SI7005USB-DONGLE datasheet, PDF

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SI7005USB-DONGLE: DescriptionDIGITAL I2C HUMIDITY AND TEMPERATURE SENSOR; Categoryunclassified; File Size323KB，41 Pages; ManufacturerSILABS; Websitehttp://www.silabs.com

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DIGITAL I2C HUMIDITY AND TEMPERATURE SENSOR

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Si7005

IGITA L

C H

UMIDITY AND

EMPERATURE

ENSOR

Features



Relative Humidity Sensor





4.5 % RH (maximum @ 0–80% RH)

Temperature Sensor



±0.5

ºC accuracy (typical)





±1 ºC accuracy (maximum @ 0 to 70 °C)



0 to 100% RH operating range



–40 to +85 °C (GM) or 0 to +70 °C

operating range (FM)



Wide operating voltage range

(2.1 to 3.6 V)



Low Power Consumption



240

C host interface

Integrated on-chip heater

4x4 mm QFN package

Excellent long term stability

Factory calibrated

Optional factory-installed

cover



Low-profile



Protection

µA during RH conversion

during reflow



Excludes liquids and

particulates

(hydrophobic/oleophobic)

Ordering Information

See Ordering Guide.

Patent protected; patents pending

Applications



Industrial HVAC/R



Thermostats/humidistats



Respiratory therapy



White goods



Micro-environments/data centers



Automotive climate control and

de-fogging



Asset and goods tracking

GND

DNC

SCL

Pin Assignments

GND

18 DNC

17 DNC

16 DNC

15 CS

14 DNC

13 DNC

GND

DNC

EXT

DNC

GND

Description

The Si7005 is a digital relative humidity and temperature sensor. This

monolithic CMOS IC integrates temperature and humidity sensor

elements, an analog-to-digital converter, signal processing, calibration

data, and an I

C host interface. The patented use of industry-standard,

low-K polymeric dielectrics for sensing humidity enables the construction

of a low-power, monolithic CMOS sensor IC with low drift and hysteresis

and excellent long term stability.

Both the temperature and humidity sensors are factory-calibrated and the

calibration data is stored in the on-chip non-volatile memory. This ensures

that the sensors are fully interchangeable, with no recalibration or

software changes required.

The Si7005 is packaged in a 4x4 mm QFN package and is reflow

solderable. The optional factory-installed protective cover offers a low-

profile, convenient means of protecting the sensor during assembly (e.g.,

reflow soldering) and throughout the life of the product, excluding liquids

(hydrophobic/oleophobic) and particulates.

The Si7005 offers an accurate, low-power, factory-calibrated digital

solution ideal for measuring temperature, humidity, and dew-point in

applications ranging from HVAC/R and asset tracking to industrial and

consumer platforms.

SDA

DNC

Rev. 1.2 1/14

Si7005

Si7005

ABLE O F

ONTENTS

Section

Page

1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

2. Typical Application Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.2. Relative Humidity Sensor Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.3. Linearization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.4. Temperature Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.5. Hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.6. Prolonged Exposure to High Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.7. PCB Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.8. Protecting the Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.9. Bake/Hydrate Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.10. Long Term Drift/Aging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5. Host Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.1. I

C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.2. I

C Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

6. Si7005 Connection Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

7. Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

7.1. Register Detail (Defaults in Bold) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

8. Pin Descriptions: Si7005 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

9. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

10. Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

10.1. 24-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

10.2. 24-Pin QFN with Protective Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

11. PCB Land Pattern and Solder Mask Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

12. Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

12.1. Si7005 Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

12.2. Top Marking Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

13. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

Rev. 1.2

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