Post-Assembly
- Check all required components are assembled and DNP components are not assembled
- Verify components oriented correctly (polarity, pin 1 designators, etc.)
- Verify there are no bridges between parts/pins creating unwanted shorts
- Verify general soldering quality - no stray solder, burns, etc., all pins and pads connected with enough solder
Unpowered Tests
- Verify power rails are not shorted to GND or with each other
- Verify EN/RST/SHDN pins are not shorted to either GND or a power rail, unless it is supposed to be
- Verify communication protocol lines (i.e. SDA & SCL for I2C, MISO MOSI SCLK & CS for SPI, etc.) are not shorted with each other, with a power rail, or GND
If any shorts are found, do not connect the board to a power supply. Locate and attempt to fix the cause of any shorts before continuing.
Basic Powered Tests
General Tests:
- Power on board + touch test, verify components and the board itself does not get too hot
- Probe power rails, verify correct voltage
- Verify all ICs, components, LEDs, etc. are powered on successfully. Communicate with all peripherals
- Program microcontroller
48V-5V buck converter & 48V-17V buck converter:
- Enable conditions function as expected
- Verify output current limit
- Verify output voltage limit
5V smart high-side switches:
- Verify enable condition
- Verify output current limit
17V high-side switch:
- Verify enable condition
Changes for Next Rev
R44 and R45 ar 0603 and should be 0805