Power Manager II Fault Logger

LatticeReferenceDesign-LogoFor systems using microprocessors or computers there are usually numerous power supplies. If a power supply fails the power manager circuits may, as a minimum, force a shutdown. For maintenance and troubleshooting it is very desirable to know which power supply failed and the type of failure condition (over-voltage or under-voltage).

This reference design presents a solution that records the supply fault condition in non-volatile memory so the fault(s) can read back at some later time. This solution is fast, reliable, and cost effective because, it is based on a Power Manager II, MachXO, and nonvolatile SPI flash memory.

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Block Diagram

Performance and Size

Tested Devices* Performance I/O Pins Design Size Revision
LC4512V-35T176C >70 MHz 19 261 Macrocells 1.2
LCMXO2280C-5FT256C >70 MHz 19 251 LUTs 1.2
LFXP2-5E-5FT256C >70 MHz 19 302 LUTs 1.2

* May work in other devices as well.

Note: The performance and design sizes shown above are estimates only. The actual results may vary depending upon the chosen parameters, timing constraints, and device implementation. See the design's documentation for details. All coding and design work was done on a PC platform unless noted otherwise.


Technical Resources
Power Supply Fault Logging - Source Code
RD1062 1.2 6/30/2010 ZIP 123.4 KB
Power Supply Fault Logging - Documentation
RD1062 1.2 6/30/2010 PDF 127.8 KB

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