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1300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com 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. Page 1 of 2 Pmod8LD™ Reference Manual Header J1 Pin Signal Description 1 LD0 LED 0 2 LD1 LED 1 3 LD2 LED 2 4 LD3 LED 3 5 GND Power Supply Ground 6 VCC Power Supply (3.3/5V) P4 7 LD4 LED 4 GND 8 LD5 LED 5 9 LD6 LED 6 10 LD7 LED 7 11 GND Power Supply Ground 12 VCC Power Supply (3.3/5V) P1 P2 J1 Connector P3 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. Page 2 of 2