The one that blew me away was the JW5211 switching regulator. I thought he was being a bit extravagant by not just using a cheap linear regulator...but that buck regulator costs 4.5 cents.
Guess I'm a little behind the times. Sure, throw three of them on the board at that price.
Only other surprise was the MOSFET labeled "Q_NMOS_GSD" for the status/power LED. At first glance, with the pull-up resistor, it looks like the FET does nothing. Then I located the reference net (a flag would have helped) on pin 13, so you can turn on/off the LED with the processor, or (depending on initial state of that pin) it will power up with the LED on and turn off only after the processor boots. Neat!
Guess I'm a little behind the times. Sure, throw three of them on the board at that price.
Only other surprise was the MOSFET labeled "Q_NMOS_GSD" for the status/power LED. At first glance, with the pull-up resistor, it looks like the FET does nothing. Then I located the reference net (a flag would have helped) on pin 13, so you can turn on/off the LED with the processor, or (depending on initial state of that pin) it will power up with the LED on and turn off only after the processor boots. Neat!