SK-91465X-100PMC User Guide
Chapter 3 Jumpers and Switches
UG-910056-11
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© Fujitsu Microelectronics Europe GmbH
3.2 Power supply
The onboard voltage regulator (U9) 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 JP40 and
JP60. 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.
JP63 Selects the MCU IO and peripherals Vcc voltage (V_ALL = 3.3V or 5V)
JP64 Selects the MCU Core voltage regulator input voltage (3.3V / V_ALL)
JP52 Connects the Board voltage to V_ALL. Can be used for current measurement of
whole board.
JP55 Connects the MCU Io voltage (V_MCU) to V_ALL. Can be used for current
measurement of MCU.
JP25 Selects the Gate input voltage of MOSFET Q2 (Vin / INHx)
JP40 Connects Vs (Pin 1 of X8) to Vin
JP60 Connects Vs (Pin 1 of X12) to Vin
JP1
Selects Vcc of CAN A (Pin 3 of U2) (5V or V_ALL)
JP11 Selects Vcc of CAN B (Pin 3 of U4) (5V or V_ALL)
Jumper
Setting
Description
1 - 2
MCU / Peripherals @ 5V (Vcc)
JP63
(Vcc 5V / 3V)
2 - 3
MCU / Peripherals @ 3.3V (Vcc)
1 - 2
Supply to Core voltage regulator same as JP63
selection(V_ALL)
JP64
(VDD5R
3V/V_ALL)
2 - 3
Supply to Core voltage regulator is 3.3V
Closed
Power supply VBoard connected to V_ALL
JP52
(V_ALL)
Open
Power supply VBoard not connected to V_ALL
Closed
Power supply V_ALL connected to V_MCU
JP55
(V_MCU)
Open
Power supply V_ALL not connected to V_MCU
1-2
Gate of MOSFET (Q2) connected to Vin
JP25
2-3
Gate of MOSFET (Q2) connected to INH pin of
FlexRay transceiver (X9, X1)
Closed
Vs of LIN A is powered by the board (Vin)
JP40
(Vin_A)
Open
No voltage supply to Vs of LIN A
Closed
Vs of LIN B is powered by the board (Vin)
JP60
(Vin_B)
Open
No voltage supply to Vs of LIN B
