iC-NQC
13-bit Sin/D CONVERTER WITH SIGNAL CALIBRATION
Rev B1, Page 14/29
Incremental output to A, B and Z
also make a suitable zero-delay digital glitch filter that
Settings for the maximum possible converter fre- acts on ESD impact on the sensor and keeps the out-
quency using register FCTR are governed by two cri- put signals spike free through temporal separation, for
teria:
example.
1. The maximum input frequency
Serial data output is possible at any time in BiSS or
2. System restrictions caused by slow counters or data SSI protocol. However, for the transfer of angle data to
transmission via cable
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
Examples*
fout @ finmax
A, B
Requirem.
at high input frequency
finmax [kHz] at resol.
8192 1024 200
FCTR
bin dec finmax
0x0004
0x4102
0x4202
0x4302
Notes
325 kHz
542 kHz
1.08 MHz
2.17 MHz
X
X
X
X
X
X
X
X
f(OCS)min / 40 / Resolution
f(OSC)min / 24 / Resolution
2 x f(OSC)min / 24 / Res.
4 x f(OSC)min / 24 / Res.
None
0.16
0.26
0.53
1.06
1.27
2.1
4.2
8.5
6.5
Relative angle error 2x increased
Relative angle error 4x increased
Relative angle error 8x increased
10.8
21.6
43.3
*) Calculated with fosc()min taken from Electrical Characteristics, item A01.
Table 16: Maximum possible converter frequency for incremental A/B/Z output,
defined by the maximum input frequency
2. Max. Possible Converter Frequency Defined By The Minimum Transition Distance
Output Frequency Resolution Minimum Transition Distance Restrictions
Example*
fout @ tMTD
Requirem. at A, B
at high input frequency
tMTD [µsec]
FCTR
A, B
bin dec tMTD
0x00FF 11 kHz
X
X
X
...
X
X
X
X
X
X
X
X
X
...
X
X
X
X
X
X
2048 / f(OSC)max
2040 / f(OSC)max
2032 / f(OSC)max
...
None
22.8
22.7
22.6
...
0x00FE 11.03 kHz
0x00FD 11.07 kHz
None
None
...
...
...
0x0006
0x0005
0x0004
0x4102
0x4202
0x4302
Notes
402 kHz
536 kHz
562 kHz
938 kHz
1.87 MHz
3.75 MHz
56 / f(OSC)max
48 / f(OSC)max
40 / f(OSC)max
24 / f(OSC)max
12 / f(OSC)max
6 / f(OSC)max
None
0.62
0.53
0.44
0.27
0.13
0.07
None
None
Relative angle error 2x increased
Relative angle error 4x increased
Relative angle error 8x increased
*) Calculated with fosc()max taken from El.Char., item A01; transition distance output A vs. output B with same direction
of rotation.
Table 17: Maximum possible converter frequency for incremental A/B/Z output,
defined by the minimum transition distance
ICHAUS [ IC-HAUS GMBH ]
