The fx2grok family consists of four devices (fx2grok-flat, fx2grok-tiny, fx2grok-bga, fx2grok-wide) of very small, Open Hardware FX2-based logic analyzers.
Using the open-source fx2lafw firmware (and sigrok, of course) you can use these devices as 8-channel(Or 16-channel, for the fx2grok-wide) logic analyzers.
Note: All of this is work in progress and might change at any time!
|Author||Piotr Esden-Tempski||Uwe Hermann||Uwe Hermann||Ryan "Izzy" Bales, based off of Piotr Esden-Tempski's fx2grok-flat|
|Hardware license||CC-BY-SA 4.0||CC-BY-SA 3.0 1||CC-BY-SA 4.0||CC-BY-SA 4.0|
|Size||33mm x 16mm||13mm x 13mm||tbd||tbd|
|Logic channels||8 + CLK & TRIG||8||tbd||16|
|Cypress FX2||Cypress CY7C68013A-56LTXC, QFN, 8mm x 8mm||Cypress CY7C68013A-56LTXC, QFN, 8mm x 8mm||Cypress CY7C68013A-56BAXC, BGA, 5mm x 5mm||Cypress CY7C68013A-56LTXC, QFN, 8mm x 8mm|
|Input protection||3 x IP425x-4-TTL EMI/ESD filters on all probes + 100k pull-ups, 1x USBLC6-2 for USB||None whatsoever||None whatsoever||100Ω on each probe, 4x DSILC6-4 for all probes, 1x USBLC6-2 for USB|
|USB connector||USB Micro-B SMD||USB Micro-B SMD||tbd||USB Micro-B SMD|
|Probe connector||2x6 1.27mm PCB-edge connector||2x5 1.27mm PCB-edge connector||tbd||2x 2x5 1.27mm PCB-edge connectors|
|EEPROM||Yes, sigrok fx2lafw (8-channel) VID/PID 1d50:608c||None, default Cypress VID/PID 04b4:8613||None, default Cypress VID/PID 04b4:8613||Yes, sigrok fx2lafw (16-channel) VIP/PID 1d50:608d|
|Passives||Mostly 0402, some 0603 & 0.4mm pitch DFN||Only 0402||tbd||Mostly 0402, some 0603|
|LED||1x 0603 LED on PA1||1x 0402 LED on PA1||tbd||1x 0603 LED on PA1|
1 Historical reasons.
2 Optional goal: 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).
Work in progress, untested, may or may not work!
The first PCB, fx2grok-tiny 0.1, has been found to be non-working. A fixed 0.2 version is currently being worked on.
The schematics, PCB layout and Gerber files are available from the fx2grok git repository:
$ git clone git://sigrok.org/fx2grok
Schematics, PCB layout, 3D preview
Cable and connector variants
Samtec SFSD-05-28-H-10.00-SR + TFM-105-01-L-D:
Hand-soldered ribbon cable:
Bill of materials
Note: All prices are for single quantities, most parts get a lot cheaper if you buy higher quantities.
|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.
- Cypress FX2 overview page
- CY7C68013A, CY7C68014A, CY7C68015A, CY7C68016A datasheet (PDF)
- EZ-USB Technical Reference Manual (TRM) (PDF)
- AN15456 - Guide to a Successful EZ-USB FX2LP Hardware Design (PDF)
- esden's series of videos on the fx2grok-flat design (schematics, PCB, with background information and almost a KiCad tutorial)
- esden's GitHub repository with the KiCad project files for the fx2grok-flat(In the "flat" branch)
- Ryan's GitHub repository with the KiCad project files for the fx2grok-wide(In the "wide" branch)