NWZ-A726/A726B/A728/A728B/A729
33
• IC Pin Function Description
MAIN BOARD IC302 CS43L21-CNZR (A/D CONVERTER, D/A CONVERTER, HEADPHONE AMP)
Pin No.
Pin Name
I/O
Description
1
LRCK
O
L/R sampling clock signal output to the system controller
2
SDA/CDIN
I
Serial data input from the system controller
3
SCL/CCLK
I
Serial data transfer clock signal input from the system controller
4
AD0/nCS
I
Chip select signal input from the system controller
5
VA_HP
-
Power supply terminal (+1.8V)
6
FLYP
I
External charge pump capacitor (positive node) connection terminal
7
GND_HP
-
Ground terminal
8
FLYN
I
External charge pump capacitor (negative node) connection terminal
9
VSS_HP
O
Negative voltage from charge pump output terminal
10
AOUTB
O
Analog audio (R-ch) signal output to the headphone and WM-PORT connector
11
AOUTA
O
Analog audio (L-ch) signal output to the headphone and WM-PORT connector
12
VA
-
Power supply terminal (+1.8V)
13
AGND
-
Ground terminal
14
D
O
Positive reference voltage output terminal
15
VQ
O
Quiescent voltage output terminal
16
A
O
Positive reference voltage output terminal
17
MICIN1/AIN3A
I
Microphone signal input terminal Not used
18
MICIN2/AIN3B/BIAS
I
Microphone signal input terminal Not used
19
AIN2A
I
Analog audio (L-ch) signal input terminal Not used
20
AIN2B/BIAS
I
Analog audio (R-ch) signal input terminal Not used
21, 22
AFILTA, AFILTB
O
Filter connection terminal Not used
23
AIN1A
I
Analog audio (L-ch) signal input terminal Not used
24
AIN1B
I
Analog audio (R-ch) signal input terminal Not used
25
nRESET
I
Reset signal input from the system controller
26
VL
-
Power supply terminal (+2.9V)
27
VD
-
Power supply terminal (+1.8V)
28
DGND
-
Ground terminal
29
SDOUT
O
Serial audio data output to the system controller
30
MCLK
I
Master clock signal input from the system controller
31
SCLK
O
Bit clock signal output to the system controller
32
SDIN
I
Serial audio data input from the system controller
33
AGND
-
Ground terminal
