CX20755 Low-Power High Definition Audio CODEC

CX20755 Low-Power High Definition Audio
CODEC
Data Sheet
General Description
Features
Conexant's CX20755 is a low-power, 102dB Signal-toNoise Ratio (SNR), High Definition (HD) audio CoderDecoder (CODEC) that delivers high-quality audio for the
mobile Personal Computer (PC) market, including
notebooks, ultrabooks, and tablets.
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Compliant with Intel's HD Audio Specification 1.0a, the
CX20755 has audio fidelity that exceeds Microsoft
desktop and notebook premium logo requirements,
including Windows 8.x. The CX20755 includes two stereo
Digital-to-Analog Converters (DACs) and Analog-toDigital Converters (ADCs), a 2.8W stereo class-D, a
capless headphone, an integrated headset, digital
microphones, and an integrated hardware Equalizer (EQ)/
Dynamic Range Compression (DRC).
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By combining these hardware features with Conexant's
extensive voice and speech processing algorithms, the
CODEC is the ideal solution for platforms that need
Microsoft Lync, Skype, and Automatic Speech
Recognition (ASR) certification.
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Applications
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Notebooks
Ultrabooks
Desktop and all-in-one PCs
Tablets
Embedded applications
HD Audio Specification 1.0a
Windows XP/Vista/7/8.x
Microsoft Premium Logo
Linux
Android
01/08/15
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System Compatibility
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Two pairs of independent DACs and ADCs
Independent sampling rates for DACs and ADCs—
supports audio formats ranging from 16-bit to 24-bit,
44.1kHz to 192kHz for DAC, and 44.1kHz to 96kHz for
ADC
2.8WRMS per channel class-D stereo speaker amplifier
with spread spectrum
SpeakerShield technology provides load-based
speaker protection independent of driver and
application—Protection includes Direct Current (DC),
short, near-short, and temperature
Five-band hardware EQ/DRC
ProCoustic capless stereo headphone driver delivers
32mW into 32 load with no pops
Built-in four-conductor headset jack support with inline command sensing
Hum noise is prevented on external powered speakers
plugged into the headset jack when the system is off
One jack supports headsets, headphones, external
microphones, and external line-in devices
Digital Microphone Interface (DMIC) with boost
supporting two digital microphone elements and DC
offset removal
Record security prevents unwanted recordings from all
or selected input ports
Analog and digital PC Beep are supported, and Wakeon-beep never misses a beep—even when in lowpower mode
Multiple General Purpose Input/Outputs (GPIOs) for
custom applications
Integrated Low Drop-Outs (LDOs)
Headphone limiter supports GS Mark EN50332-2
without an external Bill Of Materials (BOM)
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CX20755 Data Sheet
Revision History
Revision History
Document No.
Release Date Change Description
004-55DSR02
01/08/15
Added 1.8V HD link signaling support.
004-55DSR01
08/13/14
Updated "Features."
004-55DSR00
08/05/14
Initial release.
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CX20755 Data Sheet
Table of Contents
Table of Contents
General Description.......................................................................................................................................................i
Applications ...................................................................................................................................................................i
System Compatibility ....................................................................................................................................................i
Features..........................................................................................................................................................................i
Revision History ...........................................................................................................................................................ii
Introduction...................................................................................................................................................................1
Overview............................................................................................................................................................................... 1
CX20755 Audio CODEC Features....................................................................................................................................... 2
System Compatibility .......................................................................................................................................................... 3
Hardware Qualification Process (HQP).............................................................................................................................. 3
Hardware Interface .......................................................................................................................................................4
General ................................................................................................................................................................................. 4
High Definition (HD) Audio Host Interface .................................................................................................................. 4
Control Signals ........................................................................................................................................................... 4
Audio Signals.............................................................................................................................................................. 4
CX20755 Block Diagram...................................................................................................................................................... 5
Pin Assignments and Signal Definitions........................................................................................................................... 6
Absolute Maximum Ratings.............................................................................................................................................. 12
Electrical Characteristics.................................................................................................................................................. 13
Device Performance Specifications................................................................................................................................. 14
Power Management and Power Consumption................................................................................................................ 17
Power Management.................................................................................................................................................. 17
Power Supply Minimum/Maximum Ratings .............................................................................................................. 17
Power Consumption ................................................................................................................................................. 18
Integrated Low Drop-Out (LDO) Regulators ............................................................................................................. 19
Hardware Equalizer (EQ)/Dynamic Range Compression (DRC).............................................................................. 19
Digital High-Pass Filter (HPF)................................................................................................................................... 20
Alternating Current (AC) Timing Characteristics............................................................................................................ 21
Digital Microphone Interface (DMIC) ........................................................................................................................ 21
HD Audio Clocks....................................................................................................................................................... 22
Data Output and Input .............................................................................................................................................. 23
Package Dimensions and Thermal Specifications ......................................................................................................... 24
HD Audio Interface......................................................................................................................................................26
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CX20755 Data Sheet
Table of Contents
Overview............................................................................................................................................................................. 26
Verbs................................................................................................................................................................................... 27
Node ID 00: Root Node ............................................................................................................................................ 28
Node ID 01: Audio Function Group (AFG)................................................................................................................ 29
Nodes 10, 11: DAC 1, 2 Widgets.............................................................................................................................. 31
Node 12: PC Beep Generator Widget ...................................................................................................................... 32
Node 13, 14: ADC 1, 2 Widget ................................................................................................................................. 33
Node 15: Mixer Widget ............................................................................................................................................. 35
Node 16: Port A/Vendor Widget ............................................................................................................................... 36
Node 17: Port G........................................................................................................................................................ 37
Node 18: Port B Widget ............................................................................................................................................ 38
Node 19: Port D Widget............................................................................................................................................ 40
Node 1A: Port C Widget ........................................................................................................................................... 41
Node 1B: Vendor Widget—EQ and DRC Settings ................................................................................................... 42
Ordering Information..................................................................................................................................................43
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CX20755 Data Sheet
List of Figures
List of Figures
Figure 1: CX20755 Block Diagram ................................................................................................................................................... 5
Figure 2: CX20755 40-QFN Hardware Interface Signals.................................................................................................................. 6
Figure 3: CX20755 40-QFN Pad Signals.......................................................................................................................................... 7
Figure 4: Power Supply Rejection for Class-D Amplifier Output..................................................................................................... 15
Figure 5: Power Supply Rejection for Headphone Amplifier Output ............................................................................................... 15
Figure 6: Class-D Output Power vs Load (1% THD) ...................................................................................................................... 16
Figure 7: HPF Response ................................................................................................................................................................ 20
Figure 8: Digital Microphone Clock Timing Waveform.................................................................................................................... 21
Figure 9: BIT_CLK and SYNC Timing Waveforms ......................................................................................................................... 22
Figure 10: Data Output and Input Timing Waveforms .................................................................................................................... 23
Figure 11: CX20755 40-QFN Package Drawing............................................................................................................................. 24
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CX20755 Data Sheet
List of Tables
List of Tables
Table 1: CX20755 Pad Signals......................................................................................................................................................... 8
Table 2: Pad Signal Definitions......................................................................................................................................................... 9
Table 3: Absolute Maximum Ratings .............................................................................................................................................. 12
Table 4: DC Characteristics—Digital Microphone........................................................................................................................... 13
Table 5: DC Characteristics—TTL Compatible (GPIOs, SPKR_MUTE#, and MUSIC_REQ) ........................................................ 13
Table 6: Analog Performance Characteristics ................................................................................................................................ 14
Table 7: Device Power State Mapping............................................................................................................................................ 17
Table 8: DC Supply Voltages.......................................................................................................................................................... 17
Table 9: AFG D3 Power Consumption............................................................................................................................................ 18
Table 10: Full Scale Headphone Playback (32 Load) ................................................................................................................. 18
Table 11: Full Scale Class-D Playback (1W per Channel) ............................................................................................................. 18
Table 12: Line-In Recording............................................................................................................................................................ 19
Table 13: Digital Microphone Timing Parameters........................................................................................................................... 21
Table 14: BIT_CLK and SYNC Timing Parameters ........................................................................................................................ 22
Table 15: HD Audio Output Valid Delay Timing Parameters .......................................................................................................... 23
Table 16: HD Audio Input Setup and Hold Timing Parameters ...................................................................................................... 23
Table 17: Thermal Specifications.................................................................................................................................................... 25
Table 18: Node 0 Responses ......................................................................................................................................................... 28
Table 19: Node 01 Responses ....................................................................................................................................................... 29
Table 20: Node 10 and 11 Responses ........................................................................................................................................... 31
Table 21: PC Beep Generator Responses ..................................................................................................................................... 32
Table 22: Node 13 and 14 Responses ........................................................................................................................................... 33
Table 23: Node 15 Responses ...................................................................................................................................................... 35
Table 24: Node 16 Responses ....................................................................................................................................................... 36
Table 25: Node 17 Responses ....................................................................................................................................................... 37
Table 26: Node 18 Response ......................................................................................................................................................... 38
Table 27: Node 19 Response ......................................................................................................................................................... 40
Table 28: Node 1A Responses....................................................................................................................................................... 41
Table 29: Node 1B Responses....................................................................................................................................................... 42
Table 30: CX20755 Ordering Information and Functions ............................................................................................................... 43
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CX20755 Data Sheet
Introduction
Introduction
Overview
Conexant's CX20755 is a low-power, 102dB SNR, HD audio CODEC that delivers high-quality audio for
the mobile PC market, including notebooks, ultrabooks, and tablets.
Compliant with Intel's HD Audio Specification 1.0a, the CX20755 has audio fidelity that exceeds Microsoft
desktop and notebook premium logo requirements, including Windows 8.x. With two 24-bit stereo DACs
that operate at sampling frequencies up to 192kHz and two 24-bit stereo ADCs that operate at sampling
frequencies up to 96kHz, the CODEC can support multi-streaming and RTC applications. By combining
these hardware features with Conexant's extensive voice and speech processing algorithms, the CODEC
is the ideal solution for platforms that need Microsoft Lync, Skype, and ASR certification.
