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 Microstepping MForce PowerDrive.
Clock Inputs
The Microstepping MForce PowerDrive 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 ris- ing 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 Microstepping MForce PowerDrive.
Quadrature
The Quadrature clock function would typically be used for following applications where the Microstepping MForce PowerDrive would be slaved to an MForce PowerDrive Microstepping (or other controller) in an electronic gearing application.
Up/Down
The Up/Down clock would typically be used in a dual- clock direction control application.
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 settings 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 following figure and table list the timing specifications.
Step/Direction Function
Step Clock
Direction
Quadrature Function
Channel A
Channel B
Up/Down Function
CW
CCW
Input Filtering
The clock inputs may also be filtered using the Clock IOF
pull down of the IMS SPI Motor Interface. The filter range Figure 2.4.2: Input Clock Functions 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 Microstepping MForce PowerDrive.
20 | Microstepping MForce PowerDrive Manual Revision R032008 |
