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OmniFi DMS1 PCB Photos
Posted on Sunday, April 24 @ 04:02:31 PDT by lincomatic
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I found my T-6 torx driver tonite and cracked open my DMS1. Here are photos of the main PCB...
I took photos only of the PCB's since there are other shots of the interior in the Photos section at the Yahoo!Omnifi group. Thanks to Chad for tracing the various interesting connections.
DMS-1 Main PCB - Top View
Interesting stuff: 1) unpopulated pads for SW2 (top left to the right of the black tape) 2) 5-pin header J3 on right edge.
J3 pinouts:
Top:
1 - N/C
2 - N/C
3 - EP7312 Pin 32 - TXD[1]
4 - EP7312 Pin 36 - RXD[1]
5 - EP7312 Pin 155 - nMEDCHG/nBROM (Media Change Int / Boot Rom Selection)
Bottom:
1 - LED Blinker Output
2,3 - external fast interrupt input
4,5 - VSSIO/Ground
SW2: used to reset
the PIC, and hence resets the ARM as well. It is connected to ground
and to a 270Ohm resistor that is connected to the MCLR- (i.e. reset)
pin on the PIC. So if the SW2 pad were connected to a switch, that
switch would connect the reset line to the 270Ohm pulldown resistor.
DMS-1 Main PCB - Bottom View
Interesting stuff: 6-pin header J5 (inside the heavy white lined rounded off vertical rectangle).
J5 Pin -> PIC16FL872 Pin
1 -> 24 RB3/PGM - Port B IO / Low Voltage Program Enable
2 -> 27 RB6/PGC - Port B IO / Programming Clock
3 -> 28 RB7/PGD - Port B IO / Programming Data
4 -> 8,19 VSS - Ground
5 -> 20 VDD - Power (3.3 V)
6 -> 1 MCLR-/Vpp - Master Clear / Programming Voltage In/Out
Power Supply
5V +- 5% @ 2A
Control Panel PCB (rear)
If you want to see the full resolution 6MP photos, download them here: DMS1large.zip
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