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Chapter 01
Introduction to the CY545

CY545 Stepper System Controller

In 1979 Cybernetic Micro Systems invented the first Single Chip Stepper Motor Controller, the CY500. Since then we have continued to design improved versions, the CY512 (1981), the CY525 (1983). This manual introduces our (1988) fourth generation device, the CY545 Stepper System Controller. A fifth generation device (1993) the CY550 is also available. The CY545 is the first Stepper Motor System Controller chip, to offer completely new features, such as:

• 27,000 Steps/Sec
• Million step motions
• Serial or Parallel interface
• LED display interface
• LCD display interface
• Thumbwheel switch interface

We believe this device offers all of the features you want to implement sophisticated motion control systems at very low cost.

For example, our CY500, CY512 and CY525 controllers work best in systems with a host computer that issues single commands, or sequences of commands as a program, to the controller, and then tends to other system functions while the Stepper Motor Controller is running the motor. Maximum performance is gained when the host CPU is closely coupled to the Stepper Motor Controller IC.

While the CY545 is also capable of working with a host CPU in a closely coupled fashion, the CY545 contains extensions that allow it to function very well in a stand-alone system. In fact, it is possible to base a simple controller design around the CY545, and operate a machine with no CPU at all, bringing the benefits of intelligent, programmable stepper motor control to applications that do not justify a host computer system.

Basic Features

• Single 40 pin 5 volt CMOS integrated circuit
• Simple ASCII letter based commands and parameters
• Simple application for basic stepper motor functions
• Operation with a host computer or stand alone
• Built-in Display interfaces for alpha-numeric LED or LCD

Motion Control Functions

• Programmable step rates from 20 steps/sec to over 27,000 steps/sec provide extremely large dynamic range.
• Linear acceleration curves for optimum performance.
• Partial accelerations make short moves in the least time.
• Separate parameters for starting rate, final rate, and acceleration values allow totally programmable motions.
• Relative moves of +/- 16 Mega steps from current position. Absolute moves within a 16 Mega step range.
• Continuous moves with no specific number of steps, allow acceleration from the starting rate to the final rate, followed by an indefinite run length.
• Internal step position updated during all motions.

Motor Support Signals

• Step Pulse and Direction signals work with standard power driver modules.
• Internal or external direction control.
• Forced ramp down and abort signal for emergency or externally controlled end of motion.
• Separate CW and CCW limit signals inhibit stepping beyond one limit, but allow stepping in the opposite direction.
• Moving/not moving signal for use as Motion Complete or to switch stepper power driver between high and park power.
• Externally operated jog mode, with direction control and start/stop control from one signal, all at programmable manual control step rates between 1 and 1K steps/sec.
• Automatic home sensor seek, with backlash compensation.

General Command Functions and Special Features

• Parallel command interface with two line handshake, compatible with CY233 network communications controller.
• Serial command interface with fixed or adaptive baud rate selection.
• Support for up to 64K of optional external command memory implemented as RAM, ROM, EPROM, or EEPROM.
• Support for optional external setting of parameter values, through standard thumbwheel switches.
• Selectable display for output messages from standard serial, standard parallel, or CY233 interfaces, plus special support for a parallel HP HDSP-211x LED display, or a CY325 based serial LCD display.
• User controlled, multi-purpose I/O lines, for:
• set and clear bit functions
• test bit and branch functions
• wait for bit value functions
• automatic home seek functions

Prototyping Board Support

The CYB-545 Prototyping board implements most of the available features of the CY545 Stepper System Controller. A more complete description may be found in the chapter on Prototyping Support (15 - Proto Boards).

CY545 Stepper Motor System Controller