IC-TW28 Datasheet, PDF (47/80 Pages) IC-Haus GmbH – 10-BIT SIN/COS INTERPOLATOR

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Rev D2, Page 47/80
STAT_VAL
STAT_VAL is a dynamic register containing bits that
indicate the status of the signal path. These bits are
active for the duration of the specified condition.
STAT_VAL (0x0404)
Bit
Name
Description
0
oflow
Signal path overflow
1
falarm Input frequency alarm
2
laglim
Excessive position lag
3
inclim
Output frequency limited
4
lagfatl
Fatal position lag
5
scamp Input amplitude out of range
6
adapt
Adaption limit exceeded
7
res
Correction residue threshold exceeded
STAT_VAL.adapt indicates that one or more of the cor-
rection parameters has deviated from its base value by
more than its specified limit.
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
Table 85: Adaption Limit Exceeded
STAT_VAL.res indicates that one or more of the correc-
tion residue values has exceeded its residue threshold.
Table 83: Status Register
STAT_VAL.oflow indicates that the signal path is sat-
urated somewhere, most likely due to ADC overflow.
This condition is not fatal, but does result in reduced
interpolation accuracy.
Residue Register
S_OFS_RES
C_OFS_RES
SC_BAL_RES
SC_PH_RES
Z_PH_RES
STAT_VAL.res
Residue Threshold Register
SC_OFS_TH
SC_BAL_TH
SC_PH_TH
Z_PH_TH
STAT_VAL.falarm indicates that the sin/cos input fre-
quency is above the limit set in the FALARM register.
STAT_VAL.laglim indicates that the AB outputs are lag-
ging behind the input by more than 45^◦ of a sin/cos
input cycle. In this condition, the filter is disabled, but
the AB outputs are still valid. This condition can be
avoided by reducing input acceleration or by reducing
the FILT_K.kp value.
STAT_VAL.inclim indicates that either the AB output
frequency is being limited to the AB output frequency
limit set in the ABLIMIT register, or the UVW output fre-
quency is greater than 8.33 MHz. This condition is not
fatal and the AB/UVW outputs are still valid, although
if it persists, it will eventually cause a fatal lag limit
(STAT_VAL.lagfatl) condition.
Table 86: Correction Residue Threshold Exceeded
STAT_LATCH
The STAT_LATCH register contains the same status
bits as the STAT_VAL register, except that the bits are
latched and stay active until cleared.
STAT_LATCH (0x0405)
Bit
Name
Description
0
oflow
Signal path overflow
1
falarm Input frequency alarm
2
laglim
Excessive position lag
3
inclim
Output frequency limited
4
lagfatl
Fatal position lag
5
scamp Input amplitude out of range
6
adapt
Adaption limit exceeded
7
res
Correction residue threshold exceeded
Table 87: Latched Status Register
STAT_VAL.lagfatl indicates a fatal lag condition and the
AB and UVW outputs are not valid. This occurs if a
STAT_VAL.inclim condition persists for too long.
Latched status bits are cleared by writing 0 to the bit.
Writing 1 to a bit does nothing, allowing bits to be
cleared individually.
STAT_VAL.scamp indica_√tes that the sin/cos signal am-
plitude as calculated by sin² + cos² is outside the lim-
its specified by the amplitude limit registers.
Sin/Cos Amplitude
Register
SC_AMP
STAT_VAL.scamp
Amplitude Low Limit
Register
SC_AMP_LOW
Amplitude High Limit
Regester
SC_AMP_HIGH
Table 84: Input Amplitude Out of Range