Pololu Dual VNH5019 User Manual
Page 17
PIN
Default State
Description
VIN
The connection point for the positive side of the 5.5 – 24 V motor power supply.
Since the overvoltage protection can be as low as 24 V, we do not recommend using
24 V batteries for VIN.
VDD
The connection point for the positive side of the logic power supply (typically 2.5 –
5 V). The only function of this pin is to power the internal pull-ups on the enable
lines, M1EN/DIAG and M2EN/DIAG.
VOUT
This pin gives you access to the motor power supply after the reverse-voltage
protection MOSFET (see the board schematic in
supply reverse-protected power to other components in the system, but it should not
be used for high currents. This pin should only be used as an output.
GND
Ground connection points for logic and motor power supplies. The controlling
device and the motor driver must share a common ground.
MxA/B
Output of half-bridge A/B. Each half-bridge connects to one terminal of a DC
motor.
MxPWM
LOW
Pulse-width modulation input: a PWM signal on this pin corresponds to a PWM
output on the corresponding driver’s motor outputs. When this pin is low, the motor
outputs are high impedance. When it is high, the output state is determined by the
states of the MxINA/B and MxEN/DIAG pins.
MxINA
FLOATING
Motor direction input A (“clockwise” input).
MxINB
FLOATING
Motor direction input B (“counterclockwise” input).
MxCS
Current sense output. The pin voltage is roughly 140 mV per amp of output current
when the CS_DIS pin is low or disconnected. The current sense reading is more
accurate at higher currents. (Note that while the CS voltage can potentially exceed
3.3 V at high currents, the current sense circuit should be safe for use with many
3.3V analog inputs. Most MCUs have integrated protection diodes that will clamp
the input voltage to a safe value, and since the CS circuit has a 10 kΩ resistor in
series with the output, only a few hundred microamps at most will flow through that
diode.)
MxEN/
DIAG
HIGH
Combination enable input/diagnostic output. When the driver is functioning
normally, this pin acts as an enable input, with a logical high enabling the motor
outputs and a logical low disabling motor outputs. When a driver fault occurs, the
IC drives this pin low and the motor outputs are disabled. Note that the VNH5019
actually has separate EN/DIAG pins for each half bridge (ENA/DIAGA and ENB/
DIAGB), but these are tied together on the board by default to create a single enable
input/diagnostic output for each driver. See
for information on how to
individually access ENA/DIAGA and ENB/DIAGB pins (this is typically not
necessary).
MxCS_DIS LOW
Disables the current sense output, MxCS, when high. Can be left disconnected in
most applications.
Pololu Dual VNH5019 Motor Driver Shield User’s Guide
© 2001–2014 Pololu Corporation
4. Using as a General-Purpose Motor Driver
Page 17 of 28