Introduction

This page contains the (relatively unchanging) information about v1.0 of the SARduino644 board.

SARduino 644 v1.0

Updates

This revision was created to address the errata from v0.1, as follows:

• The reference designators were corrected and gaps removed.
• We labeled as many passives as we could.
• We separated the breakout area from the microcontroller pins, for more flexibility in how to use the breakout area.
• We added additional breakout for the FTDI cable input, as well as a simple auto-reset circuit and selection jumper.
• We slipped in extra power and ground rails wherever there was space.
• We added breakout space for raw VIN, safe VIN, and VCC in.
• We repositioned the bypass caps, and added pads for optional 805 bypass caps as an alternative.

We are very happy with how the improved prototyping area turned out, and the auto-reset circuit has proved its worth already.

Design Files

Because we had this round made as a 2-board panel on a 10cm x 10cm board from Seeed, we’ve included the panelized gerbers, along with the single-board gerbers we used to construct the panel.  If you order a board, don’t be surprised to see the edge where the panel was separated, though it should be a clean cut.

Bill of Materials

Here is a Mouser BOM of all the parts listed below, for easy ordering.

Errata

• The silkscreen, especially on the reverse side of the boards, is a bit smudged.  Some of it is hard to read because it is so tiny, in other cases, I think it’s the smudging.  That’s just how they came from Seeed, I’ll make an inquiry, but I don’t expect much to come from it.  In the future, maybe cut down the line width, and increase the text size, where possible.
• Some of the labels for the bypass caps are hidden beneath the socket.  I did this on purpose, but now I’m having second thoughts.
• The FTDI connector, the external power jack, and the voltage regulator need to be labeled on the silkscreen.
• An (optional) power LED circuit would be nice.
• The power supply filter caps and the voltage regulator, when placed, make accessing the SC-70 breakout very difficult.  If you intend to use that breakout, please consider populating it before the power supply circuit.
• None of the vias are tented, we’ll have to see if there’s some way to do that.  Maybe the vias were too large.