[adamapell]

Description

Addresses #1264

Motivation and Context

The MEGA2560 is underpowered and not capable of running the full backlight system with expected stability and performance.

Type of change

• [ x] ECAD - Revision (Revision of a PCB or the interconnect)

How Has This Been Tested?

I have run a physical production run to validate the the circuit redesign.

The GIGA Shield is a direct fit replacement as the GIGA follows the MEGA footprint. Also, this shield is compatible with the MEGA for those that do not wish to upgrade the hardware at this time.

Bus transceivers with Level Shift have been added to support the GIGA in addition to the MEGA platform.

Damping resistors have been added immediately after the Bus Transceivers to remove the ringing that occurs from the 800khz switching on the LED datalines.

Screenshots:

Before:


Orange - Raw MCU output
Cyan - Molex Output
Purple - Repeated output after pixel 35

After:




Orange - Raw MCU output
Cyan - Molex Output
Purple - Repeated output after pixel 35

Checklist: (Delete non-relevant sections)

PCB/ECAD:

• [ x] Requirements definition completed as a note on the schematic?
• [x ] Schematic completed?
• [ x] PCB laid out?
• [ x] PCB routed?
• [ x] PCB constrained by physical footprint limitations?
• [x ] PCB critical component location requirements met?
• [ x] Version number updated on PCB silkscreen, and the PCB and schematic docs?
• [ x] Schematic/PCB reviewed?
• [x ] BOM generated?
• [ x] Gerbers generated?
• [ x] MCAD generated?
• [ x] Has the fabrication files and a PDF of the schematic been copied to the ECAD folder of the release folder?

[Benny927]

The BOM has the resistors listed as all the same part number.