SCA8X0/21X0/3100 Series

VTI Technologies Oy

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www.vti.fi

Doc. Nr. 82 694 00 C

1.3

Typical applications

VTI Automotive Digital Accelerometer Platform is targeted to automotive applications with high

stability requirements. Typical applications include but are not limited to

•

Electronic Stability Control (ESC)

•

Hill Start Assist (HSA)

•

Electronic Parking Brake (EPB)

•

Roll Over

•

Active Suspension

•

Inclination

•

Industrial applications

1.4

Functional Description

Basic product concept of the VTI Automotive Digital Accelerometer Platform is a two chip solution

consisting of a single sensing element and one ASIC inside a pre-molded 12-pin housing. The

interface to the application is a four wire digital SPI interface. In single axis products there is also

Pulse Width Modulation output available. In addition to the supply voltage filtering the component

does not require any other components to be connected to the device.

Block diagram of SCA8X0/SCA21X0/31X0

1.4.1

Sensing element

The sensing element of the product is manufactured by using VTI Technologies proprietary bulk

3D-mems process enabling a robust, stable and low noise capacitive sensor. Depending on the

product type and measurement direction the sensing element type and orientation inside the

housing can vary. Single axis products are equipped with single axis sensing elements and multi

axis products are equipped with multi axis sensing elements.

1.4.2

Interface IC

The main functional blocks of the interface ASIC are the following:

1.4.3

Capacitance to voltage conversion

The acceleration is causing a capacitance change inside the sensing element. The capacitance

change can be detected by the ASIC analog interface. The capacitance information is converted

into an analog voltage that can be further processed easily inside the ASIC.