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BQ76920: 电池uv保护,请问我设置的3.5V,但是实际电池电压给的3.6但是输出依然还有了请问是怎么回事了

Part Number: BQ76920

// 保护寄存器配置
tmp = (3500- s_bq.offset) * 1000 / s_bq.gain;
tmp &= (0xFF << 4);
tmp >>= 4;
buf[0] = tmp;
bq_write_reg(BQ_OV_TRIP, buf, 1); // 过压保护 3.5

请问是不是那设置有问题了???