IC-TW28 Datasheet, PDF (63/80 Pages) IC-Haus GmbH – 10-BIT SIN/COS INTERPOLATOR

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Rev D2, Page 63/80
EXCESSIVE ADAPTION DETECTION
In serial configuration mode, the iC-TW28 can be config-
ured to detect when one or more of the error correction
parameters changes too much due to auto-adaption
during operation. This excessive adaption condition is
indicated by the adapt bits (bit 6) in the STAT_VAL and
STAT_LATCH registers.
To configure excessive adaption detection, values for
the four base registers and three limit registers must be
entered and stored in the EEPROM.
copy these values to the corresponding base registers.
Then enter values for the three limit (LIM) registers
representing the maximum error correction parameter
deviation that should be allowed.
In operation, STAT_VAL.adapt and STAT_LATCH.adapt
are set whenever the absolute value of the difference
between one of the correction values and its corre-
sponding base value exceeds the corresponding limit.
Specifically, whenever
Correction Register
S_OFS_COR
C_OFS_COR
SC_BAL_COR
SC_PH_COR
STAT_VAL.adapt
Base Register
S_OFS_BASE
C_OFS_BASE
SC_BAL_BASE
SC_PH_BASE
Limit Register
SC_OFS_LIM
SC_BAL_LIM
SC_PH_LIM
|S_OFS_COR − S_OFS_BASE| > SC_OFS_LIM
|C_OFS_COR − C_OFS_BASE| > SC_OFS_LIM
|SC_BAL_COR − SC_BAL_BASE| > SC_BAL_LIM
|SC_PH_COR − SC_PH_BASE| > SC_PH_LIM
Table 123: Adaption Limit Exceeded
After auto calibration has been used to set the nominal
error correction values in the correction (COR) regis-
ters, use the write COR to BASE command (0x12) to
Configure the desired action to take when this condi-
tion occurs using the adapt bit (bit 6) in the STAT_SEL,
STAT_IE, and STAT_HIZ registers. Store all these val-
ues to the internal EEPROM using the write configura-
tion to EEPROM command (0x11).