SLVSB18H March 2012 – August 2016 DRV8835
The appropriate local bulk capacitance is an important factor in motor drive system design. More bulk capacitance is generally beneficial, but may increase costs and physical size.
The amount of local capacitance needed depends on a variety of factors, including:
There is a weak pulldown resistor (approximately 100 kΩ) to ground on the input pins.
VCC and VM may be applied and removed in any order. When VCC is removed, the device enters a low power state and draws very little current from VM. To minimize current draw, keep the input pins at 0 V during sleep mode.
The VM voltage supply does not have any undervoltage lockout protection (UVLO), so as long as VCC > 1.8 V, the internal device logic remains active. This means that the VM pin voltage may drop to 0 V, however, the load may not be sufficiently driven at low-VM voltages.