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AN4038 Datasheet(PDF) 16 Page - STMicroelectronics |
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AN4038 Datasheet(HTML) 16 Page - STMicroelectronics |
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16 / 39 page  STM8TL5xxx sensitivity setting AN4038 16/39 Doc ID 022686 Rev 1 3.4 Electrode parasitic capacitance compensation (EPCC) The EPCC compensates part of the projected capacitance to achieve the target reference value. The target reference is the gain defined by the ratio: Figure 13 shows the EPCC variation versus the target reference. This test was performed using sensor #10 (see Figure 2). Figure 13. EPCC variation versus target reference At a fixed CS capacitance, the higher the selected target reference value is, the higher the CEPPC value is to compensate the CX capacitance. To guarantee optimum system performance, it is recommended to check that the EPCC value, after calibration, is in the range 20 < EPCC < 230. This ensures a sufficient operating margin to adapt the system to environmental or mechanical changes. C S C X C EPPC – () ⁄ |
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