IC-NQL Datasheet, PDF (14/24 Pages) IC-Haus GmbH – 13-bit Sin/D CONVERTER WITH SSI INTERFACE

iC-NQL
13-bit Sin/D CONVERTER WITH SSI INTERFACE
Rev B1, Page 14/24
Incremental output to A, B and Z
There are two criteria which must be considered when
setting the maximum possible converter frequency via
the FCTR register:
nals. A digital zero-delay glitch filter then takes care
of a temporal edge-to-edge separation, guaranteeing
spike-free output signals after an ESD impact to the
sensor, for instance.
1. The maximum input frequency
2. System limitations, e.g. due to slow counters or
cable transmission
A serial data output is simultaneously possible at any
time. However, for the transfer of angle data to the
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
FCTR
fout @ finmax
A, B
Requirem.
bin dec finmax
at high input frequency
0x0004 325 kHz
X X f(OCS)min / 40 / Resolution None
0x4102 542 kHz
X X f(OSC)min / 24 / Resolution Relative angle error 2x increased
0x4202 1.08 MHz
X X 2 x f(OSC)min / 24 Res.
Relative angle error 4x increased
0x4304 1.3 MHz
X X 4 x f(OSC)min / 40 / Res.
Relative angle error 8x increased
Notes *) Calculated with fosc()min taken from Electrical Characteristics item A01.
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
0.64 5.1 26.0
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*
FCTR
0x00FF
fout @ t_MTD
A, B
10 kHz
Requirem.
bin dec
XX
at A, B
t_MTD
2048 / f(OSC)max
at high input frequency
None
t_MTD [µsec]
22.8
0x00FE 10.05 kHz
X X 2040 / f(OSC)max
None
22.7
0x00FD 10.09 kHz
X X 2032 / f(OSC)max
None
22.6
...
...
... ... ...
...
...
0x0006 366 kHz
X X 56 / f(OSC)max
None
0.62
0x0005 427 kHz
X X 48 / f(OSC)max
None
0.53
0x0004 512 kHz
X X 40 / f(OSC)max
None
0.44
0x4102 854 kHz
X X 24 / f(OSC)max
Relative angle error 2x increased 0.27
0x4202 1.7 MHz
X X 12 / f(OSC)max
Relative angle error 4x increased 0.13
0x4304 2.1 MHz
X X 10 / f(OSC)max
Relative angle error 8x increased 0.11
Notes *) 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