CM118B
Highly Integrated & Configurable USB Audio Single Chip
DESCRIPTION
FEATURES
The CM118B is a highly integrated, crystal-less USB
audio single chip solution optimized for USB
headset, headphone, dongle, microphone and
application such as VoIP (voice over Internet
protocol).
All essential analog modules are
embedded in the CM118B, including dual DAC and
ADC, earphone driver, microphone booster, PLL,
regulator, and USB transceiver. It also supports 3
GPIO pins. In addition, audio adjustment can be
easily controlled via specific HID compliant volume
control pins. Many features such as headset,
headphone and microphone only topologies are
programmable with jumper pins. Vender can
customize unique USB VID / PID / Product String /
Manufacture String and min/max/initial volumes to
the external EEPROM. The CM118B also offers
anti-pop noise circuits design and internal oscillator
which can operate without an external crystal
oscillator.
Compliant with USB 2.0 Full Speed Operation
Compliant with USB Audio Device Class v1.0
Supports USB Suspend/Resume Mode and Remote
Wakeup with Volume Control pins
On-chip oscillator to provide reference sources for
PLL and embedded USB transceiver
Jumper pin for Headset Mode (Playback +
Recording), Microphone Mode (Stereo and Mono
Mode
Recording),or
Speaker/Headphone
(Playback Only)
Jumper pin for Mixer Unit enable/disable under
Headset Mod, and Power Mode setting
I2C interface to access internal registers, and I2S
Output for external DAC
In Headset Mode, USB audio function topology has
2 Input Terminals, 2 Output Terminals, 1 Mixer
Unit, 1 Selector Unit, and 3 Feature Units
In Speaker Mode, USB audio function topology has
1 Input Terminal, 1 Output Terminal, and 1
Feature Unit.
In Microphone Mode, USB audio function topology
has 1 Input Terminal, 1 Output Terminal, 1
Selector Unit and 1 Feature Unit.
Anti-pop noise design for plug and unplug.
BLOCK DIAGRAM
VOLUP
DASCLK
VOLDN
DALRCK
MUTER LEDO
SCLK DAMCLK
MUTEP LEDR GPIOs SDAT SDOUT
PWRSEL
MODE
AREG36 DREG33 DREG18 PDSW MSEL
3.6V
3.3V
I2C
1.8V
Regulator
5->3.6, 3.3 & 1.8
I2S Out
Interface Logics
LOBS
USB Control
VRE
F
16 bit
DAC
LOR
0 ~ -37dB
DW
DR
SK
CS
SPI
USBDP
USBDN
USB
USB
Interface
EEPROM
Interface
ISO Out
Processing
16 bit
DAC
LOL
0 ~ -37dB
SRAM
USB TRX
8 ~ -22dB
MICINR
16 bit
ADC
PLL
RF
48M
23 ~ -22dB
ISO In
Processing
12dB/22dB
Booster
8 ~ -22dB
12M
MICINL
16 bit
ADC
VREF
bandgap
Datasheet Revision: 1.00
Page 1 / 25
23 ~ -22dB
12dB/22dB
Booster
VREF
(1.75V)
VBIAS
(3V)
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Copyright© C-Media Electronics Inc.
CM118B
Highly Integrated & Configurable USB Audio Single Chip
RELEASE NOTES
Revision
1.00
Datasheet Revision: 1.00
Page 2 / 25
Date
23 May 2014
Description
-
First release
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Copyright© C-Media Electronics Inc.
