AK4640_05 Datasheet, PDF (64/78 Pages) Asahi Kasei Microsystems – 16-Bit ΔΣ CODEC with MIC/HP/SPK-AMP

ASAHI KASEI
[AK4640]
CONTOROL SEQUENCE
„ Power up
Upon power-up, bring the PDN pin = “L”. Initialize the internal registers to default values after the PDN pin = “H”. When
the power supplies are partially powered OFF, the AK4640 must be reset by bringing PDN pin “L” after these power
supplies are powered ON again. 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 rm at : I²S
B IC K frequency at M aster M o de : 64fs
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 ow er S u p p ly
(2 ) P D N p in = “L ” → “H ”
(3 ) A d d r:0 0 H , D ata 8 0 H
(4) A d d r:0 2H , D ata 0 3H
(5) A d d r:0 3H , D ata 80 H
(6) A d d r:0 4H , D ata 4 2H
XX
X
XX
Figure 46. Power Up Sequence
<Example>
(1) Power Supply
(2) PDN pin = “L” → “H”
“L” time of 150ns or more is needed to reset the AK4640.
(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 MCKI input frequency in PLL mode.
MS0273-E-02
- 64 -
2005/04