Intelligent Motion Systems MDrive34Plus Step Clock, Direction, Quadrature, Up/Down, Input Timing

Step/Direction Function

Step Clock

Direction

Quadrature Function

Channel A

Channel B

Up/Down Function

CW

CCW

Figure 2.3.4: Input Clock Functions

Isolated Logic Input Characteristics

Enable Input

This input can be used to enable or disable the driver output circuitry. Leaving the enable switch open (Logic HIGH, Disconnected) for sinking or sourcing configuration, the driver outputs will be enabled and the step clock pulses will cause the motor to advance. When this input switch is closed (Logic LOW) in both sinking and sourcing configurations, the driver output circuitry will be disabled. Please note that the internal sine/cosine position generator will continue to increment or decrement as long as step clock pluses are being received by the MDrivePlus Microstepping.

Clock Inputs

The MDrivePlus Microstepping features the ability to configure the clock inputs based upon how the user will desire to control the drive. By default the unit is configured for the Step/Direction function.

Step Clock

The step clock input is where the motion clock from your control circuitry will be connected. The motor will advance one microstep in the plus or minus direction (based upon the state of the direction input) on the rising edge of each clock pulse. The size of this increment or decrement will depend on the microstep resolution setting.

Direction

The direction input controls the CW/CCW direction of the motor. The input may be configured as sinking or sourcing based upon the state of the Optocoupler Refer- ence. The CW/CCW rotation, based upon the state of the input may be set using the IMS Motor Interface software included with the MDrivePlus Microstepping.

Quadrature

The Quadrature clock function would typically be used for following applications where the MDrivePlus Microstepping would be slaved to an MDrivePlus Motion Control (or other controller) in an electronic gearing ap- plication.

Up/Down

The Up/Down clock would typically be used in a dual- clock direction control application. This setting is also la- beled CW/CCW in the IMS SPI Motor Interface software.

Input Timing

The direction input and the microstep resolution inputs are internally synchronized to the positive going edge of the

step clock input. When a step clock pulse goes HIGH, the state of the direction input and microstep resolution set- tings are latched. Any changes made to the direction and/ or microstep resolution will occur on the rising edge of the

step clock pulse following this change. Run and Hold Current changes are updated immediately. The follow- ing figure and table list the timing specifications.

Input Filtering

The clock inputs may also be filtered using the Clock IOF pull down of the IMS SPI Motor Interface. The filter range is from 50 nS (10 MHz) to 12.9 µSec. (38.8 kHz).

The configuration parameters for the input filtering is covered in detail in Section 2.4: Configuring the MDrivePlus Microstepping.

Part 2: Interfacing and Configuring 2-15