FLASH-CAN-48P
Chapter 3 Jumpers and Switches
UG-900002-20
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© Fujitsu Semiconductor Europe GmbH
3.3 Power Supply Voltage
(JP: 29, 34)
Vcc and GND (Vss) are both connected to the edge-connector (X4) in order to supply
additional circuitry. In this case take care of not to exceed the maximum ratings of the on
board voltage regulator LM317T.
JP29
Power Supply selection
JP30
Power Supply voltage selection: +5V or +3.3V
JP34
This Jumper is used to connect the Vcc supply voltage to the µC.
Connecting an Ampere-meter instead of the jumper allows measuring of the power-
supply-current of the microcontroller (Icc).
Jumper
Setting
Description
JP29 (Vcc)
1 - 2
On-board voltage regulation
2 - 3
not supported
JP30 (3V3)
ON (closed)
voltage regulation adjusted to +3.3V
OFF (open)
voltage regulation adjusted to +5V
JP34 (MCUVcc)
ON (closed)
Power supply Vcc is connected to µC
OFF (open)
Disconnected from Power supply Vcc
Default: JP29 = 1-2, JP30 = OFF, JP34 = ON,
By default, the on-board V5V regulation is used and the microcontroller is powered.