The CX20755 has an integrated stereo filterless class-D amplifier with a High-Pass Filter (HPF) and
patented common mode scrambling technology capable of driving 2.8WRMS per channel into a 4 load.
Devices and speakers have load-based protection, including DC detection, short-circuit, over-current, and
over-temperature.
The tri-state, ProCoustic capless headphone driver produces a full-range frequency response and
eliminates external Field Effect Transistors (FETs) for supporting a headset jack. In-line command sensing
enables control of third-party applications directly from the headset.A single universal jack supports fixedtype headsets, headphones, external microphones, and line-in devices. A Pulse Density Modulated (PDM)
single-bit stream interface supports two digital microphones with DC offset removal for array
implementations. D3 Live allows external audio devices to play through internal speakers with full speaker
EQ/DRC while in system stand-by.
Conexant's PopShield technology eliminates pops and clicks during all transition states, and includes
active DC offset removal and an innovative Voltage reference (Vref) ramping scheme. The CX20755 has
D-Flex power management that exceeds Intel's ECR 15B requirements and consumes minimum power
during connected standby by powering down DACs, ADCs, and amplifiers without pops or clicks.
Conexant offers comprehensive audio software driver support, with both in-house and third-party software
APOs, including Andrea Electronics, Creative Labs, Dolby, DTS, Sonic Focus, MaxxAudio, Waves, and
more. Conexant’s AudioSmart voice and speech processing algorithm suite ensures clear voice
communication and speech command and control in noisy environments. The Smart Source Pickup (SSP)
does not rely on beam-forming techniques, and provides an easy to use powerful solution that requires few
or no user controls. The SSP passes the latest Intel ASR certification in all orientations with just two
microphones, and is available for Windows, Linux, and Android. AudioSmart also offers keystroke, screen
tapping, and fan noise suppression.
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CX20755 Data Sheet
CX20755 Audio CODEC Features
CX20755 Audio CODEC Features
The following lists the CX20755 audio CODEC features:
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Two pairs of independent DACs and ADCs
Independent sampling rates for DACs and ADCs—Supports audio formats ranging from 16-bit to 24bit, 44.1kHz to 192kHz for DAC, and 44.1kHz to 96kHz for ADC
2.8WRMS per channel class-D stereo speaker amplifier with spread spectrum
Five-band hardware EQ/DRC
SpeakerShield technology provides load-based speaker protection independent of driver and
application—Protection includes DC, short, near-short, and temperature
ProCoustic capless stereo headphone driver delivers 32mW into 32 load with no pops
Built-in four-conductor headset jack support with in-line command sensing
Hum noise is prevented on external powered speakers plugged into the headset jack when the system
is off
Universal jack supports headsets, headphones, external microphones, and external line-in devices
DMIC with boost supports two digital microphone elements and DC offset removal
Record security prevents unwanted recordings from all or selected input ports
Analog and digital PC Beep are supported, and Wake-on-beep never misses a beep—even when in
low-power mode
Multiple GPIOs for custom applications
Speaker mute control input selectively mutes the class-D outputs
Integrated LDOs
Headphone limiter supports GS Mark EN50332-2 without an external BOM
Integrated:
– 5V to 3.3V LDO voltage regulator for improved analog audio performance
– 3.3V to 1.8V LDO voltage regulator used to power digital blocks
1.5V, 1.8V and 3.3V HD audio link signaling levels are selectable
Pop Shield II for enhanced pop and click suppression
Jack sense detects jack events as well as enabling hardware-only selections for class-D mono mode
and port C mono mode without Basic Input/Output System (BIOS) intervention
An integrated digital mixer is used to record what is playing
D3 Live allows external audio devices to play to the internal speakers with EQ/DRC while the system is
asleep
D-Flex enhanced power management exceeds Intel ECR 15B requirements
Compliant with Intel’s HD Audio Specification 1.0a, and fidelity exceeds Vista/Windows 7/Windows 8.x
desktop and notebook Premium Logo requirements
AudioSmart super wideband voice and speech processing algorithms are available:
– End-to-end noise reduction
– Multi-band true stereo Acoustic Echo Cancellation (AEC)
– SSP
– Far Field Pickup
– ASR certification for all form factors and orientations with two microphones
Keystroke, screen tap, and fan noise suppression
10-band digital parametric SmartEQ enhances the sound quality on low-cost speakers
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CX20755 Data Sheet
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System Compatibility
Night mode boosts vocal clarity while maintaining background sound quality
Multi-band DRC further improves the sound quality and loudness of low-cost speakers and prevents
speaker rattle and distortion
Phantom bass creates virtual bass content on mainstream speakers
3D:
– Expander widens the audio stage for fuller and richer sound
– Headphone recreates a surround, speaker-like environment in headphones so users can enjoy a
richer, fuller music listening experience
AudioSmart™ GUI—Advanced audio control panel
Audio director for classic and multi-stream selections
Third-party software support includes:
– DTS, Inc.
– Dolby
– Creative Labs
– ForteMedia
– Andrea
– Waves (MaxxAudio)
Supports 32-bit/64-bit Windows OS and Linux
Available in a 40-pad, thermally-enhanced Quad Flat No-leads (QFN) package
System Compatibility
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HD Audio Specification 1.0a
Windows XP/Vista/7/8.x
Microsoft Premium Logo
Linux
Android
Hardware Qualification Process (HQP)
The Hardware Qualification Process (HQP) is intended to improve the quality and reliability of board
designs using the CX20755. The goals of this process are to:
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Eliminate common design mistakes
Ensure boards perform well and pass Driver Test Manager (DTM) fidelity requirements with good
margin
Eliminate potential manufacturing issues that may result from a marginal design
Eliminate country-specific issues
Eliminate INF problems
Converge towards standard designs
The HQP process includes review of schematics, board layout, and BOM. All boards must meet the predefined criteria. Contact the local Conexant sales office for more details about the HQP process. The HQP
process must be performed for all Original Equipment Manufacturer (OEM) designs.
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CX20755 Data Sheet
Hardware Interface
Hardware Interface
General
High Definition (HD) Audio Host Interface
The HD audio host interface conforms to Intel's HD Audio Specification 1.0a. The following lists the
supported HD audio signals:
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Bit clock (BIT_CLK), input
Frame sync (SYNC), input
Serial data output (SDATA_OUT), input
Serial data input (SDATA_IN), input/output
Master hardware reset (RESET#), input
Control Signals
The following lists the control signals that are supported from straps or the host:
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Class-D speaker mute (SPKR_MUTE#), input
Jack sense (JSENSE), input
GPIOs (GPIO0, GPIO1)
D3 Live enable, input (MUSIC_REQ)
Audio Signals
The following lists the supported audio interface signals:
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Port A (PORTA_L and PORTA_R), ProCoustic headphone output/line output, headset
Port B (PORTB_L and PORTB_R), microphone input/line input with Microphone Bias (micbias) voltage
Port C (PORTC_L and PORTC_R), analog or digital microphone input with micbias voltage
Port D (PORTD_MIC), analog headset mono microphone input
Port G (LEFT+ and RIGHT+), class-D speaker amplifier stereo/mono output
PC Speaker Beep pass-through (PC_BEEP), input
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CX20755 Data Sheet
CX20755 Block Diagram
CX20755 Block Diagram
The following figure shows a simplified block diagram of the CX20755.
HDA
Link
Interface
#SPKR_M U T E
R eset #
Port C Micbias
BIT_CLK
Port B Micbias
SYN C
14
SD I
Headset M ic In
Boost
19
AD C
SD O
Jack
Port D
D igital M icrophone
Clock
1A
Boost
D ata
Internal
13
Boost
1A
AD C
Port C
Boost
Micbias
PC Beep
18
Port B
M ic/Line In
M ic/Line In
Internal
Line In/Mic
Line In/Mic
Jack
15
2.2kW
H eadset Micbias
H eadset GND
12
Beep
1C
1B
11
EQ/DRC
16
D AC
HP Line Out
Jack
Port A
17
10
EQ/DRC
D AC
C lass-D Amp
Internal
Port G
Sense A
Figure 1: CX20755 Block Diagram
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CX20755 Data Sheet
Pin Assignments and Signal Definitions
Pin Assignments and Signal Definitions
The following figure shows the CX20755 40-QFN device signals by major interface.
8
5
4
6
9
HDA Bus Signals
40
1
GPIOs and Digital Microphone
39
SYN C
B I T_C LK
S D A T A_O U T
S D A T A_IN
R E S E T#
DMIC_CLK/MUSIC_REQ/GPIO0
DMIC_DAT/GPIO1
SPKR_MUTE#
Charge Pump Flying Cap
19
20
F LY_P
F LY_N
-2.0V or -2.6V C harge P um p B y pas s
3.3V H eadphone P ow er
21
24
AVEE
A V D D_HP
7
H D A B us S ignaling V olt age
S t andby S upply V olt age
3.3 V S upply V olt age f or D igit al
1.8V C ore R egulat or B y pas s
18
3
P C_BEEP
LE F T-
14
12
LE F T+
R I G H TR I G H T+
15
17
Class D A m p R ight C hannel S upply
Class D A m p Left C hannel S upply
Class D Ref V olt age
A udio S ignals
MICBIASB
MICBIASC
34
35
M ic bias
MUSIC_REQ/GPIO0/PORTC_L_MIC
36
CX20755
40-Pin QFN
V D D_IO
D V D D_3.3
F ILT_ 1.8
28
27
A V D D_5V
A V D D_3.3
16
13
R P W R_5.0
11
Pin 41 r efer s to
an exposed
gr ound paddle
41
Class-D Amp
22
23
30
31
32
33
P O R T A_L
P O R T A_R
PORTD_A_MIC
PORTD_B_MIC
P O R T B_L_LINE
POR T B_R_LINE
GPIO1/PORTC_R_MIC
5V-to-3.3V R egulat or I nput
5V-to-3.3V R egulat or O ut put
10
JSENSE
LP W R_5.0
C LA S S-D_REF
VREF_1.65V
37
GPIOs and Microphone
38
J ac k S ens e
29
R eferenc e V oltage
GN D
Figure 2: CX20755 40-QFN Hardware Interface Signals
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CX20755 Data Sheet
Pin Assignments and Signal Definitions
31
M IC BIA SB
PO RT B _R _L IN E
PO RT B _L_ LI NE
PORTD_B_MIC
33
32
3
4
27
26
5
6
7
8
CX20755
9
25
24
23
22
21
16
17
18
19
20
R IG H T +
DVDD_3.3
F LY _P
F L Y_ N
10
C L ASS -D _R E F
L EF T +
RE SET #
PC _B EEP
PORTD_A_MIC
VR EF _ 1.6 5V
RPWR_5.0
SD AT A_ IN
VD D _I O
S YN C
30
29
28
LPWR_5.0
L EF T R IG H T -
F I LT _1 .8V
SD AT A_ O U T
B IT _C LK
1
2
11
12
13
14
15
D MIC _ DA T / G PIO 1
VDDO_3.3
35
34
40
39
38
37
36
D M IC _C LK / M U SIC _R E Q / G PIO 0
SP KR _M U T E#
JSE N SE
G P IO 1 / P O R TC _ R_ M IC
M U SIC _R EQ / G PIO 0 / P O R T C_ L_ MI C
M IC BIA SC
The following figure and Table 1 show the CX20755 40-QFN device signals by pin number.
