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Old 08-12-2013, 10:36 PM
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John John is offline
Join Date: Jan 2009
Posts: 3,007
Default MSA-P, MSA-R, MSA-T Output Schematics

Here is the schematic for a single output of a Rev K MSA-P:

Here is the schematic for a single output of a Rev K MSA-R:

And here is the schematic for a single output of a Rev K MSA-T:

This will be useful for anyone wanting to hack the outputs of the MSA.

The PIC16F87 microcontroller on the Rev K MSA can supply up to 25mA from a single pin or up to 200mA in aggregate from all pins.

The MSA-R is designed so that the PIC will supply around 16mA from a single pin and about 128mA total from the output drive pins when all 8 MSA outputs are "on". (12mA / 96mA for MSA-P.) This leaves plenty of current capacity for other functions of the PIC like running code and driving the ACT LED.

I recommend limiting the current draw to 20mA from any of the 8 output drive pins of the PIC.

Last edited by John; 08-14-2013 at 03:19 PM.
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Old 02-27-2014, 12:16 PM
Archangel Archangel is offline
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Join Date: Apr 2012
Posts: 10

Very cool!
Thanks for that John!
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