AK4955 Datasheet, PDF (105/117 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP/ LDO & DSP

[AK4955]
5. EXT Master Mode
Power Supply
PDN pin
PMVCM bit
(Addr:00H, D6)
MCKI pin
M/S bit
(Addr:01H, D3)
LRCK pin
BICK pin
(1)
(5)
(2) ⁽³⁾
(4)
Example:
Audio I/F Format: MSB justified (ADC and DAC)
Input MCKI frequency: 256fs
Sampling Frequency: 48kHz
BCKO: 64fs
(1) Power Supply & PDN pin = “L” Æ “H”
(2) Dummy command
(3) MCKI input
(4)Addr:05H, Data:0AH
Addr:06H, Data:02H
Input
Addr:01H, Data:08H
Output
BICK and LRCK output
(5) Addr:00H, Data:40H
Figure 82. Clock Set Up Sequence (5)
<Example>
(1) After Power Up: PDN pin “L” → “H”
“L” time of 180ns or more is needed to reset the AK4955.
(2) Dummy Command must be input during this period.
(3) MCKI is supplied.
(4) After DIF1-0, BCKO and FS3-0 bits are set. M/S bit should be set to “1”. Then LRCK and BICK are output.
(5) 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.
MS1343-E-00
- 105 -
2011/12