Neotron-Compute / Neotron-Pico - History

Merge pull request #86 from Neotron-Compute/change-battery-holder

Swap to an Adam Tech battery holder.

Swap to an Adam Tech battery holder.

Pretty sure it'll just fit on the Keystone 103 footprint so
I didn't change it.

Merge pull request #85 from Neotron-Compute/feature/remove-cpl-parts

PCB updates

Removed all CPL parts, and changed standby PSU.

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.

Add I2C pull-ups.

Also revised the Neotron Pico symbol to put all the GPIO on one side
and all the GND at the bottom.

Closes: #61

Set DAC to 1k/2k. Closes #77
Replaced some CPL resistors. Partial fix for #83
Added bridges for VGA I2C if ESD chip not fitted. Closes #51

Merge pull request #80 from Neotron-Compute/feature/replace-rtc

Feature/replace rtc

Change RTC to DS1307.

It's a SOIC-8 and there's a few other parts that will fit. It also
needs no load capacitors on the crystal.

The PCB change includes a slight tidy-up of the CODEC 3.3V line, and
I moved the SPI lines into the BMC apart.