AK4955 Datasheet, PDF (104/117 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP/ LDO & DSP

[AK4955]
4. EXT Slave Mode
Power Supply
PDN pin
PMVCM bit
(Addr:00H, D6)
MCKI pin
LRCK pin
BICK pin
(1)
(2) (3)
Example:
Audio I/F Format: MSB jusified (ADC and D AC)
Input MCKI frequency: 256fs
Sampling Frequency: 48kHz
(1) Power Supply & PDN pin = “L” Æ “H”
(4)
Input
(4)
Input
(2)Dummy command
Addr:05H, Data:02H
Addr:06H, Data:02H
(3) Addr:00H, Data:40H
MCKI, BICK and LRCK input
Figure 81. Clock Set Up Sequence (4)
<Example>
(1) After Power Up: PDN pin “L” → “H”
“L” time of 180ns or more is needed to reset the AK4955.
(2) After Dummy Command input, DIF1-0 and FS3-0 bits must be set during this period.
(3) Power Up VCOM and Regulator: PMVCM bit = “0” → “1”
VCOM and Regulator must first be powered-up before the other block operates. Power up time is 0.4ms (typ)
and 1.0ms (max) when both capacitances of an external capacitor for the VCOM and REGFIL pins are 2.2μF.
(4) Normal operation starts after the MCKI, LRCK and BICK are supplied.
MS1343-E-00
- 104 -
2011/12