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DRV10983-Q1芯片无法和上位机通信

Other Parts Discussed in Thread: DRV10983-Q1, DRV10983

完全按照官方推荐的电路图和原理图做的板子,焊上DRV10983-Q1芯片后,上位机无法读写寄存器,芯片的1.8V引脚输出正常,3.3VLDO输出异常,大概电平掉至1.45V,5V输出的step-dowm也输出异常,只有800mv的电压,电感上电流没有在斩波,以为是芯片问题,换了芯片还是这样请问为什么?