AK4538 Datasheet, PDF (59/70 Pages) Asahi Kasei Microsystems – 16Bit DS CODEC with MIC/HP/SPK-AMP

ASAHI KASEI
[AK4538]
CONTOROL SEQUENCE
n 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)
MOUT2 bit
(Addr:02H, D0)
ALCS bit
(Addr:02H, D1)
HPL/R bits
(Addr:03H, D1-0)
DAHS bit
(Addr:03H, D7)
DIF1-0 bits
(Addr:04H, D1-0)
BF bit
(Addr:04H, D2)
PLL1-0 bits
(Addr:04H, D7-6)
(2)
(3)
(4)
(5)
(6)
10
0
00
E xam p le :
A udio I/F Fo r m a t : I²S
B ICK frequency at Master Mode : 64fs
Input M a s t e 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 ” → “H ”
(3 ) A d d r:0 0 H , Data 80H
(4 ) A d d r:0 2 H , Data 03H
(5 ) A d d r:0 3 H , Data 80H
(6 ) A d d r:0 4 H , Data 42H
XX
X
XX
Figure 47. Power Up Sequence
<Example>
(1) Power Supply
(2) PDN pin = “L” → “H”
“L” time of 150ns or more is needed to reset the AK4538.
(3) Power up VCOM : PMVCM bit = “0” → “1”
VCOM should first be powered up before the other block operates.
(4) Set up register 02H : MOUT2 bit = ALCS bit = “0” → “1”
Set the MOUT2 and ALCS bits to “1” when using the Speaker-amp.
(5) Set up register 03H : HPL bit = HPR bit = “1” → “0”, DAHS bit = “0” → “1”
(6) Set up register 04H
• DIF1-0 bits set the audio interface format.
• BF bit sets BICK output frequency in master mode.
• PLL1-0 bits set MCLK input frequency in PLL mode.
MS0198-E-01
- 59 -
2003/5