CM108AH Datasheet, PDF (7/27 Pages) C-Media Electronics – Highly Integrated USB Audio I/O Controller

CM108AH
Highly Integrated USB Audio I/O Controller
34
AVDD2
P
5V power supply for analog circuit
35
DVDD
P
5V power supply for internal regulator
36
DVSS2
P
Digital ground
37
REGV
AO
3.3V reference output for internal 5V to 3.3V regulator
Mixer enable select, worked by MODE pin,
H: with mixer/AA-path enabled (with default mute)
38
MSEL
DI, ST
L: without mixer/AA-path disabled
(H: push up to 3.3V, L: push down to ground)
USB descriptors will also be changed accordingly
39
VOLUP
DI, ST, PU Volume up (edge trigger with de-bouncing)
Power down switch control signal (for PMOS polarity)
40
PDSW
DO, 4mA , OD 0: normal operation
1: power down mode (suspend mode)
41
USBDP
AIO
USB Data D+
42
USBDM
AIO
USB Data D-
43
GPIO1
DIO, 8mA,
PD, 5VT
GPIO pin
44
SDOUT
DO, 4mA, SR DAC I2S data output
45
DAMCLK
DO, 4mA, SR
11.2896 MHz output for 44.1KHz sampled data and
12.288 MHz output for 48KHz sampled data
46
DALRCK
DO, 4mA, SR DAC I2S left/right clock
47
DASCLK
DO, 4mA, SR DAC I2S serial clock
48
VOLDN
DI, ST, PU Volume down (edge trigger with de-bouncing)
Note: DI / DO / DIO – Digital Input / Output / Bi-Directional Pad
U
AI / AO / AIO – Analog Input / Output / Bi-Directional Pad
SR – Slew Rate Control
ST – Schmitt Trigger
PD / PU – Pull Down / Pull Up
5VT – 5 Volt Tolerant (3.3V Pad)
OD – Open Drain
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Rev. 2.1︱ Page 7/27