Fujitsu SK-91464A-100PMC User Manual - Page 12

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3.2 Power Supply (JP: 29, 30, 37, 43, 44, 45)

Two 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 JP44 and

JP45. 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.

JP29 Selects the MCU IO and peripherals Vcc voltage (3.3V or 5V)

JP30 Selects the MCU Core voltage regulator input voltage (3.3V / 5V)

JP37 Connects the MCU IO voltage to Vcc. Can be used for current measurement.

JP43 Main supply on / off

JP44 Connects Vs (Pin 1 of X8) to Vin

JP45 Connects Vs (Pin 1 of X6) to Vin

Jumper

JP29

(VDD5 3V/5V)

JP30

(VDD5R 3V/5V)

JP37

(VDD5)

JP43

(Mains on/off)

JP44

(VBAT_A)

JP45

(VBAT_B)

FMEMCU-UG-910025-15

SK-91464A-100PMC User Guide

Chapter 3 Jumpers and Switches

Setting

Description

1 - 2

MCU / Peripherals @ 5V

2 - 3

MCU / Peripherals @ 3.3V

1 - 2

Supply to Core voltage regulator is 5V

2 - 3

Supply to Core voltage regulator is 3.3V

Closed

Power supply Vcc connected to VDD5

Open

Power supply Vcc not connected to VDD5

Closed

The board is switched on

Open

The board is switched off

Closed

Vs of LIN A is powered by the board

Open

No voltage supply to Vs of LIN A

Closed

Vs of LIN B is powered by the board

Open

No voltage supply to Vs of LIN B

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