BM28723AMUV
Description of Function - continued
11 Power Supply Start-up Sequence
① Power up VCCP1, VCCP2 simultaneously.
The setup order of VCCP1
(and VCCP2) and DVDD does
VCCP1,VCCP2
DVDD
VCCP1
VCCP2
DVDD
not have the constraint
3V
t
t
Keep RSTX to low during the
section which LRCLK,BCLK is
unstable in.
Input stable LRCLK,BCLK in the technical limit
range to show in P.26 after RSTX =high .
Take measures to show it in P.63 when input of
BCLK,LRCLK becomes unstable.
After DVDD
rises, Input
BCLK and
LRCLK.
BCLK
LRCLK
SDATA
Set RSTX to high after input more than
1ms in stable LRCLK,BCLK in the
technical limit range to show to P.26
② After DVDD
rises and 10 or
more ms
More than
10ms
passes, Input
stable LRCLK
and BCLK.
where after set
RSTX to high.
RSTX
t
More than
1ms
③ After set
RSTX to high
and 1 or more
ms passes,
please send 2
wire command.
SDA
SCL
t
Data
transmis
sion
Data
transmi
ssion
Refer to
P.62
Refer to
P.62
(No.3 to
(No.5 to
No.17)
No.4)
More than 100ms
MUTEX
④ Set MUTEX to high.
t
TWAIT: Refer to P.74
OUT1P
OUT1N
OUT2P
OUT2N
t
Soft start time
Speaker
BTL output
(After LC filter)
t
Figure 43. Power Supply Start-up Sequence
Caution 1: Refer to P.62 “20. The wake-up Procedure of power-up”.
Caution 2: Make sure to input Low to RSTX pin from external at the time power up DVDD.
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TSZ22111 • 15 • 001
31.Aug.2018 Rev.001
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