SK-96380-120PMT User Guide
Chapter 3 Jumpers and Switches
FMEMCU-UG-960001-15
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© Fujitsu Microelectronics Europe GmbH
3.2 Power
Supply
(S2, JP:16, 17, 28, 22, 42)
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.
S2
Power
Switch
JP16
Connects the MCU IO voltage to Vcc. It can be used for current measurement.
JP17
Selects the Stepper Motor Driver Voltage (3.3V or 5V)
JP28, 42
Connects VBat (Pin 1 of D-Sub Connector) to Vs
JP22
Mains jumper; overrides the power switch S2.
Switch
Setting
Description
ON (1-2)
Power ON
S2
OFF (2-3)
Power OFF
Table 3-2: Power Switch
Jumper
Setting
Description
1 - 2
MCU disconnected from Vcc
JP16
(MCUVCC)
2 - 3
MCU connected to Vcc
1 - 2
SMC supply voltage regulator is 3.3V
JP17
(DVCC)
2 - 3
SMC supply voltage regulator is 5V
Closed
Vs (Pin1) of LIN connector is powered by the board
JP28, 42
(VBAT)
Open
No voltage supply to Vs of LIN
Closed
Board is always on
JP22
(Mains)
Open
S2 switches the Board on and off
Table 3-3: Power Supply Configuration
By default, all Board supplies are set to 5V.
