CM118B Datasheet, PDF (5/25 Pages) C-Media Electronics – Highly Integrated & Configurable USB Audio Single Chip

CM118B
Highly Integrated & Configurable USB Audio Single Chip
2.3 Pin Signal Descriptions
Pin #
1
2
3
4
5
6
7
8
9
Symbol
DALRCK
DASCLK
VOLDN
SPDIFO
DR
DW
SK
CS
MUTER
Type
DO, 2mA, SR
DO, 2mA, SR
DI, ST, PU
DO, 4mA, SR
DI, 8mA, PD, 5VT
DO, 4mA, SR
DO, 4mA, SR
DO, 4mA, SR
DI, ST, PU
10
PWRSEL
DI, ST, PU
11
DREG18
12
DREG33
13
MODE
P
P
DI, ST, PD
14
LEDO
DO, SR, 4mA
15
DVSS
P
16
GPIO4
DIO, 8mA, PD, 5VT
17
GPIO5
DIO, 8mA, PD, 5VT
18
GPIO6
DIO, 8mA, PD, 5VT
19
MUTEP
DI, ST, PU
20
LEDR
DO, SR, 4mA
21
TEST
DI, ST, PD
Description
DAC I2S left/right clock
DAC I2S serial clock
Volume down (edge trigger with de-bouncing)
SPDIF Output
EEPROM interface data read from EEPROM
EEPROM interface data write to EEPROM
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 Power with 100mA；L：Bus Power with
500mA
Headset Mode H：Bus Power with 100mA；L：Bus Power with
500mA
1.8V Regulator Output for Digital Core
3.3V Regulator Output for Digital I/O
H: Pull Up to 3.3V; L: Pull Down to Ground
When MICONLY:H
MODE
L：Headset Mode: Playback & Recording
H：Speaker Mode: Playback Only
When MICONLY:L
MODE
L：Stereo MIC Mode: Stereo Recording
H：Mono MIC Mode: Mono Recording
LED for Operation; Output H for Power On; Toggling for Data
Transmit
Digital Ground
GPIO Pin
GPIO Pin
GPIO Pin
Mute Playback (Edge Trigger with de-Bouncing)
LED for Mute Recording Indicator; Output H when Recording is
Muted
Test Mode Select Pin; Pull Low for Normal Operation
22
AVSS
23
VBIASL
24
VREF
25
MICINL
26
VBIASR
27
MICINR
28
AVDD
29
LOL
30
LOBS
31
LOR
32
AVSS
33
AVDD
34
DVDD
35
DVSS
36
AREG36
P
Analog Ground
AO
Microphone Bias Voltage Supply for Left Channel (3V)
AO
Connecting to External Decoupling Capacitor for Embedded
Bandgap Circuit; 1.75V Output
AI
Microphone Input for Left Channel
AO
Microphone Bias Voltage Supply for Right Channel (3V)
AI
Microphone Input for Right Channel
P
5V Analog Power for Analog Circuit
AO
Line Out Left Channel
AO
DC 1.75V Output for Line Out Bias
AO
Line Out Right Channel
P
Analog Ground
P
5V Analog Power for Analog Circuit
P
5V Power Supply to Internal Regulator
P
Digital Grounding
P
3.6V analog power for analog circuit
Datasheet Revision: 1.00
Page 5 / 25
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