STMicroelectronics STA321MP, STA321MPL, STEVAL-MKI126 Vx, STEVAL-CCA035 V1, STEVAL-MKI138 V1, STEVAL-MKI129 V1, V2, V3, MP34DT01, MP34DB01, MP45DT02 Application note
광고
광고
AN4146
Application note
STSmartVoice demonstration board STEVAL-MKI126Vx
MEMS Digital
Microphone 1
Introduction
This application note describes the STSmartVoice demonstration board STEVAL-
MKI126Vx. The connections and setup of the programming and interface boards are also detailed as well as other versions of the main board hosting the different microphones.
The STA321MP/MPL (package option respectively VFQFPN56 and TQFP64) has been designed to decode the pulse-density modulation (PDM) signal coming from the microphones and convert it into the most common digital audio format: I
2
S. The device is also able to provide pulse-width modulation (PWM) outputs, one per channel, suitable to support an analog interface. The processor also includes a digital block, the hardware accelerator, composed of a chain of biquads (see
The STEVAL-MKI126Vx board can connect up to six microphones using the sockets provided or through a dedicated six-microphone array. The digital interface of the device allows interfacing the MIC output to the most widely used audio receivers and digital amplifiers or simply evaluating the MIC using generic audio measurement equipment. The filtered PWM signals allow the connection of a headset to listen to the audio received through the microphones.
The fully digital path ensures a high level of processing with sound preconditioning, filtering and voice enhancement. The pre- and post-mixing of the signals coming from the microphones, in combination with the frequency equalization block, allow the implementation of acoustic algorithms such as beam forming.
Figure 1. Microphone processor
MEMS Digital
Microphone 6
SDA
SCL
STA321MP/MPL
PDM
Interface
I2C
1
6
Audio
Matrix
( Muxing/
Mixing )
PLL
Scalable
Microphone
Processor TM
Hardware
Accelerator
PWM
Serial Data
Output
I
2
S
OUTxA
OUTxB
LRCK
BICK
SDAT 1/2/3
Clock management
March 2013 DocID023502 Rev 2 1/30
www.st.com
Contents
Contents
AN4146
Demonstration board and accessories . . . . . . . . . . . . . . . . . . . . . . . . . . 5
STEVAL-MKI126Vx board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
STEVAL-MKI126Vx overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
STEVAL-MIKI126Vx connections and setup . . . . . . . . . . . . . . . . . . . . . . . 9
Clock management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
MEMS microphones, PDM interface and level shifter . . . . . . . . . . . . . . 12
Selectors, jumpers and connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Microphone audio adapter connections . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Appendix A STEVAL-MKI126Vx schematics, layout and BOM . . . . . . . . . . . . . . 22
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AN4146
List of tables
List of tables
2
C writes of setup file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
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List of figures
List of figures
AN4146
Microphone audio adapter board plugged into STEVAL-MKI126
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AN4146
1
Demonstration board and accessories
Demonstration board and accessories
The STSmartVoice board STEVAL-MKI126Vx requires a dedicated interface board,
STEVAL-CCA035V1 (APWLink) or STEVAL-MKI138V1 (ST audio hub), for programming the device. Additional boards hosting the microphones are compatible with the board using suitable connectors placed onboard. These boards are listed and shown in the following sections and figures.
1.1 Interface
I
The STEVAL-CCA035V1 works as a programming board since it manages writing to the
2
C. The microphone processor is a digital device set using the I
2
C commands. In addition, the STEVAL-CCA035V1 also serves as an interface board since the I
2
S provided by the processor is routed on its connector (referred to as the APWLink connector). Finally, this board also provides on the connector the 12.288 MHz clock used by the processor in case the sampling frequency of the I
2
S is 192 kHz or 48 kHz.
Figure 2. STEVAL-CCA035V1 (APWLink)
The STEVAL-MKI138V1 performs the functions listed above plus supports audio streaming via the USB cable. Basically the ST audio hub, using the STM32F107RC microcontroller, is able to program the STA321MPL device via the I
2
C and decodes the I
2
S into a USB stream in order for the PC to manage the sound captured by the microphones.
Figure 3. STEVAL-MKI138V1 (ST audio hub)
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Demonstration board and accessories AN4146
The main task of the STEVAL-MKI126Vx in
is to convert the PDM signals provided
by the microphones both into the more common I
2
S and PWM. The I
2
S signal is routed both on a general connector and APWLink connector. The PWM signals, properly filtered, provide an analog interface. There are two different versions of the board depending on the microphones soldered onboard:
•
STEVAL-MKI126V1: MP45DT02 devices have been soldered
•
STEVAL-MKI126V3: MP34DT01 devices have been soldered
Figure 4. STEVAL-MKI126Vx
6/30
Microphone adapters are small circular PCBs with a single soldered MEMS microphone.
