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462
S e c t i o n 1 . 7
I n t e r f a c i n g t o t h e I B 4 6 2 H
S e c t i o n O v e r v i e w
The IB462H was designed to be incorporated directly in the user’s printed
circuit board. In order to operate, the IB462H must have the following
connections:
Layout and interface guidelines.
Motor power (+V).
+5 VDC input.
Current adjust reference voltage.
Logic interface.
Minimum required connections.
The section will also demonstrate the use of the Sense A and Sense B outputs,
which can be utilized for over current protection, as well as a circuit which
will automatically reduce the current in the motor windings when the step
clock signal is removed. Their use is optional.
L a y o u t a n d I n t e r f a c e G u i d e l i n e s
Logic level signals should not run parallel to motor phase signals. The motor
phase signals will couple noise onto the logic level signals. This will cause
rough motor motion and unreliable system operation. Motor phase signals
should be run as pairs and should be separated from other signals by ground
traces where possible.
When leaving the board, motor cables should not run parallel with other wires.
Phases should be wired as using twisted pairs. If motor cabling in excess of
one foot is required, motor cabling should be shielded twisted pairs to reduce
the transmission of EMI. The shield must be tied to AC ground at driver end
only. The motor end must be left floating.
If more than one driver is connected to the power supply, separate power and
ground connections from each driver to the power supply should be used.
The power supply cables need to be a twisted pair if power is connected from
a source external to the board. If multiple drivers are used with an external
power source and it is not possible to run separate power and ground
connections to each driver, a low impedance electrolytic capacitor equivalent
to two times the total capacitance of all driver capacitors and of equal voltage
must be placed at the power input of the board.