AV DD _ 5V
AV DD _ 3.3
HBIAS
H GN D
AV DD _ HP
PO R T A_ R
PO R T A_ L
AV EE
Figure 3: CX20755 40-QFN Pad Signals
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CX20755 Data Sheet
Pin Assignments and Signal Definitions
Table 1: CX20755 Pad Signals
Pad Number
Signal Name
Pad Number
Signal Name
1
2
DMIC_DAT/GPIO1
21
AVEE
VDDO_3.3
22
PORTA_L
3
FILT_1.8V
23
PORTA_R
4
SDATA_OUT
24
AVDD_HP
5
BIT_CLK
25
HGND
6
SDATA_IN
26
HBIAS
7
VDD_IO
27
AVDD_3.3
8
SYNC
28
AVDD_5V
9
RESET#
29
VREF_1.65V
10
PC_BEEP
30
PORTD_A_MIC
11
CLASS-D_REF
31
PORTD_B_MIC
12
LEFT+
32
PORTB_L_LINE
13
LPWR_5.0
33
PORTB_R_LINE
14
LEFT-
34
MICBIASB
15
RIGHT-
35
MICBIASC
16
RPWR_5.0
36
MUSIC_REQ/GPIO0/PORTC_L_MIC
17
RIGHT+
37
GPIO1/PORTC_R_MIC
18
DVDD_3.3
38
JSENSE
19
FLY_P
39
SPKR_MUTE#
20
FLY_N
40
DMIC_CLK/MUSIC_REQ/GPIO0
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CX20755 Data Sheet
Pin Assignments and Signal Definitions
The following lists the acronyms used in Table 2:
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GND = Ground
I = Input
Ia = Input analog
Id = In Digital
IHD = Input High Definition
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O = Output
Oa = Output analog
Od = Out digital
PWR = Power
Ref = Reference
Table 2: Pad Signal Definitions
Label
Pad
Number Type
I/O
Type
Signal Name/Description
Power
VDD0_3.3
2
PWR
I
Digital Supply Voltage. 3.3V—Connect to the 3.3V system.
FILT_1.8V
3
PWR
O
Internally Regulated Digital Core Supply Voltage. 1.8V –5%/
10%—Connect to an external decoupling capacitor.
VDD_IO
7
PWR
I
Input/Output Signaling Voltage Supply. Determines the
signaling voltage that is being used on the host system. When
VDD_IO is:
• 1.5V, the device uses 1.5V signaling on the HDA interface
pins
• 1.8V, the device uses 1.8V signaling on the HDA interface
pins
• 3.3V, the device uses 3.3V signaling on the HDA interface
pins
LPWR_5.0
13
PWR
I
Supply Voltage for Class-D Amplifier, Left Channel. 5V—
Connect to RPWR_5.0. Connect LPWR_5.0/RPWR_5.0, and
then to the 5V system supply.
RPWR_5.0
16
PWR
I
Supply Voltage for Class-D Amplifier, Right Channel. 5V—
Connect to LPWR_5.0. Connect LPWR_5.0/RPWR_5.0, and
then to the 5V system supply.
DVDD_3.3
18
PWR
I
Charge Pump Input Supply Voltage. 3.3V—Connect to the
3.3V system.
FLY_P
19
PWR
Ref
Charge Pump Negative Transfer Charge. Connected to FLY_N
through a 1μF capacitor.
FLY_N
20
PWR
Ref
Charge Pump Negative Transfer Charge. Connected to FLY_P
through a 1μF capacitor.
AVEE
21
PWR
O
Internally Generated Analog Negative Supply. –2.0V –10%/
15%—Connect to an external decoupling capacitor.
AVDD_HP
24
PWR
I
Supply Input Voltage for Headphone Amplifiers. 3.3V—
Connect to the 3.3V system.
AVDD_3.3
27
PWR
O
Output Voltage from LDO. 3.3V –5%/10%—Connect to an
external decoupling capacitor.
AVDD_5V
28
PWR
I
Analog Supply Input Voltage for LDO. 5V—Connect to the 5V
system supply.
HGND
25
GND
GND
Headset Ground: Ground sense for headsets.
GND
41
GND
GND
CODEC Ground. Thermal/electrical GND paddle of the device.
Connect to the system and audio ground.
Ground (GND)
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CX20755 Data Sheet
Label
Pin Assignments and Signal Definitions
Pad
Number Type
I/O
Type
Signal Name/Description
4
IHD
Serial Data Output. Serial input data stream from an HDA
controller.
• Reset state = Low
• Standard load = 50pF
HD Audio Interface
SDATA_OUT
I
Connect to SDATA_OUT through 33Ω.
BIT_CLK
5
I
IHD
Bit Clock. 24MHz serial data input bit clock from the HDA link.
Connect to BIT_CLK.
SDATA_IN
6
I/O
IHD
Serial Data Input. Serial output data stream to the HDA
controller. Functions as an input during CODEC initialization.
Controller has a weak pull-down resistor to prevent spurious
events in electrically noisy environments. Connect to SDATA_IN
through 33Ω.
SYNC
8
I
IHD
Frame Sync. 48kHz fixed rate sample HDA sync input.
Synchronization pulse from an HDA compliant controller to all of
the HDA compliant CODECs on the link. This signal is nominally
a 0.167μs wide pulse that is used to synchronize the HDA.
• Reset state = Low
• Standard load = 50pF
SYNC is derived from dividing BIT_CLK by 500. Connect to
SYNC.
RESET#
9
I
IHD
Master Hardware Reset. Active low HDA link reset signal. The
minimum width of this pulse must be 100μs. Connect directly to
RESET.
Reference Voltage Connections
CLASSD_REF
11
REF
Ref
Class-D Amplifier Reference Voltage. Connect to the
RPWR_5.0/LPWR_5.0 voltage supply through an external
capacitor.
VREF_1.65V
29
REF
Ref
Analog Reference Voltage. 1.65V –6%/12%—Connect to an
external decoupling capacitor.
DMIC_DAT/GPIO1
1
I/O
Id/Od Multi-purpose I/O Pin. Use:
• DMIC_DAT for the microphone data input when Port C is
configured for the digital microphone.
• GPIO1 for GPIO applications
MUSIC_REQ/GPIO0/
PORTC_L_MIC
36
I/O
Id/Od Multi-purpose I/O Pin. Use:
• MUSIC_REQ to enable the D3 Live mode
• GPIO0 for GPIO applications
• PORTC_L_MIC for the microphone left input when Port C is
configured for analog microphone input
GPIO1/
PORTC_R_MIC
37
I/O
Id/Od Multi-purpose I/O Pin. Use:
• GPIO1 for GPIO applications
• PORTC_R_MIC for microphone right input when Port C is
configured for analog microphone input
SPKR_MUTE#
39
I
Id
GPIOs
Class-D Speaker Mute. External control input to mute class-D
speakers. Active low. Optional.
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CX20755 Data Sheet
Pin Assignments and Signal Definitions
Label
Pad
Number Type
I/O
Type
DMIC_CLK/
MUSIC_REQ/GPIO0
40
I/O
Id/Od Multi-purpose I/O Pin. Use:
• DMIC_CLK for microphone clock input when Port C is
configured for a digital microphone
• MUSIC_REQ to enable the D3 Live mode
• GPIO0 for GPIO applications
10
I
Ia
PC Speaker Beep Pass-through. Input. Logic-level BEEP signal
needs to be AC-coupled to this pin. The default gain setting is:
• –28dB on the speakers
• –46dB on the headphone
LEFT+
12
O
Oa
Class-D Amplifier Output, Left Channel, Positive.
LEFT-
14
O
Oa
Class-D Amplifier Output, Left Channel, Negative.
RIGHT-
15
O
Oa
Class-D Amplifier Output, Right Channel, Negative.
RIGHT+
17
O
Oa
Class-D Amplifier Output, Right Channel, Positive.
PORTA_L
22
O
Oa
Headphone Output/Line Output, Left Channel. A ProCoustic
(capless) headphone output.
PORTA_R
23
O
Oa
Headphone Output/Line Output, Right Channel. A ProCoustic
(capless) headphone output.
PORTD_A_MIC
30
I
Ia
Headset Microphone Input. Mono microphone input for
headsets.
PORTD_B_MIC
31
I
Ia
Microphone Ground. Tie to ground through a 1μF capacitor.
PORTB_L_LINE
32
I
Ia
Microphone Input/Line Input, Left Channel. With micbias
voltage.
PORTB_R_LINE
33
I
Ia
Microphone Input/Line Input, Right Channel. With micbias
voltage.
