Datasheet

SCA100T Series
VTI Technologies Oy Subject to changes 14/18
www.vti.fi Doc. nr. 8261800 Rev.A
083.1
197
−
−
=
Counts
T
Figure 12. Self test wave forms
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:
T1 [ms] T2 [ms] T3 [ms] T4 [ms] T5 [ms] V2: V3:
20-100 Typ. 25 Typ. 30 Typ. 55 Typ. 15 Min 0.95*VDD
(4.75V @Vdd=5V)
0.95*V1-1.05*V1
2.7 Temperature Measurement
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:
Counts Temperature reading
T Temperature in °C
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.
Vout
5V
0 V
T5
T1
T2
T3
T4
V1
V2 V3
ST pin
voltage
0 V
5 V