There are three different ordering codes for each board corresponding to the different type of mounted digital microphone (STEVAL-MKI129V1 for the MP34DT02, STEVAL-MKI129V2 for the MP34DB01, and STEVAL-MKI129V3 for the MP34DT01. Please refer to AN4184
“Microphone coupon boards STEVAL-MKI129Vx based on the MP45DT02, MP34DB01, and MP34DT01” for further details.
Figure 5. MP34DT01 microphone adapter board
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AN4146 Demonstration board and accessories
Figure 6. STEVAL-MKI126Vx - block diagram
Array connector
STEVAL-MKI126V
3.3V
Vdd
Clk
L/R gnd
MIC3 MIC4 MIC5 MIC6
Vdd Vdd Vdd
Out Clk
L/R gnd
Out Clk
L/R gnd
Out Clk
L/R gnd
Out
S6 S7
J3
S8 S9
J4
S3
Vdd
Clk
L/R
Out gnd
MIC1
S5
SW1
SW2
Vdd
Clk
L/R gnd
Out
MIC2
S4
3.3V
S2 JP1
Regulator
1.8V
Regulator
3.3V
3.3V
S12 S13 S14 S15 S16 S17
3.3V
Level shifter
High
3.3V
Low
1.8V
3.3V
Flip-flop
/2
/4
PDM Interface
CK
STA321MPL
I2C
PWM
I2S
(3x)
OpAmp
LRCK
BICK
SDO12
SDO34
SDO56
S1
S10 S11
HP Jack
I
2
S connector
+3.3V
Gnd +5V
11.2896MHz
APWlink connector
The board hosts the homonymous microphone processor STA321MP or MPL according to the package.
It also includes two voltage regulators in order to provide the required voltages. One regulator generates 3.3 V for supplying both the processor and the microphone and the other one generates 1.8 V in case the user desires to supply the microphones at this voltage.
For the reason above, there is also a voltage level shifter that must be used if the microphones and the processor are fed with different voltages.
Another important section is represented by the clock. The board hosts an oscillator in order to provide the clock to the processor. The device is able to generate the clock for the microphones (default clock-out value / 4), but a flip-flop has been introduced for dividing the STA321MP clock out for a debugging purposes; the flip-flop during normal use is bypassed.
The input section is represented by the two soldered microphones, the four microphone
sockets and the 8x2 header connector for the microphone array. The board has been
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Demonstration board and accessories AN4146
designed for automatically switching from the microphones onboard to the microphones on the array thanks to two voltage-controlled switches SW1 and SW2.
The output section is represented by an I
2
S connector that exports the I
2
S bus and a headphone amplifier, TS482, which also allows a digital-to-analog path. These two paths allow interfacing the microphones to, respectively, a generic audio processor or measurement equipment or to interface the MEMS to a PC.
I
A further component is the APWLink connector that allows the control of the processor via
2
C. This connector also provides a 3.3 V source line and I
2
S signals.
All selectors have their own name on the board serigraphy and are composed of two resistors where only one is soldered according to the desired functionality.
depicts all the components listed and the different colored traces represent the
following sections of the board:
•
Power supply (green trace)
•
Clock management (black trace)
•
PDM interface (rainbow traces)
•
Output sections
– Headphone out (fuchsia trace)
– I
2
S signals (fuchsia trace)
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AN4146
1.5
Demonstration board and accessories
STEVAL-MIKI126Vx connections and setup
The figure below represents the placement of the component and the selectors, made up of resistors, which manage all the possible configurations and signals paths supported by the demonstration board.
Figure 7. STEVAL-MKI126Vx placement and serigraphy
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Demonstration board and accessories AN4146
S3
The STA321MP processor needs 3.3 V as a supply voltage while the operative voltage range of the microphones is 1.64 V - 3.6 V where the typical value is 1.8 V. For this reason there are two voltage regulators onboard. One regulator is used to generate the 3.3 V from an external 5 V supply (J20) while the other one generates the 1.8 V from the 3.3 V. The
3.3 V can also be provided from the APWLink connector on pin 11 and enabled on the board by closing JP1. In spite of the fact that the STEVAL-CCA035V1 board is always connected
(for the I
2
C communication) and so 3.3 V is always provided to the STEVAL-MKI126Vx, the demonstration board also hosts the 3.3 V regulator (scaled by an external 5 V supply) to allow better noise immunity. The following diagram depicts the supply lines scheme: S2
(R78-R79) selects the 3.3 V source while S3 (R80-R81) selects either 1.8 V or 3.3 V as the microphone supply voltage. These selectors are indicated on the board with the serigraphy
3V3 SEL and MIC_VCC, respectively.
