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PmodOC1™ Reference Manual
Revised April 12, 2016
This manual applies to the PmodOC1 rev. C
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
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”.
The PmodOC1.
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
Features include:
PmodOC1™ Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 2 of 2
Pin
Signal
Description
1
P1
Output 1
2
P2
Output 2
3
P3
Output 3
4
P4
Output 4
5
GND
Power Supply Ground
6
VCC
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.
