IC-NQC_11 Datasheet, PDF (14/29 Pages) IC-Haus GmbH – 13-bit Sin/D CONVERTER WITH SIGNAL CALIBRATION

iC-NQC
preliminary
13-bit Sin/D CONVERTER WITH SIGNAL CALIBRATION
Rev D1, Page 14/29
Incremental output to A, B and Z
Settings for the maximum possible converter fre-
quency using register FCTR are governed by two cri-
teria:
also make a suitable zero-delay digital glitch filter that
acts on ESD impact on the sensor and keeps the out-
put signals spike free through temporal separation, for
example.
1. The maximum input frequency
2. System restrictions caused by slow counters or data
transmission via cable
Serial data output is possible at any time in BiSS or
SSI protocol. However, for the transfer of angle data to
the output register the incremental output is halted for
one period of the clock signal at pin MA.
In this case it is sensible to preselect a minimum tran-
sition distance for the output signals. These settings
1. Max. Possible Converter Frequency Defined By The Maximum Input Frequency
Output Frequency Resolution Maximum Input Frequency Restrictions
FCTR
fout @ finmax
A, B
Requirem.
bin dec finmax
at high input frequency
0x0004 325 kHz
X X fosc()min / 40 / Resolution
None
0x4102 542 kHz
X X fosc()min / 24 / Resolution
Relative angle error 2x increased
0x4202 1.08 MHz
X X 2 x fosc()min / 24 / Res.
Relative angle error 4x increased
0x4302 2.17 MHz
X X 4 x fosc()min / 24 / Res.
Relative angle error 8x increased
Notes *) Calculated with fosc()min taken from Electrical Characteristics, item A01.
Table 15: Maximum possible converter frequency for incremental A/B/Z output,
defined by the maximum input frequency
Examples*
finmax [kHz] at resol.
8192 1024 200
0.16 1.27 6.5
0.26 2.1 10.8
0.53 4.2 21.6
1.06 8.5 43.3
2. Max. Possible Converter Frequency Defined By The Minimum Transition Distance
Output Frequency Resolution Minimum Transition Distance Restrictions
Example*
FCTR
0x00FF
fout @ t_MTD
A, B
11 kHz
Requirem.
bin dec
XX
at A, B
t_MTD
2048 / fosc()max
at high input frequency
None
t_MTD [µsec]
22.8
0x00FE 11.03 kHz
X X 2040 / fosc()max
None
22.7
0x00FD 11.07 kHz
X X 2032 / fosc()max
None
22.6
...
...
... ... ...
...
...
0x0006 402 kHz
X X 56 / fosc()max
None
0.62
0x0005 536 kHz
X X 48 / fosc()max
None
0.53
0x0004 562 kHz
X X 40 / fosc()max
None
0.44
0x4102 938 kHz
X X 24 / fosc()max
Relative angle error 2x increased 0.27
0x4202 1.87 MHz
X X 12 / fosc()max
Relative angle error 4x increased 0.13
0x4302 3.75 MHz
X X 6 / fosc()max
Relative angle error 8x increased 0.07
Notes *) Calculated with fosc()max taken from El.Char., item A01; transition distance output A vs. output B with same direction
of rotation.
Table 16: Maximum possible converter frequency for incremental A/B/Z output,
defined by the minimum transition distance