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US 2014/0190237 A1Published application
Output specification calibrating apparatus for capacitive pressure sensor
AssigneeAuto Industrial Co., Ltd.
InventorsKyong M. Park, Kang-Yoon LEE
Life of this patent
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Abstract
An output specification calibrating apparatus for a capacitive pressure sensor. The output specification calibrating apparatus enables adjustment of non-linearity, offset, and gain of the capacitive pressure sensor in a software manner at the time of shipment. Accordingly, it is feasible to easily adjust output specifications of the capacitive pressure sensor and to thereby meet various needs of customers.
Claims10
An output specification calibrating apparatus for a capacitive pressure sensor, comprising:
- an output control circuit configured to convert capacitance changes of a capacitance Cp formed by a primary electrode of the capacitive pressure sensor and a capacitance Cr formed by a reference electrode of the capacitive pressure sensor into an output voltage and output the output voltage;
- an output specification calibration element configured to comprise at least one output specification offset calibration element, an output specification non-linearity adjustment element, an output specification gain adjustment element, and an output specification temperature compensation element, each element configured to adjust a specification of an output of the output control circuit;
- a setting unit configured to set electrical property values of the output specification offset calibration element, the output specification non-linearity adjustment element and the output specification gain adjustment element;
- an external input interface configured to be connected to an external terminal for setting the electrical property values of the output specification offset calibration element, the output specification non-linearity adjustment element and the output specification gain adjustment element;
- and
- a temperature compensation circuit configured to set electrical property values of the output specification temperature compensation element.
3 more elements
Dependencies are inferred from the claim text.