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TLV320AIC3106: 无法设置MICBIAS偏置电压

Part Number: TLV320AIC3106

如题,我们已经将硬件电路上MICBIAS引脚与后级电路断开,但是测量芯片MICBIAS引脚电压始终为0

Page 0 / Register 25: MICBIAS Control Register该寄存器设置为0x80和0x40(即设置2.5V和2V),测量MICBIAS引脚电压都为0,耳机插上不插上都是0

请帮忙看下是什么原因,谢谢