E+E Elektronik HCT01 Developer'S Manual Download | Manualshive

Page: 11 / 11

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Rev. 0.2 / 09 /2015

12

AN1111-2

5 Contact information

E+E Elektronik Ges.m.b.H.

Langwiesen 7

A-4209 Engerwitzdorf

Austria

Tel.:

+43 7235 605 0

Fax.:

+43 7235 605 8

E-Mail:

info@epluse.com

Homepage:

www.epluse.com

Please visit our website to find your local contact.

6 Revision history

Date

Revision number

Changes

November 2011

V_0.1

Initial release

September 2015

V_0.2

Revised version

Copyright© 2014, E+E Elektronik.

Subject to technical changes and misprints

All rights reserved

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Summary of Contents for HCT01

Page 1: ...Rev 0 2 09 2015 2 AN1111 2 Developer s Guide for HCT01 Humidity and Temperature Sensors...

Page 2: ...2 1 Schematic circuit diagram 6 2 1 1 Bill of Material 6 2 1 2 Correlation between sensor capacity and period 7 3 RH measurement with pre adjusted HCT01 and microcontroller based initially accurate c...

Page 3: ...gives an overview on the accuracy which can be achieved by various combinations of HCT01 circuitry Using an unadjusted RH sensor HCT01 00 implies humidity calibration for the device built with it The...

Page 4: ...Rev 0 2 09 2015 5 AN1111 2 Choice of HCT01 version and driving circuitry Figure 1 Circuitry options for HCT01...

Page 5: ...ive humidity at the sensor The accurate measurement of the period requires a precise time base such as a quartz crystal 2 1 Schematic circuit diagram Figure 2 Circuitry with frequency output 2 1 1 Bil...

Page 6: ...n 95 pF 25 4 s cycle duration Figure 3 The sensitivity is approx 0 064 s rH with a rise of 0 25 pF rH Figure 4 Nominal characteristic of the measuring device with frequency output Figure 5 Example of...

Page 7: ...ailable in the E E patent EP 1 574 847 B1 US 7 084 644 B2 3 1 Schematic circuit diagram Figure 6 Schematic circuit design 1 There are three possible measurement paths 1 Sensor capacitance path with R1...

Page 8: ...parator reaches the voltage at the voltage divider no repeat point 2 and recharge the reference yes end of loop and save the numbers of charge discharge events 6 Each cycle measures the reference path...

Page 9: ...B influences and hysteresis is shown in Figure 8 Figure 8 Initial accurate electronics w o C_Cal PCB corrected 0 10 20 30 40 50 60 70 80 90 100 0 10 20 30 40 50 60 70 80 90 100 digital capacitance val...

Page 10: ...l test and layout optimizing loops These imply tests for assessing the impact of the stay capacitance and its variations on the output signal of the device as follows 1 Test a sample of relevant size...

Page 11: ...0 Fax 43 7235 605 8 E Mail info epluse com Homepage www epluse com Please visit our website to find your local contact 6 Revision history Date Revision number Changes November 2011 V_0 1 Initial relea...

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