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1300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodOC1™ Reference Manual Revised April 12, 2016 This manual applies to the PmodOC1 rev. C Overview The Digilent PmodOC1 uses open-collector BJT's to drive high current applications. Features include:       Four 100mA (200mA max) MMBT3904 transistors Four output clamp diodes 40V voltage threshold Small PCB size for flexible designs 1.0“ × 0.8” (2.54 cm × 2.0 cm) 6-pin Pmod port with GPIO interface Follows Digilent Pmod Interface Specification Type 1 The PmodOC1. 1 Functional Description The PmodOC1 utilizes MMBT3904 transistors in an open collector format. Each transistor can drive up to 100 mA of current individually and can draw up to 200 mA of current. 2 Interfacing with the Pmod The Pmod communicates with the host board via the GPIO protocol. A logic level high voltage will “turn on” the BJT and a logic low signal will keep the BJT “off”. DOC#: 530-062 Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners. Page 1 of 2 PmodOC1™ Reference Manual Pin 1 2 3 4 5 6 Signal P1 P2 P3 P4 GND VCC Description Output 1 Output 2 Output 3 Output 4 Power Supply Ground Positive Power Supply Table 1. Pinout description table. Any external power applied to the PmodOC1 must be within 2.7V and 5.25V; however, it is recommended that Pmod is operated at 3.3V. 3 Physical Dimensions The pins on the pin header are spaced 100 mil apart. The PCB is 1 inch 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