User manual

Basys MX3™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
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Page 13 of 56
An external power supply can be used by plugging into Power Jack J11. The supply must use a coaxial, center-
positive 2.0 mm internal-diameter plug, and provide a voltage of 5V DC (4.75V minimum, 5.5V maximum). The
supply should provide a minimum current of 2A if servos are to be used. Ideally, the supply should be capable of
provide 20 Watts of power (5V DC, 4A). Many suitable supplies can be purchased from Digilent or other catalog
vendors.
The onboard motor driver (Texas Instruments DRV8835) may be powered by a 5V supply connected to Power Jack
J11, or by an external supply (0V-11V) connected to pins 1 and 2 of Terminal Block J5. Jumper JP1 is used to select
which power source is used by the motor driver.
Table 2.1. Power rail characteristics.
3 User LEDs
Eight LEDs are provided, labeled LD0 – LD7 on the board (and LED0 – LED7 on the schematic), attached to eight
digital I/O pins. Controlling the LEDs is done by basic access to an output I/O pin. Read more details in the Digital
Inputs and Outputs section.
Figure 3.1 shows the way the LEDs are electrically connected on the Basys MX3.
Supply
Circuits
Device
Current (max/typical)
3.3V
(VCC3V3)
PIC32MX370, PMODs, and all
onboard peripherals
excluding the LCD backlight,
RGB LED, IrDA LED, Servos,
and Motors
IC10: Texas Instruments
LMR10515
1.5A/NA
3.3V
(DBG3V3)
Onboard Microchip
Programmer/Debugger
IC11: Texas Instruments
LP2985IM5-3.3
150mA/NA