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Section 4

Theory of Operation

Section Overview

This section will cover the circuit operation for the IM483 microstepping

driver.

 Circuit Operation.

 Microstep Select Inputs.

 Stepping.

 Dual PWM Circuit.

 Fullstep Output.

 Timing.

Circuit Operation

Microstepping drives have a much higher degree of suitability for applications

that require smooth operation and accurate positioning at low speeds than do

half/fullstep drivers and reduction gearing. The IM483, which can to be set to

microstep resolutions as high as 51,200 microsteps/rev (256 microsteps/step)

using a 1.8° stepping motor, is ideal for such applications.

In order to subdivide motor steps into microsteps while maintaining positional

accuracy, precise current control is required. The IM483 accomplishes this by

the use of a unique Dual PWM circuit built into the patented IM2000

Microstep Controller ASIC, which resides at the heart of the IM483. This

Figure 4.1: IM483 Block Diagram

INPUT

LOGIC

INPUT

LOGIC

ISOLATION

CIRCUITRY

SINE/COSINE

POSITION

GENERATOR

MICROSTEP

RESOLUTION

SELECTION

STEP CLOCK

DIRECTION

ENABLE

RESET

CURRENT

CONTROL

USER

INTERFACE

POWER

SUPPLY

OPTO

SUPPLY

20kHz CHOP.

OSC

PROTECTION

CIRCUIT

IM2000 MICROSTEP

CONTROLLER

IM483 MICROSTEPPING DRIVER

PHASE A/B

OUTPUT

CIRCUITRY

CURRENT

SENSING

STEPPING

MOTOR

SHORT

CIRCUIT

PROTECTION

OVER CURRENT

PROTECTION

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 76 77

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