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Note : If an extra COM port is not available after installing the CDM drivers, connect the
DLP-USB232R and open Control Panel>System>Device Manager. Right click on USB
Serial Converter under USB Controllers and select Properties, then the Advanced tab.
Check the box marked Load VCP, and then click OK. Unplug and re-plug the
DLP-USB232R, and a COM port will be added. [This method is also used to convert from
VCP drivers to the D2XX (DLL) drivers.]
2.0 DEVICE CONFIGURATION EXAMPLES
USB Bus-Powered and Self-Powered Configurations
Figure 1.
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8
9
Bus-Powered
5V System
The figure above illustrates a typical USB bus-powered configuration. A USB bus-powered
device gets its power from the USB bus. Basic rules for USB bus-powered devices are as
follows:
1. On plug-in to USB, the module and external circuitry should draw no more than 100mA on
the 5-volt line from the USB host.
2. In USB Suspend Mode, the module and external circuitry should draw no more than 2.5mA.
3. A bus-powered, high-power USB device (one that draws more than 100mA) should use one
of the CBUS pins configured as PWREN# to keep the current below 100mA on plug-in and
below 2.5mA on USB Suspend.
4. A design that consumes more than 100mA in total cannot be plugged into a USB
bus-powered hub.
5. No USB target system can draw more than 500mA from the USB bus. The power descriptors
in the internal EEPROM of the FT232R should be programmed to match the total current drawn
by the target system.
Note : If using PWREN# (available using the CBUS), the I/O pin should be pulled to VCCIO
using a 10k-ohm resistor.
Rev. 1.0 (November 2008)
7
? DLP Design, Inc.
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