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3.2 Power Supply (S3, JP: 8, 9, 11, 12, 66)
The onboard voltage regulators provide stabilized 5V and 3.3V supplies to the MCU and
peripherals. Even though they are thermally protected against overload, care must be taken
when supplying current for additional circuitry.
The LIN Vs line can be connected directly to the input supply of the board by Jumpers. In
this case, the input voltage to the board has to be suitable for the connected bus devices
(mostly around 12V). Since there is a protection diode between Vin and Vs, it is not possible
to power the board over the LIN bus.
Power Switch
S3
Selects the MCU External Bus voltage VDD35 (3.3V or 5V)
JP8
Connects the MCU IO voltage to Vcc. Can be used for current measurement.
JP9
JP11 Selects the MCU IO and peripherals Vcc voltage (3.3V or 5V)
JP12 Selects the MCU core voltage regulator input voltage (3.3V or 5V)
JP66 Mains jumper; overrides the power switch S3.
Switch
S3
Jumper
JP8
(VDD35 3V/5V)
JP9
(VDD5)
JP11
(VDD5 3V/5V)
JP12
(VDD5R)
JP30, 31, 56, 57
(VBAT)
JP66
(Mains)
By default, I/O supply and MCU Core are set to 5V and the external bus I/F is set to 3.3 V.
© Fujitsu Microelectronics Europe GmbH
SK-91460T-144PMC-GPIO User Guide
Chapter 3 Jumpers and Switches
Setting
Description
ON (1-2)
Power ON
OFF (2-3)
Power OFF
Table 3-2: Power Switch
Setting
Description
1 - 2
External Bus @ 5V
2 - 3
External Bus @ 3.3V
Closed
Power supply Vcc connected to VDD5
Open
Power supply Vcc not connected to VDD5
1 - 2
MCU IO / Peripherals @ 5V
2 - 3
MCU IO / Peripherals @ 3.3V
1 - 2
Supply to MCU Core voltage regulator is 5V
2 - 3
Supply to MCU Core voltage regulator is 3.3V
Closed
Vs (Pin1) of LIN connector is powered by the board
Open
No voltage supply to Vs of LIN A
Closed
Board is always on
Open
S3 switches the Board on and off
Table 3-3: Power Supply Configuration
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FMEMCU-UG-910074-11
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