CM118B
Highly Integrated & Configurable USB Audio Single Chip
LIST OF CONTENTS
1. Ordering Information .................................................................................................................... 4
2. Pin Descriptions.............................................................................................................................. 4
2.1 Pin Assignment by Pin Number ..................................................................................................... 4
2.2 Pin-Out Diagram ............................................................................................................................ 4
2.3 Pin Signal Descriptions.................................................................................................................. 5
3. USB Topology .................................................................................................................................. 7
3.1 Headset Topology with Mixer ....................................................................................................... 7
3.2 Speaker Topology .......................................................................................................................... 8
3.3 Microphone Topology.................................................................................................................... 9
4. Function Description ................................................................................................................... 10
4.1 Content Format for EEPROM (93C46) ....................................................................................... 10
4.2 EEPROM SPI Interface Timing Information .............................................................................. 11
4.3 Jumper Pins and Mode Settings ................................................................................................... 12
4.4 MCU Interface ............................................................................................................................. 13
4.5 HID Feature and Descriptor......................................................................................................... 17
4.6 Internal Registers ......................................................................................................................... 18
5. Electrical Characteristics ........................................................................................................... 22
5.1 Absolute Maximum Rating ....................................................................................................... 22
5.2 DC Specifications ...................................................................................................................... 22
5.3 Operation Conditions................................................................................................................ 22
5.4 Electrical Parameters ............................................................................................................... 23
6. Package dimensions..................................................................................................................... 24
Reference ................................................................................................................................................ 25
Datasheet Revision: 1.00
Page 3 / 25
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CM118B
Highly Integrated & Configurable USB Audio Single Chip
1. Ordering Information
Product
Package Marking
Package Type
Transport
Media
Storage
Temperature
CM118B
CM118B
LQFP-48 (7 x 7mm)
Green Package
Tray
-45 to 120℃
2. Pin Descriptions
Pin Assignment by Pin Number
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
Pin #
13
14
15
16
17
18
19
20
21
22
23
24
Signal Name
MODE
LEDO
DVSS
GPIO4
GPIO5
GPIO6
MUTEP
LEDR
TEST
AVSS
VBIASL
VREF
Pin #
25
26
27
28
29
30
31
32
33
34
35
36
Signal Name
MICINL
VBIASR
MICINR
AVDD
LOL
LOBS
LOR
AVSS
AVDD
DVDD
DVSS
AREG36
Pin #
37
38
39
40
41
42
43
44
45
46
47
48
Signal Name
DREG18
MICONLY
MSEL
VOLUP
PDSW
DREG33
USBDP
USBDM
SCLK
SDOUT
DAMCLK
SDAT
Datasheet Revision: 1.00
Page 4 / 25
DVDD
AVDD
AVSS
LOR
LOBS
LOL
AVDD
MICINR
VBIASR
MICINL
33
32
31
30
29
28
27
26
25
35
34
AREG36
DVSS
36
Pin-Out Diagram
DREG18
37
24
MICONLY
38
23
VBIASL
MSEL
39
22
AVSS
VOLUP
40
21
TEST
PDSW
41
20
LEDR
DREG33
42
19
MUTEP
18
GPIO6
17
GPIO5
CM118B
VREF
USBDP
43
USBDM
44
SCLK
45
16
GPIO4
LQFP-48
7
8
9
10
11
12
SK
MUTER
PWRSEL
DREG18
DREG33
6
CS
5
DR
MODE
DW
13
4
48
3
LEDO
SDAT
VOLDN
DVSS
14
SPDIFO
15
47
2
46
1
SDOUT
DAMCLK
DASCLK
2.2
Signal Name
DALRCK
DASCLK
VOLDN
SPDIFO
DW
DR
SK
CS
MUTER
PWRSEL
DREG18
DREG33
DALRCK
2.1
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Copyright© C-Media Electronics Inc.
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
12
13
DREG18
DREG33
MODE
P
P
DI, ST, PD
14
LEDO
DO, SR, 4mA
15
16
17
18
19
20
DVSS
GPIO4
GPIO5
GPIO6
MUTEP
LEDR
P
DIO, 8mA, PD, 5VT
DIO, 8mA, PD, 5VT
DIO, 8mA, PD, 5VT
DI, ST, PU
DO, SR, 4mA
21
TEST
DI, ST, PD
22
23
24
AVSS
VBIASL
VREF
P
AO
AO
25
26
27
28
29
30
31
32
33
34
35
36
MICINL
VBIASR
MICINR
AVDD
LOL
LOBS
LOR
AVSS
AVDD
DVDD
DVSS
AREG36
AI
AO
AI
P
AO
AO
AO
P
P
P
P
P
Datasheet Revision: 1.00
Page 5 / 25
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
Analog Ground
Microphone Bias Voltage Supply for Left Channel (3V)
Connecting to External Decoupling Capacitor for Embedded
Bandgap Circuit; 1.75V Output
Microphone Input for Left Channel
Microphone Bias Voltage Supply for Right Channel (3V)
Microphone Input for Right Channel
5V Analog Power for Analog Circuit
Line Out Left Channel
DC 1.75V Output for Line Out Bias
Line Out Right Channel
Analog Ground
5V Analog Power for Analog Circuit
5V Power Supply to Internal Regulator
Digital Grounding
3.6V analog power for analog circuit
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Copyright© C-Media Electronics Inc.
