SCA8X0/21X0/3100 Series
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.
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