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Original question:

TAS5825M: when PVDD is not applied, but DVDD is applied and also there is I2S and I2C signal on it, is this condition no...

TAS5825M: Figure 7-15. Power-Down Sequence

NY
Expert 3040 points
Part Number: TAS5825M


Hi experts, 

Customer is asking about power-down sequence, figure 7-15 shows once PVDD off then DVDD is off. 

if the sequence is vioration, DVDD down -> PVDD down, what's the probelm? 

if Back EMF caused by speaker, goes up to over 4.5V, how the device behave? 

Best Regards, ny

  • +1
    TI__Expert 5840 points

    Hi

    1. About the first question, after you set the device pull down and wait a 6ms delay, DVDD or PVDD whoever pulls down first is both okay. But we recommend that you use our recommended power-down configuration.
    2. About the second question, do you mean when you power down your output exist a back EMF voltage? If it is, it's no problem, when you set the device pull down, The output of the chip is a high impedance and the back EMF will not affect the device.

    Best regards.

    Wei Qiu.