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TMS320C5517芯片发热,会是什么原因

最近在自己制作的板子上测试程序,发现一旦对UART初始化,芯片就会在一分钟之内热的烫手。程序曾经在评估板上测试过,在评估板上没有这个现象。在不用UART时,虽然有点温度,但是没有这么热。测量了芯片的提供电压,都正常。

想问下,导致发热的原因都有哪些?