MICBIASB
34
REF
Ref
Micbias Voltage for Port B.
MICBIASC
35
REF
Ref
Micbias Voltage for Port C.
HBIAS
26
REF
Ref
Micbias for Headset Port D.
MUSIC_REQ/GPIO0/
PORTC_L_MIC
36
I/O
I/Oa
Microphone Input/Line Input, Left Channel. With micbias
voltage.
GPIO1/
PORTC_R_MIC
37
I/O
I/Oa
Microphone Input/Line Input, Right Channel. With micbias
voltage.
JSENSE
38
I/O
I/Oa
Jack Sense Input.
Signal Name/Description
Audio Digital Signals
PC_BEEP
Audio Analog Signals
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CX20755 Data Sheet
Absolute Maximum Ratings
Absolute Maximum Ratings
The following table lists the device's absolute maximum ratings.
Table 3: Absolute Maximum Ratings
Parameter
Symbol
Limits
Units
Supply Voltage
DVDD_3.3/VDDO_3.3
3.6
V
VDD_IO
AVDD_HP
AVDD_5V
RPWR_5.0/LPWR_5.0
3.6/1.651
3.6
5.5
5.5
Digital Input Voltage
Vind
–0.7 to 4
V
Analog Input Voltage
Vina
–0.7 to 4
V
DC Clamp Current, Input
Iik
+20
mA
DC Clamp Current, Output
Iok
+20
mA
Storage Temperature Range
Tstg
–55 to 125
°C
Operating Temperature Range
Top
0 to 70
°C
1 = Depends on the HD audio signaling level.
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CX20755 Data Sheet
Electrical Characteristics
Electrical Characteristics
The following table lists the electrical characteristics for the DMIC.
Table 4: DC Characteristics—Digital Microphone
Parameter
Symbol
Minimum
Typical
Maximum
Units
Notes
Input Voltage Low
VIL
–0.3
-
0.35 x VDDO_3.3
V
-
Input Voltage High
VIH
0.65 x VDDO_3.3
-
3.3
V
-
Output Voltage Low
VOL
-
-
0.4
V
-
Output Voltage High
VOH
VDDO_3.3 - 0.4
-
-
V
-
Drive Strength
-
0.3
4
6.8
mA
Adjustable
Note:
–
–
Test conditions unless otherwise stated:
■ VDDO_3.3 = 3.3 ± 0.165 VDC
■ TA = 0°C to 70°C
Input load 20μA (weak pull-down)
The following table lists the device’s DC characteristics for the TTL-compatible I/Os.
Table 5: DC Characteristics—TTL Compatible (GPIOs, SPKR_MUTE#, and MUSIC_REQ)
Parameter
Symbol
Minimum
Typical
Maximum
Units
Notes
Input Voltage
VIN
-
-
4
V
-
Input Voltage Low
VIL
–0.5
-
0.8
V
-
Input Voltage High
VIH
2
-
Vdd+0.5
V
-
Output Voltage Low
VOL
0
-
0.4
V
-
Output Voltage High
VOH
2.4
-
Vdd
V
-
GPIO Output Sink Current at 0.4V
Maximum
-
-
-
12
mA
-
GPIO Output Source Current at 2.97V
Minimum
-
-
-
12
mA
-
GPIO Rise/fall Time
-
-
-
4
ns
25% to 75%
Note: Test conditions unless otherwise stated:
–
–
VDDO_3.3 = 3.3 ± 0.165 VDC
TA = 0°C to 70°C
–
External load = 50pF
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CX20755 Data Sheet
Device Performance Specifications
Device Performance Specifications
The tables and graphs in this section illustrate the device’s analog performance.
Table 6: Analog Performance Characteristics
Parameter
Minimum Typical
Maximum Units
Full Scale Output Voltage
-
1
-
VRMS
Headphone Output
Dynamic Range (Measured with –60dBFS Signal Present)
-
99
-
dBFS
Total Harmonic Distortion Plus Noise (THD+N), Measured at –3dBFS
-
–86
-
dB
Channel Crosstalk
-
–75
-
dBFS
Analog Frequency Response (±3dB at 20Hz, ±1dB at 20000Hz)
20
-
20000
Hz
Full Scale Output Voltage (into 4)
-
4
2.90
-
Vp
VRMS
Class-D Speaker Amplifier Outputs
Dynamic Range (Measured with –60dBFS Signal Present)
-
94
-
dBFS
THD+N, Measured at –3dBFS
-
–65
-
dBFS
Analog Frequency Response (±3dB at 20Hz, ±1dB at 20000Hz)
20
-
20000
Hz
Efficiency (Measured at 1W/Ch)
-
85
-
%
Full Scale Input Voltage
1
-
-
VRMS
Line Inputs
Dynamic Range (Measured with –60dBFS Signal Present)
-
92
-
dBFS
THD+N, Measured at –3dBFS
-
–87
-
dB
Channel Crosstalk
-
–84
-
dBFS
Analog Frequency Response (±3dB at 200Hz, ±1dB at 20000Hz)
20
-
20000
Hz
Input Resistance—0dB
-
15.8
-
k
Input Capacitance
-
5
-
pF
Full Scale Input Voltage with:
20dB boost
Boost off
0.1
1
-
-
VRMS
-
Microphone Inputs
Dynamic Range (Measured with –60dBFS Signal Present)
-
91
-
dBFS
THD+N, Measured at –3dBFS
-
–87
-
dBFS
Channel Crosstalk (Measured at 1kHz, 0dB Gain)
-
–84
-
dBFS
Analog Frequency Response (±3dB at 200Hz, ±1dB at 20000Hz)
100
-
20000
Hz
15.8
5
-
k
-
5
-
pF
Input Resistance
0dB
10dB–40dB
Input Capacitance
-
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CX20755 Data Sheet
Device Performance Specifications
Figure 4: Power Supply Rejection for Class-D Amplifier Output
Figure 5: Power Supply Rejection for Headphone Amplifier Output
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CX20755 Data Sheet
Device Performance Specifications
Class-D Output Power vs Load (1% THD)
Output Power (W)
2.500
2.000
1.500
1.000
0.500
0.000
4
5
6
7
8
9
10
11
12
Load (Ω)
Figure 6: Class-D Output Power vs Load (1% THD)
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CX20755 Data Sheet
Power Management and Power Consumption
Power Management and Power Consumption
Power Management
Advanced power management features allow the device to conserve additional power by disabling/
enabling individual functional blocks.
Table 7: Device Power State Mapping
Device State
System State
Wake-up Time
Description
D0
S0
-
Device is in full power.
D1, D2
S0-Idle
1ms
Lower power standby (LP1). Transition time to full power is 1ms.
D3
S0-Idle
10ms
75ms
Lowest power standby (LP2). Transition time to full power is
10ms, and an additional 75ms for full fidelity.
D4
S3
200ms
Standby, prepare for shutdown. Transition time to full power
200ms.
D4
S4
200ms
Hibernate, prepare for shutdown. Transition time to full power
200ms.
Power Supply Minimum/Maximum Ratings
The following table shows the required voltages at the various supply input pins of the devices.
Table 8: DC Supply Voltages
Parameter
Symbol
Minimum
Typical
Maximum
Units
Notes
Digital Voltage Supply
VDDO_3.3
3.165
3.3
3.465
V
-
Charge Pump Supply
DVDD_3.3
3.165
3.3
3.465
V
-
HDA Bus Signaling Supply, 3.3V
VDD_IO
3.165
3.3
3.465
V
-
HDA Bus Signaling Supply, 1.8V
VDD_IO
1.71
1.8
1.89
V
-
HDA Bus Signaling Supply, 1.5V
VDD_IO
1.425
1.5
1.575
V
-
Class-D Amp Supply, Left Channel
LPWR_5.0
4.75
5
5.25
V
-
Class-D Amp Supply, Left Channel
RPWR_5.0
4.75
5
5.25
V
-
Headphone Voltage Supply
AVDD_HP
3.165
3.3
3.465
V
-
5V-to-3.3V Regulator Input
AVDD_5V
4.75
5
5.25
V
-
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CX20755 Data Sheet
Power Management and Power Consumption
Power Consumption
Test conditions for the nominal device are at 25oC. The tables in this section provide the power
consumption parameters.
Table 9: AFG D3 Power Consumption
Bit_CLK
Power Rail (V)
No BIT_CLK
mA
mW
mA
mW
AVDD_5V
5
0.3
1.5
0.5
2.4
AVDD_HP
3.3
0
0
0
0.1
SPKPWR
5
0.6
3.1
0.5
2.5
VDDO_3.3
3.3
4.1
13.5
0.9
3
VDD_IO
3.3
0.3
1
0
0
DVDD_3.3
3.3
0
0
0.1
Total Power Consumption (mW)
0.2
19.1
8.1
Table 10: Full Scale Headphone Playback (32 Load)
Play 0dB Sine Wave to Capless HP
Power Rail (V)
mA
mW
AVDD_5V
5
7.2
35.8
AVDD_HP
3.3
30.7
101.4
SPKPWR
5
0.5
2.5
VDD_IO
3.3
20.5
67.7
VDDIO_3.3
3.3
0.2
0.5
DVDD_3.3
3.3
40.4
133.4
Total Power Consumption (mW)
341.4
Table 11: Full Scale Class-D Playback (1W per Channel)
Play 0dB Sine Wave to Class-D (1W)
Power Rail (V)
mA
mW
AVDD_5V
5
14.3
71.7
AVDD_HP
3.3
0
0
SPKPWR
5
473.3
2366.5
VDDO_3.3
3.3
20.5
67.7
VDD_IO
3.3
0.2
0.5
DVDD_3.3
3.3
0.9
2.9
Total Power Consumption (mW)
2509.4
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CX20755 Data Sheet
Power Management and Power Consumption
Table 12: Line-In Recording
Line-In Record from Port B
Power Rail (V)
mA
mW
AVDD_5V
5
8.8
43.9
AVDD_HP
3.3
0
0
SPKPWR
5
0.5
2.5
VDDO_3.3
3.3
18.9
62.4
VDD_IO
3.3
0.4
1.2
DVDD_3.3
3.3
0.1
0.2
Total Power Consumption (mW)
110.2
Integrated Low Drop-Out (LDO) Regulators
The devices feature the following two integrated LDO voltage regulators:
•
•
5V to 3.3V regulator = Although the output of this voltage regulator (AVDD_3.3) can be used to power
external circuitry (e.g., low-power analog), external current consumption from the regulator should be
limited to no more than 30mA. Additionally, caution should be used when powering external circuitry,
and use filtering (e.g., ferrite bead plus capacitor) to prevent the external circuitry from adding noise to
the AVDD_3.3 voltage rail.
