Digilent 6021-210-000P-KIT - Manual (Page 15)

Universal Development Board™ Reference Manual
Copyright Digilent, Inc. All rights reserved.
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Page 15 of 27
SC
L
SD
A
SC
L
SD
A
Pull-ups
Enabled Pull-ups
Disabled
3V
3
G
N
D
3V
3
G
N
D
Figure 1 Jumper Settings for I2C Pull-ups
9 Pmod Interface
The UDB board provides two Pmod connectors for use with Pmod peripheral modules. Pmods are a line of small
peripheral interface modules available from Digilent. The range of available Pmod peripheral modules include
various connectors; sensors such as accelerometers and gyroscopes; a wide variety of A/D and D/A converters;
input/output devices such as buttons, switches, LEDs, LCD display, and OLED graphics displays; h-bridge and open
drain FET modules for controlling motors and solenoids; and communications modules such as WiFi and BlueTooth
interface modules.
The Pmod modules can plug directly into the Pmod connector, or can be connected via six-pin or twelve-pin cables.
Two six pin peripheral modules can be connected to a single 12-pin connector via a twelve-pin to dual six-pin
splitter cable. Pmod peripheral modules are powered by the UDB via the interface’s power and ground pins.
There are two 12-pin Pmod connectors on the UDB, labeled JA and JB. Each Pmod connector provides eight I/O
signal pins, two power pins, and two ground pins. The signals are arranged so that the connector provides either a
single 12-pin interface or two stacked 6-pin interfaces on each Pmod connector.
The pin numbering that Digilent uses on the 12-pin Pmod connectors is non-standard. The upper row of pins are
numbered 1–6, right to left (when viewed from the end of the connector), and the lower row of pins are numbered
7–12, right to left. This is in keeping with the convention that the upper and lower rows of pins can be considered
to be two six-pin connectors stacked. When viewed from the end of the connector, pin 1 is the upper right pin and
pin 7 is immediately below it (closer to the PCB).
Pin 1
Pin 12
Pin 6
8 signals VCC GND
Figure 2 PMOD connectors Front view
The Pmod connectors are wired to locations on the PIM bus. They can be accessed directly from either the
microcontroller on a PIM module or the on-board PIC32MX360. To use the Pmod connectors from a
microcontroller in one of the DIP sockets, it is necessary to use jumper wires to make the signal connections from
the DIP bus header to the PIM bus headers.