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MPC5668EVB Users Manual Rev 0.1 May 2009
MPC5668EVBUM/D Page 4 of 29
The Power supply
section is located in
the bottom left area
of the EVB
3.1 Power Supply Configuration
The EVB requires an external power supply voltage of 12V DC, minimum 1A. This allows the EVB to be easily
used in a vehicle if required. The single input voltage is regulated on-board using 3 switching and 1 linear
regulators to provide the necessary EVB and MCU operating voltages of 5.0V, 3.3V and 2.5V. For flexibility
there are two different power supply input connectors on the EVB as detailed below.
3.1.1 Power Supply Connectors
2.1mm Barrel Connector – P22:
This connector should be used to connect the supplied wall-plug mains adapter. Note – if a replacement or
alternative adapter is used, care must be taken to ensure the 2.1mm plug uses the correct polarisation as
shown below:
Figure 3-2 2.1mm Power Connector
2-Way Lever Connector – P23:
This can be used to connect a bare wire lead to the EVB, typically from a laboratory power supply. The
polarisation of the connectors is clearly marked on the EVB. Care must be taken to ensure correct connection.
Figure 3-3 2-Lever Power Connector
3.1.2 Power Switch (SW6)
Slide switch SW6 can be used to isolate the power supply input from the EVB voltage regulators if required.
Moving the slide switch to the right (away from connector P23) will turn the EVB on .
Moving the slide switch to the left (towards connector P23) will turn the EVB off .
GND
V+ (12V)
GND
V+ (12V)