the low pass filter the sensor provides an output Voltage V
SO which as a portion of VDD then is converted into a phys-
ical 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.
With the relative humidity signal output the relative humidity RH is obtained by the following formula (result in %RH):
RH=-6+125∙
V
SO
VDD
The physical value RH given above corresponds to the relative humidity above liquid water according to World
Meteorological Organization (WMO).
The temperature T is calculated by inserting temperature signal output ST into the following formula (result in °C):
T=-46.85+175.72∙
V
SO
VDD
9. aPPlications
9.1. storage instruction
Moisture Sensitivity Level (MSL) is 1, according to IPC/JEDEC J-STD-020. At the same time, it is recommended to further
process the sensors within 1 year after date of delivery.
It is of great importance to understand that a humidity sensor is not a normal electronic component and needs to be han-
dled with care. Chemical vapors at high concentration in combination with long exposure times may offset the sensor
reading.
For this reason it is recommended to store the sensors in original packaging including the sealed ESD bag at following
conditions: Temperature shall be in the range of 10°C – 50°C and humidity at 20 – 60%RH (sensors that are not stored
in ESD bags).
9.2. solDering instructions
For soldering, a lead-free, air-, and nitrogen-reflow-solderable no-clean type 3 solder paste, which meets the requirements
of the RoHS Directive 2002/95/EC Art. 4, as well as the standards by J-STD-004, is recommended. For further guide
regarding soldering and assembling, please refer to Application Note.
Figure 20: Metal Land pattern
3.1 (0.12)
1.7
(0.067)
2.1
(0.08)
0.65
(0.026)
0.35 (0.014)
0.5
(0.02)