Figure 8. Power supply - block diagram subsection
S2 JP1
APWlink connector
Regulator
1.8V
Regulator
3.3V
+3.3V
Gnd +5V
Once the 3.3 V voltage supply has been chosen, the devices that are fed with this voltage are the STA321MP, the flip-flop, the level shifter and the opamp. Regarding the microphones section, the selector S3 offers the possibility to choose their supply level.
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AN4146 Demonstration board and accessories
Clock management is an important topic since all of the devices involved have their own clock.
Figure 9. Clock management - block diagram subsection
Microphones
Clock
S10 S11
3.3V
Level shifter
High
3.3V
Low
1.8V
3.3V
3.3V
Flip-flop
/2
/4
PDM Interface
CK
STA321MPL
S1
APWlink connector
11.2896MHz
The processor device needs two clocks: one for its digital core and one for the PDM (a register bit allows selecting the ratio between the two clocks). The microphones and the
PDM interface need the same clock while the processor core clock is fed with a quadruple of such clock. The core clock can be provided to the processor through the STEVAL-
CCA035V1, 12.288 MHz on pin 15, or thanks to an onboard 11.2896 MHz oscillator, the selector S1 (R82-R83) is used to select one of these two clocks. The choice of the frequency value depends on the desired output sampling frequency of the I
2
S:
•
12.288 MHz: Fs = 12.288/64 = 192 kHz
→ Fs = 48 kHz enabling I
2
S decimator
•
11.2896 MHz: Fs = 11.2896/64 = 176.4 kHz
→ Fs =44.1 kHz enabling I
2
S decimator
The clock for the microphones and PDM interface is generated thanks to the PLL enabling the device microphone mode (refer to the STA321MP datasheet) and exported thanks to the clock-out (pin 25). The PDM interface is internally clocked by enabling one bit of a dedicated device register. If the microphone mode is not enabled, the external flip-flop is used as a frequency divider of the clock-out; this is for a debugging purposes only. For this reason, the
I/F_CLK pin stays open by not soldering it to R32.The clock routing is managed by the two selectors S10, S11 called MIC_CLK_SEL on the board serigraphy. In microphone mode, the
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Demonstration board and accessories AN4146
clock-out works exactly as the microphone clock, so it must be provided to the microphone pins. This is done by closing the resistor R43 of the selector S11 (R42-R43). In the case of supplying the microphones at 1.8 V, the clock provided to the microphones must be reduced from 3.3 V to 1.8 V. The level shifter provides this scaled clock, if needed. When the user wants to feed the microphones at 1.8 V, the resistor R42 of the selector S11 must be soldered instead of R43 (R42-R43).The selector S10 (R40-R41) is used when the microphone mode is not enabled, thus, for debugging purposes only. For this reason, both of its resistors are not soldered.
L/R
GND
VDD
Table 1. L/R channel selection
Clock low
Data valid
High impedance
Clock high
High impedance
Data valid
Since the STA321MP processor manages the channels separately, there is no need to set the microphone in stereo configuration in this demonstration board. The L/R pins can be set to either GND or VDD through the selectors S4, S5, S6, S7, S8 and S9 (respectively the couples R38-R39, R36-R37, R46-R47, R44-R45, R48-R49 and R50-R51). By default, all the L/R pins are connected to GND, in other words R36, R38, R44, R46, R48 and R51 are soldered.
The processor STA321MP samples the microphone data according to the PDM interface clock. The sampling edge can be set to both rising and falling since, in microphone mode, the processor provides an internal PDM interface clock shifted 90º with respect to the clockout. Refer to the STA321MP/MPL datasheet for details.
The data output is a digital signal carrying the audio information with a PDM encoding. The processor STA321MP is able to decode these signals and convert them into the more common I
2
S and PWM. The I
2
S signal is routed both on a general connector and APWLink connector; the PWM signals, suitably filtered, provide an analog interface (fuchsia traces in
).
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AN4146 Demonstration board and accessories
Figure 10. Microphones and I/O interfaces - block diagram subsection
Array connector
3.3V
Vdd
Clk
L/R gnd
MIC3 MIC4 MIC5 MIC6
Vdd Vdd Vdd
Out Clk
L/R gnd
Out Clk
L/R gnd
Out Clk
L/R gnd
Out
S6 S7
J3
S8 S9
J4
3.3V
3.3V
Vdd
Clk
L/R
Out gnd
MIC1
S5
SW1
SW2
Vdd
Clk
L/R
Out gnd
MIC2
S4
3.3V
S12 S13 S14 S15 S16 S17
3.3V
Level shifter
High
3.3V
Low
1.8V
PDM Interface
STA321MPL
PWM
I2S
(3x)
OpAmp
LRCK
BICK
SDO12
SDO34
SDO56
HP Jack
I
2
S connector
APWlink connector
The inputs of the PDM interface depend on the group of selectors S12, S13, S14, S15, S16 and S17 called Data Level SEL (respectively the couples R64-R65, R70-R71, R66-R67,
R72-R73, R68-R69 and R74-R75). These selectors are set if the PDM inputs come from the microphones or from the level shifter.