CM118B
Highly Integrated & Configurable USB Audio Single Chip
37
38
DREG18
MICONLY
P
DI, ST, PU
39
MSEL
DI, ST, PU
40
41
VOLUP
PDSW
DI, ST, PU
DO, 4mA , OD
42
43
44
45
46
DREG33
USBDP
USBDM
SCLK
SDOUT
P
AIO
AIO
DI, ST, PD, 5VT
DO, 2mA, SR
47
DAMCLK
DO, 2mA, SR
48
SDAT
DIO, 8mA, PD, 5VT
1.8V Regulator Output for Digital Core
Microphone only and Headset Topology Selection
H: Pull Up to 3.3V; L: Pull Down to Ground
MICONLY
H: Headset or Speaker Topology
L: Microphone Only Topology
Mixer Enable/Disable or Selector On/Off Pin
H: Pull Up to 3.3V, L: Pull Down to Ground
When MICONLY: H
MSEL
L: Without AA Mixer
H: With AA Mixer (Default Mute)
When MICONLY: L
MSEL
L: Selector is off
H: Selector is on
Descriptors are changed accordingly
Volume Up (Edge Trigger with de-Bouncing)
Power Down Switch Control (for PMOS Polarity)
0: Normal Mode, 1: Power Down Mode
3.3V Regulator Output for Digital I/O
USB Data D+
USB Data DExternal MCU Serial Bus Clock Pin for I2C
DAC I2S data output
DAC MCLK
11.2896 MHz output for 44.1KHz sampled data and
12.288 MHz output for 48KHz sampled data
External MCU Serial Bus Data Pin for I2C
Note: DI / DO / DIO – Digital Input / Output / Bi-Directional Pin, AI / AO / AIO – Analog Input / Output / Bi-Directional
Pin, SR – Slew Rate Control, ST – Schmitt Trigger, PD / PU – Pull Down / Pull Up, 5VT – 5 Volt Tolerant (3.3V Pin), OD –
Open Drain, P – Power Supply Pin
Datasheet Revision: 1.00
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Copyright© C-Media Electronics Inc.
CM118B
Highly Integrated & Configurable USB Audio Single Chip
3. USB Topology
The CM118B supports USB Headset / USB Speaker / USB Microphone topology that can be selected by pins.
Detail setting please refer to chapter 6.4 – Jumper Pins and Mode Setting
3.1
Headset Topology with Mixer
0X0F
MIXER
0X01
IT
0X09
FEA
0X06
OT
0X08
SEL
0X07
OT
0X0D
FEA
0X02
IT
0X0A
FEA
Device Descriptor
Offset
0
1
2
4
5
6
7
8
10
Field
bLength
bDescriptorType
bcdUSB
bDeviceClass
bDeviceSubClass
bDeviceProtocol
bMaxPacketSize0
idVendor
idProduct
Size
1
1
2
1
1
1
1
2
2
Value (Hex)
12
01
0110
00
00
00
8
0d8c
0016
12
bcdDevice
2
0100
1
01
1
02
1
00
1
01
14
15
16
17
iManufacturer
iProduct
iSerialNumber
bNumConfigurations
Description
Total 18 Bytes
Device descriptor
USB 1.1 compliant
Device class specified by interface
Device subclass specified by interface
Device protocol specified by interface
Endpoint zero Size = 8 bytes
Vendor ID
Product ID
Device compliant to the Audio Device Class specification
version 1.00
Index of string descriptor that characterizes the
manufacturer
Index of string descriptor that characterizes the product
Index of string descriptor that characterizes the device’s
serial number
Configurations number = 1
Configuration Descriptor
Offset
0
1
2
4
Field
bLength
bDescriptorType
wTotalLength
bNumInterfaces
Datasheet Revision: 1.00
Page 7 / 25
Size
1
1
2
1
Value (Hex)
Description
09
Total 9 Bytes
02
Configuration descriptor
Total length of data returned for this configuration:
XXXX
Programmable by MSEL and MODE pin
Number of interfaces supported by this configuration:
04
0: control interface
1: ISO-OUT interface
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Copyright© C-Media Electronics Inc.
