DRV8426PWPR datasheet(26/49 Pages) TI1

Part #	DRV8426PWPR

Description	DRV8426 Stepper Driver With Integrated Current Sense, 1/256 Microstepping, STEP/DIR Interface and smart tune Technology

PDF	49 Pages

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Manufacturer	TI1 [Texas Instruments]

Direct Link	http://www.ti.com

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26 / 49 page

Output

nFAULT

DRV8426

SLOSE55 – MAY 2020

www.ti.com

Product Folder Links: DRV8426

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Figure 18. Quad-Level Input Pin Diagram

Figure 19 shows the input structure for STEP, DIR and nSLEEP pins.

Figure 19. Logic-Level Input Pin Diagram

7.3.9.1 nFAULT Pin

The nFAULT pin has an open-drain output and should be pulled up to a 5-V or 3.3-V supply. When a fault is

detected, the nFAULT pin will be logic low. nFAULT pin will be high after power-up. For a 5-V pullup, the

nFAULT pin can be tied to the DVDD pin with a resistor. For a 3.3-V pullup, an external 3.3-V supply must be

used.

Figure 20. nFAULT Pin

7.3.10 Protection Circuits

The DRV8426 device is fully protected against supply undervoltage, charge pump undervoltage, output

overcurrent, and device overtemperature events.

7.3.10.1 VM Undervoltage Lockout (UVLO)

If at any time the voltage on the VM pin falls below the UVLO-threshold voltage for the voltage supply, all the

outputs are disabled, and the nFAULT pin is driven low. The charge pump is disabled in this condition. Normal

operation resumes (motor-driver operation and nFAULT released) when the VM undervoltage condition is

removed.

DRV8426PWPR Datasheet(PDF) 26 Page - Texas Instruments