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I see 5.87504V in the area that I think is where the MCU pin would need to stay under 5.3V. Am I reading this correctly? I once posted a hacked together wiki about AN/Digi protection it's found here https://code.google.com/p/daecu/wiki/AN_and_DIGI_Protection Sorry it's very un-polished, however the ...

Beware .1 to .01 ohm connections in P30. They can create tank circuit which can cause stepper motor failures by creating excessive voltage spikes.

I'm not seeing the need for these buffers, the MCU input is already high impedance. Perhaps the goal is to have a replaceable component in hopes you'll protect the MCU.

With the clamping diodes I don't see much of need for the op-amp. I guess you get the drop from 5V to 3V, however you can do that with a resistor divider. I don't see much of a need for R9 or C5. Perhaps that op-amp is sensitive to RF noise on the front end. C1 - C4 are not ESD protected, they could...

The 150 ohm and .01uF are a very high cut off low pass filter. Those are commonly used on the output of the op-amp. The op-amp is a high gain device, when making a rapid change it can cause some high frequency ringing. This clamp simply blocks high frequency RF from coming out of the op-amp. Because...

All in all, not a bad regulator layout. However it's very inefficient, and you'll have to ensure you remove those BTU's to maintain a large temperature range. If you are running 1A on the 5V with a 16V battery, you'll be dissipating (16-5) * 1 = 11 watts of energy. That's 11 watts wasted to provide ...

OEM's have lots of control over how things are manufactured, so they can predict and control things very well. Most notably is the low side impedance when under full injector loads. As an example, if you have 8 cyl, with small injectors, such that you run 99% duty, you'll have a min of 8 amps flowin...

BAT199 has is a bit long in the tooth relative to reverse recovery time coming in at 3uS. I have used the BAT54 for similar with a reverse recovery of 5nS. I also like that the voltage drop on the BAT54 is lower. It drops .1V at 1mA where the BAT199 drops .9V. When I used the BAT54, my goal was to l...