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DRV8889-Q1 Datasheet(PDF) 34 Page - Texas Instruments

Part No. DRV8889-Q1
Description  DRV8889-Q1, DRV8889A-Q1 Automotive Stepper Driver with Integrated Current Sense, 1/256 Micro-Stepping, and Stall Detection
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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DRV8889-Q1 Datasheet(HTML) 34 Page - Texas Instruments

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7.3.11.1 VM Undervoltage Lockout (UVLO)
Figure 7-19. Supply Voltage Ramp Profile
Figure 7-20. Supply Voltage Ramp Profile
If at any time the voltage on the VM pin falls below the UVLO falling threshold voltage, all the outputs are
disabled (High-Z) and the charge pump (CP) is disabled. Normal operation resumes (motor driver and charge
pump) when the VM voltage recovers above the UVLO rising threshold voltage.
When the voltage on the VM pin falls below the UVLO falling threshold voltage (4.25 V typical), but is above the
VM UVLO reset voltage (VRST, 3.9 V maximum), SPI communication is available, the digital core of the device is
alive, the FAULT and UVLO bits are made high in the SPI registers and the nFAULT pin is driven low, as shown
in Figure 7-19. From this condition, if the VM voltage recovers above the UVLO rising threshold voltage (4.35 V
DRV8889-Q1
SLVSEE9C – APRIL 2020 – REVISED AUGUST 2020
www.ti.com
34
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