CM118B
Highly Integrated & Configurable USB Audio Single Chip
5
bConfigurationValue
1
01
6
iConfiguration
1
00
7
8
bmAttributes
bMaxPower
1
2
80
32
2: ISO-IN interface
3: INT-IN(HID) interface
Configuration value
Index of string descriptor that characterizes this
configuration
Bus Power and support Remote Wakeup
Maximum power consumption of the USB Device: 100mA
Speaker Topology
3.2
0X01
IT
0X09
FEA
0X06
OT
Device Descriptor
Offset
0
1
2
4
5
6
7
8
10
12
Field
bLength
bDescriptorType
bcdUSB
bDeviceClass
bDeviceSubClass
bDeviceProtocol
bMaxPacketSize0
idVendor
idProduct
bcdDevice
Size
1
1
2
1
1
1
1
2
2
2
Value (Hex)
12
01
0110
00
00
00
08
0d8c
0016
0100
14
iManufacturer
1
01
15
iProduct
1
02
16
iSerialNumber
1
00
17
bNumConfigurations
1
01
Description
Descriptor length
Device descriptor
USB 1.1 compliant
Device class specified by interface
Device subclass specified by interface
Device protocol specified by interface
Endpoint zero packet size
Vendor ID
Product ID
Device release number
Index of string descriptor that characterizes the
manufacturer
Index of string descriptor that characterizes the product
Index of string descriptor that characterizes the serial
number
Number of configuration
Configuration Descriptor
Offset
0
1
2
Field
bLength
bDescriptorType
wTotalLength
Size
1
1
2
4
bNumInterfaces
1
5
bConfigurationValue
1
6
iConfiguration
1
7
8
bmAttributes
bMaxPower
1
1
Datasheet Revision: 1.00
Page 8 / 25
Value (Hex)
Description
09
Descriptor length
02
Configuration descriptor
008A
Total length of data returned for this configuration
Number of interfaces supported by this Configuration:
00: Control
03
01: ISO-Out
02: INT-IN (HID)
01
Configuration value
Index of string descriptor that characterizes this
00
configuration
80
Attributes(PWRSEL=0:Bus Powered, 1:SELF Powered)
32
Maximum power consumption from bus = 100mA
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Copyright© C-Media Electronics Inc.
CM118B
Highly Integrated & Configurable USB Audio Single Chip
Microphone Topology
3.3
0X0A
FEA
0X02
IT
0X08
SEL
0X07
OT
Device Descriptor
Offset
0
1
2
4
5
6
7
8
10
12
Field
bLength
bDescriptorType
bcdUSB
bDeviceClass
bDeviceSubClass
bDeviceProtocol
bMaxPacketSize0
idVendor
idProduct
bcdDevice
Size
1
1
2
1
1
1
1
2
2
2
Value (Hex)
12
01
0110
00
00
00
08
0d8c
0016
0100
14
iManufacturer
1
01
15
iProduct
1
02
16
iSerialNumber
1
00
17
bNumConfigurations
1
01
Description
Descriptor length
Device descriptor
USB 1.1 compliant
Device class specified by interface
Device subclass specified by interface
Device protocol specified by interface
Endpoint zero packet size
Vendor ID
Product ID
Device release number
Index of string descriptor that characterizes the
manufacturer
Index of string descriptor that characterizes the product
Index of string descriptor that characterizes the serial
number
Number of configuration
Configuration Descriptor
Offset
0
1
2
Field
bLength
bDescriptorType
wTotalLength
Size
1
1
2
4
bNumInterfaces
1
5
bConfigurationValue
1
6
iConfiguration
1
7
8
bmAttributes
bMaxPower
1
1
Datasheet Revision: 1.00
Page 9 / 25
Value (Hex)
Description
09
Descriptor length
02
Configuration descriptor
xxxx
Total length of data returned for this configuration
Number of interfaces supported by this Configuration:
00: Control
03
01: ISO-IN
02: INT-IN (HID)
01
Configuration value
Index of string descriptor that characterizes this
00
configuration
80
Attributes(PWRSEL=0:Bus Powered, 1:SELF Powered)
32
Maximum power consumption from bus = 100mA
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Copyright© C-Media Electronics Inc.
