Cypress CYW943907AEVAL1F User Manual page 17

Kit Operation
Figure 3-3. Verifying Device Driver Installation
3.3.2 Troubleshooting
If an error occurs during the automatic driver installation process, the driver may be manually installed from the following
directory: <WICED-SDK>\Drivers\Windows\wiced_uart.
If the CYW943907AEVAL1F EVK does not appear in Device Manager, verify that the +3V3 LED (D2) is turned ON, and check
the USB cable.
3.3.3 External Power Supply
The CYW943907AEVAL1F EVK can be powered using an external power supply (5 V–12 V, 2A), using a 2.5-mm DC Jack
with the center pin positive. When using an external power supply and also connecting a USB cable (for
programming/debugging or USB-UART), the voltage on the external power supply must be greater than that of the USB
supply. If not, the kit will be actually sourcing its power from USB rather than the external power supply.
CYW943907AEVAL1F Evaluation Kit User Guide, Doc. No. 002-18703 Rev. *B 17