ZSC31010 Datasheet

© 2016 Integrated Device Technology, Inc.

33

January 20, 2016

3.6.2.7.

SOT Interpretation

SOT is a 2

non-linearity correction, or Tcg non-linearity correction.

As it applies to bridge non-linearity correction:

Resolution: 0.25% @ Full Scale

2

(Saturation in internal arithmetic will occur at greater negative non-linearities.)

Limitation: Using any calibration method for which SOT is applied to the bridge measurement (SOT_BR), there

is a possibility of calibration math overflow. This only occurs if the sensor input exceeds 200% of the calibrated full

span, which means the highest applied sensor input should never go higher than this value.

Example: This example of the limitation when SOT is applied to the bridge reading uses a pressure sensor bridge

that outputs -10 mV at the lowest pressure of interest. That point is calibrated to read 0%. The same sensor

outputs +40 mV at the highest pressure of interest. That point is calibrated to read 100%. This sensor has a

50 mV span over the pressure range of interest. If the sensor were to experience an over-pressure event that took

the sensor output up to 90 mV (200% of span), the internal calculations could overflow. The result would be a

corrected bridge reading that would not be saturated at 100% as expected, but instead read a value lower than

100%. This problem only occurs when SOT is applied to correct the bridge reading.

As SOT applies to Tcg:

Resolution: 0.3 ppm/(

Range:

±38 ppm/(

As it applies to Tco:

Two settings are possible. It is possible to scale the effect of SOT by 8. If Tc_cfg[1] is set, then both, Tco and

SOT’s contribution to Tco, are multiplied by 8.

Resolution at unity scaling:

1.51 nV/V/(

(input referred)

Range:

±0.192

(input referred)

Resolution at 8x scaling:

12.1 nV/V/(

(input referred)

Range:

±1.54

(input referred)

Limitation: If the second order term SOT applies to Tco, the bridge gain Gain_B is limited to values equal or less

than 8 (instead of 64).