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easyEmbedded Systems Engineer interview question

How do you approach reading a datasheet for a new sensor or microcontroller?

What the interviewer wants to hear

  • Start with overview, block diagram and pinout
  • Check electrical characteristics and absolute maximum ratings
  • Study the interface: protocol, timing diagrams, register map
  • Look for power-up sequence, reset and initialisation steps
  • Read errata and application notes

Model answer

I start with the overview and block diagram to understand what the part does, then the pinout and package. Next I check the electrical characteristics: supply range, current in each mode, logic levels, and the absolute maximum ratings so the design stays safe. For the interface I read the protocol section closely, such as I2C address, SPI mode or maximum clock, along with the timing diagrams and the register map with reset values. I look for the power-up and initialisation sequence, for example a startup delay or a required configuration write before measuring. I always read the errata sheet, because silicon bugs can waste days, and the application notes for recommended circuits and example code. While reading, I note key numbers and open questions for the hardware engineer, and later compare the logic analyser trace with the timing diagrams.

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