HT66FV1x0 Integrated Audio Amplifier Application Guideline
AN0486EN V1.10
11 / 16
June 8, 2021
Process of Stopping Voice Playing
(1)
Ramp Down
When powering off:
Disable the power amplifier
(PAEN=0)
Increase PLADH/PLADL gradually to 8000H
Volume setup:
USVC6~USVC0=000_0000
Decrease PLADH/PLADL gradually from 8000H to 0000H
Disable the DAC and speaker
(DAEN=0
,
MUTEB=0)
Ramp down software flow as shown below
Ramp Down
Disable Power Amplifier
(PAEN
=
0)
PLADH/PLADL
=
8000H?
PLADH/PLADL>8000H?
16-bit Play Data
(PLADH/PLADL)+1
16-bit Play Data
(PLADH/PLADL)-1
Volume Setup
(USVC6~USVC0
=
000_0000)
16-bit Play Data
(PLADH/PLADL)-1
PLADH/PLADL
=
0000H?
Disable Speaker and DAC
(MUTEB
=
0, DAEN
=
0)
Return
Y
Y
N
N
Y
N
(2)
Power Off Sequence
Similar to the power on sequence, setting the PC7/SCSAB pin from 0 to 1 will cause
instantaneous change of V33, which will affect VCC resulting in unstable output. Initiate the
ramp down process first when the SPI is still on (PC7/SCSAB
=0
) before setting the pin from 0
to 1 to disable the SPI function. This will reduce pop noise.
