SCA3000 Series
1
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.
SCK/SCL
Low-pass
Filter
Decimation
Decimation
Decimation
Coordinate
Mapping
and
Analog
calibration
&
MISO/SDA
C/V
DE-
MUX
1:3
SPI
&
I2C
i/f
Calibration
Low-pass
Filter
ADC
MOSI
CSB
Low-pass
Filter
INT
Oscillator
&
Reference
Non-
Volatile
Temperature
sensor
Motion
detector
Free fall
detector
Ring
Buffer
Control
&
clock
Memory
INT
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 I2C 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.
VTI Technologies Oy
www.vti.fi
5/ 43
Rev.A.07
Doc.Nr. 8257300A.07
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