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WM8352 Datasheet(PDF) 176 Page - Wolfson Microelectronics plc |
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WM8352 Datasheet(HTML) 176 Page - Wolfson Microelectronics plc |
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176 / 336 page  WM8352 Production Data w PD, February 2011, Rev 4.4 176 19.5 CALIBRATION The on-chip reference VREF provides a highly accurate reference voltage to the AUXADC. For best measurement accuracy, the WM8352 provides a way to determine the voltage offset of the AUXADC’s VREF buffer and the gain error introduced by scaling the AUXADC input. Measured data can then be adjusted accordingly, eliminating these errors. To determine the buffer’s offset, the AUXADC AUX3 input is disconnected from the AUX3 pin and connected to the unbuffered VREF voltage. Note that input scaling must be used, (i.e. AUXADC_SCALE3 = 10 or 11), in order to ensure that the AUXADC input is within the measurable range. Measuring this voltage using the buffered VREF as the reference (AUXADC_REF3 = 1) makes it possible to calculate the combined error. ADDRESS BIT LABEL DEFAULT DESCRIPTION R145 (91h) Digitizer Control (2) 2 AUXADC_CAL 0 Configure AUX3 input to be the VREF supply for AUXADC calibration. 0 = AUX3 input connected to AUX3 pin 1 = AUX3 input connected to unbuffered VREF Table 118 AUXADC Calibration |
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