Is there a application note or schematic, that shows recommended power pins/pads circuit for the MPC5634M
I am using the 208 BGA version.
Unfortunately we do not have a specific hardware design guide for the MPC5634M device. I could recommend you some general or MPC55xx appnotes that could be useful:
AN3254 - Power Supplies on the MPC5500:
AN3208 - Crystal Oscillator Troubleshooting Guide:
AN1706 - Microcontroller Oscillator Circuit Design Considerations:
AN1259 - System Design and Layout Techniques for Noise Reduction:
AN2706 - EMC Guidelines for MPC5500-Based Systems:
AN2705 - Signal Integrity Considerations with MPC5500-based systems:
AN2127 - EMC Guidelines for MPC Based Automotive Powertrain Systems:
Also there is a document for MPC5644A that is similar device:
I would recommend you to follow up our EVB board that can be considered as reference design:
Thank you for the links. In all the documentation I have read, shows the VDD pins being powered via a BCP68 that is controlled by the VRCCTL pin.
Can the VDD pins be powered directly by 5 volts, so the BCP68 circuit is not used.
I am thinking the BCP68 circuit is so the micro can use less energy. I have a 110 amp alternator as the power supply and this is driven by a 500 hp engine. I am not really struggling for electrical energy/power.
No, it cannot be powered directly by 5V.
VDD is 1.2V voltage domain, it must be powered by 1.2V+-10%, the voltage is allowed to be powered externally (i.e. without bypass transistor), in this case voltage range is even tighter (1.26V-1.32V).
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