SCA3000-D01 datasheet(5/43 Pages) VTI

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SCA3000 Series

VTI Technologies Oy

5/ 43

www.vti.fi

Doc.Nr. 8257300A.07

Rev.A.07

General Description

1.1

Introduction

SCA3000 is a three axis accelerometer family targeted for products requiring high performance

with low power consumption. It consists of a 3D-MEMS sensing element and a signal conditioning

ASIC packaged into a plastic Molded Interconnection Device package (MID).

A block diagram of the SCA3000 product family is presented in Figure 1 below.

INT

DE-

MUX

1:3

Low-pass

Filter

Low-pass

Filter

Low-pass

Filter

Decimation

Coordinate

Mapping

and

Calibration

Oscillator

clock

Motion

detector

Free fall

detector

Reference

SPI

I2C

i/f

Control

INT

SCK/SCL

MISO/SDA

MOSI

CSB

Ring

Buffer

C/V

Analog

calibration

ADC

Non-

Volatile

Memory

Temperature

sensor

Figure 1. SCA3000 Block Diagram.

This document, no. 8257300, describes the product specification (e.g. operation modes, user

accessible registers, electrical properties and application information) for the SCA3000 family. The

specification for an individual sensor is available in the corresponding data sheet.

1.2

Functional Description

1.2.1

Sensing element

The sensing element is manufactured using the proprietary bulk 3D-MEMS process, which enables

robust, stable and low noise & power capacitive sensors.

The sensing element consists of three acceleration sensitive masses. Acceleration will cause a

capacitance change that will be then converted into a voltage change in the signal conditioning

ASIC. Due to its mechanical construction, the element's measurement coordinates are rotated 45°

compared to the conventional orthogonal X,Y,Z coordinate system.

1.2.2

Interface IC

The sensing element is interfaced via a capacitance-to-voltage (CV) converter. Following

calibration in the analog domain, the signal is converted by a successive approximation type of

analog-to-digital converter (ADC). The ADC's signal is de-multiplexed into three signal processing

channels where it is low-pass filtered and decimated. After that, the signals are mapped into

orthogonal coordinates (X-Y-Z) and transferred to the output registers. Depending on the product,

the SCA3000 sensor supports either a fully digital serial SPI or I

2C interface. In normal

measurement mode, acceleration data can be read via the serial bus. Other supported features are

a separate motion detection mode and parallel free-fall detection. In these modes, the sensor will

generate an interrupt when a pre-defined condition has been met.

The SCA3000 includes an internal oscillator, reference and non-volatile memory that enable the

sensor's autonomous operation within a system. The temperature sensor is used in some product

applications to enhance the temperature stability. In that case, temperature information can also be

read out from the device.

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