在做的东西对体积要求很高，尽量的小，现在想输出负电压，想问下430如果负参考电压接负的，da模块能输出负电压吗？
还有一个小问题：用430的硬件spi外接DAC模块ltc2664，输出类似方波，最小脉宽只能100us左右，是spi的限制还是我的dac选的有问题？需要考虑哪几个参数呢？
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