User's Manual

CY8CKIT-042-BLE-A Bluetooth® Low Energy (BLE) Pioneer Kit Guide, Doc. # 002-11468 Rev. *A 114

Hardware

5.3.1 Power System

The BLE Dongle is powered directly using 5 V from the USB port, as shown in Figure 5-28.

Figure 5-28. Power Supply Block Diagram With Protection Circuits

5.3.1.1 Protection Circuits

The PTC resettable fuse is connected to protect the computer's USB ports from shorts and overcur-

rent.

5.3.2 USB Type-A Plug

The KitProg on the BLE Dongle connects to the USB port of a computer through a USB Type-A plug

(Figure 5-29). The BLE Dongle is powered using the same plug. A resettable polyfuse is used to pro-

tect the computer's USB ports from shorts and overcurrent. If more than 500 mA is applied to the

USB port, the fuse will automatically break the connection until the short or overload is removed. The

VBUS, D+, and D– lines from the USB connector are also protected against ESD events using TVS

diodes.

Figure 5-29. Schematics and Board Highlight of USB Type-A Plug

USB

E S D

P ro tec tion

PRoC

PSoC5LP

Headers