Configuration
—Motherboard
MPC5777C EVB User Guide, Rev. 1
5
NXP Semiconductors
3.1.1
Motherboard Power Supply Connectors
2.1 mm Barrel Connector – P26:
Figure 3: 2.1 mm Power Connector
2-Way Lever Connector – P33:
This can be used to connect a bare wire lead to the EVB, typically from a laboratory power supply.
The polarization of the connectors is clearly marked on the EVB. Care must be taken to ensure correct
connection.
Figure 4: Lever Power Connector
3.1.2
Regulator Power Jumpers
There are four power regulator circuits on the MPC57xx motherboard that supply the required voltages
to operate the MCUs:
• 5V_SR: 5 V switching regulator to supply the power management controller, I/O and peripherals
• 3.3V_SR: 3.3 V switching regulator for Ethernet, debug and I/O
• 5V_LR: 5 V linear regulator for ADC supply and reference
All of the regulators have the option of being disabled/ enabled if they are not required. By default
(jumpers are off), all of the switching regulators are enabled and the 5 V linear regulator is disabled. The
regulators can be enabled individually by the following jumper settings:
• Connecting J57 enables the 5 V linear regulator
• Disconnecting J58 enables the 5 V switching regulator
• Disconnecting J59 enables the 3.3 V switching regulator
• Disconnecting J60 enables the 1.25 V switching regulator
The regulators supply power to the daughter cards through the board connector. The individual
selection and configuration of the MCU supplies are done on the daughter cards.