3.3V to 1.8V regulator = The output of this voltage regulator (FILT_1.8) can also be used to power
external circuitry (e.g., discrete logic).
Hardware Equalizer (EQ)/Dynamic Range Compression (DRC)
Five-band EQ/DRC is normally used in the class-D path to protect and equalize the performance of the
typically small speakers found in notebooks. The five-channel EQ is implemented with five bi-quad filters
that are programmable. The hardware DRC helps to get maximum loudness from speakers while
preventing distortion. Easy-to-use tuning tools are available on request.
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CX20755 Data Sheet
Power Management and Power Consumption
Digital High-Pass Filter (HPF)
The device features a hardware digital HPF that is intended to be applied to the DAC that is mapped to the
class-D speaker port (assumed to drive external amplifier or powered speakers). The HPF is enabled and
set to 120Hz by default. The cut-off frequency can be adjusted from 30Hz to 1890Hz in 30Hz increments.
The purpose of this high-pass is to prevent audio content with a significant DC offset from heating and
possibly damaging speakers. Audio content with a large DC component can easily be found in homemade
movies and Internet sites.
Figure 7: HPF Response
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CX20755 Data Sheet
Alternating Current (AC) Timing Characteristics
Alternating Current (AC) Timing Characteristics
Digital Microphone Interface (DMIC)
The CX20755 DMIC consists of a clock and a data pin. The digital microphone clock pin provides a
3.072MHz (default) or 1.536MHz clock to the digital microphone. The digital microphone data pin is an
input, accepting multiplexed PDM data from the digital microphone. Figure 8 illustrates the timing
waveforms, and Table 13 lists the timing parameters.
Note: For a list of qualified digital microphones, contact a Conexant Sales FAE.
T su
Th
DMIC_CLK
T
DMIC_DATA
Left Mic Data
Dmic_clk_period
Left Mic Data
Right Mic Data
Right Mic Data
Figure 8: Digital Microphone Clock Timing Waveform
Table 13: Digital Microphone Timing Parameters
Parameter
Symbol
Minimum
Typical
Maximum
Units
DMIC_CLK Frequency1
-
3.0689
3.072
3.0751
MHz
DMIC_CLK Period
TDmic_clk_period
325.19
325.52
325.85
ns
DMIC_CLK Transition Period @ 50pF2
-
-
-
4
ns
DMIC_CLK Transition Period @ 20pF2
-
-
-
1.9
ns
DMIC_CLK Transition Period @ 7pF2
-
-
-
1
ns
DMIC_DATA Setup Time
Tsu
-
36
-
ns
DMIC_DATA Hold Time
Th
0
-
-
ns
1 = Worst case duty cycle restricted to 40/60.
2 = Measured between 25% and 75% full scale.
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CX20755 Data Sheet
Alternating Current (AC) Timing Characteristics
HD Audio Clocks
The BIT_CLK signal is a 24MHz clock that is sourced from the HD audio controller and connected to all
CODECs on the link. Figure 9 and Table 14 show the HD audio clock waveforms and timing parameters.
T clk_low
BIT_CLK
T clk_high
T clk_period
SYNC
Tsync_high
T sync_period
Figure 9: BIT_CLK and SYNC Timing Waveforms
Table 14: BIT_CLK and SYNC Timing Parameters
Parameter
Symbol
Minimum
Typical
Maximum
Units
BIT_CLK Frequency
-
23.9976
24
24.0024
MHz
BIT_CLK Period
Tclk_period
41.363
41.67
41.971
ns
BIT_CLK Output Jitter
-
-
150
500
Ps
BIT_CLK High Pulse Width1,2
Tclk_high
18.75
-
22.91
ns
BIT_CLK Low Pulse Width1,2
Tclk_low
18.75
-
22.91
ns
SYNC Frequency3
-
-
48
-
kHz
SYNC Period
Tsync_period
-
20.8
-
μs
SYNC High Pulse Width
Tsync_high
-
4 x Tclk_period -
μs
1 = 47.5pF–70pF external load.
2 = Worst-case duty cycle restricted to 40/60.
3 = The SYNC frequency is equal to the BIT_CLK frequency, divided by 500.
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CX20755 Data Sheet
Alternating Current (AC) Timing Characteristics
Data Output and Input
Figure 10 illustrates the data output and input waveforms, and Table 15 and Table 16 list the timing
parameters.
BIT_CLK
T setup
T hold
T hold
SDATA_OUT
T co
SDATA_IN
Figure 10: Data Output and Input Timing Waveforms
Table 15: HD Audio Output Valid Delay Timing Parameters
Parameter
Symbol
Minimum
Typical
Maximum
Units
Output Valid Delay from Rising Edge of BIT_CLK
Tco
3
-
11
ns
Note:
–
–
The timing is for SDATA and SYNC outputs with respect to BIT_CLK at the device driving the
output.
50pF external load.
Table 16: HD Audio Input Setup and Hold Timing Parameters
Parameter
Symbol
Minimum
Typical
Maximum
Units
Input Setup at Both Rising and Falling Edge of BIT_CLK
Tsetup
5
-
-
ns
Input Hold at Both Rising and Falling Edge of BIT_CLK
Thold
5
-
-
ns
Note:
–
–
The timing is for SDATA and SYNC inputs with respect to BIT_CLK at the device latching the
input.
The CX20755 does not impose a maximum value on the system.
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CX20755 Data Sheet
Package Dimensions and Thermal Specifications
Package Dimensions and Thermal Specifications
The following figure shows the package drawing for the device.
Figure 11: CX20755 40-QFN Package Drawing
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CX20755 Data Sheet
Package Dimensions and Thermal Specifications
The following table defines the thermal specifications.
Table 17: Thermal Specifications
Parameter
Symbol
Minimum Typical
Maximum Units
Notes
Theta-JA (Junction-to-Ambient JA
Thermal Resistance)
-
36.2
-
o
Four-layer PCB with solid
ground plane and thermal vias
(still air).
Psi-JT (Junction-to-Package
JT
Top Thermal Characterization
Parameter)
-
0.39
-
o
Four-layer PCB with solid
ground plane and thermal vias
(still air).
C/W
C/W
Note: Measurements per JEDEC EIA/JESD 51. The JA of application boards with more than four
layers stay the same or improve if the PCB construction is similar to the JEDEC EIA/JESD 51 defined
four-layer PCB (2S2P plus vias).
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CX20755 Data Sheet
HD Audio Interface
HD Audio Interface
Overview
The HD audio interface is a five-pin interface:
•
•
•
•
•
Clock (BIT_CLK)
Serial data in (SDATA_IN)
Serial data out (SDATA_OUT)
SYNC
RESET#
The clock is provided by the controller at a frequency of 24MHz. Because the SDATA_OUT signal is
provided by the controller and contains data for every edge of the 24MHz clock, the CX20755 must sample
data on both rising and falling edges of SDATA_OUT.
The SYNC signal not only signals the beginning of the 500 clock frame, it designates the beginning of the
data for each stream and indicates which stream of data is to be on SDATA_OUT next (streams do not
need to appear in order; the controller may do as it likes). Channels are another way of organizing the
serial data. Each stream has at least one channel. Each stream must start with channel 0 and proceed
without interruption until all the assigned channels are exhausted. A stereo pair takes two adjacent
channels.
The SDATA_IN signal contains the CX20755 data headed towards the controller, and is only generated on
rising edges. This includes information read from the HD audio registers, ADC, and incoming modem data.
The stream and channel are indicated before the data is transmitted on SDATA_IN (refer to Intel’s HD
Audio Specification 1.0a for the format). The SDATA_IN signal is responsible for knowing the device
number, which is the CODEC Address (CAd) in Intel’s HD Audio Specification 1.0a. During the last clock of
the first sync after a Power-on Reset (PoR), the SDATA_IN is driven high by the CX20755 for one clock
cycle. This indicates to the controller the need for a CAd. The CX20755 then stops driving the SDATA_IN
signal, and the controller begins to drive it. The controller drives SDATA_IN high through the next sync,
and the CAd is assigned by the number of clocks after the fall of sync that it takes for the SDATA_IN to fall.
The interface then turns around again, and SDATA_IN is an output from the CX20755 until reset.
Intel’s HD Audio Specification 1.0a also contains one other concept of an unsolicited message. Unsolicited
messages can occur for a number of reasons, such as timers, ringing phones, answers from the device to
a register read, etc. Because the bus has no interrupt, these reasons are taken care of in unsolicited
messages. If the controller was not addressing the CAd assigned to the CX20755 during the previous
frame and if one of these unsolicited messages is needed (and enabled), the CX20755 uses the first
cycles after the sync on SDATA_IN to alert the controller to the event. Only one event can be signaled in a
frame.
The CX20755 only sends the message once, and does not expect any sort of acknowledgment from the
controller.
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CX20755 Data Sheet
Verbs
Verbs
This section describes how this device interacts with the verbs defined in Intel’s HD Audio Specification
1.0a. Each of the following subsections describe the verb IDs, parameters/payload, and corresponding
responses that apply to that node.
Verbs are commands and queries that are passed from the HD audio controller to the CODECs on the HD
audio bus. Responses are data passed from the HD audio CODEC to the HD audio controller. All controller
verbs must be followed by a CODEC response. Unsolicited responses from the CODEC are data
transmitted without a controller verb request.
