ZSSC3123AI2R datasheet(49/62 Pages) RENESAS

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ZSSC3123 Datasheet

Nov 19, 2021

Page 49

13. Calibration and Signal Conditioning Math

Renesas can provide software and hardware with samples to perform the calibration. For a complete description and detailed examples, see

ZSSC3122/ZSSC3123_SSC_Modular_Evaluation_Kit_Description_RevX_xy.pdf.

Note: For best results, the calibration should be done with all settings set to the final application including supply voltage, measurement mode,

update rate, output mode, resolution, and AFE settings in the final packaging.

13.1 Capacitance Signal Conditioning

The ZSSC3123 supports signal conditioning for an up to two-region piece-wise, non-linear sensor input or a third-order correction, which is

selectable. The general form of the capacitance signal conditioning equations are provided below.

Note: The following equations are only meant to show the general form and capabilities of the ZSSC3123 sensor signal conditioning.

Two-region piece-wise, non-linear sensor input:

Raw _C OFFSET

T (Tco

T SOT _ tco)

RawTC

T (Tcg

T SOT _ tcg )



  



  

Equation 17

Raw

MIN(RawTC,Raw _ Break )



Equation 18

Raw

MAX( ,RawTC Raw _ Break )



Equation 19

(

)

(

)

Out SOT _

Gain _

Raw

Gain _

Raw

SOT _

Gain _

Raw

Gain _

Raw

















Equation 20

Or alternatively

Non-linear sensor input up to third-order correction:

Raw _C OFFSET

T (Tco

T SOT _ tco)

Raw

T (Tcg

T SOT _ tcg )



  



  

Equation 21

1 (

)

1 (

)

Out TOT _

Gain _

Raw

SOT _

Gain _

Raw

Gain _

Raw













Equation 22

Where:

Symbol

Description

Raw_C

Raw sensor reading.

RawTC

Temperature-corrected raw value.

Raw1

Raw value to be used for region 1 correction.

Raw2

Raw value used for region 2 correction.

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