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In order to save test device, usually will do Power to Ground then IO to Power/Ground and the last is Io to IO.
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The reason is:2 L) a1 e7 \! O2 Q# s" N
1. If power to ground can not pass, the rest combination has less chance to pass
: P; E, C; c6 b. e" j) z- A, `2. Usually power pin count is less than IO pin count. It is fast to get an idea how the chip's ESD level' i1 Y3 ^2 x1 k3 G8 @3 f0 u$ p
3. If failed, it's easy to find the failed ESD zapping combination |
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