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Pmod8LD™ Reference Manual
Revised April 15, 2016
This manual applies to the Pmod8LD rev. B
Overview
The Digilent Pmod8LD has eight high-bright LEDs that are driven by logic-level transistors so that each LED can be
individually illuminated from a logic high signal.
Features include:
Eight high brightness green LEDs
BJTs for low-power logic level control
Small PCB size for flexible designs 1.1 in × 0.8 in (2.8 cm × 2.0
cm)
2×6-pin Pmod port with GPIO interface
The Pmod8LD.
1
Functional Description
The Pmod8LD utilizes individual transistors so that each LED can be turned on or off independently. In order to
active an LED, the associated pin on the pin header must receive about 1mA of current.
2
Interfacing with the Pmod
The Pmod8LD communicates with the host board via GPIO pins. Correspondingly, to turn a particular LED on, the
pin must be driven to a logic high state and driven to a logic low state to turn a LED off. With the parallel
arrangement of these LEDs it is possible to turn on (or off) multiple LEDs simultaneously.
A pin description and diagram are provided below.
DOC#: 502-163
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
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Pmod8LD™ Reference Manual
Header J1
Pin
1
2
3
4
5
6
7
8
9
10
11
12
Signal
LD0
LD1
LD2
LD3
GND
VCC
LD4
LD5
LD6
LD7
GND
VCC
Description
LED 0
LED 1
LED 2
LED 3
Power Supply Ground
Power Supply (3.3/5V)
LED 4
P1
P2
P3
P4
GND
LED 6
LED 7
Power Supply Ground
Power Supply (3.3/5V)
J1 Connector
LED 5
Vcc
P7
P8
Table 1. Pinout description table.
P9
P10
GND
Vcc
Figure 1. Pmod8LD module circuit diagram.
3
Physical Dimensions
The pins on the pin header are spaced 100 mil apart. The PCB is 1.1 inches long on the sides parallel to the pins on
the pin header and 0.8 inches long on the sides perpendicular to the pin header.
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
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