28018 Parallax Inc, 28018 Datasheet

28018

Manufacturer Part Number

28018

Description

MODULE SENSOR TEMP+HUMIDITY

Manufacturer

Parallax Inc

Series

Sensirion SHT11r

Datasheets

1.28018.pdf (9 pages)

2.28018.pdf (8 pages)

Specifications of 28018

Output Type

Digital - 2-Wire

Sensor Type

Humidity and Temperature

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Lead Free Status / RoHS Status

Lead free / RoHS Compliant, Lead free / RoHS Compliant

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SHT1x / SHT7x

Humidity & Temperature Sensor

_ Relative humidity and temperature sensors

_ Dew point

_ Fully calibrated, digital output

_ Excellent long-term stability

_ No external components required

_ Ultra low power consumption

_ Surface mountable or 4-pin fully interchangeable

_ Small size

_ Automatic power down

SHT1x / SHT7x Product Summary

The SHTxx is a single chip relative humidity and

temperature multi sensor module comprising a calibrated

digital output. Application of industrial CMOS processes with

patented micro-machining (CMOSens® technology) ensures

highest reliability and excellent long term stability. The

device includes a capacitive polymer sensing element for

relative humidity and a bandgap temperature sensor. Both

are seamlessly coupled to a 14bit analog to digital converter

and a serial interface circuit on the same chip. This results in

superior signal quality, a fast response time and insensitivity

to external disturbances (EMC) at a very competitive price.

Each SHTxx is individually calibrated in a precision humidity

chamber with a chilled mirror hygrometer as reference. The

www.sensirion.com

Applications

_ HVAC

_ Automotive

_ Consumer Goods

_ Weather Stations

_ (De-) Humidifiers

Ordering Information

Part

Number

SHT11

SHT15

SHT71

SHT75

Humidity

accuracy

±3.5%RH ±0.5°C

±2.0%RH ±0.4°C

±3.5%RH ±0.5°C

±2.0%RH ±0.4°C

Temperature

accuracy

_ Test & Measurement

_ Data Logging

_ Automation

_ White Goods

_ Medical

Sensirion, Eggbühlstr. 14, 8052 Zürich, Switzerland, Tel: +41 1 306 40 00, Fax: +41 1 306 40 30

@25°C

Package

SMT (LCC)

4-pin single-in-line

Evaluation Kit

Available

calibration coefficients are programmed into the OTP

memory. These coefficients are used internally during

measurements to calibrate the signals from the sensors.

The 2-wire serial interface and internal voltage regulation

allows easy and fast system integration. Its tiny size and low

power consumption makes it the ultimate choice for even

the most demanding applications.

The device is supplied in either a surface-mountable LCC

(Leadless Chip Carrier) or as a pluggable 4-pin single-in-line

type package. Customer specific packaging options may be

available on request.

Block Diagram

%RH

Sensor

Temp.

Sensor

Calibration

Memory

SHT7x

generator

Digital 2-

Interface

CRC

wire

SHT1x

v2.0

GND

VDD

SCK

DATA

Related parts for 28018

28018 Summary of contents

Page 1

SHT1x / SHT7x Humidity & Temperature Sensor _ Relative humidity and temperature sensors _ Dew point _ Fully calibrated, digital output _ Excellent long-term stability _ No external components required _ Ultra low power consumption _ Surface mountable or 4-pin ...

Page 2

SHT1x / SHT7x Relative Humidity & Temperature Sensor System 1 Sensor Performance Specifications Parameter Conditions Min. Typ. Max. Units Humidity Resolution 0.5 0.03 0. (2) Repeatability Accuracy linearized (1) Uncertainty Interchangeability Nonlinearity raw data linearized Range Response time ...

Page 3

SHT1x / SHT7x Relative Humidity & Temperature Sensor System 2.2.3 Sending a command To initiate a transmission, a “Transmission Start” sequence has to be issued. It consists of a lowering of the DATA line while SCK is high, followed by ...

Page 4

SHT1x / SHT7x Relative Humidity & Temperature Sensor System wait for data ready Command Figure 6 Overview of Measurement Sequence (TS =Transmission Start) 2.3 Status Register Some of the advanced functions of the SHTxx are available through ...

Page 5

SHT1x / SHT7x Relative Humidity & Temperature Sensor System 3 Converting Output to Physical Values 3.1 Relative Humidity To compensate for the non-linearity of the humidity sensor and to obtain the full accuracy it is recommended to convert the readout ...

Page 6

SHT1x / SHT7x Relative Humidity & Temperature Sensor System 4 Applications Information 4.1 Operating and Storage Conditions Figure 11 Recommended operating conditions Conditions outside the recommended range may temporarily offset the RH signal up to ±3%RH. After return to normal ...

Page 7

SHT1x / SHT7x Relative Humidity & Temperature Sensor System 5 Package Information 5.1 SHT1x (surface mountable) Pin Name Comment 1 GND Ground 2 DATA Serial data, bidirectional 3 SCK Serial clock, input 4 VDD Supply 2.4 – 5.5V NC Remaining ...

Page 8

SHT1x / SHT7x Relative Humidity & Temperature Sensor System 5.2 SHT7x (4-pin single-in-line) Pin Name Comment 1 SCK Serial clock input 2 VDD Supply 2.4 – 5.5V 3 GND Ground 4 DATA Serial data bidirectional Table 11 SHT7x Pin Description ...

Page 9

SHT1x / SHT7x Relative Humidity & Temperature Sensor System 6 Revision history Date Version February 2002 Preliminary 1-9 June 2002 Preliminary March 2003 Final v2.0 The latest version of this document and all application notes can be found at: www.sensirion.com/en/download/humiditysensor/SHT11.htm ...

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