LM628 Datasheet | National Semiconductor

LM628/LM629 Precision Motion Controller November 1999 LM628/LM629 Precision Motion Controller General Description The LM628/LM629 are dedicated motion-control processors designed for use with a variety of DC and brushless DC servo motors, and other servomechanisms which provide a quadrature incremental position feedback signal. The parts perform the intensive, real-time putational tasks required for high performance digital motion control. The host control software interface is facilitated by a high-level mand set. The LM628 has an 8-bit output which can drive either an 8-bit or a 12-bit DAC. The ponents required to build a servo system are reduced to the DC motor/actuator, an incremental encoder, a DAC, a power amplifier, and the LM628. An LM629-based system is similar, except that it provides an 8-bit PWM output for directly driving H-switches. The parts are fabricated in NMOS and packaged in a 28-pin dual in-line package or a 24-pin surface mount package (LM629 only). Both 6 MHz and 8 MHz maximum frequency versions are available with the suffixes -6 and -8, respectively, used to designate the versions. They incorporate an SDA core processor and cells designed by SDA. Features n n n n n n n n n n n n 32-bit position, velocity, and acceleration registers Programmable digital PID filter with 16-bit coefficients Programmable derivative sampling interval 8- or 12-bit DAC output data (LM628) 8-bit sign-magnitude PWM output data (LM629) Internal trapezoidal velocity profile generator Velocity, target position, and filter parameters may be changed during motion Position and velocity modes of operation Real-time programmable host interrupts 8-bit parallel asynchronous host interface Quadrature incremental encoder interface with index pulse input Available in a 28-pin dual in-line package or a 24-pin surface mount package (LM629 only) DS009219-1 FIGURE 1. Block Diagram TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 1999...