iC-MN 25-BIT NONIUS ENCODER
WITH 3-CH. SAMPLING 13-BIT Sin/D INTERPOLATION
Rev D1, Page 21/59
OPERATING MODES and CALIBRATION PROCEDURES
iC-MN supports a number of different calibration troller signal CGUCKx available at pin T0 are devoid of
strategies, providing both digital and analog test sig- AC contents.
nals to this end. The following tables give the various
modes of operation.
In calibration modes TWIB and TEIB the temper-
ature monitoring and bias reference source IBP can
For the adjustment of the signal conditioning unit be adjusted. Here the temperature threshold is set to
analog test signals are output in analog calibration the required value for either warning or shutdown; the
modes ANA_x, with digital signals activated by digital other value is determined by the fixed difference of the
calibration modes DIG_x, enabling the signal condi- switching thresholds.
tioning to be set across measurements of various duty
cycles. The order of the procedure for both modes of As the VTTx measurement voltages and CGUCKx sig-
calibration is described in the following chapter.
nals are only available via a buffer stage the buffer off-
set voltage must be taken into account if the tempera-
Alternatively, with an active signal level controller iC- ture thresholds are to be adjusted with any accuracy.
MN can be calibrated in controller modes AAC_x, To this end the buffer offset voltage can be measured
where the residual signal ripple is minimized. For this in calibration mode TBOS. A voltage is then applied
purpose the signal gain, offset and phase correction to pin T1, with the buffer offset voltage being the differ-
parameters must be set in such a way that the con- ence between this and pin T0.
Parameter
Output Signals
Op. Mode TRACMODE CALMODE BYP* Pins PSOUT, NSOUT, PCOUT, NCOUT Pin T0 Pin T1 Pin DIR
Normal
0
0
Output of master track via line driver
Table 8: Normal operating mode
0
0
-
Parameter
Output Signals
Op. Mode TRACMODE CALMODE BYP* Pins PSOUT, NSOUT, PCOUT, NCOUT Pin T0
Pin T1
Pin DIR
Signal calibration modes with VDCx intermediate voltages
ANA_M
ANA_S
ANA_N
1
1
2
2
3
3
0
0
0
0
0
0
0
1
0
1
0
1
Calib. signals of master chan.
PSINM, NSINM, PCINM, NCINM
Calib. signals of segment chan.
PSINS, NSINS, PCINS, NCINS
Calib. signals of nonius chan.
PSINN, NSINN, PCINN, NCINN
SVDCM
SVDCM
SVDCS
SVDCS
SVDCN
SVDCN
CVDCM
CVDCM
CVDCS
CVDCS
CVDCN
CVDCN
-
-
-
-
-
-
Signal calibration modes with AC noise evaluation (with active sine-square level controlling)
AAC_M
AAC_S
AAC_N
1
2
3
4
4
4
Calib. signals of master chan.
Calib. signals of segment chan.
Calib. signals of nonius chan.
CGUCKM
CGUCKS
CGUCKN
-
-
-
-
-
Bias calibration, temperature-sensor calibration, and buffer offset measurement
TWIB
TEIB
0
0
0
5
6
7
Output of master track via line driver
Output of master track via line driver
Output of master track via line driver
VTSw
VTSe
VTth
IBP
IBP
-
VTtherr
TBOS
Notes
BUFFOUT BUFFIN
S/D conversion modes with a cyclic conversion, such as 0x08, 0x09, 0x0A, are not permitted during
signal calibration. Cyclic BiSS data requests must also be avoided due to its trigger for sample-and-hold.
Analog calibration signals are output via 5 kΩ source impedance. The maximum permissible signal
frequency is 2 kHz for a load of 200 pF (see Elec. Char. 709, 710)
* Bypass function: inputs (without voltage divider) to outputs, ca. 7 kΩ source impedance
Table 9: Operating modes for analog signal calibration
ICHAUS [ IC-HAUS GMBH ]
