Starting Speed
Acceleration Rate
Stopping Speed
Introduction to the EVM
SPEED DOWN:
Push and hold for speed down the motor with internal fixed linear deceleration rate (the
same as acceleration rate). Limited to the MIN speed by software (100 pps at full micro-step, 200 pps at
half micro-step).
DIR:
Change the direction of the stepper, can be changed as the motor is spinning, but may cause the
motor to stall.
FULL/HALF:
Change stepping mode, can be changed as the motor is spinning, but may cause the motor
to stall. Also updates the MIN/MAX and accelerating/decelerating rate.
Figure 4. Speed Curve of the DRV8833C
2.4
Operating the EVM
The DRV8833CEVM operates without the need of a GUI. After the power supply and motor is connected
to the board, the motor will spin up by pressing the START/STOP button. The speed of the motor can be
increased by pressing the SPEED UP button and can be decreased by pressing the SPEED DOWN
button. The direction will be changed by removing or connecting the shunt on the DIR jumper. Leaving the
FULL/HALF jumper open, puts the motor into half-step mode. Keeping the FULL/HALF closed places the
motor full-step mode. Remove the shunt on nSLEEP jumper to put the DRV8833C in sleep mode. The
chopping current of the EVM can be modified by adding or removing the shunts on J1 and J3 which will
change the value of the sense resistor.
5
SLVUAD4 – November 2014
DRV8833C Evaluation Module
Copyright © 2014, Texas Instruments Incorporated
