SCA3000-D01
Data Sheet
SCA3000-D01 3-AXIS LOW POWER ACCELEROMETER
WITH DIGITAL SPI INTERFACE
Features
• 2.35 V – 3.6 V supply voltage,
1.7 V – 3.6 V digital I/O voltage
• ±2 g measurement range
• SPI digital interface
• Selectable frequency response
• Very low current consumption
(2.5 V, 480 µA typ)
• Temperature output
• 64 samples/axis buffer memory for output
acceleration data and advanced features
enable significant power and resource savings
at system level
• Interrupt signal triggered by motion and free
fall
• Size 7x7x1.8 mm
• Proven capacitive 3D-MEMS technology
• High shock durability
• RoHS compliant / lead free soldering
C/V
Oscillator
&
clock
Reference
Analog
calibration
&
ADC
DEMUX
1:3
NonVolatile
Memory
Applications
SCA3000-D01 is targeted to battery operated
devices. Typical applications are but not limited
• Motion activated functions in mobile
terminals and antitheft systems
• Inertial navigation
• Inclination sensing in digital inclinometers
• Tilt compensation in electronic compass
Low-pass
Filter
Decimation
Low-pass
Filter
Decimation
Low-pass
Filter
Decimation
Temperature
sensor
Motion
detector
SCK
Coordinate
Mapping
and
Calibration
SPI
i/f
MISO
MOSI
CSB
Free fall
detector
Ring
Buffer
Control
&
INT
INT
Figure 1 SCA3000-D01 Block Diagram
VTI Technologies Oy
www.vti.fi
PRELIMINARY - Subject to changes
Doc.nr. 8255700A.01
1/4
Rev.A.01
SCA3000-D01
Performance Characteristics 1)
Parameter
Analog and digital Vdd
Digital I/O Vdd
Operating temperature **
Current consumption *
Acceleration range * 4)
Offset calibration error *
Offset temperature error ** 5)
Sensitivity * 6)
Sensitivity calibration error *
Sensitivity temperature error
** 7)
Non-Linearity ** 8)
Cross-Axis sensitivity ** 9)
Bandwidth ** 10)
Noise ** 11)
Output data rate **
Temperature output
Turn on time ** 12)
Output load **
SPI clock rate **
*
**
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
Condition
Vdd ≥ Digital I/O Vdd
Reset 3)
Active
Motion Detection
mode
Nominal
Z-axis +1g position
-40 ... +85 °C
-40 ... +85 °C
Measurement mode
Bypass measurement
mode
Measurement mode
Bypass measurement
mode
T=+23 °C
Sensitivity
Measurement mode
Bypass measurement
mode
Typical supply range
2.35 – 2.7 V
Min Typ 2)
Max
Extended supply
range 2.7 – 3.6 V
Min Typ 2)
Max
2.35
1.7
-40
-
2.5
1.8 / 2.5
<7
480
300
2.7
2.7
85
-40
-
3.3
3.3
<9
650
400
85
-
V
V
°C
µA
µA
µA
-2
-20
-1
-
±0.5
1333
±0.01
2
20
-
±2
± 50
±0.5
1333
±1
±0.01
-
g
mg
mg/°C
Count/g
%
%/°C
36
56
±1
±3
45
70
-
±1
±3
45
70
-
% FS
%
Hz
Hz
-
3
5
-
3
5
-
mg RMS
mg RMS
200
300
-
250
256
1.8
35
35
-
260
256
1.8
35
35
-
Hz
Count
Count/°C
ms
ms
-
-
35
1.6
-
-
35
1.6
pF
MHz
+1
54
84
100% tested in production
Qualified during product validation
The product is factory calibrated at 2.5 V in room temperature.
Typical values are not guaranteed.
Includes the current through the internal 400 kΩ pull-up resistor connected to digital I/O Vdd.
Range defined as x2+ y 2+ z 2 ≤ 2 g . The measuring range is tested on sensing element level. FS = 2g.
Offset temperature error = {Count(0g)-Offset} / Sensitivity [ g ]. Sensitivity = Calibrated sensitivity.
Offset= Calibrated offset.
Sensitivity = {Count(+1g) - Count(-1g)}/2 [Count/g].
Sensitivity temperature error = {[Count(+1g)-Count(-1g)]/2 - Sensitivity} / Sensitivity x 100% [%].
Sensitivity = Calibrated sensitivity.
From straight line through sensitivity calibration (+1g, -1g) points.
The cross-axis sensitivity determines how much acceleration, perpendicular to the measuring axis,
couples to the output. The total cross-axis sensitivity is the geometric sum of the sensitivities of
the two axes which are perpendicular to the measuring axis. The angular alignment error
between X, Y and Z axis is included into the cross axis sensitivity.
Frequency responses according to Figure 3 and Figure 4.
Average noise/axis over the measurement bandwidth defined as 1 (n 2 + n 2 + n 2 ) , where nx, ny and nz are
3
12)
Units
x
y
z
the measured signal's standard deviation due to noise in x, y and z directions.
Settling error less than 1% of FS.
VTI Technologies Oy
www.vti.fi
PRELIMINARY- Subject to changes
Doc. Nr. 8255700A.01
2/4
Rev.A.01
SCA3000-D01
Z
X
Y
Figure 2 Sensing directions and package dimensions in mm with ±50 µm tolerance.
Figure 3 Frequency response of SCA3000-D01 in
measurement mode
VTI Technologies Oy
www.vti.fi
Figure 4 Frequency response of SCA3000-D01 in
bypass measurement mode
PRELIMINARY- Subject to changes
Doc. Nr. 8255700A.01
3/4
Rev.A.01
SCA3000-D01
Figure 5 Application schematic
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Name
NC
XRESET
INT
CLK
DVSS
DVDD
DVIO
CSB
NC
NC
SCK_SCL
MISO_SDA
MOSI
AVDD
AVSS
AVSS
ATSTIO
NC
Function
Not connected
External reset, active low
Interrupt output
Digital ground
Digital ground
Digital supply
Digital I/O supply
Chip select
Not connected
Not connected
SPI serial clock (SCK)
SPI data out (MISO)
SPI data in (MOSI)
Analog supply
Analog ground
Analog ground
Not connected
Not connected
Table 1 Pin descriptions
Document Change Control
Rev.
A
A.01
Date
21-Apr-06
13-Jun-06
VTI Technologies Oy
www.vti.fi
Change Description
1st official release
Dimensions updated
PRELIMINARY- Subject to changes
Doc. Nr. 8255700A.01
4/4
Rev.A.01