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pmod:pmodoc1:reference-manual [2022/09/13 17:17] – changed forum.digilentinc.com to forum.digilent.com jeff.greenberg_ni.compmod:pmodoc1:reference-manual [2022/10/04 11:38] (current) – external edit 127.0.0.1
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 +====== Pmod OC1 Reference Manual ======
 +The Digilent Pmod OC1 (Revision C) uses open-collector BJTs to drive high current applications.
  
 +{{Digilent Image Gallery 
 +| image = {{:reference:pmod:pmodoc1:pmodoc1-0.png?direct |}}
 +| image = {{:reference:pmod:pmodoc1:pmodoc1-1.png?direct |}}
 +| image = {{:reference:pmod:pmodoc1:pmodoc1-2.png?direct |}}
 +| image = {{:reference:pmod:pmodoc1:pmodoc1-3.png?direct |}}
 +}} 
 +
 +== Download This Reference Manual == 
 +  * {{:reference:pmod:pmodoc1:pmodoc1_rm.pdf| PDF}}
 +
 +----
 +
 +===== Features =====
 +  * Four 100mA (200mA max) transistors
 +  * Four output clamp diodes 
 +  * 40V voltage threshold 
 +  * 6-pin Pmod port with %%GPIO%% interface
 +
 +
 +----
 +=====Functional Description =====
 +The %%Pmod OC1%% utilizes [[http://www.nxp.com/documents/data_sheet/MMBT3904.pdf|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. 
 +
 +----
 +===== Interfacing with the Pmod=====
 +The %%Pmod%% communicates with the host board via the [[pmod:communication_protocols:gpio|GPIO protocol]]. A logic level high voltage will "turn on" the BJT and a logic low signal will keep the BJT "off". 
 +
 +
 +==== Pinout Description Table ====
 +^  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  |
 +
 +Any external power applied to the %%Pmod OC1%% must be within 2.7V and 5.25V; however, it is recommended that Pmod is operated at 3.3V.
 +
 +----
 +===== 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.
 +
 +----
 +===== Additional Information =====
 +The schematics of the %%Pmod OC1%% are available {{reference:pmod:pmodoc1:pmodoc1_sch.pdf|here}}. Additional information about the BJTs including specific timings of the chip can be found by checking out its datasheet [[http://www.nxp.com/documents/data_sheet/MMBT3904.pdf|here]]. 
 +
 +Example code demonstrating how to get information from the %%Pmod OC1%% can be found [[pmod:pmodoc1:start#example_projects|here]]. 
 +
 +If you have any questions or comments about the %%Pmod OC1%%, feel free to post them under the appropriate section ("Add-on Boards") of the [[https://forum.digilentinc.com/|Digilent Forum]].