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BQ4050在怎么驱动LED显示

Other Parts Discussed in Thread: BQ4050

BQ4050,现在我们使用的是4个LED,LED相关的几个寄存器配置如下:

现在的情况是,这么配置后,DISP脚给一个高到低的脉冲后,在空闲状态和放电状态下,led灯不亮,是不是哪里有问题?或者还有哪里要配置?但我使能LEDCHG后,充电情况下,DISP脚给一个高到低的脉冲后,LED能显示。