SLVSEE8B November 2019 – May 2021 DRV8899-Q1
In a stepper motor, the full-scale current (IFS) is the maximum current driven through either winding. This quantity depends on the VREF voltage and the TRQ_DAC setting.
The maximum allowable voltage on the VREF pin is 2.2 V. DVDD can be used to provide VREF through a resistor divider.
During stepping, IFS defines the current chopping threshold (ITRIP) for the maximum current step.