CM118B
Highly Integrated & Configurable USB Audio Single Chip
4. Function Description
4.1
Content Format for EEPROM (93C46)
The CM118B integrates USB transceiver, internal oscillator and regulator so that only several passive
components are necessary for the USB interface connection. Default USB descriptors are embedded in the CM118B;
therefore there is no additional design effort needed for a generic USB operation. For customized product,
customer can attach a SPI interface 93C46 EEPROM to override the embedded VID, PID and initial/max/min volume
settings. The CM118B automatically detects 93C46 existence and performs the overwrite function during power up.
Each address has 2-byte data, prefix `0x` means hex number
Address
(Hex)
0x00
0x01
0x02
0x03
0x04 ~ 0x09
0x0A
0x0B ~ 0x19
0x1A
0x1B ~ 0x29
0x2A
0x2B
0x2C
0x2D
0x2E
0x2F
0x30
0x31
0x32
Datasheet Revision: 1.00
Page 10 / 25
Description
bit[15:4] Magic Word -- 0x670X where X = bit 4, 3, 2, 1
bit[3] The value within address 0x2A, 0x2B, 0x32 is valid 1: valid 0: invalid
bit[2] reserved, should be 1
bit[1] serial number enable control 1: enable, 0: disable(default)
bit[0] reserved, should be 1
VID 2-byte
PID 2-byte
Serial number 1st byte
Serial number length
(bit15-bit8, first character)
(bit7-bit0)
Serial number 12-byte
Product string 1st byte
Product string length
(bit15-bit8, first character)
(bit7-bit0) [0x3E->30,0x40->31Char]
Product string 30-byte (default: USB Audio Device)
Manufacturer string 1st byte Manufacturer string length
(bit15-bit8, first character)
(bit7-bit0) [0x3E->30,0x40->31Char]
Manufacturer string 30-byte (default: C-Media Electronics Inc.)
bit[15: 9] DAC initial volume (7-bit, default = -10dB)
bit[8: 3] ADC initial volume (6-bit, default = 8dB)
bit[2] DAC EEPROM MAX/MIN volume valid
bit[1] ADC EEPROM MAX/MIN volume valid
bit[0] AA EEPROM MAX/MIN volume valid
bit[15:11] AA initial volume (5-bit, default = -7dB)
bit[10] Reserved, should be 0
bit[9] Boost mode 0: 22dB 1:12dB (default)
bit[8] Reserved, should be 0
bit[7] Total Power Control 1:enable, 0:disable(default)
bit[6] Reserved, should be 0
bit[5] MIC High Pass Filter
1:enable(default), 0:disable
bit[4] MIC PLL Adjust
1:enable, 0:disable(default)
bit[3] MIC BOOST
1:enable (default), 0:disable
bit[2] DAC Output Terminal property 1: Headset, 0: Speaker(default)
bit[1] HID,
1: enable (default), 0: disable
bit[0] Remote wakeup, 1:enable, 0:disable(default)
bit[15:0] DAC Minimum Volume (0xD300, DAC-Min.=-45dB, default=-37dB)
bit[15:0] DAC Maximum Volume (0x0000, DAC-Max.=0dB, default=0dB)
bit[15:0] ADC Minimum Volume(0xEA00, ADC-Min.=-22dB, default=-12dB)
bit[15:0] ADC Maximum Volume(0x1700, ADC-Max.=+23dB, default=+23dB)
bit[15:0] AA Minimum Volume (0xE900, AA-Min.=-23dB, default=-23dB)
bit[15:0] AA Maximum Volume (0x0800,AA-Max.+8dB, default=+8dB)
EE_OPTION2 Register
bit[3] Reserved, should be 0
bit[2] Reserved, should be 0
bit[1] Reserved, should be 1
bit[0] EE_Stereo, 1: stereo ADC for headset topology, 0: mono ADC for headset
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Copyright© C-Media Electronics Inc.
CM118B
Highly Integrated & Configurable USB Audio Single Chip
topology
~ END
4.2
EEPROM SPI Interface Timing Information
CS
tSKL
tSKH
tCSS
tCSH
SK
tDIS
tDIH
DI
DO(READ)
tDF
tPD1
tPD0
tDF
tSV
DO(PROG)
STATUS VALID
Symbol
Parameter
Test Condition*
Min
f SK
SK Clock Frequency
2.7V
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