The level shifter (enabled through the level shifter EN) is used when the microphones supply voltage is set to 1.8 V. Under this condition the sensors are a 1.8 V section while the decoder is still a 3.3 V section. In order to match these two board portions, a level shifter is needed to increase the PDM data output level before providing it to the processor.
In a default configuration the PDM inputs are directly connected to the microphones data, in other words R65, R67, R69, R71, R73 and R75 are soldered.
Microphones 1 and 2 are always connected since they are soldered on the board
(a)
, the other four inputs depend on the connection of the microphone adapter boards. If the user wants to use the external microphone array, the microphone adapter boards must be unplugged and then the user must connect the array to the array connector with the dedicated cable. When the array is plugged in, pin 2 of the array connector is forced to a. Regarding MIC1 and MIC2, the board can host every type of ST digital microphone since it supports all the footprints
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Demonstration board and accessories AN4146
ground (due to the array board schematic) and this trace is used to switch off the LED D1 and to control the voltage-controlled switches SW1 and SW2 (IC1 and IC2 on the STEVAL-
MKI126Vx board). The LED switching off indicates that the array is connected and the switches commutate the PDM input 1 and 2 from the data of the microphones onboard to the data of the microphones on the array.
The output section is simply represented by a connector that exports the I
2
S bus (J17) and an operational amplifier used as the headphone driver. The STA321MP includes a PWM modulator so it possible to export this signal and after a suitable filtering (refer to
an analog signal is obtained. This dual output option allows interfacing the microphones to both a digital processor (through the I
2
S interface) and to analog systems like the PC line in
(filtered output).
Figure 11. Headphone out schematic - only one channel
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AN4146
2
Selectors, jumpers and connectors
Selectors, jumpers and connectors
2.1 Selectors and jumpers
Name on block diagram
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
DEBUGGING
PURPOSES ONLY
S12
Table 2. Selectors and jumpers
Serigraphy
MCK_Sel
3V3 SEL
MIC_VCC
LR_H/L
LR_H/L
MIC CLK SEL
MIC CLK SEL
Data Level SEL
Function
Core clock selection:
R82: Coming from APWLink connector
R83: Coming from on-board oscillator
3.3 V selection:
R78: External supply needed
R79: Coming from APWLink connector
Microphone supply voltage:
R80: 3.3 V
R81: 1.8 V
Microphone 2 L/R:
R38: GND
R39: Vdd
Microphone 1 L/R:
R36: GND
R37: Vdd
Microphone 3 L/R:
R46: GND
R47: Vdd
Microphone 4 L/R:
R44: GND
R45: Vdd
Microphone 5 L/R:
R48: GND
R49: Vdd
Microphone 6 L/R:
R50: Vdd
R51: GND
Microphone clock voltage level:
R42: 1.8 V
R43: 3.3 V
Microphone clock voltage level:
R40: 1.8 V
R41: 3.3 V
PDM1 selection:
R64: when microphones are 1.8 V supplied
R65: when microphones are 3.3 V supplied
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Selectors, jumpers and connectors AN4146
Table 2. Selectors and jumpers (continued)
Name on block diagram Serigraphy Function
S13
S14
S15
S16
S17
Data Level SEL
Data Level SEL
Data Level SEL
Data Level SEL
Data Level SEL
PDM2 selection:
R70: when microphones are 1.8 V supplied
R71: when microphones are 3.3 V supplied
PDM3 selection:
R66: when microphones are 3.3 V supplied
R67: when microphones are 3.3 V supplied
PDM4 selection:
R72: when microphones are 1.8 V supplied
R73: when microphones are 3.3 V supplied
PDM5 selection:
R68: when microphones are 1.8 V supplied
R69: when microphones are 3.3 V supplied
PDM6 selection:
R74: when microphones are 1.8 V supplied
R75: when microphones are 3.3 V supplied
JP1
Table 3. Jumpers and further options - summary table
Name on block diagram
Serigraphy Function
J3-J4
3V3 APW
TWIN3-TWIN2
Level shifter EN
PLL_Bypass
3V3 from APWLink board enable:
Closed: 3V3 from APWLink
Open: line open
Reserved
Level shifter enable:
Pin 1: GND device is disabled
Pin 3: 1.8 V device is enabled
PLL bypass or not:
R76: PLL is bypassed
R77: PLL not bypassed
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AN4146 Selectors, jumpers and connectors
Connecting the microphone audio adapter boards is very simple. The STEVAL-MKI126Vx board hosts four groups of three female headers like those depicted in the figure below. The
J12, J25 and J26 group can host one of the three different types of microphone audio adapters
Figure 12. Female headers on STEVAL-MKI126Vx board
shows the connection of the audio adapter board for the MP34DT01. It’s also possible to cut one of the microphones and use a single small circular PCB, allowing the evaluation of a different type of digital microphone at the same time.
