Cirrus Logic CS5550 - Manual (Page 9)

CDB5550
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2.2.3 Calibration Window
The Calibration Window allows the user to perform Offset and Gain calibrations on both channels. To per-
form an Offset calibration, connect the analog input to the referenced zero point (typically ground) and
click on the calibration (cal) button for that given channel. The resulting calibration value will be displayed
in both hexadecimal and decimal form below the button for that channel. To perform a Gain calibration,
apply a full-scale signal to the analog input and click on the calibration (cal) button for that given channel.
Please note that the input full-scale value will change based on the internal amplifier gain setting and ref-
erence voltage. Refer to the CS5550 datasheet for more information.
Figure 5. CDB5550 Calibration Window
2.2.3.1. View Cal Registers Button
The View Cal Registers button will display the calibration values stored in the CS5550 calibration regis-
ters. If the CS5550 has been previously calibrated and not powered down or reset, then the CS5550 cal-
ibration registers will contain the previous calibration values. The calibration registers must be cleared
prior to performing a calibration. To clear these registers, reset the CS5550 by pressing the board reset
switch, S1, or cycle the power.
2.2.4 Conversion Window
The user can perform conversions and display the results using the Conversion Window, see Figure 6.
The CS5550 provides both filtered and unfiltered conversion results for both channels. The unfiltered and
filtered data displays are updated at the end of each cycle count, which is determined by the cycle count
register. A cycle count of 4000 results in the data being updated once every second. A cycle count of 400