TAS5721使用的时候为什么PDN需要拉低一下才有声音输出？

TAS5721使用的时候为什么需要拉低一下才有声音输出？其它的产品我记得，PDN不用接都没有问题的？

你好：

          你测试下你的OUT脚是不是配置完就有PWM波输出，能否把原理图放上来看下

附上图片，帮忙看下

TAS5721初始化过程中并不需要拉低PND。初始化过程：

1. Hold all digital inputs low and ramp up AVDD/DVDD to at least 3 V.
2. Initialize digital inputs and PVDD supply as follows:
• Drive RST = 0, PDN = 1, and other digital inputs to their desired state while ensuring that all
are never more than 2.5 V above AVDD/DVDD. Wait at least 100 μs, drive RST = 1, and wait
at least another 13.5 ms.
• Ramp up PVDD to at least 8 V while ensuring that it remains below 6 V for at least 100 μs
after AVDD/DVDD reaches 3 V. Then wait at least another 10 μs.
3. Trim oscillator (write 0x00 to register 0x1B) and wait at least 50 ms.
4. Configure the DAP via I2C (see Users's Guide for typical values).
5. Configure remaining registers.
6. Exit shutdown (sequence defined below).

Exit shutdown：

1. Write 0x00 to register 0x05 (exit shutdown command may not be serviced for as much as 240 ms
after trim following AVDD/DVDD powerup ramp).
2. Wait at least 1 ms + 1.3 × tstart (where tstart is 300 ms when mid-Z ramp is enabled and is
otherwise specified by register 0x1A).
3. Proceed with normal operation

请检查您是否正确按照顺序编程

你好：

          能否post上来你的寄存器配置？还有就是你在不PDN器件之前，读写一下0X02寄存器（先写0x00，然后再读回来），看结果怎么样。

         然后PDN之后，在读写一次看是否值已经清掉。