AK7755EN_16 Datasheet, PDF (31/109 Pages) Asahi Kasei Microsystems – DSP with Mono ADC Stereo CODEC + Mic/Lineout Amp

[AK7755]
CONT00: Clock Setting 1, Analog Input Setting
Write during clock reset.
W R Name D7
C0h 40h CONT00 0
D6
D5
CKM[2] CKM[1]
D4
CKM[0]
D3
AINE
D2
DFS[2]
D1
DFS[1]
D0
DFS[0]
Default
00h
D6, D5, D4: CKM[2:0] Clock Mode Setting
CKM
mode
CKM
[2:0]
Master
Slave
Main Clock
0
000 Master XTI=12.288MHz fixed
1
001 Master XTI=18.432MHz fixed
2
010 Slave XTI=12.288MHz fixed
3
011 Slave BICK
fs
fs=8~96kHz
fs=8~96kHz
fs=8~96kHz
fs=8~96kHz
5
101 Slave BICK
fs=16kHz
TDM256 bit (CONT02: D7) = “1” cannot be used in CKM mode5.
System Clock
XTI
XTI
XTI, BICK, LRCK
BICK, LRCK
BICK,
LRCK(fs=8kHz)
(default)
D3: AINE Analog Input Setting (IN1/INP1, IN2/INN1, IN3/INP2, IN4/INN2 pin)
0: Not Using Analog Input (default)
1: Using Analog Input
Set AINE bit to “1” first before other control register settings when using the IN1/INP1, IN2/INN1,
IN3/INP2 and IN4/INN2 pins as analog inputs. The AK7755 starts charging to a capacitor connected
to each pin by this setting.
Set AINE bit to “0” when using digital microphones (DMIC1 or DMIC2 bit (CONT1E: D7, D4)=
“1”).
D2, D1, D0: DFS[2:0] Sampling Frequency
DFS mode DFS[2:0]
fs
0
000
8kHz (default)
1
001
12kHz
2
010
16kHz
3
011
24kHz
4
100
32kHz
5
101
48kHz
6
110
96kHz
7
111
N/A
Multiply 44.1/48 to calculate the values for multiple sampling frequencies of 44.1kHz.
Write “0” into the “0” registers.
014006643-E-00
- 31 -
2014/10