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现在我用MCU驱动TLC5941可以点亮LED了，但是要不停的向TLC5941写数据才能保持LED一直亮，一旦停止写数据，LED就灭了，请问是哪里设置的不对，还是说TLC5941没有锁存功能？请大神帮忙，谢谢了。
原理图如下：
