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SENSITRON
SEMICONDUCTOR
TECHNICAL DATA
DATA SHEET 1023, REV. D
Dir-in ( Pin 24 ), is the direction digital input. Logic “H’ correspond to forward rotation, and
logic “L” correspond to reversed rotation.
The direction input can be latched by Speed-in input. As long as Speed-in is less than
0.250V, the direction latch is transparent. When Speed-in is higher than 0.250V changing
direction of rotation will enable coast until the Speed-in drops below 0.250V. Direction latch is
recommended in two-quadrant operation mode to allow the motor to coast to a safe speed
before reversing.
CSH ( Pin 25 ),is the positive terminal of the current sense resistor.
CSL ( Pin 26 ),is the negative terminal of the current sense resistor.
The current sense terminals produce a differential voltage equal to the motor current times
the sense resistance (5 or 10 m
Ω typical). There is an internal 2nF filter capacitor across pins
25 and 26, There is also a 100
Ω resistor between each pin and each end of the current
sense resistor. Pins 25 and 26 shall be externally connected to pins 12 and 13 to activate
the cycle-by-cycle current limiting.
+VDC Rtn ( Pins 27 & 28 ), are the motor supply return. Pins 27 and 28 should not be
connected to the signal Gnd pin 19.
Source Terminals ( Pin 29, 30, 34, 35, 39, 40 ), are the source terminals of the three arms
of the three-phase bridge. These pins shall be shorted together externally using a low
impedance bus to minimize power loss.
Phase C Outputs ( Pin 31, 32 ), are phase C terminals. Both terminals shall be used.
Phase B Outputs ( Pin 36, 37 ), are phase B terminals. Both terminals shall be used.
Phase A Outputs ( Pin 41, 42 ), are phase A terminals. Both terminals shall be used.
+VDC ( Pins 33, 38, 43 ), are the motor input power supply positive terminal. These pins
shall be shorted together externally using a low impedance bus. +VDC bus should bypassed
to +VDC Rtn with adequately voltage-rated low ESR capacitor, whose value can is least 10-
15
µF per ampere of average motor current.
SMC6MXX-XX
SMC6MXX-XX-1
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