CM108B Datasheet, PDF (8/24 Pages) C-Media Electronics – A Highly Integrated USB Audio Single Chip

CM108B
USB Audio Single Chip
Mixer enable select:
H: push up to 3.3V, L: push down to ground
38
MSEL
DI, ST, PU
H: with mixer/AA-path enabled (with default mute)
L: without mixer/AA-path disabled
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, 2mA, SR DAC I2S data output
45
DAMCLK
DO, 2mA, SR
11.2896 MHz output for 44.1KHz sampled data and
12.288 MHz output for 48KHz sampled data
46
DALRCK
DO, 2mA, SR DAC I2S left/right clock
47
DASCLK
DO, 2mA, SR DAC I2S serial clock
48
VOLDN
DI, ST, PU
Volume down (edge trigger with de-bouncing)
NoteU: DI / DO / DIO – Digital Input / Output / Bi-Directional Pad
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
P – Power Supply Pin
Datasheet Revision: 1.11
Page 8 / 24
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