Figure 13. Microphone audio adapter board plugged into STEVAL-MKI126
(STSmartVoice demonstration board)
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Software settings AN4146
The demonstration board is programmed using the PC interface board STEVAL-CCA035V1
(APWLink) or STEVAL-MKI138Vx (ST audio hub). The figure below shows the connection using the APWLink connector (J15).
Figure 14. Interface board connection
To program the microphone processor STA321MP/MPL, the APWorkbench tool is needed.
Follow these steps to correctly set up the device:
1.
Run the tool
2. Click on the "MEMS Microphones Demo Kit" button
3. Select “STSmartVoice Demo Kit” in the “Microphone Kit Selection” box
4. Click on the "Run selected application…" button
Figure 15. APWorkbench launch wizard
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AN4146 Software settings
The selection of the application allows the user to access all supported configurations of the
STSmartVoice board. The kit will work as a microphone onboard manager by selecting the
"Multi-microphone interface" choice. Then the user must confirm by clicking on the "Apply selected configuration" button.
Figure 16. APWorkbench tool
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Software settings AN4146
The selection of the kit as a "Multi-microphone interface" will perform the I
2
C writes given in the table below.
Address
00
02
0A
0B
0C
0E
0F
04
07
08
5D
81
Value
9B
20
00
54
54
48
48
18
7A
80
01
09
Table 4. I
2
C writes of setup file
Note
PDM interface enable
20: FS = XTI/256.
Example:
44.1 kHz = 11.2896 MHz/256
48 kHz = 12.288 MHz/256
Ch4/5 Binary
Remove Soft Volume
Bridge power-UP
Master volume 0 dB
Ch1: +6 dB
Ch2: +6 dB
Ch4: +12 dB
Ch5: +12 dB
Microphone mode
Output I
2
S interface pins set as output
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AN4146 Software settings
The selection of the kit as a "Multi-microphone interface" also lets the user access the dedicated panel given in the figure below.
Figure 17. Multi-microphone interface panel
The user can route the signal of the desired microphone on the output interfaces (I
2
S or HP out) using the mapping drop-down menus on the right side of the panel. These menus act on the pre-mixer of the respective channel. In the default configuration of the I
2
S output data
1 and 2 (SDO12), the pre-mixer of channel 1 takes 100% of PDMIN_1 (MIC1) and channel
2 takes 100% of PDMIN_2 (MIC2). The user can also directly edit the mixer values at will.
The post-mixer works in the same way, but takes a percentage of the outcome of the processing block.
As an example, the figure below shows the layout of the pre- and post-mixer of channel1.
Figure 18. Pre- and post-mixer of channel 1
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Appendix A STEVAL-MKI126Vx schematics, layout and BOM
Figure 19. STEVAL-MKI126Vx schematic - page 1
R79
0R0
R78
0R0 N.F.
LRCKO
BICKO
SDO_12
SDO_34
SDO_56
I/F_CLK
CKOUT/4_H
9
7
5
3
1
3V3
3V3_INT
3V3_EXT
R81
0R0 N.F.
R80
0R0
J17
6
4
2
10
8
5X2_HEADER
R32
0R0 N.F.
