SCA103T View Datasheet(PDF) - VTI technologies

Part Name

Description

Manufacturer

SCA103T

THE SCA103T DIFFERENTIAL INCLINOMETER SERIES

VTI technologies 

SCA103T Series

α

=

arcsin⎜⎜⎝⎛

VDout − Offset

Sensitivity

⎟⎟⎠⎞

where Offset is the output of the device at 0° inclination position, Sensitivity is the sensitivity of the

device and VDout is the output of differential amplifier.

In the case of differential amplifier connection shown in the chapter Recommended circuit diagram

the nominal offset output is 0 V and the sensitivity is 16 V/g with SCA103T-D04 and 8 V/g with

SCA103T-D05.

Angles close to 0° inclination can be estimated quite accurately with straight line conversion but for

best possible accuracy arcsine conversion is recommended to be used. Following table shows the

angle measurement error if straight line conversion is used.

Straight line conversion equation:

α = VDout − Offset

Sensitivity

Where: Sensitivity = 280mV/° with SCA103T-D04 or Sensitivity= 140mV/° with SCA103T-D05

Tilt angle [°]

0

1

2

3

4

5

10

15

30

Straight line conversion error [°]

0

0.0027

0.0058

0.0094

0.0140

0.0198

0.0787

0.2185

1.668

2.3 Ratiometric Output

Ratiometric output means that the zero offset point and sensitivity of the sensor are proportional to

the supply voltage. If the SCA103T supply voltage is fluctuating, the SCA103T output will also vary.

When the same reference voltage for both the SCA103T sensor and the measuring part (A/D-

converter) is used, the error caused by reference voltage variation is automatically compensated.

2.4 SPI Serial Interface

A Serial Peripheral Interface (SPI) system consists of one master device and one or more slave

devices. The master is defined as a microcontroller providing the SPI clock and the slave as any

integrated circuit receiving the SPI clock from the master. The ASIC in VTI Technologies’ products

always operates as a slave device in master-slave operation mode.

The SPI has a 4-wire synchronous serial interface. Data communication is enabled with a low

active Slave Select or Chip Select wire (CSB). Data is transmitted by a 3-wire interface consisting

of wires for serial data input (MOSI), serial data output (MISO) and serial clock (SCK).

VTI Technologies Oy

www.vti.fi

Subject to changes

Doc.Nr. 8261700

10/19

Rev.A

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