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TAS6424E-Q1: 6624 output pop noise

Yao YunXuan
Prodigy 200 points
Part Number: TAS6424E-Q1
Other Parts Discussed in Thread: TAS6424

Tool/software:

Hi Team,

We build a solution with 6424E, it output to a external amplifier, the external amplifier output to speaker,below are the startup codes of 6424.

write to 0x6A ack data: 0x00 0x0F
write to 0x6A ack data: 0x01 0x32
write to 0x6A ack data: 0x02 0x60
write to 0x6A ack data: 0x03 0x44
write to 0x6A ack data: 0x04 0x00
write to 0x6A ack data: 0x05 0xFF
write to 0x6A ack data: 0x06 0xFF
write to 0x6A ack data: 0x07 0xFF
write to 0x6A ack data: 0x08 0xFF
write to 0x6A ack data: 0x09 0x01

After head unit power on, it will output a pop noise(only one time).

I have some questions need your help:

1:Why 6424 can accept I2C data before mcu pull up standby pin?

2:If 6424 can accept I2C data before mcu pull up standby pin, should we pull up the standby pin after we complete the initialization of 6424?

3:How this pop noise come from, we have set 0x01 to register 0x09.

Best Regards.

  • 0
    TI__Mastermind 49430 points

    Hi

    Yao YunXuan said:
    1:Why 6424 can accept I2C data before mcu pull up standby pin?

    After DVDD power supply ready, I2C is able to use.

    Yao YunXuan said:
    2:If 6424 can accept I2C data before mcu pull up standby pin, should we pull up the standby pin after we complete the initialization of 6424?

    Could do that, but may not help to your problem.

    Yao YunXuan said:
    3:How this pop noise come from, we have set 0x01 to register 0x09.

    It should because the external amplifier have additional Gain, and amplified the TAS6424 original pop voltage. Original 7mV is not able to be heard from speaker, but if you amplified like 10 times, would be another story.

    Suggest to Mute external amplifier, during TAS6424 power up. Could avoid this problem.