我用android手机或者笔记本电脑连接我的CC2540时都需要先输入PIN码，配对后才能通信，Iphone7的LightBlue搜索到CC2540设备后直接就可以通信上，但是使用一段时间后也会弹出输入PIN码，但不影响前面的正常通信，请问这是为什么？
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