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IC-PT3310 Datasheet, PDF (2/9 Pages) IC-Haus GmbH – 6-CH. PHASED ARRAY OPTO ENCODER (33-1000) | |||
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iC-PT 3310
preliminary
6-CH. PHASED ARRAY OPTO ENCODER (33-1000)
Rev A6, Page 2/9
DESCRIPTION
iC-PT 3310 is an optical sensor IC with integrated
photosensors whose signals are converted into volt-
ages by low-noise transimpedance ampliï¬ers. Pre-
cise voltage comparators with hysteresis are used to
generate the digital signals, supplied to the output
pins via differential +/- 4 mA push-pull drivers.
The built-in LED power control with its 40 mA driver
stage permits a direct connection of the encoder
LED. Regardless of aging or changes in temperature
the received optical power is kept constant. An exter-
nal resistor presets the photocurrent operating point
and thus the desired illumination level.
Selection input SEL chooses for three different op-
erating modes: regular A/B operation, A/B operation
with 2-fold interpolation, or analog operation. With
analog operation the ampliï¬ed signal voltages are
available at the outputs for inspection and monitoring
encoder assembly.
Typical applications of iC-PT devices are incremental
encoders for motor feedback and commutation. To
this end, device version iC-PT 3310 provides differ-
ential A/B tracks and a differential index track, each
consisting of multiple photo sensors. The layout of
the signal ampliï¬ers is such that there is an excellent
paired channel matching, eliminating the needs for
signal calibration in most cases.
Additionally, three more tracks are provided to gener-
ate motor commutation information for the U, V and
W outputs, for instance with 120 degree phase shift
to operate 3-phase brushless motors (period count
and phase shift can be varied by the code disc ap-
plied).
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