SCA103T Series
2
2.1
Functional Description
Differential Measurement
The measuring axis of SCA103T sensing elements are mutually opposite in direction, thus
providing two inclination signals which can be differentiated externally, either by using a differential
amplifier or a microcontroller.
The differential measurement principle removes all common mode measurement errors. Most of
the error sources have similar effects on both sensing elements. These errors are removed from
measurement result during signal differentiation. The differential measurement principle gives very
efficient noise reduction, improved long term stability and extremely low temperature dependency.
Typical output characteristics (Channels 1, 2 and differential output: OUT1-OUT2) are presented in
the figure below. For differential amplifier connection refer to the recommended circuit diagram.
SCA103T-D04 outputs and differential amplifier output
6.0
5.0
4.0
3.0
2.0
Output [V]
1.0
0.0
-1.0
-2.0
-3.0
-4.0
-5.0
-6.0
-20
D
1
SCA103T OUT_1
SCA103T OUT_2
Differential output
2
-15
-10
-5
0
Tilt angle [ ° ]
5
10
15
20
Figure 7.
Differential output characteristics
2.2
Voltage to Angle Conversion
The analog output behavior of the SCA103T is described in the figure below. The arrow represents
the measuring axis direction marking on the top of SCA103T package.
Earth's gravity
OUT1 <
OUT2 >
DIFF <
Figure 8.
OUT1 =2.5V
OUT2 =2.5V
DIFF =0 V
< OUT1
> OUT2
<DIFF
Behavior of the analog output
The analog output can be transferred to angle by using the following equation for conversion:
VTI Technologies Oy
www.vti.fi
Subject to changes
Doc.Nr. 8261700
9/19
Rev.A
VTI [ VTI TECHNOLOGIES ]