1
2
1V8
MIC_VCC
PWDN
3V3_INT
3V3_INT
R7
10K
1
2
C9
1nF
C17
100nF
3V3_INT
3V3_INT
I/F_CLK
C15
100nF
C1
100nF
3V3_INT
PDMIN_6
PDMIN_5
PDMIN_4
PDMIN_3
PDMIN_2
PDMIN_1
RESET
3V3_INT
1
2
MVO
3
GND
VDD3.3
4
GND
5
VDD2.5
SDI78
6
SDI56
7
SDI34
8
9
SDI12
10
LRCKI
11
BICKI
VDD3.3
12
GND
13
VDD2.5
14
15
RESET
PLLB
16
U1
SDA
SCL
XTI
R3
3.3K
1
2
C13
1nF
C14
100pF
3V3_INT
C5
100nF
C8
100nF
3V3_INT
SDO_56
SDO_34
SDO_12
LRCKO
BICKO
48
OUT2A
OUT2B
VDD2.5
47
46
GND
45
44
VDD3.3
OUT3A
43
OUT3B
42
OUT4A
41
OUT4B
40
OUT5A
39
OUT5B
38
VDD2.5
37
GND
36
VDD3.3
OUT6A
OUT6B
35
34
33
C16
100nF
3V3_INT
EAPD
R29
10k
C12
100nF
C11
100nF
3V3_INT
R14
3.9K
R15
3.9K
R16
3.9K
C43
470pF R17
3.9K
C49
220pF
R31
5k
R18
3.9K
C44
150pF R19
3.9K
3.9K
R21
3.9K
R20
470pF
C45
3.9K
R23
3.9K
R22
150pF
C46
3.9K
R25
3.9K
R24
3V3_INT
R27
10k
C51
220pF
3V3_INT
R28
10k
3V3_INT
1
OUT1
2
IN1-
3
IN1+
4
GND
HPOUT1
U10
8
VCC
IN2+
7
OUT2
IN2-
6
5
TS482
R30
5k
C47
220pF
R26
10k
HPOUT2
C48
220pF
CKOUT_H
3V3_INT
XT_ACTIVE
CSX750FBC11.2896MTR
4 3
2
2 1
2
10K
Y1
R2
1
R1
100
1
OSC_CK
EN
R83
0R0
R82
0R0 N.F.
OSC_CK
XTI
MCLK
R85
0R0
R84
0R0 N.F.
3V3_INT
EN
HPOUT1
HPOUT2
C50
220uF
C52
220uF
2
3
1
HEADPHONE O/P
J24
AN4146 STEVAL-MKI126Vx schematics, layout and BOM
Figure 20. STEVAL-MKI126Vx schematic - page 2
J20
CN-02P
1
2
+
U7
IC-LD1117V33
3
VIN
GND
VOUT
2
C26
100nF
3V3_EXT
C27
100nF C18
100nF
1V8 3V3_INT
3V3_INT
C40
10uF
+
1V8
U2
1
VIN
LDS3985XX
OUT
3
VINH
5
C39
100nF
C2
33nF
C3
1uF
+
C24
10uF
MIC_DATA1
PDMIN_2_2378
MIC_DATA3
PDMIN_4_2378
MIC_DATA5
PDMIN_6_2378
CKOUT_L
CKOUT/4_H
C19
100nF
U6
1
VL
2
I/O_VL1
3
I/O_VCC2
4
I/O_VL3
5
I/O_VCC4
6
I/O_VL5
7
I/O_VCC6
8
I/O_VL7
9
I/O_VCC8
10
GND
VCC
20
I/O_VCC1
I/O_VCC3
19
I/O_VL2
18
17
I/O_VL4
16
I/O_VCC5
15
I/O_VL6
14
I/O_VCC7
13
I/O_VL8
12
OE
11
ST23783E
1
S1
3
2
PDMIN_1_2378
MIC_DATA2
PDMIN_3_2378
MIC_DATA4
PDMIN_5_2378
MIC_DATA6
CKOUT_H
CKOUT/4_L
1V8
CKOUT_H
CKOUT/2_H
3V3_INT
U4
1
2
CLR
1D
3
1CK
4
1PR
5
1Q
6
1Q
7
GND
CK
Q
CK
Q
D
Q
D
Q
74VHC74
VDD 14
2CLR 13
2D 12
2CK 11
2PR 10
2Q 9
2Q 8
CKOUT/4_H
C23
100nF
+
JP1
JP
3V3
SCL
MUTE
SDO_12
SDO_56
BICKO
2
R5 100
1
MCLK
2
0R0 R6
1
C4
47pF
5
7
9
1
3
11
13
15
C6
10pF
J15
2
4
6
8
10
12
14
16
SDO_34
LRCKO
2
R4 100
1
RESET
PWDN
SDA
FAIL
C7
10pF
DocID023502 Rev 2 23/30
STEVAL-MKI126Vx schematics, layout and BOM
Figure 21. STEVAL-MKI126Vx schematic - page 3
On Board MIC
R37
0R0 N.F.
R36
0R0
1
U3
GND
2
LR
VDD
DOUT
6
5
MIC_VCC
C10
10uF
C20
100nF
3
GND CLK
MP45DT01
4
C29
15pF
3
4
MP34DB01
U9
VDD L/R
DATA CLK
2
1
R8
100R
C28
15pF
MIC_DATA1_BOARD
MIC_CK
R39
0R0 N.F.