A 1 in the:
•
•
Valid bit position indicates the Response field contains a valid response.
UnSol bit position is meaningful only when the Valid bit is set, and indicates that the response is
unsolicited rather than in reply to a verb.
The 32 actual response bits vary in format and are each documented in Intel’s HD Audio Specification
1.0a.
Note: For more information regarding the verbs, controller, CODEC commands, and control protocol,
refer to Intel’s HD Audio Specification 1.0a document.
Each node in the CODEC is addressed using a CAd that is assigned to the CODEC during initialization,
and the Node's ID (NID). The concatenation of the CAd and NID provide a unique address that allows
commands to reference a specific node within the audio subsystem.
The entire verb is formed by pre-pending the CAd and the NID to the verb ID and parameter/payload. In
this section’s tables and descriptions, the CAd and NID are not listed as part of the verb.
Register values may have up to five letters included with their default value. These letters indicate which of
the possible reset events force the register to its default value. The five letters are as follows:
•
•
•
•
•
P = Power-on reset
R = HD audio reset pin assertion
V = Single verb reset
W = Double verb reset
D = D-state change reset
Only the letters in the list force the register to its default value.
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CX20755 Data Sheet
Verbs
Node ID 00: Root Node
Table 18 defines a root note that has one Audio Function Group (AFG). This device is compliant with and
follows the guidelines given in Intel’s HD Audio Specification 1.0a and the Windows Logo Program Device
Requirements for Windows 7 and Windows 8.
Table 18: Node 0 Responses
Description
Verb ID
Parameter
Response
Default Value
Comments
Vendor ID
F00h
00h
14F15113h
-
CX20755.
Revision ID
F00h
02h
0x00100100
-
Revision B0.
Subordinate Node Count
F00h
04h
0x00010001
-
AFG.
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CX20755 Data Sheet
Verbs
Node ID 01: Audio Function Group (AFG)
The following table describes an AFG.
Table 19: Node 01 Responses
Description
Verb ID
Parameter
Response
Default Value
Comments
Subordinate Node Count 0xF00
0x04
0x0010000D
-
•
•
Starting node = 10
Node count = 13
Function Group
0xF00
0x05
0x00000101
-
•
•
AFG
Unsolicited capable
AFG Capabilities
0xF00
0x08
0x00010F0F
-
•
Sample delay in and out
is 16
PC Beep generation
•
PCM Size and Rate
0xF00
0x0A
0x000E0160
-
•
•
16-bit and 24-bit
44.1kHz, 48kHz, and
96kHz
PCM Format
0xF00
0x0B
0x00000001
-
PCM only.
Supported Power States 0xF00
0x0F
0xE000001F
-
EPSS, clock stop, D0, D1,
D2, D3, and D4.
GPIO Count
0xF00
0x11
0xC0000002
-
Two GPIOs, unsolicited
message, and wake.
Get Power State
0xF05
0x00
0x00000abc
0x00000633 (P,W) • a = Settings reset
• b = Actual state
• c = Requested state
The settings reset is cleared
by this verb or any write to
this node.
Set Power State
0x705
0x0a
0x00000000
-
Get Unsolicited
0xF08
0x00
0x000000aa
0x00000000 (P,W) aa = Unsolicited enable and
tag.
Set Unsolicited
0x708
0xaa
0x00000000
-
Get GPIO Data
0xF15
0x00
0x000000aa
0x00000000 (P,W) aa = GPIO data.
a = Requested state.
aa = Unsolicited enable and
tag.
Set GPIO Data
0x715
0xaa
0x00000000
-
Get GPIO Enable
0xF16
0x00
0x000000aa
0x00000000 (P,W) aa = GPIO enable.
aa = GPIO data.
Set GPIO Enable
0x716
0xaa
0x00000000
-
Get GPIO Direction
0xF17
0x00
0x000000aa
0x00000000 (P,W) aa = GPIO direction.
Set GPIO Direction
0x717
0xaa
0x00000000
-
Get GPIO Wake
0xF18
0x00
0x000000aa
0x00000000 (P,W) aa = GPIO wake.
Set GPIO Wake
0x718
0xaa
0x00000000
-
Get GPIO UM Enable
0xF19
0x00
0x000000aa
0x00000000 (P,W) aa = Unsolicited message
enable.
Set GPIO UM Enable
0x719
0xaa
0x00000000
-
Get GPIO Sticky Mask
0xF1A
0x00
0x000000aa
0x00000000 (P,W) aa = Sticky mask.
Set GPIO Sticky Mask
0x71A
0xaa
0x00000000
-
aa = GPIO enable.
aa = GPIO direction.
aa = GPIO wake.
aa = Unsolicited message
enable.
aa = Sticky mask.
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CX20755 Data Sheet
Verbs
Table 19: Node 01 Responses (Continued)
Description
Verb ID
Parameter
Response
Default Value
Comments
Get Default Config
0xF1C–
0xF1F
0x00
0xaabbccdd
0x00000000 (P)
•
•
•
•
Set Default Config 1
0x71C
0xaa
0x00000000
-
aa = Config1.
Set Default Config 2
0x71D
0xaa
0x00000000
-
aa = Config2.
Set Default Config 3
0x71E
0xaa
0x00000000
-
aa = Config3.
Set Default Config 4
0x71F
0xaa
0x00000000
-
aa = Config4.
Get Subsystem ID
0xF20–
0xF23
0x00
0xaaaabbcc
0x14F10101 (P)
•
•
•
Set Subsystem ID 1
0x720
0xaa
0x00000000
-
aa = Assembly ID.
Set Subsystem ID 2
0x721
0xaa
0x00000000
-
aa = SKU ID.
Set Subsystem ID 3
0x722
0xaa
0x00000000
-
aa = Subsystem ID low byte.
Set Subsystem ID 4
0x723
0xaa
0x00000000
-
aa = Subsystem ID high byte.
Soft Reset
0x7FF
0x00
0x00000000
-
-
aa = Config4
bb = Config3
cc = Config2
dd = Config1
aaaa = Subsystem ID
bb = SKU ID
cc = Assembly ID
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CX20755 Data Sheet
Verbs
Nodes 10, 11: DAC 1, 2 Widgets
The following table describes a stereo DAC that supports 16-bit, 20-bit, and 24-bit widths, and 44.1kHz,
48kHz, 96kHz, and 192kHz sample rates.
Table 20: Node 10 and 11 Responses
Description
Verb ID
Parameter
Response
Default Value
Comments
Get Converter Format 0xA
0x0000
0x0000aaaa
0x00000031 (P,W) aaaa = Converter format.
Set Converter Format 0x2
0xaaaa
0x00000000
-
Get Amp Gain
0xB80
0xBA0
0x00
0x00
0x000000aa
0x0000004A (P,W) •
•
aa = Right gain
aa = Left gain
Set Amp Gain
0x390
0x3A0
0x3B0
0xaa
0x00000000
-
•
•
•
aa = Right gain
aa = Left gain
aa = Right and left gain
Audio Widget DAC
0xF00
0x09
0x00000C1D
-
DAC—analog.
PCM Size and Rate
0xF00
0x0A
0x000A0060
0x000A0560
0x000A0060
•
aaaa = Converter format.
•
16-bit and 24-bit, 44.1kHz
and 48kHz
96kHz and 192kHz
PCM Format
0xF00
0x0B
0x00000001
-
PCM only.
Supported Power
States
0xF00
0x0F
0x8000000F
-
EPSS, D0, D1, D2, and D3.
Get Output Amp
Capabilities
0xF00
0x12
0x80034A4A
-
•
Get Power State
0xF05
0x00
0x00000abc
0x00000433 (P,W) • a = Settings reset
• b = Actual state
• c = Requested state
The settings reset is cleared by
this verb or any write to this
node.
Set Power State
0x705
0x0a
0x00000000
-
a = Requested state.
Get Converter
Stream/Channel
0xF06
0x00
0x000000ab
0x00000000
(P, R, V, W, D)
•
•
a = Stream
b = Channel position
Set Converter
Stream/Channel
0x706
0xab
0x00000000
-
•
•
a = Stream
b = Channel position
Get EAPD
0xF0C
0x00
0x0000000a
0x00000000 (P,W) a = Left/right swap.
Set EAPD
0x70C
0x0a
0x00000000
-
•
Mute, 1dB step, step 74 is
0dB
74 of 80 steps are exposed
a = Left/right swap.
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CX20755 Data Sheet
Verbs
Node 12: PC Beep Generator Widget
Table 21 describes a beep generator. PC beep is mixed in with all enabled output ports while in D0. When
the PC beep input pin is connected but inactive, while not toggling no system noise is injected on the
output pins. If the PC beep input is left unconnected, there is no impact on the performance of the output
ports.
This is a mono widget. Only the left channel volume request is valid. Any request, read, or write with the
right channel is ignored and returns 0x00000000. If both left and right are present in the request, only the
value from the left side is used.
The beep gain level range (–4dB to –32dB) is for the speaker port. The default setting is –28dB on the
speaker, and –46dB on the headphone.
Table 21: PC Beep Generator Responses
Description
Verb ID Parameter
Response
Default Value
Comments
Get Amp Gain
0xBA0
0x00
0x0000000a
0x00000001 (P,W) aa = Left gain.
Set Amp Gain
0x3A0
0x3B0
0xaa
0x00000000
-
•
•
Audio Widget PC Beep 0xF00
0x09
0x0070000C
-
PC Beep generator with an
output amp.
Get Output Amp
Capabilities
0xF00
0x12
0x000F0707
-
4dB step, eight steps, and step
8 is –4dB.
Get Beep Generation
Control
0xF0A
0x00
0x000000aa
0x00000000 (P,W) aa = Divider.
Set Beep Generation
Control
0x70A
0xaa
0x00000000
-
aa = Left gain
aa = Left gain
aa = Divider.
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CX20755 Data Sheet
Verbs
Node 13, 14: ADC 1, 2 Widget
Table 22 describes a stereo ADC that supports 16-bit and 24-bit widths, and 44.1kHz, 48kHz, and 96kHz
sample rates. The ADC has a gain stage and a stereo one-of-four input selector.
