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ZSSC3027 Datasheet(PDF) 39 Page - Renesas Technology Corp

Part # ZSSC3027
Description  Low-Power, High-Resolution 16-Bit Sensor Signal Conditioner
PDF  47 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

ZSSC3027 Datasheet(HTML) 39 Page - Renesas Technology Corp

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ZSSC3027 Datasheet
© 2016 Integrated Device Technology, Inc.
39
April 20, 2016
3.8.
The Calibration Math
3.8.1.
Bridge Signal Compensation
The saturation check in the ZSSC3027 is enhanced compared with older SSCs from IDT. Even saturation effects
of the internal calculation steps are detected, allowing the final correction output to still be determined. It is
possible to get potentially useful signal conditioning results even if there has been 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 equations:
SETL
T
Raw
T
T
−
=
∆
_
(1)
+
∆
⋅
⋅
∆
+
=
Tcg
T
tcg
SOT
T
K
15
15
15
1
2
_
2
2
(2)
+
∆
⋅
⋅
∆
+
+
=
Tco
T
tco
SOT
T
Raw
BR
B
Offset
K
15
15
2
2
_
2
_
_
(3)
15
2
15
1
15
2
2
2
_
+
⋅
⋅
=
K
K
B
Gain
Z
BP
(delimited to positive number range)
(4)
+
⋅
⋅
=
15
15
15
2
2
_
2
BP
BP
Z
bridge
SOT
Z
B
(delimited to positive number range)
(5)
Where
B
=
Corrected bridge reading output via I
2C™ or SPI; range [0
HEX to FFFFHEX]
BR_Raw
=
Raw bridge reading from ADC after AZ correction; range [-1FFFFHEX to 1FFFFHEX]
Gain_B
=
Bridge gain term; range [-1FFFFHEX to 1FFFFHEX]
Offset_B
=
Bridge offset term; range [-1FFFFHEX to 1FFFFHEX]
Tcg
=
Temperature coefficient gain term; range [-1FFFFHEX to 1FFFFHEX]
Tco
=
Temperature coefficient offset term; range [-1FFFFHEX to 1FFFFHEX]
T_Raw
=
Raw temperature reading after AZ correction; range [-1FFFFHEX to 1FFFFHEX]
TSETL
=
T_Raw reading at which low calibration was performed (e.g., 25°C);
range [-FFFFHEX to FFFFHEX]



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