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BQ76920: 供电正常,芯片不工作

Part Number: BQ76920

使用BQ7692003的芯片进行3串锂电池的监测,有一路IIC连接到MCU上进行读写数据,但是芯片一直没有工作起来,REGOUT也没有输出,TS1引脚加了激活脉冲了,电压大概为2.7V左右(大于Vboot max1V)脉宽大于2ms,也更换过芯片,现象一样,这个是怎么回事?