GS-C200 datasheet(24/31 Pages) STMICROELECTRONICS

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Figure 10. Alternative Sequencer-Driver driving.

THE SEQUENCER-DRIVER INTERFACE

The GS-C is a general purpose stepper motor

controller capable to drive any type of motor, i.e.

two, three and five phases motors, by just interfac-

ing it to the right Sequencer-Driver.

Sometime the available Sequencer-Driver requires

two separate Clock lines, one for each direction,

and this requirement is easily fulfilled by the circuit

of figure 10.

PHASE CURRENT PROGRAMMING

As already explained, the possibility to modify the

phase current of a stepper motor according to

different operating conditions, gives substantial im-

provements in term of efficiency and system reliabil-

ity because it minimizes the resonance effects and

the dissipated power.

The phase current programming can be imple-

mented in various modes, either via a software

command by changing the status of the USER

output lines, or by hardware. Of course, the Se-

quencer-Driver must have the current programming

capability. An example of a hardware solution, im-

plemented around a GS-C and GS-D200/200S

module, is shown in fig.11.

The application utilizes the two outputs:

MOV

Movement in execution output

(pin 22)

RAMP

Ramp in execution (pin 23)

of the GS-C module and the

Ioset

Current programming input (pin 9)

of the GS-D module.

The phase current has the shape shown in fig.6, i.e.

it is minimized when the motor is stopped, it has its

maximum value during the acceleration/decelera-

tion ramps, and an intermediate value during the

slew phase.

Figure 11. Phase Current Programming of the GS-D200/200S

GS-C200 AND GS-C200S APPLICATION

GS-C200 / GS-C200S

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