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Thursday, June 30, 2011

Audio USB-FX2 USB-2.0 interface board circuit
schematic

Labels: audio >> circuits >> schematics >> USB Circuits

USB-FX2 USB-2.0 interface board circuit schematic

There are some things one should be aware of when building the design
above:

Resonator: According to the data sheet, the FX2LP has an on-chip
oscillator circuit which requires an external 24MHz (±100ppm) parallel
resonant, fundamental mode crystal with 500uW drive level and 12pF (5%
tolerance) load capacitors. So, you can't just put any 24MHz crystal there
but things don't seem to be as critical as one may expect. I'm using a 24MHz
fundamental mode crystal (24-MA505 from Reichelt) with 10..15pF caps (or even
32pF).
(Note: In the schematic above, there are 2 crystal
oscillators in parallel merely to have both options on the PCB (one of them
is an SMD). Only one of them is actually soldered onto the board.)

EEPROM: You can use an optional serial EEPROM to store either USB
configuration data or a complete program which is loaded into the
microcontroller's RAM at startup. You can leave it away completely to use
default USB config data and download firmware via the USB (thereby also
changing, the config data, it's the so-called ReNumeration thingy). Note,
however, that if you leave away the EEPROM, you must still put in both the
2.2k I2C bus pull-up resistors.

PWR_SEL: For USB-powered
operation (500mA max), close a jumper between pins 2 and 3, for externally
powered operation, apply 5V and GND to pins 2 and 1, respectively. There is
an additional 5V, 3.3V and GND power connector called PWR_HUB
to connect with add-on boards.

For 5V-to-3.3V conversion, you need to use an LDO (low-dropout
regulator) like the LM2937. It should have a drop-out of 1.2V max since the
USB specs allow the 5V voltage to be as low as 4.5V on the slave side.

Of course, usual voodoo applies like putting decoupling caps
near by and keeping the USB data lines short. A massive ground plane is
mandatory, at least for the analog half. Forget about Cypress telling you
that you need at least a 4-layer PCB. My regular 2-layer PCB (ground plane
on bottom) works stable in high-speed mode even with 3m USB cable.

Source : www.triplespark.net

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