C8051T620/2-DK
14 Rev. 0.4
Table2 lists the port pins and headers corresponding to the switches, LEDs, and potentiometer.
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 Figure12. 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.

Figure 12.J6 and J7 Shorting Block Configuration for Power Options

Table 2. Motherboard I/O Descriptions

Description Component Name I/O Header
Switch SW1 Daughter Card's P0.1
Daughter Card’s P2.0 J9 [2-4]
J9 [4-6]
Switch SW2 Daughter Card’s P1.0
Daughter Card’s P2.1 J9 [1-3]
J9 [3-5]
RESET SW3 Daughter Card's RST/C2CK None
Green LED labeled “LED1” D1 Daughter Card's P0.6
Daughter Card's P2.2 J10 [2-4]
J10 [4-6]
Green LED labeled “LED2” D2 Daughter Card’s P1.2
Daughter Card's P2.3 J10 [1-3]
J10 [3-5]
Red LED labeled “PWR” D4 Daughter Card's VDD J6, J7
Red LED labeled “VPP” D7 Daughter Card's VPP pin
(See "VPP Pin Sharing" on
page 16)
J15
Green LED labeled “RUN” D10 Debug Adapter Signal None
Red LED labeled “STOP” D11 Debug Adapter Signal None
Orange LED labeled “DEBUG PWR” D12 Debug Adapter Signal None
Green LED labeled “USB ACTIVE” D13 U2 CP2103's SUSPEND None
Potentiometer R8 Daughter Card's P2.5 J12
J7
J6
VDD_PWR
+3VD
VDD_EXT
VDD_DEBUG
VDD_COMM
J7
J6
VDD_PWR
+3VD
VDD_EXT
VDD_DEBUG
VDD_COMM
J7
J6
VDD_PWR
+3VD
VDD_EXT
VDD_DEBUG
VDD_COMM
J7
J6
VDD_PWR
+3VD
VDD_EXT
VDD_DEBUG
VDD_COMM
+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)
VDD_PWR VDD_PWRVDD_PWRVDD_PWRVDD_T620 VDD_T620 VDD_T620 VDD_T620