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MC2840

Navigator™ Motion Processor

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Introduction

This manual describes the operational characteristics of the MC2340, MC2320 and MC2310 Motion

Processors from PMD. These devices are members of PMD’s second-generation motion processor

family, which consists of 14 separate products organized into 5 series.

Each of these devices are complete chip-based motion processors. They provide trajectory

generation and related motion control functions. Depending on the type of motor controlled they

provide servo loop closure, on-board commutation for brushless motors, and high speed pulse and

direction outputs. Together these products provide a software-compatible family of dedicated

motion processors that can handle a large variety of system configurations.

Each of these chips utilize a similar architecture, consisting of a high-speed computation unit, along

with an ASIC (Application Specific Integrated Circuit). The computation unit contains special on-

board hardware that makes it well suited for the task of motion control.

Along with similar hardware architecture these chips also share most software commands, so that

software written for one chipset may be re-used with another, even though the type of motor may be

different.

Each chipset consists of two PQFP (Plastic Quad Flat Pack) ICs: a 100-pin Input/Output (I/O)

chip, and a 132-pin Command Processor (CP) chip.

The four different series in the Navigator family are designed for a particular type of motor or

control scheme. Here is a summary description of each series.

Family Summary

MC2100 Series (MC2140, MC2120, MC2110) – This series outputs motor commands in either

Sign/Magnitude PWM or DAC-compatible format for use with brushed servo motors, or with

brushless servo motors having external commutation.

MC2300 Series (MC2340, MC2320, MC2310) – This series outputs sinusoidally commutated

motor signals appropriate for driving brushless motors. Depending on the motor type, the output is a

two-phase or three-phase signal in either PWM or DAC-compatible format.

MC2400 Series (MC2440, MC2420, MC2410) – This series provides microstepping signals for

stepping motors. Two phased signals per axis are generated in either PWM or DAC-compatible

format.

MC2500 Series (MC2540, MC2520, MC2510) – These chipsets provide high-speed pulse and

direction signals for stepping motor systems.

MC2800 Series (MC2840, MC2820) – This series outputs sinusoidally or 6-step commutated motor

signals appropriate for driving brushless servo motors as well as PWM or DAC- compatible outputs

for driving brushed servo motors.

MC2300 Technical Specifications

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