I'd like to power Arduino Pro Micro (5v) from MCP2025-500 LIN BUS transceiver.
Can I connect MCP2025-500 Vreg pin directly to Arduino Pro Micro (5v) RAW pin?
Electrical – Power Arduino Pro Micro from MCP2025 Vreg
arduinolinpower
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I think you're killing the tantalum capacitor across the input. In fact, it looks like it's bulged up in your photo.
Although the capacitor may be rated at 16V (I don't actually see a rating anywhere, but I'm inferring it from the size and input voltage spec) seasoned engineers will never use tantalum capacitors in this sort of situation. The input current needs to be limited by several ohms and/or the rated voltage should be something like three times the operating voltage. Your wall wart can probably supply several amperes.
Years ago, this information was anecdotal, but today you can find it buried deep within the manuals for such parts. They bury it, because it means you very seldom should use tantalum capacitors, and almost never across power supply rails unless the current is limited to much less than an ampere.
Many have been burned by this (perhaps literally). Often failures take place long after product has been shipped, and can cause localized charring, meaning (if your standards are high, as in aerospace or medical) the entire board must be scrapped.
Yes, it is possible if the phone supports USB OTG. FTDI have Android drivers on their website. It should be even possible to access it like a normal serial port, details are here
The connector is not mini-b, this is micro-b (the board) and micro-ab (the phone). You need OTG cable with micro-a and micro-b such as this.
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Best Answer
No you can't connect to the RAW pin input if you want to run your MCU at 5 V.
You need to connect to the UVVC input and may have to solder closed a jumper position on the PCB depending on whether you bought the board as a 3.3 V or 5V version.
If your board has a MIC5219-3 then the RAW input is typically 5 V.
If your board has a MIC5219-5 then the RAW input is typically greater than 5 V.
The dropout voltage for the MIC5219-5 (you said you were using a 5 V unit) means the input voltage should be more than 5.175 - 5.25 V or you are under the dropout limit.
Source image
You can easily power your Pro Micro from the MCP2025 (max 70 mA output) since the ATMega32u4 will only draw an absolute maximum of about 27 mA (16 MHz @ 5 V). To this you must of course add any I/O current you draw from the output pins to GND. This could easily add to more than the MCU draws, so be careful here.
In the ATMega 32u4 datasheet read Table 29-1 and carefully read and understand the notes to the table. The total I/O sink current (which is sourced from your power supply) cannot exceed 100 mA total.