NXP Semiconductors 8CH-DMIC Manuale utente

Eight-channel DMIC Board User Manual

Supports Board Revision B

NXP Semiconductors Document identifier: 8CH-DMIC-UM

User Guide Rev. 2, 15 March 2022

Contents

Chapter 1 Overview............................................................................................... 3

1.1 Acronyms...................................................................................................................................3

1.2 Related documentation..............................................................................................................3

1.3 Kit content..................................................................................................................................4

1.4 Block diagram............................................................................................................................4

1.5 Board pictures........................................................................................................................... 4

1.6 Board features...........................................................................................................................6

1.7 Connectors................................................................................................................................ 7

1.8 Jumpers.....................................................................................................................................8

1.9 LEDs........................................................................................................................................11

Chapter 2 Functional Description.........................................................................12

2.1 Power supply...........................................................................................................................12

2.1.1 Main power supply.................................................................................................................... 12

2.1.2 Secondary power supply...........................................................................................................12

2.2 DMIC interface.........................................................................................................................12

2.2.1 DMIC configurations and signal connections............................................................................ 14

2.2.2 DMIC data switch...................................................................................................................... 21

2.2.3 DMIC clock switch.....................................................................................................................22

Appendix A Revision history................................................................................ 24

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Chapter 1

Overview

The eight-channel DMIC plug-in board (8CH-DMIC) provides a single, a double, a triple, a quad, a hexagonal, a hexagonal

(with center mic), and an octal digital microphone (DMIC) solution. The plug-in board can be used with selected EVKs, such as

MIMXRT685-EVK, MIMXRT685-AUD-EVK, and MIMXRT595-EVK (I2C LED control may not be supported on all boards).

This document provides the detail about the 11 DMICs and their configurations, jumpers, LEDs, switches, and other interfaces

available on the board.

Example programs for use of the 8CH-DMIC board can be found in the MCUXpresso SDK software for the EVK being used (see

https://mcuxpresso.nxp.com or download the SDK directly from within MCUXpresso IDE).

1.1 Acronyms

The following table describes the acronyms and abbreviations used in this document.

Table 1. Acronyms and Abbreviations

Term Definition

ADC Analog to digital converter

CPU Central processing unit

DMIC Digital microphone

GPIO General-purpose input/output

LED Light emitting diode

MCU Microcontroller unit

PCB Printed circuit board

RF Radio frequency

SMA Subminiature version a connector

SPI Serial peripheral interface

UART Universal asynchronous receiver transmitter

1.2 Related documentation

The table below lists and explains the additional documents and resources that you can refer to for more information on 8-CH

DMIC board. Some of the documents listed below may be available only under a non-disclosure agreement (NDA). To request

access to these documents, contact your local field applications engineer (FAE) or sales representative.

Table 2. Related documentation

Document Description Link/How to access

i.MX RT685 Evaluation Board User

Manual

It describes the board layout and

settings, and also different interfaces

and peripherals available on the board.

UM11159

MIMXRT685-AUD-EVK Board User

Manual

This document provides detailed

information about the MIMXRT685

Contact NXP FAE / sales representative

Table continues on the next page...

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Table 2. Related documentation (continued)

Document Description Link/How to access

AUD-EVK board interfaces, power

supplies, clocks, push buttons, jumpers,

and LEDs.

1.3 Kit content

The table below describes the items included in the 8-CH DMIC board kit.

Table 3. Kit contents

Item Quantity

Board hardware assembly 1

1.4 Block diagram

The figure below describes the 8-CH DMIC block diagram.

Main Board

Interface

connector

Clock

Buffers

CLK01,

CLK23,

CLK45,

CLK67

Switch

Matrix

Switch

Matrix

DCDC VDD to

3.3V Regulator

DMIC

Array

LEDC

Array

LED

Driver

DATA01,

DATA23,

DATA45,

DATA67

I2C

VDD

(1.8V to

3.3V)

Configuration Jumpers (14)

3.3V

VDD

CLK01,

CLK23,

CLK45,

CLK67

VDD

CLK01,

CLK23,

CLK45,

CLK67

DATA01,

DATA23,

DATA45,

DATA67

Figure 1. 8-CH DMIC block diagram

1.5 Board pictures

The figure below shows the top side of the board, and highlights the jumpers and LEDs available on the board.

