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BQ27750 PACK+-处理及I2C上拉电阻?

BQ27750用于一节18650的电量检测.

1.设备中不给电池充电,BQ27750原理图中的的PACK+-应该如何处理?接地还是悬空?

2.I2C通信接口,.BQ27750的数据手册中未见加上拉电阻,而EVM的中添加了上拉电阻,现将BQ27750和MCU连接需不需要给I2C添加上拉电阻,阻值应该多大?

谢谢!