SI7005-B-GM1 datasheet, PDF - EEWORLD Datasheet

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SI7005-B-GM1: Description湿度温度传感器 0 ~ 100% 相对湿度 I²C ±3% RH 8 s 表面贴装型; CategoryThe sensor Humidity sensor; File Size1MB，39 Pages; ManufacturerSilicon Labs; Websitehttps://www.silabs.com

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SI7005-B-GM1 Overview

湿度温度传感器 0 ~ 100% 相对湿度 I²C ±3% RH 8 s 表面贴装型

SI7005-B-GM1 Parametric

Parameter Name	Attribute value
category
Maker	Silicon Labs
series	-
Package	bring
\u96F6\u4EF6\u72B6\u6001	\u5728\u552E
sensor type	humidity, temperature
Humidity range	0 ~ 100% relative humidity
Output type	I²C
output	12b
Accuracy	±3% RH
Sensitivity	-
Voltage - Power supply	2.1V ~ 3.6V
Installation type	surface mount type
Operating temperature	-40°C ~ 85°C
Package/casing	24-LFQFN Exposed Pad
Supplier device packaging	24-QFN（4x4）
Response time	8 s
Basic product number	SI7005

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Si7005

IGITA L

C H

UMIDITY

Features



AND

EMPERATURE

ENSOR

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

µA during RH conversion

during reflow



Excludes liquids and

particulates

(hydrophobic/oleophobic)



Protection

Ordering Information

See Ordering Guide.

Patent protected; patents pending

Pin Assignments

GND

18 DNC

17 DNC

16 DNC

15 CS

14 DNC

13 DNC

GND

DNC

EXT

DNC

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

SDA

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.

DNC

Rev. 1.5 8/16

Si7005

Si7005

ABLE

Section

ONTENTS

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. I2C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.2. I2C 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

Rev. 1.5

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