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Eight-channel DMIC Board User Manual, Rev. 2, 15 March 2022

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J6, J7, J8, J9, J10, J11, J12, J13

J2, J3, J4

J5, J14, J15

Figure 2. 8CH-DMIC board top side

The figure below shows the bottom side of the board, and highlights the interface connector.

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Figure 3. 8CH-DMIC board bottom side

1.6 Board features

The table below describes the DMIC board features.

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Table 4. Main features

Board feature Processor feature used Description

Interfacing with Main board 14-pin connector used for DMIC board connection with the

main board

Power Input power ranges from 1.8 V

to 3.3 V

Typically, 1.8 V power is used for DMICs, and other interfaces,

however, 3.3 V power also works.

Note: MCP1256T DC converter to convert 1.8 V input power

supply to 3.3 V power supply for onboard LEDs.

Clock Four clocks: CLK01, CLK23,

CLK45, and CLK67

Clocks are used for 11 DMICs available on board. Clocks can

be combined with jumpers J5, J14, and J15 for use with boards

that do not have all the clocks available. Refer to Table 23

for settings.

DMIC array 11 DMICs; at most, eight DMICs are in use simultaneously.

DMIC data signals:

• DATA01

• DATA23

• DATA45

• DATA67

1.7 Connectors

Table 5. Connector detail

Part identifier Connector type Description

J1 2x7-pin connector For 8-CH DMIC board connection with the main board

The table below describes the pin description of J1 connector.

Table 6. Interface connector pin detail

Pin Signal Direction

1 VDD -

2 VDD -

3 CLK01 I

4 DATA01 O

5 CLK23 I

6 DATA23 O

7 CLK45 I

8 DATA45 O

9 CLK67 I

10 DATA67 O

Table continues on the next page...

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Table 6. Interface connector pin detail (continued)

Pin Signal Direction

11 GND -

12 GND -

13 I2C_SCL I

14 I2C_SDA I/O

1.8 Jumpers

The following table describes the jumpers available on the board.

Table 7. Jumpers

Part

identifier

Jumper type Description Settings

J2 1x2 header Jumper for SPH0641LM4H-1

MIC 1 (U3)

• Open: SELECT pin of SPH0641LM4H-1 MIC 1 (U3) is

edge (default setting)

• Shorted: SELECT pin of SPH0641LM4H-1 MIC 1 (U3) is

grounded and asserts data on CLK_MIC1 falling edge

J3 1x2 header Jumper for SPH0641LM4H-1

MIC 2 (U5)

• Open: SELECT pin of SPH0641LM4H-1 MIC2 (U5)

is powered by 1.8 V and asserts data on CLK_MIC2

rising edge

• Shorted: SELECT pin of SPH0641LM4H-1 MIC2 (U5) is

grounded and asserts data on CLK_MIC2 falling edge

(default setting)

J4 1x2 header Jumper for SPH0641LM4H-1

MIC 6 (U10)

• Open: SELECT pin of SPH0641LM4H-1 MIC6 (U10)

is powered by 1.8 V and asserts data on CLK_MIC6

rising edge

• Shorted: SELECT pin of SPH0641LM4H-1 MIC6 (U10)

is grounded and asserts data on CLK_MIC6 falling edge

(default setting)

J5 1x3 header Jumper for selection of

CLK01 or CLK23 clock signal

• 1-2 shorted: CLK01 is connected and supplies the

clock (option1)

• 2-3 shorted: CLK23 is connected and supplies the clock

(default setting)

Combination of jumpers J5, J14, and

J15 provide several clock selection

options. For detail, see Table 23.

NOTE

J6 1x2 header Used to: • Open: Data control and clock control signals for MIC

3 and MIC 9 are high, and MIC 3 and MIC 9 are not

enabled (default setting)

Table continues on the next page...

