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SI7013-A10-GM1R

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Si7013
Rev. 0.95 19
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 Value
Material ePTFE
Water Entry Pressure 2.7 bar
Pore Size 0.35 µ
Operating Temperature –40 to 125 °C
Maximum Reflow Temperature 260 °C
Oleophobicity (AATCC 118-1992) 7
IP Rating (per IEC 529) IP67
Si7013
20 Rev. 0.95
4.6. Bake/Hydrate Procedure
After exposure to extremes of temperature and/or humidity for prolonged periods, the polymer sensor film can
become either very dry or very wet; in each case the result is either high or low relative humidity readings. Under
normal operating conditions, the induced error will diminish over time. From a very dry condition, such as after
shipment and soldering, the error will diminish over a few days at typical controlled ambient conditions, e.g., 48
hours of 45 ≤ %RH ≤ 55. However, from a very wet condition, recovery may take significantly longer. To accelerate
recovery from a wet condition, a bake and hydrate cycle can be implemented. This operation consists of the
following steps:
Baking the sensor at 125 °C for ≥ 12 hours
Hydration at 30 °C in 75% RH for ≥ 10 hours
Following this cycle, the sensor will return to normal operation in typical ambient conditions after a few days.
4.7. Long Term Drift/Aging
Over long periods of time, the sensor readings may drift due to aging of the device. Standard accelerated life
testing of the Si7013 has resulted in the specifications for long-term drift shown in Table 4 and Table 5. This
contribution to the overall sensor accuracy accounts only for the long-term aging of the device in an otherwise
benign operating environment and does not include the effects of damage, contamination, or exposure to extreme
environmental conditions.
Si7013
Rev. 0.95 21
5. I
2
C Interface
The Si7013 communicates with the host controller over a digital I
2
C interface. The 7-bit base slave address is 0x40
or 0x41; the least significant bit is pin programmable.
Master I
2
C devices communicate with the Si7013 using a command structure. The commands are listed in the I
2
C
command table. Commands other than those documented below are undefined and should not be sent to the
device.
Table 13. I
2
C Slave Address Byte
A6 A5 A4 A3 A2 A1 A0 R/W
100000AD01/0
Table 14. I
2
C Command Table
Command Description Command Code
Measure Relative Humidity, Hold Master Mode 0xE5
Measure Relative Humidity, No Hold Master Mode 0xF5
Measure Temperature, Hold Master Mode 0xE3
Measure Temperature, No Hold Master Mode 0xF3
Measure Analog Voltage or Thermistor Temperature, Hold Master Mode 0xEE
Read Temperature Value from Previous RH Measurement 0xE0
Reset 0xFE
Write Voltage Measurement Setup (User register 2) 0x50
Read Voltage Measurement Setup (User register 2) 0x10
Write RH/T Measurement Setup (User register 1) 0xE6
Read RH/T Measurement Setup (User register 1) 0xE7
Write Heater Setup (User register 3) 0x51
Read Heater Setup (User register 3) 0x11
Write Thermistor Correction Coefficient 0xC5
Read Thermistor Correction Coefficient 0x84
Read Electronic ID 1st Word 0xFA 0x0F
Read Electronic ID 2nd Word 0xFC 0xC9
Read Firmware Revision 0x84 0xB8
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SI7013-A10-GM1R

Mfr. #:
Buy SI7013-A10-GM1R
Manufacturer:
Silicon Labs
Description:
SENSOR HUMI/TEMP 3.6V I2C 2% DFN
Lifecycle:
New from this manufacturer.
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