Table 22: Node 13 and 14 Responses
Description
Verb ID
Parameter
Response
Default Value
Comments
Get Converter Format
0xA
0x0000
0x0000aaaa
0x00000031 (P,W) aaaa = Converter format.
Set Converter Format
0x2
0xaaaa
0x00000000
-
Get Index 0 Amp Gain 0xB00
0xB20
0x00
0x000000aa
0x000000aa
0x0000004A (P,W) •
•
aa = Right gain
aa = Left gain
Get Index 1 Amp Gain 0xB00
0xB20
0x01
0x000000aa
0x000000aa
0x0000004A (P,W) •
•
aa = Right gain
aa = Left gain
Get Index 2 Amp Gain 0xB00
0xB20
0x02
0x000000aa
0x000000aa
0x0000004A (P,W) •
•
aa = Right gain
aa = Left gain
Get Index 3 Amp Gain 0xB00
0xB20
0x03
0x000000aa
0x000000aa
0x0000004A (P,W) •
•
aa = Right gain
aa = Left gain
Set Index 0 Amp Gain
0x350
0x360
0x370
0xaa
0x00000000
-
•
•
•
aa = Right gain
aa = Left gain
aa = Left and right gain
Set Index 1 Amp Gain
0x351
0x361
0x371
0xaa
0x00000000
-
•
•
•
aa = Right gain
aa = Left gain
aa = Left and right gain
Set Index 2 Amp Gain
0x352
0x362
0x372
0xaa
0x00000000
-
•
•
•
aa = Right gain
aa = Left gain
aa = Left and right gain
Set Index 3 Amp Gain
0x353
0x363
0x373
0xaa
0x00000000
-
•
•
•
aa = Right gain
aa = Left gain
aa = Left and right gain
Audio Widget ADC
0xF00
0x09
0x00100D1B
-
ADC—analog.
PCM Size And Rate
0xF00
0x0A
0x000A0160
-
16-bit and 24-bit/44.1kHz,
48kHz, and 96kHz.
PCM Format
0xF00
0x0B
0x00000001
-
PCM only.
Input Amp Capabilities 0xF00
0x0D
0x8003504A
-
Mute, 1dB step, 80 steps, and
step 74 is 0dB.
Connection Length
0xF00
0x0E
0x00000004
0x00000003
-
•
•
Supported Power
States
0xF00
0x0F
0x8000000F
-
EPSS, D0, D1, D2, and D3.
Get Connection Select 0xF01
0x00
0x0000000a
0x00000000 (P,W) a = Connection index.
Set Connection Select 0x701
0x0a
0x00000000
-
a = Connection index.
Get Connection List
0x00
0x1E191A18
0x1A151E19
0x00151E19
-
•
•
•
0xF02
aaaa = Converter format.
Connected to 4
Node 14 reduces to three
connections if node 1A is
an analog stereo
Node 13
Node 14
Node 14 reduces to three
connections if node 1A is
an analog stereo
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CX20755 Data Sheet
Verbs
Table 22: Node 13 and 14 Responses (Continued)
Description
Verb ID
Parameter
Response
Default Value
Comments
Get Power State
0xF05
0x00
0x00000abc
0x00000433 (P,W) • a = Settings reset
• b = Actual state
• c = Requested state
The settings reset is cleared
by this verb or any write to this
node.
Set Power State
0x705
0x0a
0x00000000
-
a = Requested state.
Get Converter Stream/ 0xF06
Channel
0x00
0x000000ab
0x00000000
(P, R, V, W, D)
•
•
a = Stream
b = Channel position
Set Converter Stream/ 0x706
Channel
0xab
0x00000000
-
•
•
a = Stream
b = Channel position
Get EAPD
0xF0C
0x00
0x0000000a
0x00000000 (P,W) a = Left/right swap.
Set EAPD
0x70C
0x0a
0x00000000
-
a = Left/right swap.
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CX20755 Data Sheet
Verbs
Node 15: Mixer Widget
Table 23: Node 15 Responses
Description
Verb ID
Parameter Response
Default Value
Comments
Get Index 0 Amp Gain
0xB00
0xB20
0x00
0x000000aa
0x000000aa
0x00000000 (P,W) •
•
a = Right gain
a = Left gain
Get Index 1 Amp Gain
0xB00
0xB20
0x01
0x000000aa
0x000000aa
0x00000000 (P,W) •
•
a = Right gain
a = Left gain
Set Index 0 Amp Gain
0x350
0x360
0x370
0xaa
0x00000000
-
•
•
•
a = Right gain
a = Left gain
a = Left and right gain
Set Index 1 Amp Gain
0x351
0x361
0x371
0xaa
0x00000000
-
•
•
•
a = Right gain
a = Left gain
a = Left and right gain
Audio Widget Mixer
0xF00
0x09
0x0020050B
-
Mixer with an input amplifier.
Input Amp Capabilities
0xF00
0x0D
0x80034A4A
-
Mute, 1dB step, 74 steps, and
step 74 is 0dB.
Connection Length
0xF00
0x0E
0x00000002
-
Connected to 2.
Supported Power States
0xF00
0x0F
0x8000000F
-
EPSS, D0, D1, D2, and D3.
Get Connection List
0xF02
0x00
0x00001110
-
Connected to DAC 1, DAC 2.
Get Power State
0xF05
0x00
0x00000abc
0x00000433 (P,W) • a = Settings reset
• b = Actual state
• c = Requested state
The settings reset is cleared
by this verb or any write to this
node.
Set Power State
0x705
0x0a
0x00000000
-
a = Requested state.
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CX20755 Data Sheet
Verbs
Node 16: Port A/Vendor Widget
The following table describes a pin that has selectable headphone or line drive and supports jack sensing.
Table 24: Node 16 Responses
Description
Verb ID Parameter Response
Default Value
Comments
Audio Widget Pin
0xF00
0x09
0x00400581
0x00F00000
-
•
•
•
Get Pin Capabilities
0xF00
0x0C
0x0000001C
-
Output, HP, jack sense.
Connection Length
0xF00
0x0E
0x00000002
-
Connected to 2.
Supported Power
States
0xF00
0x0F
0x8000000F
-
EPSS, D0, D1, D2, and D3.
Get Connection
0xF01
0x00
0x0000000a
0x00000000 (P,W) DAC 1 selected.
Set Connection
0x701
0x0a
0x00000000
-
•
•
Get Connection List
0xF02
0x00
0x00001110
-
DAC 1, 2.
Get Power State
0xF05
0x00
0x00000abc
0x00000433 (P,W) • a = Settings reset
• b = Actual state
• c = Requested state
The settings reset is cleared by
this verb or any write to this node.
Set Power State
0x705
0x0a
0x00000000
-
Get Pin Control
0xF07
0x00
0x000000a0
0x000000C0 (P,W) a = Headphone and output
enable.
Set Pin Control
0x707
0xa0
0x00000000
-
Get Unsolicited
Response
0xF08
0x00
0x000000aa
0x00000000 (P,W) aa = Unsolicited enable and tag.
Set Unsolicited
Response
0x708
0xaa
0x00000000
-
aa = Unsolicited enable and tag.
Get Pin Sense
0xF09
0x00
0xa0000000
-
•
•
•
a = Presence detect
8 = Present
0 = Missing
Get Default Config
0xF1C– 0x00
0xF1F
0xaabbccdd
0x0421401F (P)
•
•
•
•
aa = Config4
bb = Config3
cc = Config2
dd = Config1
Set Default Config 1
0x71C
0xaa
0x00000000
-
aa = Config1.
Set Default Config 2
0x71D
0xaa
0x00000000
-
aa = Config2.
Set Default Config 3
0x71E
0xaa
0x00000000
-
aa = Config3.
Set Default Config 4
0x71F
0xaa
0x00000000
-
aa = Config4.
Pin—analog
Vendor widget
Universal jack mode
0 = DAC 1
1 = DAC 2
a = Requested state.
a = Headphone and output
enable.
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CX20755 Data Sheet
Verbs
Node 17: Port G
The following pin accepts a stereo signal and drives stereo speakers.
Table 25: Node 17 Responses
Description
Verb ID Parameter Response
Default Value
Comments
Audio Widget Pin
0xF00
0x09
0x00400501
-
Pin—analog.
Get Pin Capabilities
0xF00
0x0C
0x00000010
-
Output.
Connection Length
0xF00
0x0E
0x00000002
-
Connected to 2.
Supported Power
States
0xF00
0x0F
0x8000000F
-
EPSS D0, D1, D2, and D3.
Get Connection
0xF01
0x00
0x0000000a
0x00000000 (P,W) DAC 1 selected.
Set Connection
0x701
0x0a
0x00000000
-
•
•
Get Connection List
0xF02
0x00
0x00001110
-
Connected to DAC 1, 2.
Get Power State
0xF05
0x00
0x00000abc
0x00000433 (P,W) • a = Settings reset
• b = Actual state
• c = Requested state
The settings reset is cleared by this
verb or any write to this node.
Set Power State
0x705
0x0a
0x00000000
-
Get Pin Control
0xF07
0x00
0x000000a0
0x00000040 (P,W) a = Output enable.
Set Pin Control
0x707
0xa0
0x00000000
-
a = Output enable.
Get Default Config
0xF1C– 0x00
0xF1F
0xaabbccdd
0x90170010 (P)
•
•
•
•
Set Default Config 1
0x71C
0xaa
0x00000000
-
aa = Config1.
Set Default Config 2
0x71D
0xaa
0x00000000
-
aa = Config2.
Set Default Config 3
0x71E
0xaa
0x00000000
-
aa = Config3.
Set Default Config 4
0x71F
0xaa
0x00000000
-
aa = Config4.
0 = DAC 1
1 = DAC 2
a = Requested state.
aa = Config4
bb = Config3
cc = Config2
dd = Config1
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CX20755 Data Sheet
Verbs
Node 18: Port B Widget
Table 26 describes a stereo input pin that can be configured to be a line input or a microphone input. There
is a microphone boost control and micbias. This pin supports jack sensing.
