Difference between revisions of "Fx2grok"

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== Bill of materials ==
== Bill of materials ==
(work in progress)


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|- valign="top"
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|| 9 || Capacitor || 0603 || — || 100nF || ... || ... || ... || ...
|| 9 || Ceramic Capacitor || 0603 || — || 100nF || ... || ... || ... || ...


|- valign="top"
|- valign="top"
|- bgcolor="#dddddd"
|- bgcolor="#dddddd"
|| 1 || Capacitor || 0603 || — || 1uF || ... || ... || ... || ...
|| 1 || Ceramic Capacitor || 0603 || — || 1uF || ... || ... || ... || ...


|- valign="top"
|- valign="top"
|- bgcolor="#eeeeee"
|- bgcolor="#eeeeee"
|| 3 || Capacitor || 0603 || — || 2.2uF || ... || ... || ... || ...
|| 3 || Ceramic Capacitor || 0603 || — || 2.2uF || ... || ... || ... || ...


|- valign="top"
|- valign="top"
|- bgcolor="#dddddd"
|- bgcolor="#dddddd"
|| 2 || Capacitor || 0603 || — || 12pF || ... || ... || ... || ...
|| 2 || Ceramic Capacitor || 0603 || — || 12pF || ... || ... || ... || ...
 
|- valign="top"
|- bgcolor="#eeeeee"
|| 3 || LED || 0603 || — || — || ... || ... || ... || ...


|}
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Revision as of 14:51, 3 June 2012

The fx2grok device is intended to be the tinyiest possible Open Hardware FX2 eval board (that can be used as 8-channel logic analyzer).

The schematics and layout are done from scratch in Kicad, and are released under the CC-BY-SA 3.0 license.

Using the open-source fx2lafw firmware (and sigrok, of course) you can use this device as 8-channel logic analyzer.

Goal

  • Make the tinyiest-possible FX2 eval board / logic analyzer.
  • Optional: Make a tiny "enclosure" using resin (example), with the device (including probes) ideally looking similar to the sigrok logo in the end.

What is NOT the goal?

As you may know, there are tons of FX2-based logic analyzers (and tons of clones) already. There's not much use in creating yet another "standard" device.

The goal of this little hobby project is thus NOT to make a better device, or to make a cheaper device, or anything like that. The only goal is to have it as tiny as possible (it's more of a "just for fun" project).

Hardware

  • Double-sided PCB/layout, SMD components soldered on both sides.
  • USB micro-B connector.
  • FX2 in 56pin QFN package.
  • Small SMD 24MHz crystal, or through-hole one with bent leads (less PCB space needed, but higher device).
  • No buffer or other protection, only 100 Ω resistors for each probe.
  • No EEPROM, the device will enumerate with the standard Cypress FX2 "unconfigured device" USB VID/PID (04b4:8613).

Download

The schematics and PCB layout is available from the fx2grok git repository:

$ git clone git://sigrok.git.sourceforge.net/gitroot/sigrok/fx2grok

Bill of materials

Qty Device Footprint Size Value Refdes Digikey Mouser Comments
1 Cypress CY7C68013A-56LTXC QFN-56 8mm x 8mm ... 10.07€ 12.00€ eBay: 4.04€ (but who knows if it's fake)
1 Hirose ZX62-B-5PA(11) custom 9.8mm x 5.6mm ... 0.98€ 0.908€ USB Micro-B connector
1 CTS 742C163101JP 2506 6.4mm x 1.6mm 100 Ω ... 0.50€ 0.124€ 8x resistor network (8x 0603), 100 Ω
1 Abracon ABM11-24.000MHZ-B7G-T custom 2mm x 1.6mm 24MHz ... 2.27€ 1.96€ 24MHz crystal
1 Micrel MIC5319-3.3YD5 SOT-23-5 2.9mm x 1.6mm 3.3V ... 1.89€ N/A 3.3V LDO
5 Resistor 0603 2.2 kΩ ... ... ... ...
2 Resistor 0603 100 Ω ... ... ... ...
9 Ceramic Capacitor 0603 100nF ... ... ... ...
1 Ceramic Capacitor 0603 1uF ... ... ... ...
3 Ceramic Capacitor 0603 2.2uF ... ... ... ...
2 Ceramic Capacitor 0603 12pF ... ... ... ...
3 LED 0603 ... ... ... ...

Resources