IC-PTH datasheet(2/14 Pages) ICHAUS

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iC-PT H-Series

6-CH. PHASED ARRAY OPTO ENCODERS

Rev B2, Page 2/14

DESCRIPTION

The iC-PT H-series represents advanced optical en-

coder ICs featuring integrated photosensors arranged

as an HD Phased Array, providing signal fidelity at

relaxed alignment tolerances.

Its typical application are incremental encoders for

motor speed control and commutation. To this end,

the devices provide differential A/B tracks, a differ-

ential index track and three more tracks to generate

block commutation signals.

Where the optical radius and the native cycles per

revolution (CPR) are determined by the device ver-

sion (refer to iC-PT26xxH, iC-PT33xxH, iC-PT39xxH

details given further below), the adaption to the motor

polecount is carried out by the code disc, for instance

with 4 CPR and 90 degree phase shift to operate

4-phase brushless motors1).

Blue-enhanced photosensors allow the application of

LEDs with short wavelenght leading to an outstand-

ing jitter performance due to improved signal contrast

(recommended LED: iC-TL46). However, for most

devices the photosensors are IR compatible as well

(recommended LED2): iC-TL85).

Low-noise transimpedance amplifiers, arranged in a

paired layout to ensure excellent channel matching,

are used to convert the scanner’s signals into voltages

of several hundred millivolts3).

Precision comparators with hysteresis generate the

digital signals subsequently, either native or interpo-

lated, which are then output by differential ± 4 mA

push-pull drivers.

The built-in averaging LED power controller with its

40 mA driver permits a direct connection of the en-

coder LED. The received optical power is kept con-

stant regardless of aging effects or changes in tem-

perature.

Various operating modes are selectable at multi-level

input SEL4): digital output with native (x1) or interpo-

lated resolution (x2 or x4), analog output or mixed

analog/digital output; the latter combines an output

of sine/cosine signals with comparated UVW commu-

tation signals. During analog operation the amplified

signal voltages are available at the outputs for inspec-

tion and monitoring of encoder assembly, or to feed

external interplation circuits.

Index gating is also pin-selectable at input T14): the

options are ungated, respectively T-gated if using in-

terpolated output, B-gated and AB-gated.

All devices run at single-sided supplies from 3.5 V up

to 5.5 V and feature a low power consumption.

iC-PT26xxH Series

Optical radius 11.0 mm, code disc ∅ 26.0 mm;

Native CPR: 256, 500, 1000, 1250, 1500.

iC-PT33xxH Series

Optical radius 14.5 mm, code disc ∅ 33.0 mm;

Native CPR: 360, 500, 1000, 1024, 1250, 1500, 1800

CPR.

For 2000, 2048, and 2500 CPR refer to

iC-PT33xxH Encoder blue® Series.

iC-PT39xxH Series

Optical radius 17.5 mm, code disc ∅ 39.0 mm;

Native CPR: 512, 1000, 1024, 2048.

1) Standard on code discs available for sampling.

2) Except for Encoder blue® series: iC-PT3320H, PT3348H, PT3325H.

3) Operating point varies by device version and CPR.

4) For ease of replacement, iC-PT H-Series pin functions are backwards

compatible to iC-PT series ICs.

Encoder blue is a trademark of iC-Haus GmbH.

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