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ZSSC3016 Datasheet(PDF) 39 Page - Renesas Technology Corp

Part # ZSSC3016
Description  Low Power, High Resolution 16-Bit Sensor Signal Conditioner
PDF  46 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

ZSSC3016 Datasheet(HTML) 39 Page - Renesas Technology Corp

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ZSSC3016 Datasheet
© 2016 Integrated Device Technology, Inc.
39
January 25, 2016
3.8.
The Calibration Math
3.8.1.
Bridge Signal Compensation
The saturation check in the ZSSC3016 is enhanced compared with older SSCs from IDT. Even saturation effects
of the internal calculation steps are detected, even though the final correction output will still be determined. It is
possible to get seemingly useful signal conditioning results which have seen an intermediate saturation during the
calculations – these cases are detectable by observing the status bit[0] for each measurement result. Details
about the saturation limits and the valid ranges for values are provided in the following equations.
SOT_curve selects whether second-order equations compensate for sensor nonlinearity with a parabolic or
S-shaped curve. The parabolic compensation is recommended.
The correction formula for the differential signal reading is represented as a two-step process depending on the
SOT_curve setting.
Equations for the parabolic SOT_curve setting (SOT_curve = 0):
Simplified:
SETL
T
Raw
T
T
−
=
∆
_
(5)
+
∆
⋅
⋅
∆
+
=
Tcg
T
tcg
SOT
T
K
15
15
15
1
2
_
2
2
(6)
+
∆
⋅
⋅
∆
+
+
=
Tco
T
tco
SOT
T
Raw
BR
B
Offset
K
15
15
2
2
_
2
_
_
(7)
15
2
15
1
15
2
2
2
_
+
⋅
⋅
=
K
K
B
Gain
Z
BP
(delimited to positive number range)
(8)
+
⋅
⋅
=
15
15
15
2
2
_
2
BP
BP
Z
bridge
SOT
Z
B
(delimited to positive number range)
(9)
Complete:
[
] 1
2
2
17
17
_
−
−
−
=
∆
SETL
T
Raw
T
T
(10)
1
2
2
1
2
2
1
2
2
1
2
2
15
15
15
1
17
17
17
17
17
17
17
17
2
_
2
2
−
−
−
−
−
−
−
−
+


∆
⋅
⋅
∆
+
=
Tcg
T
tcg
SOT
T
K
(11)
1
2
2
1
2
2
1
2
2
1
2
2
1
2
2
15
15
2
17
17
17
17
17
17
17
17
17
17
2
_
2
_
_
−
−
−
−
−
−
−
−
−
−
+


∆
⋅
⋅
∆
+
+
=
Tco
T
tco
SOT
T
Raw
BR
B
Offset
K
(12)



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