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Cypress CY3640 USB Starter Kit
User’s Guide
Cypress Semiconductor Ver 0.993
Page 12
USB. These beads should not be necessarily and are provided for exceptional noisy
environments.
The locations are shorted by a trace on the bottom layer of the PC board. If you desire to use
ferrite beads, you should cut the traces and install beads suitable to your needs.
Other items of interest
Bulk capacitor bleeder resistor (R5)
A resistor is provided to bleed off the charge stored on the bulk capacitor. This is provided to
insure that charge is removed from the bulk capacitor and hence the board logic, within a
short period after the device is unplugged from the USB.
USB connector
A “B” receptacle has been provided on the board so a detachable A/B cable can be used with
the device.
A footprint for an in-line connector (P2) to a permanently attached USB cable has been
provided if you need to have a non-removable USB cable.