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https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/576213/tpsm84a21evm-808-the-significance-of-keep-out-area
外接区域用于？
禁止区域 是因为设备的这些区域中存在通孔，我们希望避免在这些通孔下直接出现任何可能的铜短路。 禁止入内区域不包括引脚9和19。
