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tps64132芯片,PGND接地问题

Other Parts Discussed in Thread: TPS65132

最近使用TPS65132芯片,出现了一些问题,GND必须与大地连接采集效果特别好,与板子上的GND连接不和大地连接采集数值不准,看到芯片手册上,将电源接地平面保持在顶层(所有电容器接地和PGND引脚必须与一个不间断的接地层相连)。是跟这个有关系吗?还是哪里的问题,求大神指导