Write to register 0x0C
a value of 0x10
Read register 0x06
Is Value 0xF0
NO
YES
Write to register 0x0C
a value of 0x00
This command tells all channels
to transition to mute mode.
The process is complete when
register 0x06 has the value of 0xF0.
This command tells all channels to
transition to PLAY mode.
Play mode
There is a gain ramp when transitioning
from MUTE to PLAY that takes 90 ms
to complete. PLAY mode is reached
when register 0x06 is 0x0F.
Mute mode
Hi-Z mode
There is a common mode ramp
when transitioning from hi-Z to MUTE
that takes 30 ms to complete.
The device is now in MUTE mode.
The device starts in hi-Z mode.
TAS54x4C Software Design Guidelines
2.3
Using the Device to Play Music
The device is now powered on, load diagnostics may have run, and the device is configured. The output
stages are in hi-Z mode. The output stages must transition from hi-Z mode to mute mode, and then into
play mode to minimize pops or clicks in the speakers.
The register values shown in
are for all four channels. If any channels do not to follow this
sequence the values must be adjusted accordingly.
NOTE:
Pop and click reducing ramps are not available if any channels are already in mute mode or
play mode.
Figure 11. Turnon flowchart
22
TAS54x4C Design Guide
SLOA196 – June 2014
Copyright © 2014, Texas Instruments Incorporated
