IC-TW28 Datasheet, PDF (14/80 Pages) IC-Haus GmbH – 10-BIT SIN/COS INTERPOLATOR

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FUNCTIONAL OVERVIEW
The iC-TW28 is a general-purpose 10-bit Sine/Cosine
interpolator with sophisticated automatic calibration
functions for the ABZ and UVW signal paths, and a
built-in RS422-compatible line driver. It accepts differ-
ential analog sin/cos input signals from magnetic or
optical sensors and calculates (interpolates) the angu-
lar position with the sin/cos cycle, as shown in Figure
8. Typical output is industry-standard incremental AB
quadrature at programmable resolution and/or UVW
commutation signals. Auto calibration means that no
complicated signal analysis or calibration procedure
is required during product design or production. Auto
adaption monitors and adapts signal path error correc-
tion values during operation to maintain optimal perfor-
mance with low error and jitter. An internal EEPROM to
store configuration and calibration data and an accurate
internal oscillator are included.
COS
SIN
A
B
ZERO
Z
U
V
W
Interpolation factor of x5 shown.
Z output suppressed since
ZERO input is low.
UVW signals for 2 pole motor shown.
Figure 8: iC-TW28 Functional Overview
Configuration of the_UiC-TW28 is via dedicated pins, conditions can be monitored. Multiple iC-TW28’s can
Encoder Link (using the A+ and A– pins), or the SPI be accessed from a single host CPU or microcontroller
interface. In pin-con^Vfiguration mode, a limited set of for cost-effective synchronized multi-axis applications.
the most common op_Werating conditions can be selected
for simple stand-alone applications. With SPI or En-
coder Link (serial) configuration, com^Up^Vl^Wet^se^igfⁿle^alx^sib^foi^rlit²y^pa^on^led^motoA^{r s}c^hoo^wnⁿf^.igurable signal path filter provides dynamic re-
access to all iC-TW28 features is available for more sponse characteristics, allowing smooth low-jitter out-
sophisticated applications.
put as well as fast response to changing operating
conditions. An integrated LED intensity control allows
When paired with a local CPU or microcontroller, the maintaining signal amplitudes of optical sensors in the
iC-TW28’s multi-cycle position data and internal status presence of LED ageing and temperature effects.