Datasheet

PmodHB3™ Reference Manual
Copyright Digilent, Inc. All rights reserved.
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Page 2 of 4
Enable pin. The more often that an enable pin is driven high within a set time frame, the faster the DC motor will
spin.
2KHz
2KHz
2KHz
3.3V * 10% = 0.33V
3.3V * 50% = 1.75V
3.3V * 75% = 2.48V
Figure 1
Figure 3
Figure 2
10%
90 %
Gnd
VCC
10% Duty
Cycle
75% Duty
Cycle
50% Duty
Cycle
Table 1. Frequency and corresponding rotation.
The way that this works is that when voltage is being applied, the motor is driven by the changing magnetic forces.
When voltage is stopped, momentum causes the motor to continue spinning a while. At a high enough frequency,
this process of powering and coasting enables the motor to achieve a smooth rotation that can easily be controlled
through digital logic.
Pin
Signal
Description
1
DIR
Direction pin
2
EN
Enable pin
3
SA
Sensor A feedback pin
4
SB
Sensor B feedback pin
5
GND
Power Supply Ground
6
VCC
Positive Power Supply (3.3/5V)
Table 1. Pinout description table.
H-BRIDGE
CIRCUIT
VM
DIR
EN
SA
SB
GND
VCC
GND
VCC
GND
GND
VM
J1
J2
J3
M+
M-
J5
Figure 2. PmodHB3 block diagram.
Any external power applied to the PmodHB3 must be within 2.7V and 5.25V; however, it is recommended that
Pmod is operated at 3.3V.