iC-NQL
13-bit Sin/D CONVERTER WITH SSI INTERFACE
Rev B1, Page 14/24
Incremental output to A, B and Z
nals. A digital zero-delay glitch filter then takes care
There are two criteria which must be considered when of a temporal edge-to-edge separation, guaranteeing
setting the maximum possible converter frequency via spike-free output signals after an ESD impact to the
the FCTR register:
sensor, for instance.
1. The maximum input frequency
A serial data output is simultaneously possible at any
2. System limitations, e.g. due to slow counters or time. However, for the transfer of angle data to the
cable transmission
output register the incremental output is halted for one
period of the clock signal applied to pin CLK.
When facing system limitations it is useful to prese-
lect a minimum transition distance for the output sig-
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
0x4304
Notes
325 kHz
542 kHz
1.08 MHz
1.3 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 / 40 / Res.
None
0.16
0.26
0.53
0.64
1.27
2.1
4.2
5.1
6.5
Relative angle error 2x increased
Relative angle error 4x increased
Relative angle error 8x increased
10.8
21.6
26.0
*) Calculated with fosc()min taken from Electrical Characteristics item A01.
Table 15: Max. converter frequency for incremental A/B/Z output, defined by the max. 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 10 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 10.05 kHz
0x00FD 10.09 kHz
None
None
...
...
...
0x0006
0x0005
0x0004
0x4102
0x4202
0x4304
Notes
366 kHz
427 kHz
512 kHz
854 kHz
1.7 MHz
2.1 MHz
56 / f(OSC)max
48 / f(OSC)max
40 / f(OSC)max
24 / f(OSC)max
12 / f(OSC)max
10 / f(OSC)max
None
0.62
0.53
0.44
0.27
0.13
0.11
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; the min. transition distance refers to output A vs. output B
without reversing the sense of rotation.
Table 16: Max. converter frequency for incremental A/B/Z output, defined by the min. transition distance
ICHAUS [ IC-HAUS GMBH ]
