iC-NQL
13-bit Sin/D CONVERTER WITH SSI INTERFACE
Rev B1, Page 23/24
DESIGN REVIEW: Notes On Chip Functions
iC-NQL X2
iC-NQL X3
No.
1
Function, Parameter/Code
Description and Application Hints
ZPOS
Illegal settings:
0x01...0x07, 0x09...0x0F,
0x11...0x17, 0x19...0x1F
Illegal settings of ZPOS delay accurate converter operation following power on.
Depending on the sin/cos input signals (phase angle) the A/B outputs can
provide pulses causing an external counter to alternately count up and down.
This may disturb the startup of a drive if the motion controller tolerates only single
A/B edges during standstill checking.
The converter operation is again accurate when the sin/cos input signals have
changed, by a maximum of 45 angular degrees.
2
3
M2S
Illegal settings:
0x02, 0x03
Illegal settings, enabling a period counter output of 12 or 24 bits, may cause
position data jumping with fast changes in the direction of count (e.g. applications
with length gauges).
It is thus advisable to use 8-bit period counting (M2S 0x01) and to capture the
overflow in the external microcontroller.
Pin DATA
When cycling power pin DATA may show high or low level initially.
With pin TEST = low (e.g. pin open) at least a single low pulse at pin CLK is
required to trigger pin DATA to show a high level after the timeout has elapsed.
When continuing the clock signal after completion of data output, additional zero
bits are output.
With pin TEST = high (e.g. pin wired to VDD) only the timeout needs to elapse to
trigger pin DATA showing high level. When continuing the clock signal after
completion of data output, additional one bits are output.
Table 36: Notes on chip functions
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