IC-MSB_17 Datasheet, PDF (2/32 Pages) IC-Haus GmbH – SIN/COS SIGNAL CONDITIONER

iC-MSB^SAFETY, iC-MSB2
SIN/COS SIGNAL CONDITIONER WITH 1Vpp DRIVER
Rev F3, Page 2/32
DESCRIPTION
iC-MSB 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 permit differential or referenced
input signals; at the same time the modes of operation
differentiate between high and low input impedance.
This adaptation of the iC to voltage or current signals
enables MR sensor bridges or photosensors to be
directly connected up to the device.
The integrated signal conditioning unit allows signal
amplitudes and offset voltages to be calibrated ac-
curately and also any phase error between the sine
and cosine signals to be corrected. Separate zero
signal conditioning settings can be made for the gain
and offset; data is then output either as an analog
or a differential square-wave signal (low/high level
analogous to the sine/cosine amplitude).
For the stabilization of the sine and cosine output
signal levels a control signal is generated from the
conditioned and calibrated input signals which can
power the transmitting LED of optical systems via the
integrated 50 mA driver stage (output ACO). If MR
sensors are connected this driver stage also powers
the measuring bridges.
By tracking the sensor energy supply any signal vari-
ations and temperature and aging effects can be com-
pensated for and the set signal amplitude maintained
with absolute accuracy. At the same time the control
circuitry monitors both whether the sensor is function-
ing correctly and whether it is properly connected;
signal loss due to wire breakage, short circuiting, dirt
or aging, for example, is recognized when control
thresholds are reached and indicated at alarm output
ERR.
iC-MSB is protected against a reversed power sup-
ply voltage; the integrated voltage switch for loads
of up to 20 mA extends this protection to cover the
overall system. The analog output drivers are directly
cable-compatible and tolerant to false wiring; if supply
voltage is connected up to these pins, the device is
not destroyed.
The device configuration and calibration parameters
are CRC protected and stored in an external EEP-
ROM; they are loaded automatically via the I2C in-
terface once the supply voltage has been connected
up.
A safety-technical analysis of iC-MSB on device level
with the inclusion of layout and internal/external cir-
cuitry has been carried out together with the BGIA, St.
Augustin. The result proved iC-MSB’s capability for
safety oriented applications with Siemens Sinumerik
Controls.