Difference between revisions of "Fx2grok"
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=== Cable === | === Cable and connector variants === | ||
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File:Fx2grok samtec cable finished.jpg|<small>Finished cable</small> | File:Fx2grok samtec cable finished.jpg|<small>Finished cable</small> | ||
File:Fx2grok samtec cable with probes.jpg|<small>Cable with probes</small> | File:Fx2grok samtec cable with probes.jpg|<small>Cable with probes</small> | ||
File:Fx2grok samtec cable tfm.jpg|<small>Samtec TFM-105-01-L-D</small> | |||
File:Fx2grok samtec cable tfm2.jpg|<small>Samtec TFM-105-01-L-D</small> | |||
File:Fx2grok_samtec_cable_connected.jpg|<small>Cable connected</small> | |||
File:Fx2grok samtec cable pinheader.jpg|<small>Cable + pinheader</small> | |||
</gallery> | </gallery> | ||
Revision as of 22:06, 14 September 2017
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 Open Hardware Cypress FX2 based 8-channel logic analyzer.
- Optional: Make a tiny 3D-printed enclosure, and/or an "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).
Status
Work in progress, untested, may or may not work!
First PCB, fx2grok-tiny 0.1, is finished and test boards are ordered. Whether or not everything works as planned is yet to be seen.
Hardware
- 13mm x 13mm PCB
- 0.8mm PCB thickness, 5mil traces, 6mil trace clearance, 8mil via drill hole diameter, 5mil annular ring.
- Double-sided 2-layer PCB/layout, 0402 SMD components soldered on both sides.
- USB micro-B connector.
- 1.27mm 5x2 pin header.
- FX2 in 56pin QFN package.
- Small SMD 24MHz crystal.
- No buffer or other input protection (not even 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, PCB layout and Gerber files are available from the fx2grok git repository:
$ git clone git://sigrok.org/fx2grok
Photos
Schematics, PCB layout, 3D preview
Schematics
PCB layout
3D preview, top
3D preview, bottom
Cable and connector variants
Samtec SFSD-05-28-H-10.00-SR
Connector with notch
Crimp parts
Crimp
Finished cable
Cable with probes
Samtec TFM-105-01-L-D
Samtec TFM-105-01-L-D
Cable connected
Cable + pinheader
Bill of materials
Note: All prices are for single quantities, most parts get a lot cheaper if you buy higher quantities.
| Qty | Device | Footprint | Size | Value | Refdes | Digikey | Mouser | Comments |
|---|---|---|---|---|---|---|---|---|
| Required parts | ||||||||
| 1 | Cypress CY7C68013A-56LTXC | QFN-56 | 8mm x 8mm | — | IC1 | 10.05€ | 10.30€ | Main chip. Alternatives:
|
| 1 | Amphenol FCI 10118192-0001LF | custom | 9.8mm x 5.6mm | — | U1 | 0.38€ | 0.35€ | USB Micro-B SMD connector |
| 1 | Murata XRCGB24M000FAN00R0 | custom | 2mm x 1.6mm | 24MHz | Y1 | 0.29€ | 0.46€ | 24MHz crystal |
| 1 | Micrel MIC5504-3.3YM5-TR | SOT-23-5 | 2.9mm x 1.6mm | 3.3V | U2 | 0.10€ | 0.10€ | 3.3V LDO |
| 4 | Yageo RC0402JR-072R7L | 0402 | 0.25mm x 0.125mm | 2.7 kΩ | R2, R3, R4, R5 | 0.08€ | 0.08€ | Resistor |
| 1 | Samsung RC1005J104CS | 0402 | 0.25mm x 0.125mm | 100 kΩ | R1 | 0.08€ | — | Resistor |
| 8 | Samsung CL05A104KP5NNNC | 0402 | 0.25mm x 0.125mm | 100nF | C2, C5, C7, C8, C10-C13 | 0.08€ | — | Ceramic capacitor |
| 3 | Taiyo Yuden JMK105BJ105KV-F | 0402 | 0.25mm x 0.125mm | 1uF | C1, C14, C16 | 0.08€ | 0.10€ | Ceramic capacitor |
| 2 | Murata GRM155R61A225KE95D | 0402 | 0.25mm x 0.125mm | 2.2uF | C3, C6 | 0.08€ | 0.08€ | Ceramic capacitor |
| 2 | Samsung CL05C120JB5NNNC | 0402 | 0.25mm x 0.125mm | 12pF | C4, C9 | 0.08 | — | Ceramic capacitor |
| 1 | Vishay VLMB1500-GS08 | 0402 | 0.25mm x 0.125mm | — | D1 | 0.34€ | 0.51€ | LED |
| Optional parts / variants | ||||||||
| 1 | Amphenol FCI 20021111-00010T4LF | custom | — | — | P1/P2 | 0.53€ | 0.55€ | 5x2 through-hole pin header (1.27mm pitch), could soldered to the PCB (5 pins per side) |
| 1 | Amphenol FCI 20021311-00010T4LF | custom | — | — | — | 0.68€ | 0.69€ | 5x2 connector/receptacle (1.27mm pitch), could be used for soldering the probe cable/wires |
| 1 | Samtec TFM-105-01-L-D | custom | — | — | P1/P2 | 0.53€ | — | 5x2 through-hole pin header (1.27mm pitch) with a notch, soldered to the PCB (5 pins per side), match for the Samtec SFSD-05-28-H-10.00-SR cable below |
| 1 | Samtec SFSD-05-28-H-10.00-SR | custom | — | — | — | 4.77€ | — | Potential probe cable, needs some crimping |
Note: C15 is missing and there is a C16, which is correct. C15 was removed and the numbering wasn't reset.