CM109 Datasheet, PDF (9/36 Pages) C-Media Electronics – USB I/O Controller

CM109
High Integration / Low Cost USB Audio Controller
for PC Internet Phone
25
VBIAS
AO
Microphone Bias Voltage Supply (4.5V)
26
VREF
27
MICIN
28
VSEL
29
AVDD1
30
LOL
31
LOBS
32
LOR
33
AVSS2
AO
Connecting to External Decoupling Capacitor for Embedded Bandgap
Circuit; 2.25V Output
AI
Microphone Input
Line Out Voltage Swing Select
AI
H: Pull Up to 5V, L: Pull Down to Ground
L: 2.5Vpp Output；H: 3.5Vpp Output
P
5V Analog Power for Analog Circuit
AO
Line Out Left Channel
AO
DC 2.25V Output for Line Out Bias
AO
Line Out Right Channel
P
Analog Ground
34
AVDD2
P
5V Analog Power for Analog Circuit
35
DVDD
P
5V Power Supply to Internal Regulator
36
DVSS2
P
Digital Grounding
37
REGV
AO
3.3V Reference Output for Internal 5V Æ 3.3V Regulator
38
MSEL
DI, ST
Mixer Enable Select
H: Pull Up to 3.3V, L: Pull Down to Ground
L: Without Mixer; H: With Mixer (With Default Mute)
USB Descriptors are changed accordingly
39
VOLUP
DI, ST, PU Volume Up (Edge Trigger with de-Bouncing)
Power Down Switch Control (for PMOS Polarity)
40
PDSW DO, 4mA , OD
0: Normal Mode, 1: Power Down Mode
41
USBDP
AIO
USB Data D+
42
USBDM
AIO
USB Data D-
DIO, 8mA,
43
GPIO1
GPIO Pin
PD, 5VT
44
SCLK
DIO, 8mA,
External MCU Serial Bus Clock Pin
PD, 5VT
External MCU Interrupt Pin
45
MINT
DO, 4mA, SR When Register Address 4 ~ 7 has new data, MINT is set Low; after
MCU read MINT is reset to H
DIO, 8mA,
46
SDAT
External MCU Serial Bus Data Pin
PD, 5VT
External MCU Clock Pin, Clock Frequency is Programmable
47
MCLK DO, 4mA, SR
Default is 1.5 MHz (Options Include, 6MHz, 3MHz, 1.5MHz)
48
VOLDN
DI, ST, PU Volume Down (Edge Trigger with de-Bouncing)
Date: 08/Sep/2005
-8-
Version: 1.3a