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SENSITRON
SEMICONDUCTOR
TECHNICAL DATA
DATA SHEET 1023, REV. D
Is-out ( Pin 11 ), is the absolute value output of the current sense amplifier.
Is-out = ABS(ISL – ISH)
(4)
ISH ( Pin 12 ), is the non-inverting input of the current sense amplifier.
ISL ( Pin 13 ), is the inverting input of the current sense amplifier.
Quad ( Pin 14 ), is the select input of two-quadrant (Quad=0) or four-quadrant (Quad=1)
operation.
Tach-out ( Pin 15 ), is a fixed pulse width variable frequency output proportional to the
motor speed. A pulse is generated at both rising and falling edges of HA, HB, HC inputs. So
this output can be used as a true tachometer for speed feedback with an external filter or
averaging circuit which usually consists of a resistor and capacitor, as shown in Figs 9 & 10.
Brake ( Pin 16 ), is a digital input which causes the device to inter into brake mode. In brake
mode all three low-side switches are turned off and high-side switches are turned on. The
only conditions that can inhibit the high-side command during brake mode are UVLO, the
output of the PWM comparator, Coast input, or Start/Stop input.
Coast ( Pin 17 ), is a digital input that disables all outputs once pulled high. This input is
internally pulled low.
Start/Stop ( Pin 18 ), is a digital input that disables all outputs once pulled low. This input is
pulled high internally. This input can be used as enable/disable input using a switch. If the
switch is opened, the controller is enabled. If the switch is closed to Gnd, the controller is
disabled.
Signal Gnd ( Pin 19 ), is the reference ground for all control signals of the device. All bypass
capacitors, loop compensation components must be connected as close as possible pin 19.
This pin should not be externally connected to the power ground pins 27 and 28.
HC ( Pin 20 ), is hall input of phase C.
HB ( Pin 21 ), is hall input of phase B.
HA ( Pin 22 ), is hall input of phase A.
HA, HB, HC are designed to accept rotor position information from hall sensors positioned
120
o apart. Motors with 60o position sensing may be used if one or two of the hall-effect
sensor signals is inverted prior to connection to the hall-effect inputs.
HA, HB, HC inputs are internally pulled up, zener clamped to 6.2V, and filtered.
Speed-in ( Pin 23 ), is a speed input to latch the direction input when the motor is spinning
fast.
SMC6MXX-XX
SMC6MXX-XX-1
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