MC3PHAC/D

Pin Descriptions

MOTOROLA

3-Phase AC Motor Controller

9

26

SPEED

In standalone mode, during initialization this pin is an output that is used

to determine PWM polarity and base frequency. Otherwise, it is an

analog input used to read a voltage level corresponding to the desired

steady-state speed of the motor.

27

ACCEL

In standalone mode, during initialization this pin is an output that is used

to determine PWM polarity and base frequency. Otherwise, it is an

analog input used to read a voltage level corresponding to the desired

acceleration of the motor.

28

DC_BUS

In standalone mode, during initialization this pin is an output that is used

to determine PWM polarity and base frequency. Otherwise, it is an

analog input used to read a voltage level proportional to the dc bus

voltage.

1. Correct timing of the MC3PHAC is based on a 4.00 MHz crystal or ceramic resonator. Follow the crystal/resonator

manufacturer’s recommendations, as the crystal/resonator parameters determine the external component values required

for maximum stability and reliable starting. The load capacitance values used in the oscillator circuit design should include

all stray capacitances.

Table 2. MC3PHAC Pin Descriptions (Sheet 3 of 3)

Pin

Number

Pin Name

Pin Function

Freescale Semiconductor, Inc.

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