Cirrus Logic AN366 - Manual (Page 39)

AN366
AN366REV2 39
COMPUTE CALIBRATED REGISTER CHECKSUM
The register checksum is computed each time a conversion is completed (Single or Con-
tinuous). If no register have changed the user needs only read the checksum register after
prior conversion. But if a register has been updated (Scale for example) then the user must
perform another conversion before the read (see Figure 35).
If register(s) changed since conversion (SCALE changed), then perform single conversion
first, then read checksum:
SDI =
0xD4 Single Conversion Command (Optional)
SDO = 0xFF
SDI =
0x90 0x01 0xFFFFFF Read Checksum (Page 16, Register 1)
SDO = 0xFF 0xFF 0xF40578
Figure 35. Setup Window and Conversion Window
STORE CALIBRATION CONSTANTS & CHECKSUM
Write to MCU Flash all the calibration constants and checksum.
COMPUTE
CALIBRATED
REGISTER
CHECKSUM
CALIBRATION
COMPLETE
STORE
CALIBRATION
CONSTANTS &
CHECKSUM
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