FreeDSP-FreeUSBi_Programmer_hybrid_version

FreeUSBi

This is another PCB layout design of FreeUSBi.
Component Layout had changed, Voltage-shifter design changed, selectable parts type capability (SMD or TH) Please see the images in the “Photo” directory for differences.

Issue found on some CY7C68013A boards.

Some CY7C68013A boards can not boot when connected to a FreeUSBi board. The reason is that the SDA line of the I2C bus voltage dropped during the boot sequence. The Voltage-Shifter circuit control line and I2C pull-up circuit were not tied to 3.3V because the uP has not run yet. So, the version 0.5 design connects them to a regulated 3.3V line. According to this change, the I2C line is pulled up to 3.3V anytime a USB is connected.

For Windows 10 users, Info:

Some machines were not able to run the official FreeUSBi driver.
But a few machines have succeeded in installing & running with the 3eAudio version FreeUSBi driver (Located at https://www.3e-audio.com/dsp/adau1701-2in4out/)

License

This work and all other materials under https://github.com/freeDSP are licensed under a Creative Commons Attribution Share-Alike 4.0 license. This allows for both personal and commercial derivative works, as long as they credit freeDSP and release their designs under the same license.