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C8051T63x-DK
7.3. Power Supply Headers (J6 and J7)
The main power supply of the motherboard, which is used to power the daughter board, can be provided by either
the USB Debug Adapter ’s on-chip voltage regulator, the CP2103 USB-to-UART bridge’s on-chip voltage regulator,
P3 and its associated circuitry, or an external voltage applied to the VDD_EXT connection on J1. To select a power
supply, place a shorting block on J6 across the appropriate pin pair, as shown in Figure 7. To connect the main
power supply to an attached daughter board, place a shorting block across J7.
Notes:
1. Only one shorting block should be placed on J6 at a time.
2. To use the CP2103’s voltage regulator as the board's power supply, a USB cable must be connected to P4,
and the USB ACTIVE LED (D2) must be on.
3. To use the USB Debug Adapter ’s voltage regulator as the board's power supply, a USB cable must be
connected to P5, and the DEBUG PWR LED (D12) must be on.
J7
J6
J7
J6
J7
J6
J7
J6
+3VD
VDD_EXT
VDD_F326
VDD_CP2103
VDD_PWR
VDD_PWR
VDD_PWR
VDD_PWR
+3VD
VDD_EXT
VDD_F326
VDD_CP2103
VDD_PWR
VDD_PWR
VDD_PWR
VDD_PWR
+3VD
VDD_EXT
VDD_F326
VDD_CP2103
VDD_PWR
VDD_PWR
VDD_PWR
VDD_PWR
+3VD
VDD_EXT
VDD_F326
VDD_CP2103
VDD_PWR
VDD_PWR
VDD_PWR
VDD_PWR
+3.3V Regulator Power
(From P3)
CP2103 Regulator Power
(From USB at P4)
Debug Circuit Power
(From USB at P5)
External Power Source
(From J1 Connector)
Figure 7. J6 and J7 Shorting Block Configuration for Power Options
7.4. USB Debug Adapter (DEBUG/P5)
A Universal Serial Bus (USB) connector (P5) provides the onboard debug and programming interface. The debug/
programming MCU and associated circuitry are powered through the USB connector, which can also supply the
rest of the motherboard by routing the USB Debug Adapter's power through J6. The USB Debug Adapter also
provides a data communications interface that can be used when the debug adapter is not debugging or
programming a C8051T63x device.
7.5. UART to USB Communications Interfaces
The C8051T630 Motherboard provides UART to USB communications interfaces through both the CP2103 USB-
to-UART bridge device and the communications interface of the USB Debug Adapter.
The CP2103 bridge device connects to a PC through the USB connector labeled “COMM” (P4). This USB
connector supplies power to the CP2103 and can supply power to the rest of the motherboard by configuring J6
and J7 as shown in Figure 7. To use the CP2103 as a communications interface, the CP2103 Virtual COM Port
drivers must be installed on a PC.
The USB Debug Adapter's communications interface connects to a PC through P5. Access to the USB Debug
Adapter's communications interface is provided by the Windows program called “ToolStick Terminal”, which is
available for download for free from the Silicon Laboratories website. See the ToolStick Terminal help file for
information on how to use ToolStick Terminal.
7.6. Communications Interface Selector Headers (J10 and J8)
The C8051T630 Motherboard routes the C8051T63x's P0.4 (UART TX) and P0.5 (UART RX) to J10, where those
signals can be connected to either the CP2103 USB-To-UART bridge or the USB Debug Adapter. The
motherboard also allows the C8051T63x's P1.1 and P1.2 to be used as the UART control signals, CTS and RTS.
These two signals are routed to J8, where they can be connected to either the CP2103 or the USB Debug Adapter.
The jumper options for using either the CP2103 or the Debug Adapter circuit for UART communications can be
12
Rev. 0.1
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