R38
0R0
1
U5
GND VDD
6
2
LR DOUT
5
3
GND CLK
4
C30
15pF
MP45DT01
3
4
MP34DB01
U11
VDD L/R
DATA CLK
2
1
MIC_VCC
C21
10uF
C22
100nF
R9
100R
C31
15pF
MIC_DATA2_BOARD
MIC_CK
AN4146
3
CLK
4
DATA
U12
L/R
2
VDD
1
MP34DT01
3
CLK
4
DATA
U13
L/R
2
VDD
1
MP34DT01
On board Mic socket
MIC_DATA3
R10
MIC_CK
JP
JP3
100R
C32
15pF
J26
1
2
1
J12
2
3
CON3
C33
15pF
CON3
3
J25
1
2
CON3
3
MIC_VCC
0R0 N.F.
R47
MIC_DATA5
C36
15pF
R12
MIC_CK
100R
J32
1
C37
15pF
J14
1
2
3
CON3
CON3
2
3
J31
CON3
1
2
3
MIC_VCC
0R0 N.F.
R49
MIC_DATA4
R11
MIC_CK
100R
C34
15pF
J30
1
2
3
1
2
J28
3
C35
CON3
15pF
CON3
J29
1
CON3
2
3
MIC_VCC
R45
0R0 N.F.
MIC_DATA6
C38
15pF
R13
MIC_CK
100R
J36
1
C41
15pF
1
J34
2
3
CON3
CON3
2
3
J35
1
2
CON3
3
MIC_VCC
0R0 N.F.
R50
24/30 DocID023502 Rev 2
AN4146 STEVAL-MKI126Vx schematics, layout and BOM
Figure 22. STEVAL-MKI126Vx schematic - page 4
Mic Array / on board Mic switch
MIC_DATA1_BOARD
MIC_DATA1
MIC_DATA1_ARRAY
MIC_DATA2_BOARD
MIC_DATA2
MIC_DATA2_ARRAY
75R
R54
6 S2
5
D
4 S1
IC1
IN 1
VCC
2
GND
3
ARRAY_DET
3V3_INT
C54
100nF
6 S2
5
D
4 S1
IC-STG719
IC2
IN 1
VCC
2
GND
3
IC-STG719
J3-1
J3-2
C55
100nF
MIC_DATA3
MIC_DATA4
J4-1
J4-2
MIC_DATA5
MIC_DATA6
MIC Input Selection Indicator
ARRAY_DET
3V3_INT
Mic data level selection
Default setting : 3V3
MIC_DATA1
PDMIN_1
PDMIN_1_2378
R65
0R0
R64
0R0 N.F.
MIC_DATA3
PDMIN_3
PDMIN_3_2378
MIC_DATA5
PDMIN_5
PDMIN_5_2378
MIC_DATA2
PDMIN_2
PDMIN_2_2378
MIC_DATA4
PDMIN_4
PDMIN_4_2378
MIC_DATA6
PDMIN_6
PDMIN_6_2378
R73
0R0
R72
0R0 N.F.
R75
0R0
R74
0R0 N.F.
R67
0R0
R66
0R0 N.F.
R69
0R0
R68
0R0 N.F.
R71
0R0
R70
0R0 N.F.
MIC CLOCK SELECTION
R40
CKOUT/4_L
0R0 N.F.
MIC_CK
R41
0R0
CKOUT/4_H
R42
0R0 N.F.
R43
0R0 N.F.
CKOUT_L
MIC_CK
CKOUT_H
MIC ARRAY INTERFACE
MIC_VCC
ARRAY_DET
MIC_CK
MIC_DATA1_ARRAY
MIC_DATA2_ARRAY
MIC_DATA3
MIC_DATA4
MIC_DATA5
MIC_DATA6
9
11
13
15
5
7
1
3
10
12
14
16
6
8
2
4
J38
LED On: On board Mic
LED Off: Mic Array
DocID023502 Rev 2 25/30
STEVAL-MKI126Vx schematics, layout and BOM
Figure 23. STEVAL-MKI126Vx layout - top view
AN4146
Figure 24. STEVAL-MKI126Vx layout - bottom view
26/30 DocID023502 Rev 2
AN4146 STEVAL-MKI126Vx schematics, layout and BOM
CCAP
CCAP
CCAP
CCAP
CCAP
CCAP
CCAP
CCAP
CCAP
CCAP
TCAP
Type
CCAP
CCAP
CCAP
RES
RES
RES
RES
RES
RES
RES
Package
Table 5. STEVAL-MK126Vx bill of material
Description Qty Reference
CC0603
CC0805
CC0603
CC0603 220 pF +/-10% NPO 50 V
CC1206
CC0603
10 uF +/-10% X7R 10 V
1 nF +/-5% X7R 50 V
CC0603
CC0603
CC0603
100 nF +/-10% X7R 50 V
10 uF +/-10% X7R 10 V
18
C1 C5 C8 C11 C12
C15 C16 C17 C18
C19 C20 C22 C26
C27 C54 C55 C23
C39
2 C10 C21
15 pF +/-10% NPO 50 V 12
C28 C29 C30 C31
C32 C33 C34 C35
C36 C37 C38 C41
4 C47-49 C51
1 uF +/-10% X7R 10 V
100 pF +/-10% NPO 50 V
10 pF +/-10% NPO 50 V
4 C24 C25 C40 C42
2 C9 C13
2 C3 C53
1 C14
2 C6 C7
CC0603 47 pF +/-10% NPO 50 V
