sca100t VTI Hamlin, sca100t Datasheet - Page 14

• Manufacturer Part Number: sca100t
• Description: The Sca100t Dual Axis Inclinometer Series
• Manufacturer: VTI Hamlin

2.7 Temperature Measurement
VTI Technologies Oy
www.vti.fi
Vout
Figure 12.
V1 = initial output voltage before the self test function is activated.
V2 = output voltage during the self test function.
V3 = output voltage after the self test function has been de-activated and after stabilization time
Please note that the error band specified for V3 is to guarantee that the output is within 5% of the
initial value after the specified stabilization time. After a longer time (max. 1 second) V1=V3.
T1 = Pulse length for Self test activation
T2 = Saturation delay
T3 = Recovery time
T4 = Stabilization time =T2+T3
T5 = Rise time during self test.
Self test characteristics:
The SCA100T has an internal temperature sensor, which is used for internal offset compensation.
The temperature information is also available for additional external compensation. The
temperature sensor can be accessed via the SPI interface and the temperature reading is an 8-bit
word (0…255). The transfer function is expressed with the following formula:
Where:
The temperature measurement output is not calibrated. The internal temperature compensation
routine uses relative results where absolute accuracy is not needed. If the temperature
measurement results are used for additional external compensation then one point calibration in
the system level is needed to remove the offset. With external one point calibration the accuracy of
the temperature measurement is about ±1 °C.
0 V
0 V
5 V
T1 [ms]
20-100
5V
Counts
T
T
=
Counts
Typ. 25
T2 [ms]
ST pin
voltage
Self test wave forms
−
Temperature reading
Temperature in °C
. 1
V1
083
−
197
T3 [ms]
Typ. 30
T5
V2
T1
T4 [ms]
Typ. 55
Subject to changes
Doc. nr. 8261800
T2
T5 [ms]
Typ. 15
T4
T3
V2:
Min 0.95*VDD
(4.75V @Vdd=5V)
V3
V3:
0.95*V1-1.05*V1
SCA100T Series
Rev.A
14/18