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Table 7. Jumpers (continued)

Part

identifier

Jumper type Description Settings

• control the data from

ADG711 (U12) switch

and clock from ADG711

(U16) switch for MIC 3

• control the data from

ADG711 (U18) switch

and clock from ADG711

(U21) switch for MIC 9

• Shorted: Data control and clock control signals for MIC 3

and MIC 9 are low, and MIC 3 and MIC 9 are enabled

J7 1x2 header Used to control the data from

ADG711 (U12) switch and

clock from ADG711 (U13)

switch for MIC 2

• Open: Data control and clock control signals for MIC 2

are high, and MIC 2 is not enabled (default setting)

• Shorted: Data control and clock control signals for MIC 2

are low, and MIC 2 is enabled

J8 1x2 header Used to control the data from

ADG711 (U12) switch and

clock from ADG711 (U13)

switch for MIC 1

• Open: Data control and clock control signal for MIC 1 are

high, and MIC 1 is not enabled

• Shorted: Data control and clock control signal for MIC 1

are low, and MIC 1 is enabled (default setting)

J9 1x2 header Used to control the data from

ADG711 (U12) switch and

clock from ADG711 (U13)

switch for MIC 0

• Open: Data control and clock control signals for MIC 0

are high, and MIC 0 is not enabled

• Shorted: Data control and clock control signals for MIC 0

are low, and MIC 0 is enabled (default setting)

J10 1x2 header Used to control the data from

ADG711 (U15) switch and

clock from ADG711 (U19)

switch for MIC 6

• Open: Data control and clock control signals for MIC 6

are high, and MIC 6 is not enabled (default setting)

• Shorted: Data control and clock control signals for MIC 6

are low, and MIC 6 is enabled

J11 1x2 header Used to control the data from

ADG711 (U15) switch and

clock from ADG711 (U16)

switch for MIC 4

• Open: Data control and clock control signals for MIC 4

are high, and MIC 4 is not enabled (default setting)

• Shorted: Data control and clock control signals for MIC 4

are low, and MIC 4 is enabled

J12 1x2 header Used to:

• control the data from

ADG711 (U15) switch

and clock from ADG711

(U16) switch for MIC 3

• control the data from

ADG711 (U15) switch

and clock from ADG711

(U13) switch for MIC 2

• Open: Data control and clock control signals for MIC 2,

MIC 3, MIC 4, MIC 5, MIC 6, and MIC 10 are high, and

MIC 2, MIC 3, MIC 4, MIC 5, MIC 6, and MIC 10 are

not enabled

• Shorted: Data control and clock control signals for MIC

2, MIC 3, MIC 4, MIC 5, MIC 6, and MIC 10 are high,

and MIC 2, MIC 3, MIC 4, MIC 5, MIC 6, and MIC 10 are

enabled (default setting)

Table continues on the next page...

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Table 7. Jumpers (continued)

Part

identifier

Jumper type Description Settings

• control the data from

ADG711 (U20) switch

and clock from ADG711

(U19) switch for MIC 6

• control the data from

ADG711 (U20) switch

and clock from ADG711

(U21) switch for MIC 10

• control the data from

ADG711 (U20) switch

and clock from ADG711

(U19) switch for MIC 5

• control the data from

ADG711 (U20) switch

and clock from ADG711

(U16) switch for MIC 4

J13 1x2 header Used to:

• control the data from

ADG711 (U18) switch

and clock from ADG711

(U19) switch for MIC 7

• control the data from

ADG711 (U18) switch

and clock from ADG711

(U21) switch for MIC 8

• control the data from

ADG711 (U18) switch

and clock from ADG711

(U21) switch for MIC 10

•Open: Data control and clock control signals for MIC 7,

MIC 8, and MIC 10 are high, and MIC 7, MIC 8, and MIC

10 are not enabled (default setting)

• Shorted: Data control and clock control signals for MIC 7,

MIC 8, and MIC 10 are high, and MIC 7, MIC 8, and MIC

10 are enabled

J14 1x3 header Jumper for selection of

CLK01 or CLK45 clock signal

• 1-2 shorted: CLK01 is connected and supplies the

clock (option1)

• 2-3 shorted: CLK45 is connected and supplies the clock

(default setting)

Combination of jumpers J5, J14, and

J15 provide several clock selection

options. For detail, see Table 23.

NOTE

J15 1x3 header Jumper for selection of

CLK45 or CLK67 clock signal

• 1-2 shorted: CLK45 is connected and supplies the clock

(default setting)

• 2-3 shorted: CLK67 is connected and supplies the

clock (Option1)

Table continues on the next page...

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