CC0603 470 pF +/-10% NPO 50 V
CC0603 150 pF +/-10% NPO 50 V
CC0603
C7343
33nF +/-5% X7R 50V
220 uf 10 V +/-10% 125°C tanatalum
1 C4
2 C43 C45
2 C44 C46
1 C2
R0603
R0603
R0603
R0603
R0603
R0603
0 ohm +/-10% 1/8W
0 ohm +/-10% 1/8W
100 ohm +/-10% 1/8W
220 ohm +/-10% 1/8W
75 ohm +/-10% 1/8W
10K ohm +/-10% 1/8W
19
R6 R36 R38 R43
R44 R46 R48 R51
R65 R67 R69 R71
R73 R75 R76 R79
R80 R82 R84
20
R32 R37 R39 R40
R41 R42 R45 R47
R49 R50 R64 R66
R68 R70 R72 R74
R77 R78 R81 R83
R85
10
R1 R4 R5 R8 R9 R10
R11 R12 R13 R33
1 R34
1 R54
6
R2 R7 R26 R27 R28
R29
R0603 3.3 k ohm +/-10% 1/8W 1 R3
Manufacturer Remark
Murata
Murata
Murata
Murata
Murata
Murata
Murata
Murata
Murata
Murata
Murata
Murata
AVX
Murata
Murata
Murata
Murata
Murata
Murata
Murata
Do not solder
DocID023502 Rev 2 27/30
STEVAL-MKI126Vx schematics, layout and BOM AN4146
Type Package
Table 5. STEVAL-MK126Vx bill of material (continued)
Description Qty Reference
RES
RES
Diode
OSC
Connector
Connector
Connector
Connector
Connector
Phonejack
Plastic supportor
Plastic supportor
IC
R0603 3.9 k ohm +/-1% 1/8W 12
R14 R15 R16 R17
R18 R19 R20 R21
R22 R23 R24 R25
2 R30 R31 R0603
D1206 SMD LED diode, red,1.8 V 1 D1
SMD5X7 CSX750FBC11.2896MTR
1 Y1
Throughhole
5K ohm +/-1% 1/8W
1x3 2.54 mm pitch female connector
12
J12 J14 J25 J26 J28
J29 J30 J31 J32 J34
J35 J36
Through- hole
Through- hole
Through- hole
1x3 2.54 mm pitch male connector
2x8 2.54 mm pitch male
Connector
2x5 2.54 mm pitch male connector
1
2
1
S1
J15 J38
J17
1x2 2.54 mm pitch male connector
5 J3 J4 JP1 JP3 J20
Through- hole
Through- hole
Through- hole
Through- hole
TQFP64
SONGCHEN CKX-3.5-06 female 8 mm male 3 mm
STA321MPL
1
4
4
J24
1 U1
Manufacturer
Murata
Murata any source
Citizen any source any source any source any source any source
Song Cheng any source any source
STMicroelectronics
Remark
IC VQFN56 STA321MP 1 U8 STMicroelectronics
Do not solder
IC
IC
IC
IC
IC
IC
SOT23-5
TSOP20
MINISO8
SO14
SOT223
SOT23-
6L
LDS3985M18R 1.8 V regulator
ST2378ETTR
TS482IST
1 U2
1 U6
1 U10
74VHC74MTR 1 U4
LD1117S33 1 U7
STG719STR 2 IC1 IC2
STMicroelectronics
STMicroelectronics
STMicroelectronics
STMicroelectronics
STMicroelectronics
STMicroelectronics
MEMS mic
MEMS mic
MEMS mic
MP34DT01
MP34DB01
MP45DT02
2 U12
2 U9
2 U3
STMicroelectronics
STMicroelectronics
STMicroelectronics
Solder for V3
Solder for V2
Solder for V1
28/30 DocID023502 Rev 2
AN4146 Revision history
Date
02-Oct-2012
Revision
1
22-Mar-2013 2
Table 6. Document revision history
Changes
Initial release.
Added audio hub demonstration board (STEVAL-MKI138V1) to application note
Section 1: Demonstration board and accessories
Section 1.3: Microphone adapters
Section 2.2: Microphone audio adapter connections
DocID023502 Rev 2 29/30
AN4146
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