IC-MN datasheet(2/62 Pages) ICHAUS

2 / 62 page

iC-MN 25-BIT NONIUS ENCODER

WITH 3-CH. SAMPLING 13-BIT Sin/D INTERPOLATION

Rev F2, Page 2/62

DESCRIPTION

Encoder device iC-MN is a 3-channel, simultaneous

sampling sine-to-digital converter which interpolates

sine/cosine sensor signals using a high precision SAR

converter with a selectable resolution of up to 13 bits.

Each input has a separate sample-and-hold stage

which halts the track signal for the subsequent se-

quential digitization. Various 2- and 3-track Vernier

scale computations (after Nonius) can be configured

for the calculation of high resolution angle positions;

these computations permit angle resolutions of up to

25 bits.

The absolute angle position is output via the serial

Interface with clock rates of up to 4 Mbit/s (SSI com-

patible; up to 10 Mbit/s with BiSS C protocol). The

RS422 transceiver required to this end is integrated

on the chip and has both a differential clock input and

a differential line driver for data output.

Programmable instrumentation amplifiers with a se-

lectable gain and offset and phase correction can be

adjusted separately for each channel; these allow dif-

ferential or single-ended input signals. At the same

time the inputs can either be set to high impedance for

voltage signals from magneto resistor sensor bridges,

for example, or to low impedance for adaptation and

use with photosensors which provide current signals,

for instance. This enables the device to be directly

connected up to a number of different optical and

magnetic sensors.

For the purpose of input signal stabilization the con-

ditioned signals are fed into signal level controllers

featuring current source outputs of up to 50 mA (mas-

ter channel) and of up to 10 mA (for the nonius and

segment channels each). These ACOx source pins

either power the LEDs of an optical encoder or the

magneto resistor bridges of a magnetic encoder. If the

control thresholds are reached this event can be re-

leased for alarm messaging using the serial interface

or the NERR output.

Both major chip functions and sensor errors are also

monitored and can be enabled for alarm indication. In

this manner typical sensor errors, such as signal loss

due to wire breakage, short circuiting, dirt or aging,

for example, can be signaled by alarms.

The device features further digital encoder functions

covering the correction of phase errors between the

tracks, for example, or the zeroing or presetting of a

specific position offset for data output. Using the SSI

master also integrated on the chip position data from

multiturn sensors, provided by a second iC-MN, for

example, can be read in and synchronized.

iC-MN is protected against a reversed power supply

voltage; the integrated supply switch for loads of up

to 20 mA extends this protection to cover the over-

all system. The device is configured via an external

EEPROM.

The device described here is a multifunctional iC that contains

integrated BiSS C interface components. The BiSS C process is

protected by patent DE 10310622 B4 owned by iC-Haus GmbH

and its application requires the conclusion of a license (free of

charge).

Download the license at

IC-MN Datasheet(PDF) 2 Page - IC-Haus GmbH

IC-MN Datasheet(HTML) 2 Page - IC-Haus GmbH

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