User Manual

Cuttable traces on the dual VNH5019 motor
driver shield for separately accessing ENA/DIAGA
and ENB/DIAGB.
The following diagram shows the relevant section of the board schematic:
Schematic diagram of the enable/diagnostic
circuit on the Pololu dual VNH5019 motor driver
shield.
To separately access both ENA/DIAGA and ENB/DIAGB, you can use a knife to cut the trace between
the through-hole pair and then run a wire to the right (B) pin. Note that once the connection between
the two pins is severed, only ENA/DIAGA will have the required pull-up resistor; you will need to add
a separate pull-up resistor for the ENB/DIAGB pin, or connect it to a microcontroller I/O line with a
built-in pull-up resistor enabled. Also, you might consider adding a 1k current-limiting resistor in series
with the ENB/DIAGB connection as a safeguard against incidental shorts.
You can later use a shorting block to restore the default combined EN/DIAG line if you populate the
severed hole pair with a 2×1 piece of the included 0.1″ male header strip.
Pololu Dual VNH5019 Motor Driver Shield User’s Guide © 2001–2017 Pololu Corporation
6. Customizing the Shield Page 29 of 35