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PmodOC1™ Reference Manual
Revised April 12, 2016
This manual applies to the PmodOC1 rev. C
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Overview
The Digilent PmodOC1 uses open-collector BJT's to drive high current applications.
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”.
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
