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PCM1863 的MICBIAS相关问题

Other Parts Discussed in Thread: PCM1863

PCM1863 的MICBIAS开启条件是什么?是不是上电默认就是开启并有输出的?我的板子,在上电后PCM1863 的MICBIAS没有输出,配置page3 0x15寄存器,也没输出:

pcm1863_write(0x00, 0x03, pcm1863_i2c);
pcm1863_write(0x15, 0x01, pcm1863_i2c);

vref有输出;用示波器量MICBIAS,有一个很窄的脉冲然后就没输出了。这个有什么可能?