ZSC31210/ZSSC3122/ZSSC3123

cLite™ SSC Modular Evaluation Kit Description

Evaluation Kit

June 30, 2011

© 2011 Zentrum Mikroelektronik Dresden AG — Rev. 1.1

All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used

without the prior written consent of the copyright owner. The information furnished in this publication is subject to changes

without notice.

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7 Calculation of Calibration Coefficients Off-Line

Note This calculation is possible without connecting the kit boards to the PC. Raw and target values can copied

using the copy and paste function of any spreadsheet program.

Steps for the Off-Line Calibration Coefficient Calculation:

(1) Start the cLite SSC Evaluation Software.

(2) Click on “Calibrate.” The calibration window appears (see Figure 5.1).

(3) Select the coefficients for the desired calibration method by highlighting the coefficients in the upper middle

section of the calibration window. The smaller graph above the coefficient list indicates the recommended

pattern of capacitive sensor readings and temperature readings.

(4) For calibrations using a piece-wise correction, check “Piecewise Correction” and set a break point in the

“Break Pt” field.

(5) Click on “Initialize” in the ASIC ID section (lower left corner). The “Initialize Calibration” window appears (see

Figure 5.2). Click “Browse” and select any xxx.eep file stored in the folder [My Documents]\ZMDI \cLite SSC

Evaluation Software. Click on “Initialize From File.”

Note: This is a “blind” initialization, because no part is connected.

(6) Start data collection. The target and raw values can be written/copied in the related fields. The numbers are

[%] for the capacitance target and raw readings and [

C] for the temperature target and raw readings.

a.

Click on “Add New Point.”

b.

Enter the first target capacitance reading [%] in the “sensor” field and enter the raw value [%] in the

“raw” field. For calibration with temperature compensation, also add the chamber temperature in the

“temp” field temperature and raw readings in the “rawT” fields.

c.

Repeat a) and b) as needed until all calibration points are entered.

Note: See step 12) in section 5.1 for use of the “Cal” column shown in Figure 7.1.

Figure 7.1

Fields for Manually Entering Target and Raw Values

Target and raw values

(e.g., copied from Excel™)

Validation error in calibration point (re-calcu-

lation with calculated coefficients; ignore

errorT without temperature calibration)

Enabled values are

used for calibration

(7) Check the “Valid” check box, and click on the “Calculate Coefficients” button. The coefficients are stored in

the CalibrationLog.txt file.