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CC2340R5: Shutdown模式电流达不到150na

Part Number: CC2340R5

我的程序基于oad_onchip修改,当检测到开关关闭后,进入shutdown模式,在进入shutdown模式前关闭了用到的外设,检测shutdown模式电流还有600ua:

请问,这个电流是怎么来的,是否需要关闭时钟、停止广播等操作,如果需要这个Api是啥呢?