TAS5711上电时序？？？？

按照TAS5711的datasheet中的上电时序进行上电，芯片正常工作，但是无法编辑寄存器，是时序有问题吗？

我是按照这个上电时序来上电的：AVDD/DVDD上电（3.3V），上电之前A_SEL pulldown，PDN接PGND，RESET接PGND。上电之后，PDN拉高，RESET恢复，然后接PVDD。之后就无法写入寄存器了，求各位指教！！！

user151383853：

这里可能有两个问题,第一个是硬件问题, 比如供电, 焊接, 信号连接是否正确和可靠
第二, 时序里的延时时间是否足够, 可以先有意加长一些

Kailyn Chen：

关于上电时序，可以参考Figure57的时序图，注意reset需要等AVDD/DVDD上电起来至少100us再把reset 拉高。

另外， datasheet Page39中给出了初始化的顺序，按照这个步骤进行下，看在哪个步骤出现问题。

Initialization SequenceUse the following sequence to power-up and initialize the device: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 RESET = 0, PDN = 1, and other digital inputs to their desired state while ensuring thatall are never more than 2.5 V above AVDD/DVDD. Wait at least 100 μs, drive RESET = 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 μsafter 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).