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Hi Sirs,
My customer encountered a pop noise problem with TPA6166 when writing 0x07 register (0x07 = 0xb9).
We found a workaround by writing the minimum gain of -42dB (0x07 = 0x80) before writing 0x07 to our desired value which can reduce pop noise but not solved completely..
Here we need product line to identify the investigate in theory:
Initial Code:
------------------------------------------------------------------------------------
#op i2c Addr Data Comment
w 80 1e 19 #Enable Registers 3
w 80 04 08 #Interrupt Mask Register 1
w 80 05 00 #Interrupt Mask Register 2
w 80 07 80 #Left Headphone Volume Register = -42dB
w 80 08 79 #Right Headphone Volume Register = LR Tracking
w 80 09 c7 #Microphone/Ground Control = +24dB
w 80 12 01 #Reserved Registers
w 80 13 45 #Reserved Registers
w 80 1a 95 #Jack Detect AC Test Settings
w 80 1e 01 #semi auto mode
w 80 1d 80 #Enable Registers 2
w 80 07 b9 #Left Headphone Volume Register = 0dB
------------------------------------------------------------------------------------
Mute:
------------------------------------------------------------------------------------
w 80 07 F9 # Headphone Volume Register = -42dB
w 80 09 C7 # Headphone Volume Register = Mute
w 80 1D 80
Unmute:
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w 80 07 80 # Headphone Volume Register = -42dB
w 80 07 B9 # Headphone Volume Register = 0dB
w 80 09 C7
w 80 1D 80
------------------------------------------------------------------------------------
Thank you and Best regards,
Wayne Chen
05/31/2021
Hi Wayne,
We'll take a look at this and provide further comments after analysis.
Do you need to understand the reason of these commands helping with the pop?
Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators
Hello Ivan,
We reduced the gain to minimum (-42dB) before mute and unmute the device (similar to a soft ramp). It reduces pop noise but not resolved completely. Hence we need BU's official suggestion to reduce the pop noise.
Thank you and Best regards,
Wayne Chen
06/01/2021
Hi Wayne,
Understood, let me get back with further details this Wednesday.
Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators
Hi Wayne,
I'll be reaching out through the email thread. Will come back here after that for final comments.
Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators