Cirrus Logic AN366 - Manual (Page 36)

AN366
36 AN366REV2
CHECK STATUS OF DRDY
SDI = 0x80
0x17 0xFFFFFF Read INT STATUS DRDY (page 0, register 23)
SDO = 0xFF 0xFF 0x4XXXXX (DRDY not Set)
SDI = 0x80 0x17 0xFFFFFF Read INT STATUS DRDY (page 0, register 23)
SDO = 0xFF 0xFF 0xCXXXXX (DRDY Set)
READ POWER REGISTERS
(See Figure 31.)
SDI = 0x90
0x06 0xFFFFFF Read I1RMS (page 16, register 6)
SDO = 0xFF 0xFF 0x40081D (0.2501238)
SDI = 0x90 0x0C 0xFFFFFF Read I2RMS (page 16, register 12)
SDO = 0xFF 0xFF 0x40086D (0.2501286)
SDI = 0x90 0x07 0xFFFFFF Read V1RMS (page 16, register 7)
SDO = 0xFF 0xFF 0x99ACE6 (0.6002945)
SDI = 0x90 0x0D 0xFFFFFF Read V2RMS (page 16, register 13)
SDO = 0xFF 0xFF 0x99ADA6 (0.600306)
SDI = 0x90 0x05 0xFFFFFF Read P1AVG (page 16, register 5)
SDO = 0xFF 0xFF 0x133936 (0.1501835)
SDI = 0x90 0x0B 0xFFFFFF Read P2AVG (page 16, register 11)
SDO = 0xFF 0xFF 0x133966 (0.1501892)
SDI = 0x90 0x1D 0xFFFFFF Read PSUM (page 16, register 29)
SDO = 0xFF 0xFF 0x266DFD (0.3002316)
SDI = 0x90 0x1E 0xFFFFFF Read QSUM (page 16, register 30)
SDO = 0xFF 0xFF 0x000616 (0.0001857)
SDI = 0x90 0x1F 0xFFFFFF Read SSUM (page 16, register 31)
SDO = 0xFF 0xFF 0x266E40 (0.3002396)
Figure 31. Conversion Window
PROPER CALIBRATION RESULTS?
PC/Controller should test for proper calibration results.
PERFORM NO LOAD COMPENSATION
No Load Offset Compensation Flow Diagram on page 47
READ IRMS,
VRMS, PAVG,
PSUM, QSUM,
SSUM
DRDY
SET ?
VRMS = 0.6 ?
IRMS = SCALE(0.6)?
PAVG = 0.36 ?
CHECK
SETUP or
FAIL
SCALE = 0.25, Therefore
IRMS = 0.25 after calibration
YES
NO
YES
NO
12
YES
NO
11
PERFORM
NO LOAD
COMPENSATION
& READ PAVG