Renesas R0K5R8C34DK2HBR, Hardware Instruction Manual

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R8C/34K Group USB Host Evaluation Board R0K5R8C34DK2HBR
Hardware Instruction Manual
R01AN0649EJ0110 Rev.1.10 Page 12 of 26
Jul 21, 2011
JP1 (
Figure 3
) selects the main power supply source for components that can run on either 3.3V or 5V, such as the
MCU, user LED, user switch, and RS232C transceiver. The supply source can be selected from the following: (1)
stabilized power supply (DC), (2) E8a supply source (E8a).
[Notice] Don’t select “VBUS” on JP1.
When using the stabilized power supply, supply power through CN7 (
Figure 4
). The red line of the attached power
cable is connected to the power line (+) and the black line is connected to the ground (-) of the stabilized power supply.
If you need to use an AC adaptor, remove the CN7 connector and mount the connector to CN8 shown in No 14 of the
Appendix 3 “Parts List”. Select the AC adaptor with “center plus”.
Mounting AC adapter connector is at your own risk.
Be careful to check the polarity of the power supply and the supply voltage.
JP2 (
Figure 5
) selects the power supply source for components that can only run on 5V, such as the LCD module, the
buffer IC for LCD and Host VBUS control IC. Supply sources can be selected from (1) internal input (direct from main
power supply) and (2) external input. When the main power supply voltage is 3.3V or the power supply source is from
E8a, supply additional power (5V) from external input TP1.
[Notice] When supplying external 5V to TP1 terminal, you must supply the power to TP1 prior to the main power
supply to CN7.
.
JP3 (
Figure 6
) switches the VBUS power of the VBUS pin in the USB receptacle. Leave it fixed to “Host” position.
JP4 (
Figure 7
) switches the power supply to the MCU built-in USB module. Set it according to the main power supply
voltage range. In addition, the VDDUSBE bit of the USBMC resistor in the MCU must be selected shown as Table 5.
Table 5
The combination of the JP4 and the VDDUSBE bit by the main power supply voltage range
Voltage Range JP4 setting VDDUSBE bit
4.7V- 5.5V “Open” (
Figure 7
Power supply “OFF”) “1” (Enables internal regulator for USB)
3.0V - 3.6V “Short” (
Figure 7
Power supply “ON”) “0” (Connects main power supply to USB)
Do NOT leave JP4 to "short", when the voltage range of main power supply is from 4.7V to 5.5V.