Drv8889-Q1 Evm Gui (Registers Page) - Texas Instruments DRV8889-Q1EVM User Manual

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– Change the field value from the field view at the right of the screen.
– Double click on any of the register bit to flip the bit (from 0 to 1 or vice versa).
• By default, the write mode is Immediate which writes values to the registers immediately upon change.
• Write mode can be changed to 'Deferred' which will write queue all changes and update the device
registers only when 'Write Register' or 'Write All Registers' is clicked.
• Click on the question mark icon on any register or field to get in-place data sheet help.
3.3.5 Stall Detection
This section covers three different ways to evaluate stall detection using the DRV8889-Q1EVM GUI.
3.3.5.1 Automatically Learn Stall Threshold
1. Configure desired motion profile in the GUI in Speed Mode. The stall detection will not be available for
Step Mode.
2. Configure device settings as desired. The default values should be acceptable for immediate
evaluation. If motor torque is too high while evaluating, change the 'Full-Scale Current' setting or
'Torque' setting to reduce it.
3. Click 'Start Steps' to begin spinning the motor.
4. Enable 'Stall Detection' toggle button available on the 'Stall Detection Panel'.
5. By default, 'Stall Detection Mode' is set to 'Automatic Mode'.
6. Once the target speed is reached, the microcontroller will write the STL_LRN bit to begin learning the
stall threshold value, STALL_TH.
7. After 16 electrical cycles, the GUI displays the message "Please stall motor to complete Stall
Threshold learning sequence." At this point, the user must physically stall the stepper motor.
SLVUBM4A – April 2019 – Revised October 2019
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Figure 9. DRV8889-Q1 EVM GUI (Registers Page)
Copyright © 2019, Texas Instruments Incorporated
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DRV8889-Q1EVM GUI User's Guide
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