IC-MSC datasheet(2/35 Pages) ICHAUS

2 / 35 page

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iC-MSC SIN/COS SIGNAL CONDITIONER

WITH FAIL-SAFE 1 Vpp LINE DRIVER

Rev A2, Page 2/35

DESCRIPTION

iC-MSC is a signal conditioner with line drivers for

sine/cosine sensors which are used to determine po-

sitions in linear and angular encoders, for example.

Programmable instrumentation amplifiers with se-

lectable gain levels allow differential or single-ended,

referenced input signals; an external reference volt-

age can be connected to input X2 then operated as a

reference input.

The modes of operation differentiate between high

impedance (V-Modes) and low impedance (I-Modes).

This adaptation of the iC to voltage or current signals

enables MR sensor bridges or photosensors to be

directly connected to the device.

The integrated signal conditioning unit allows signal

amplitudes and offset voltages to be calibrated ac-

curately and any phase error between the sine and

cosine signals to be corrected. The channel for the

index signal can be configured separately. The in-

dex signal is then output either as an analog or a

differential square-wave signal (with low/high levels

analogous to the sine/cosine amplitude).

A control signal is generated from the conditioned sig-

nals which can track the transmitting LED of optical

encoders via the integrated 50 mA driver stage (output

ACO). If MR sensors are connected this driver stage

can also track the power supply of the measuring

bridges.

By tracking the sensor’s energy supply any tempera-

ture and aging effects are compensated for, the input

signals stabilized and the exact calibration of the in-

put signals is maintained. This enables a constantly

accurate signal for the subsequent device, a PLC or

motion controller, across the entire operating temper-

ature range.

If control limits are reached, these can be indicated

at the maskable error pin ERR. Faults such as sig-

nal loss due to wire breakage, short circuiting, dirt or

aging, for example, can be detected and indicated.

iC-MSC includes system diagnosis functions which

check whether the sensor is working properly or not.

For all error events the user can select whether the

fault is indicated at the pin ERR or whether the out-

puts should shutdown. At the same time errors can be

stored in the EEPROM to enable failures to be diag-

nosed at a later stage. For encoder applications the

sensor signal regarding signal level and the operating

temperature can be monitored, for example, the latter

using an adjustable on-chip sensor.

Display error pin ERR is bidirectional; a system fault

recognized externally could also be used to shutdown

the outputs.

iC-MSC is protected against reverse polarity and of-

fers its monitored supply voltage to the external circuit,

thus extending the protection to the system (for load

currents up to 20 mA). Reverse polarity protection also

covers the short-circuit-proof output drivers so that an

unintentional faulty wiring during initial operation is

tolerated.

On being activated the device configuration is loaded

via the serial I2C interface from an external EEPROM

and verified with a CRC. A microcontroller can also

configure iC-MSC; the implemented interface is mul-

timaster-capable and allows direct RAM access to

configuration data.

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