ASAHI KASEI
[AK4537]
MS0202-E-04
2005/04
-
61
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CONTOROL SEQUENCE
Power up
Upon power-up, bring the PDN pin = “L”. Initialize the internal registers to default values after the PDN pin = “H”. Set
the following registers to establish the initial condition.
Pow er Supply
PDN pin
PMVCM bit
(Addr:00H, D7)
DIF1-0 bits
(Addr:04H, D1-0)
BF bit
(Addr:04H, D2)
PLL1-0 bits
(Addr:04H, D7-6)
MOUT2 bit
(Addr:02H, D0)
ALCS bit
(Addr:02H, D1)
DAHS bit
(Addr:03H, D7)
(2)
10
XX
X
XX
00
0
(3)
(4)
(6)
(5)
E x a m p le :
A ud io I/F F o rm a t : I
2
S
B IC K f re q u e nc y a t M a s te r M o d e : 6 4 f s
Inp ut M a s te r C lo c k S e le c t a t P L L M o d e : 1 1 .2 8 9 6 M H z
(1 ) P o w e r S u p p ly
(2 ) P D N p in = “L ”
o
“H ”
(3 ) A d d r:0 0 H , D a t a 8 0 H
(4 ) A d d r: 0 2 H , D a ta 0 3 H
(5 ) A d d r: 0 3 H , D a ta 8 3 H
(6 ) A d d r: 0 4 H , D a ta 4 2 H
Figure 48. Power Up Sequence
<Example>
(1) Power Supply
(2) PDN pin = “L”
o
“H”
“L” time of 150ns or more is needed to reset the AK4537.
(3) Power up VCOM : PMVCM bit = “0”
o
“1”
VCOM should first be powered up before the other block operates.
(4) Set up register 02H : MOUT2 bit = ALCS bit = “0”
o
“1”
Set the MOUT2 and ALCS bits to “1” when using the Speaker-amp.
(5) Set up register 03H : HPL bit = HPR bit = “1”
o
“0”, DAHS bit = “0”
o
“1”
(6) Set up register 04H
x
DIF1-0 bits set the audio interface format.
x
BF bit sets BICK output frequency in master mode.
x
PLL1-0 bits set MCLK input frequency in PLL mode.
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