Verfahren zur Differentialmessung der Spannungspegeln einer kapazitiven Veränderung.

Details

Veröffentlichungs-Nr.

EP2722985

Aktenzeichen

EP12461553

Anmeldetag

16. Oktober 2012

Veröffentlichung

10. Februar 2016

Erteilung

10. Februar 2016

Rechtsraum

EP

IPC

H03K17/00H03K17/96

Abstract

A method of differential measurements of the voltage for capacitive touch sensors comprises steps: a) the sensor line is cleared by connecting to the low state voltage; b) the charge current source (I1) is activated for a specified time (t_charge); c) the level on the port (ADC) is read by control device and the result value ( V charge ) is stored; d) the sensor line is cleared by connecting to the high state voltage; e) the discharge current source (I2) is activated for a specified time (t_discharge); f) the level on the port (ADC) is read by control device and the result value ( V discharge ) is stored; g) the control device calculates the difference between the charge voltage level and discharge voltage level according to the expression: V dif = V discharge - V charge where V dif is an absolute value of the difference between the charge voltage level and discharge voltage level; V charge is a charge voltage level in the form of numerical value or voltage value; and V discharge is a discharge voltage level in the form of numerical value or voltage value.

Anmelder

Firma

Diehl AKO Stiftung & Co. KG

Land

🇩🇪 Deutschland

Fachgebiete