CM119B
USB Audio Single Chip
4.3 Pin Signal Descriptions
Pin #
Symbol
Type
Description
1
SPDIFO
DO, 8mA, SR
SPDIF Output
USB Controller Data Read From EEPROM Interface
EEPROM Data Output
USB Controller Data Writes to EEPROM Interface
EEPROM Data Input
2
3
DR
DIO, 8mA, PD, 5VT
DO, 4mA, SR
DW
4
5
6
SK
CS
MUTER
DO, 4mA, SR
DO, 4mA, SR
DI, ST, PU
EEPROM Interface Clock (100KHz)
EEPROM Interface Chip Select
Mute Recording (Edge Trigger with de-Bouncing)
H: Pull Up to 3.3V; L: Pull Down to Ground
Speaker Mode H：Self-Powered with 100mA；L：Bus Power with
500mA Headset Mode H：Bus Power with 100mA；L：Bus Power with
500mA
7
PWRSEL
DI, ST
8
9
DREG18
DREG33
P
P
1.8V Regulator Output for Digital Core
3.3V Regulator Output for Digital I/O (driving current 40mA)
H: Pull Up to 3.3V; L: Pull Down to Ground
L：Headset Mode: Playback & Recording
H：Speaker Mode: Playback Only
10
MODE
DI, ST
11
12
GPIO2
LEDO
DIO, 8mA, PD, 5VT GPIO Pin
LED for Operation; Output H for Power On; Toggling for Data
Transmit
DIO, 8mA, PD, 5VT GPIO Pin
DO, SR, 4mA
13
14
15
16
17
18
19
20
GPIO3
DVSS
P
Digital Ground
GPIO4
GPIO5
GPIO6
MUTEP
BUZZ
DIO, 8mA, PD, 5VT GPIO Pin
DIO, 8mA, PD, 5VT GPIO Pin
DIO, 8mA, PD, 5VT GPIO Pin
DI, ST, PU
DO, 8mA, SR
Mute Playback (Edge Trigger with de-Bouncing)
Buzzer Output Pin
GPIO7
DIO, 8mA, PD, 5VT GPIO Pin
LED for Mute Recording Indicator; Outputs H when Recording is
Muted
21
LEDR
DO, SR, 4mA
22
23
GPIO8
TEST
DIO, 8mA, PD, 5VT GPIO Pin
DI, ST, PD
Test Mode Select Pin; Pull Low for Normal Operation
24
25
AVSS
VBIAS
P
AO
Analog Ground
Microphone Bias Voltage Supply (3V)
Connecting to External Decoupling Capacitor for Embedded
Bandgap Circuit; 1.75V Output
Microphone Input, input impedance is 10k Ohm
N.C.
5V Analog Power for Analog Circuit
Line Out Left Channel
DC 1.75V Output for Line Out Bias
Line Out Right Channel
26
VREF
AO
27
28
29
30
31
32
33
34
35
36
37
MICIN
N.C.
AVDD
LOL
LOBS
LOR
AVSS
AVDD
DVDD
DVSS
AREG36
AI
--
P
AO
AO
AO
P
P
P
P
P
Analog Ground
5V Analog Power for Analog Circuit
5V Power Supply to Internal Regulator
Digital Grounding
3.6V analog power for analog circuit
Mixer Enable/Disable Pin
H: Pull Up to 3.3V, L: Pull Down to Ground
L: Without Mixer
38
MSEL
DI, ST
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Revised: Aug. 2013 Copyright© C-Media Electronics Inc.
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