Table 26: Node 18 Response
Description
Verb ID Parameter Response
Default Value
Comments
Get Amp Gain
0xB00
0xB20
0x00
0x000000aa
0x000000aa
0x00000000 (P,W) •
•
aa = Right gain
aa = Left gain
Set Amp Gain
0x350
0x360
0x370
0xaa
0x00000000
-
•
•
•
aa = Right gain
aa = Left gain
aa = Left and right gain
Audio Widget Pin
0xF00
0x09
0x0040048B
0x0040058B
-
•
•
Pin—analog
Connection list (universal jack
mode)
Get Pin Capabilities
0xF00
0x0C
0x00000024
0x0000003C
0x00001124
0x0000113C
No bias
Merge mode
Bias mapped
HP and bias
•
•
•
•
Input, jack sense
In/out, jack sense
Vref, Input, jack sense
Everything above
Input Amp
Capabilities
0xF00
0x0D
0x002F0300
-
12dB step, four steps, and step 0
is 0dB.
Connection Length
0xF00
0x0E
0x00000002
Merge mode
Connected to 2.
Supported Power
States
0xF00
0x0F
0x8000000F
-
EPSS, D0, D1, D2, and D3.
Get Connection
0xF01
0x00
0x0000000a
0x00000000 (P,W) •
•
DAC 1 selected
Merge mode only
Set Connection
0x701
0x0a
0x00000000
-
•
•
•
0 = DAC 1
1 = DAC 2
Merge mode only
Get Connection List
0xF02
0x00
0x00001110
-
•
•
DAC 1, 2
Merge mode only
Get Power State
0xF05
0x00
0x00000abc
0x00000433 (P,W) • a = Settings reset
• b = Actual state
• c = Requested state
The settings reset is cleared by
this verb or any write to this node.
Set Power State
0x705
0x0a
0x00000000
-
Get Pin Control
0xF07
0x00
0x000000aa
0x00000000 (P,W) Vref, aa = Input enable output, HP
(merge mode).
Set Pin Control
0x707
0xaa
0x00000000
-
Get Unsolicited
Response
0xF08
0x00
0xaa
0x00000000 (P,W) aa = Unsolicited enable and tag.
Set Unsolicited
Response
0x708
0xaa
0x00000000
-
aa = Unsolicited enable and tag.
Get Pin Sense
0xF09
0x00
0xa0000000
-
•
•
•
a = Requested state.
Vref, aa = Input enable output, HP
(merge mode).
a = Presence detect
8 = Present
0 = Missing
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CX20755 Data Sheet
Verbs
Table 26: Node 18 Response (Continued)
Description
Verb ID Parameter Response
Default Value
Comments
Get Default Config
0xF1C– 0x00
0xF1F
0xaabbccdd
0x048130F0 (P)
•
•
•
•
aa = Config4
bb = Config3
cc = Config2
dd = Config1
Set Default Config 1 0x71C
0xaa
0x00000000
-
aa = Config1.
Set Default Config 2 0x71D
0xaa
0x00000000
-
aa = Config2.
Set Default Config 3 0x71E
0xaa
0x00000000
-
aa = Config3.
Set Default Config 4 0x71F
0xaa
0x00000000
-
aa = Config4.
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CX20755 Data Sheet
Verbs
Node 19: Port D Widget
Table 27 describes a stereo pin that can be configured to be a line input or a microphone input. There is a
microphone boost control and micbias.
Table 27: Node 19 Response
Description
Verb ID Parameter Response
Default Value
Comments
Get Amp Gain
0xB00
0xB20
0x00
0x000000aa
0x000000aa
0x00000000 (P,W) •
•
aa = Right gain
aa = Left gain
Set Amp Gain
0x350
0x360
0x370
0xaa
0x00000000
-
•
•
•
aa = Right gain
aa = Left gain
aa = Left and right gain
Audio Widget Pin
0xF00
0x09
0x0040048B
-
Pin—analog.
Get Pin Capabilities
0xF00
0x0C
0x00001124
0x00001120
Headset enabled
•
•
Input Amp Capabilities
0xF00
0x0D
0x002F0300
-
12dB step, four steps, and
step 0 is 0dB.
Supported Power States 0xF00
0x0F
0x8000000F
-
EPSS, D0, D1, D2, and D3.
Get Power State
0xF05
0x00
0x00000abc
0x00000433 (P,W) • a = Settings reset
• b = Actual state
• c = Requested state
The settings reset is cleared
by this verb or any write to this
node.
Set Power State
0x705
0x0a
0x00000000
-
Get Pin Control
0xF07
0x00
0x000000aa
0x00000000 (P,W) aa = Vref, input enable.
Set Pin Control
0x707
0xaa
0x00000000
-
Get Unsolicited
Response
0xF08
0x00
0xaa
0x00000000 (P,W) aa = Unsolicited enable and
tag.
Set Unsolicited
Response
0x708
0xaa
0x00000000
-
aa = Unsolicited enable and
tag.
Get Pin Sense
0xF09
0x00
0xa0000000
-
•
•
•
a = Presence detect
8 = Present
0 = Missing
Get Default Config
0xF1C0xF1F
0x00
0xaabbccdd
0x04A190F0 (P)
•
•
•
•
aa = Config4
bb = Config3
cc = Config2
dd = Config1
Set Default Config 1
0x71C
0xaa
0x00000000
-
aa = Config1.
Set Default Config 2
0x71D
0xaa
0x00000000
-
aa = Config2.
Set Default Config 3
0x71E
0xaa
0x00000000
-
aa = Config3.
Set Default Config 4
0x71F
0xaa
0x00000000
-
aa = Config4.
Vref, in, jack sense
Vref, in
a = Requested state.
aa = Vref, input enable.
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CX20755 Data Sheet
Verbs
Node 1A: Port C Widget
Port C is either an internal digital or analog microphone. The analog microphone has an option to send the
left channel to both a left and right, mono microphone connection. Analog microphone is the reset default.
Table 28: Node 1A Responses
Description
Verb ID Parameter Response
Default Value
Get Amp Gain
0xB00
0xB20
0x00
0x000000aa 0x00000000 (P,W) •
•
0x000000aa
aa = Right gain
aa = Left gain
Set Amp Gain
0x350
0x360
0x370
0xaa
0x00000000 -
•
•
•
aa = Right gain
aa = Left gain
aa = Left and right gain
Audio Widget Pin
0xF00
0x09
0x0040048B -
Pin—analog.
Get Pin Capabilities
0xF00
0x0C
0x00001120 0x00000020
•
•
Input Amp Capabilities
0xF00
0x0D
0x002F0300 -
12dB step, four steps, and step 0
is 0dB.
Supported Power States 0xF00
0x0F
0x8000000F -
EPSS D0, D1, D2, and D3.
Get Power State
0xF05
0x00
0x00000abc 0x00000433 (P,W) • a = Settings reset
• b = Actual state
• c = Requested state
The settings reset is cleared by
this verb or any write to this
node.
Set Power State
0x705
0x0a
0x00000000 -
Get Pin Control
0xF07
0x00
0x000000aa 0x00000000 (P,W) •
•
aa = Vref, input enable
aa = Input enable (digital
microphone mode)
Set Pin Control
0x707
0xaa
0x00000000 -
•
•
aa = Vref, input enable
aa = Input enable (digital
microphone mode)
Get Default Config
0xF1C– 0x00
0xF1F
0xaabbccdd
•
•
•
•
aa = Config4
bb = Config3
cc = Config2
dd = Config1
Set Default Config 1
0x71C
0xaa
0x00000000 -
aa = Config1.
Set Default Config 2
0x71D
0xaa
0x00000000 -
aa = Config2.
Set Default Config 3
0x71E
0xaa
0x00000000 -
aa = Config3.
Set Default Config 4
0x71F
0xaa
0x00000000 -
aa = Config4.
0x90A700F0 (P)
Comments
Analog—Vref, input
Digital—Input (digital
microphone mode)
a = Requested state.
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CX20755 Data Sheet
Verbs
Node 1B: Vendor Widget—EQ and DRC Settings
Table 29 describes a vendor-specific node. This node is used for writing and reading coefficients for the
integrated EQ/DRC engine in the CODEC. A tool is available that allows easy tuning of the EQ and the
DRC, and generates the verb tables needed for BIOS programming.
Table 29: Node 1B Responses
Description
Verb ID Parameter Response
Default Value
Get EQ Configuration
0xA
0xa000
0x00000bbb
0x00000000 (P) •
•
a = Register number
bbb = 12-bit value
0x2
0xabbb
0x00000000
-
•
•
a = Register number
bbb = 12-bit value
0xB
0xa000
0x00000bbb
0x00000000 (P) •
•
a = Register number
bbb = 12-bit value
0x3
0xabbb
0x00000000
-
•
•
a = Register number
bbb = 12-bit value
0xC
0xa000
0x00000bbb
0x00000000 (P) •
•
a = Register number
bbb = 12-bit value
0x4
0xabbb
0x00000000
-
•
•
a = Register number
bbb = 12-bit value
F00
0x09
0x00F00000
-
-
Set EQ Configuration
Audio Widget Vendor
Comments
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CX20755 Data Sheet
Ordering Information
Ordering Information
The following table shows the ordering information (device order part number and the supported
functions).
Table 30: CX20755 Ordering Information and Functions
Model/Order/Part Numbers
Supported Functions
Audio
Device
CODEC Part
Order Number Number
Revision
Audio CODEC
Package Type
Integrated Stereo
Class-D Amplifier
Number of
DACs/ADCs
CX20755-11Z
-11Z
40-QFN
Yes
4/4
CX20755
Operating
Temperature
0 to 70°C
Note: All devices are lead-free (Pb-free) and RoHS-compliant, and are compatible with leaded re-flow
processes. Contact the local Conexant Sales office for advanced software options.
www.conexant.com
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© 2015 Conexant Systems, Inc.
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