S32R274 EVB User Guide
7
3.1.1
Motherboard Power Supply Connectors
2.1mm Barrel Connector – P26:
Figure 3.
Figure 3.
2.1mm Power Connector
Screw Terminal Power Connector – P33:
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 (Pin 1 = +12v). Care must be taken to
ensure correct connection.
Figure 4.
Figure 4.
Screw Terminal 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:
•
1.25V_SR: 1.25V switching regulator to supply the core voltage
•
5V_SR: 5V switching regulator to supply the power management controller, I/O and peripherals
•
3.3V_SR: 3.3V switching regulator for Ethernet, FlexRAY, debug and I/O
•
5V_LR: 5V linear regulator for ADC supply and reference