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SI7013-A10-IMR

I2C HUMIDITY AND TWO-ZONE TEMPERATURE SENSOR

Silicon Laboratories 

Si7013-A10

4.5. Protecting the Sensor

Because the sensor operates on the principal of measuring a change in capacitance, any changes to the dielectric

constant of the polymer film will be detected as a change in relative humidity. Therefore, it is important to minimize

the probability of contaminants coming into contact with the sensor. Dust and other particles as well as liquids can

affect the RH reading. It is recommended that a cover is employed in the end system that blocks contaminants but

allows water vapor to pass through. Depending on the needs of the application, this can be as simple as plastic or

metallic gauze for basic protection against particulates or something more sophisticated such as a hydrophobic

membrane providing up to IP67 compliant protection.

The Si7013 may be ordered with a factory-fitted, solder-resistant cover that can be left in place for the lifetime of

the product. It is very low-profile, hydrophobic and oleophobic, and excludes particulates down to 0.35 microns in

size. See Section “8. Ordering Guide” for a list of ordering part numbers that include the cover. A dimensioned

drawing of the IC with the cover is included in Section “9. Package Outline ” . Other characteristics of the cover are

listed in Table 12.

Table 12. Specifications of Protective Cover

Parameter

Material

Water Entry Pressure

Pore Size

Operating Temperature

Maximum Reflow Temperature

Oleophobicity (AATCC 118-1992)

IP Rating (per IEC 529)

Value

ePTFE

2.7 bar

0.35 µ

–40 to 125 °C

260 °C

7

IP67

Rev. 1.0

19

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