IP200 ETC [List of Unclassifed Manufacturers], IP200 Datasheet - Page 8

• Manufacturer Part Number: IP200
• Description: Interpolation Circuit for Incremental Measuring Systems
• Manufacturer: ETC [List of Unclassifed Manufacturers]

4
4.1
The position/angle result is available via the integrated serial interface in a 28-bit two's-complement format.
As described, the zero point can be generated using the REFP and REFN reference signal inputs, or it can be
set via the serial interface. By activating the trigger input, measuring result can be kept in a 2-level deep
buffer register in a manner asynchronous to the access via the interfaces.
Simultaneously, the IP200 outputs the phase shifted square wave sequences (known by incremental
measuring transducers) which can be counted in single or quadruple way.
A synchronous reference pulse is generated when the angle of 0° (refer also to Fig. 2) is passed through and
when the analogue differential input voltage between REFP and REFN exceed the positive comparator
hysteresis level. If the differential input voltage is permanently above this level, the reference pulse is
generated once during every signal period. A configuration bit can disable the generation of the reference
pulse.

Note that the IP200 IC based on a digital interpolation method. This means that the quantization errors (the
so-called  1 errors) which are inevitable with A/D converters are superposed upon the speed-proportional
A/B output signals. Analogue control systems must feature a corresponding low-pass behaviour when the IC
is used in such systems.
D-09116 Chemnitz, Germany
Digital Operation Modes
Zwickauer Straße 227
Output Signals / Counter Value
Figure 5
GEMAC
Gesellschaft für
Mikroe lektronikanwendung Chemnitz mbH
internal
Counter
OREF
A
B
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t
Phone:
Fax::
Internet:
Email:
Date: 20.04.04
pp
: minimal Interval Time /
Edge Interval
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[phone]
www.gemac-chemnitz.de
[e-mail]
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Page 8 of 30
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Title:
Data Sheet GC-IP200
Name of Document:
43500-DB-2-1-E-IP200.pdf
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