In SX Microcontrollers, SX/B Compiler and SX-Key Tool, william wrote:

Mark,

The reason why you need 2 regulators is because your board uses too much 5V current.
My estimate of your ECU's 5V current consumption is 170 - 220mA.

This may overheat the power regulators if you put the board into a casing without forced convection or heat sink.
Putting the 2 regulators so close together is also a bad idea, considering the heating.

My humble advice would be to run the SX at 20Mhz instead.
This will drop your total (whole board) 5V current consumption to less than 50mA, then you only need one 5V regulator without a need for any heatsink.

I assume you must be using assembly for this project, b'cos if you use SX/B, it would be difficult to talk to a PC while managing the engine in real time.  So at 20Mhz or 20 MIPS, running an engine at 10,000 rpm, you will get 2000 instructions per engine revolution, which I think is a workable proposition.

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