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BQ40Z50: BQ40Z50的SMBC,SMBD IO电压是多少,还需要外部的上拉吗

Part Number: BQ40Z50
Other Parts Discussed in Thread: EV2400

这个是电池的保护板电路图,请问这个SMBC,SMBD IO电压是多少,1.8V还是3.3V?还需要外部的上拉吗? 谢谢。