[問題] 兩顆MCU對接,I/O pin漏電流問題
各位大大好
我的板子上面有兩顆MCU(簡稱A1,A2)
A1是吃3.3V, A2則是吃多組電源(1.8V,3.3V)
彼此用UART溝通
發現當A1斷電時(此時A2有上電),量測A1 VDD pin還有2.6V左右的電壓
查了一下,把UART的TX RX給斷開後,此電壓就沒了
詢問了一下公司前輩,他說這樣是正常的現象
IC的I/O腳通常會有(漏電?)的現象
跟IC的內部構造有關?
但是我還是不太了解
請問各位前輩有其它見解嗎? 感激不盡!
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