![]() Watch their output current, though, make sure it's >=500mA max) For instance, the HLK-PM01 would work really well here (but there also are other integrated 5V switch converters that can work. In general, why not use a 5V PSU? I don't see the 12V being used for anything but the LDOs. I assume the TRANSFO_12V block actually is a transformer plus bridge rectifier plus smoothing caps, or actually a switched mode power supply in any case, something that spits out a reasonably smooth 12VDC and not AC? If not, you should add a bridge rectifier and some hefty electrolythics. This way, the power dissipation resulting form the voltage drop between the 12V and 3.3V line is shared between the two LDOs. Makes it easier to automatically flash your board (resetting and putting it in boot mode using handshake pins on your USB-to-serial-converter), making development less painful. ![]() I'd put the reset, GPIO0, TxD, RxD and Gnd on one connector. For instance, it suggests a slightly more complex reset circuit consisting of a RC-combination. In general, check the hardware design guidelines for what applies to your situation. ![]()
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