LM628, LM629

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SNVS781C – JUNE 1999 – REVISED MARCH 2013

LM628/LM629 Precision Motion Controller

Check for Samples: LM628, LM629

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FEATURES

DESCRIPTION

The

LM628/LM629

are

dedicated

motion-control

2

•

32-bit Position, Velocity, And Acceleration

processors designed for use with a variety of DC and

Registers

brushless

DC

servo

motors,

and

other

•

Programmable Digital PID Filter with 16-bit

servomechanisms

which

provide

a

quadrature

Coefficients

incremental position feedback signal. The parts

perform the intensive, real-time computational tasks

•

Programmable Derivative Sampling Interval

required for high performance digital motion control.

•

8- or 12-bit DAC Output Data (LM628)

The host control software interface is facilitated by a

•

8-bit Sign-magnitude PWM Output Data

high-level command set. The LM628 has an 8-bit

(LM629)

output which can drive either an 8-bit or a 12-bit

DAC. The components required to build a servo

•

Internal Trapezoidal Velocity Profile Generator

system are reduced to the DC motor/actuator, an

•

Velocity, Target Position, and Filter

incremental encoder, a DAC, a power amplifier, and

Parameters may be Changed During Motion

the LM628. An LM629-based system is similar,

•

Position and Velocity Modes of Operation

except that it provides an 8-bit PWM output for

directly driving H-switches. The parts are fabricated in

•

Real-time Programmable Host Interrupts

NMOS and packaged in a 28-pin dual in-line package

•

8-bit Parallel Asynchronous Host Interface

or a SOIC-24 package (LM629 only). Both 6 MHz and

•

Quadrature Incremental Encoder Interface with

8 MHz maximum frequency versions are available

Index Pulse Input

with the suffixes -6 and -8, respectively, used to

designate the versions. They incorporate an SDA

•

Available in a 28-pin Dual In-line Package or a

core processor and cells designed by SDA.

SOIC-24 Package (LM629 Only)

Figure 1. Block Diagram

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PRODUCTION DATA information is current as of publication date.

Copyright © 1999–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.