December 2003
Intermediate to advanced
320 pages
9h 28m
English
Content preview from Analog Interfacing to Embedded Microprocessor Systems, 2nd Edition
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Power-Up Issues
One problem with DC motors is what happens when power is applied. We’ve
already looked at the issues surrounding the power-up state of microcontroller
outputs. There are similar issues surrounding any DC motor design, including
designs that use packaged controllers.
Typically, the logic that controls the motor H-bridge or analog amplifier
operates from 5 V or 3.3 V. The motor power supply may be 12 V, 24 V, or even
50 V. If the motor power supply comes up first, the inputs to the H-bridge or
amplifier may be in an invalid state and the motor may jerk momentarily. In a
system with a limited range of motion, such as a robotic arm, the
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