MSK1695 MSK, MSK1695 Datasheet - Page 3

• Manufacturer Part Number: MSK1695
• Description: BRUSHLESS MOTOR SPEED CONTROLLER
• Manufacturer: MSK

MSK 1695 PIN DESCRIPTIONS
V+ - is the power connection from the hybrid to the
bus. The external wiring to the pin should be sized
according to the RMS current required by the motor.
This pin should be bypassed by a high quality mono-
lithic ceramic capacitor for high frequencies and enough
bulk capacitance to keep the V+ power supply from
drooping.
AØ OUT, BØ OUT, CØ OUT-are the connections to the
motor phase windings from the bridge output. The wir-
ing to these pins should be sized according to the mo-
tor current requirements. There are no internal short
circuit protection provisions for these output pins in
the hybrid. Shorts to V+ or ground from these pins
must be avoided or the bridge will be destroyed.
VRTN-is the power return connection from the hybrid
to the bus. All ground returns internal to the hybrid
connect to this point in a star configuration. All exter-
nal ground connections to this point should be made in
a similar fashion. The V+ capacitors should be returned
to this pin as close as possible. Wire sizing to this pin
connection should be made according to the required
current.
GND - are the ground pins that connect to the ground
plane for circuitry inside the device.
BRAKE - is the pin for commanding the output bridge
into a motor brake mode. When this pin is taken low,
normal operation of the hybrid proceeds. When this
pin is taken high, the three high side switches in the
bridge turn off and the three lowside switches turn
fully on. This will cause rapid deceleration of the motor
and will cease motor operation until taken low again.
The pin left open is internally pulled high.
60/120 - is a pin for selecting the orientation of the
commutation scheme of the motor. A high state will
produce 60/300 degree commutation, where as a low
state will produce 120/240 degree commutation. Logic
levels for this input are TTL compatible. It is internally
pulled high.
APPLICATION NOTES
3
HALL A, B & C - are the hall input pins from the hall
devices in the motor. These pins are internally pulled
up to 6.25 volts. The halls reflect a 120/240 degree
commutation scheme.
VREF - is a 6.25 volt regulated output that can be used
to power the hall devices in various motors. Up to 15
milliamps of current is available.
SPEED COMMAND - is the input for controlling the
motor speed. The operational command voltage range
should be 0 volts to +5 volts. Negative input voltages
must be avoided while the maximum positve input
voltage should not exceed +5 volts.
PRELIMINARY Rev. B 11/06