设计的一块板子,ENA脚串1K电阻到MCU IO,但MCU IO未作任何配置的情况下,发现上电ENA脚电压已经是5V,芯片已经正常工作了。看手册是这个引脚悬空的话内部会自己上拉到5V。难道我的接法不对?怎么保证在IO没置高电平前芯片不要工作?
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