SCA3000-D01 VTI Technologies, SCA3000-D01 Datasheet - Page 5

• Manufacturer Part Number: SCA3000-D01
• Description: ACCELEROMETER 3-AXIS +/-2G SPI
• Manufacturer: VTI Technologies
• Series: SCA3000r

Specifications of SCA3000-D01

• Axis: X, Y, Z
• Acceleration Range: ±2g
• Sensitivity: 1333 counts/g
• Voltage - Supply: 2.35 V ~ 3.6 V
• Output Type: Digital
• Interface: I²C
• Mounting Type: Surface Mount
• Package / Case: 18-SMD
• For Use With: 551-1041 - SCA3000-D01 DEMOKIT551-1034 - BOARD PWB W/SCA3000-D01
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Bandwidth: -
• Other names: 551-1033-2; SCA3000-D01-10

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1.1
1.2
1.2.1
1.2.2
VTI Technologies Oy
www.vti.fi
General Description
Introduction
Functional Description
Sensing element
Interface IC
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.
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.
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.
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
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.
Oscillator
clock
&
C/V
Reference
Doc.Nr. 8257300A.07
calibration
Analog
ADC
&
Memory
Volatile
Non-
MUX
DE-
1:3
Temperature
sensor
Low-pass
Low-pass
Low-pass
Filter
Filter
Filter
detector
Motion
Decimation
Decimation
Decimation
detector
Free fall
Coordinate
Calibration
Mapping
and
Buffer
2
Ring
C interface. In normal
SPI
I2C
i/f
&
SCK/SCL
MISO/SDA
MOSI
CSB
Control
INT
SCA3000 Series
&
INT
Rev.A.07
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