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参照bq4050demo做的板子无法通信

Other Parts Discussed in Thread: BQSTUDIO, BQ40Z50, BQ4050, EV2400

最近用bq40z50开发产品,bq4050的管脚都是参照数据手册上的原理图接线的。在连接上3串锂电池后(第一节cell已经短接),经过万用表测量,BAT和VCC上有11v多的电压。PRE管脚接了地,PACK端也加上了电池端电压,但是这个时候用EV2400连接,bqstudio就是认不出芯片,或者说发送信号给40z50根本没回应。

请问一下,还有哪些管脚的接线错误会导致通信失败呢?