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The first thing to verify on a newly assembled board is

  • A.the continuity of the debug connector
  • B.the firmware image in the flash memory
  • C.the supply rails and their sequencing
  • D.the clock frequency at the processor

Answer: C

A reversed regulator or a shorted rail can destroy every device on the board the moment power is applied, and it costs nothing to check with a meter first. Current-limiting the bench supply for the first power-up is the companion precaution.

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