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PCB updates #85

Merged
merged 4 commits into from
Jun 17, 2022
Merged

PCB updates #85

merged 4 commits into from
Jun 17, 2022

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thejpster
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@thejpster thejpster commented Jun 16, 2022

Replace CPL parts with actual part numbers.

Also:

  • sets VGA DAC to 1k / 2k and adds ESD chip bypass bridges
  • replaces standby LDO with TO-92 and electrolytic output cap
  • replaces K7805 output caps with one 22uF

Closes: #83
Closes: #77
Closes: #51
Closes: #61

Replaced some CPL resistors. Partial fix for #83
Added bridges for VGA I2C if ESD chip not fitted. Closes #51
@thejpster thejpster changed the title Feature/remove cpl parts PCB updates Jun 17, 2022
Also revised the Neotron Pico symbol to put all the GPIO on one side
and all the GND at the bottom.

Closes: #61
The Holtek was a SOT-89 that had a completely different pinout to
every other SOT-89 3.3V LDO out there. To avoid confusion I
wanted to replace it, but the only other basic JLCPCB parts
were the AMS1117 (huge quiescent current) and something only
rated to 7V input voltage (this LDO gets the full VDC in).

So, I used a TO-92 footprint and picked an LP2950N.

This, however, needs some ESR on the output cap, so I made
that a 2.2uF electrolytic.

I also removed the 2x 10uF output caps on the K7805 and set
just one 22uF as specified in the datasheet.
@thejpster thejpster merged commit 85a0242 into develop Jun 17, 2022
@thejpster thejpster deleted the feature/remove-cpl-parts branch June 18, 2022 16:44
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Ditch the CPL Lower DAC resistors I2C pull-ups missing Fit TPD7S019 bypass pins
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