MAX20328 [MAXIM]

Automatic MIC/GND Orientation Detection;


型号：	MAX20328
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Automatic MIC/GND Orientation Detection
文件：	总8页 (文件大小：829K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Click here for production status of speciﬁc part numbers.

Evaluates: MAX20328/

MAX20328A Evaluation Kit

MAX20328A/MAX20328B

General Description

Quick Start

The MAX20328A evaluation kit (EV kit) is a fully assem-

bled and tested circuit for evaluating the MAX20328/

MAX20328A/MAX20328B MUX switch for USB-C audio

adapter applications. The device features automatic MIC-

GND orientation and headphone impedance detection,

Beyond-the-Rails™ signal capability, and surge protec-

tion on pins attached to the USB-C connector. This EV

kit enables fast and easy evaluation of the MAX20328/

MAX20328A/MAX20328B switches in USB-C audio appli-

cations.

Required Equipment

The following equipment is required to verify the basic

functionality of this EV kit:

● 5V capable power supply

● Host device with I C communication support

● DMM or continuity tester

Optional Equipment

The following equipment can be used for more

complete testing of this EV kit:

The EV kit is populated with MAX20328A. The MAX20328,

MAX20328A, and MAX20328B are pin-to-pin and register

compatible. Users can install their own MAX20328 for

evaluation.

● USB Flash drive or other device with a USB-A male

connector

● USB A-to-B cable

● USB C cable

Features

● Automatic MIC/GND Orientation Detection

● TRRS 3.5mm audio cable

• MIC Line Bias Check Safeguards Against Shorting

MIC to GND

● TRRS 3.5mm audio device with 3.5mm to USB-C

passive adapter

● 3.5mm Audio Jack for Testing with Audio Signals

Procedure

● Onboard USB Receptacles for Passing and

The EV kit is fully assembled and tested. Follow the steps

below to verify board operation:

Measuring Data Signals

● Proven PCB Layout

1) Verify the positions of the conﬁguration resistor pairs

● Fully Assembled and Tested

R1 and R2, R4 and R5, and R6 and R8.

a) For evaluating MAX20328, R1, R4, and R6

should be installed.

b) For evaluating MAX20328A/MAX20328B, R2,

R5, and R8 should be installed.

Ordering Information appears at end of data sheet.

2) Verify shunts are installed on jumpers JU1 and on

JU3 in the 1-2 position. JU3 selects the source of the

supply.

3) Connect the positive lead of a 2.7 to 5V power supply

to TP12 and the negative lead to TP14, then safely

turn on the supply.

4) Connect SCL of the I C device to TP16 and SDA to

TP17; or use the 40-pin connector.

5) Read register 0x00 using the I C read address 0x2B.

If the data read matches the DEVICE_ID value of the

installed device (Table

of the MAX20328/

MAX20328A/MAX20328B data sheet), the EV kit is

Beyond-the-Rails is a trademark of Maxim Integrated Products, Inc.

conﬁgured correctly.

319-100192; Rev 1; 1/20

Evaluates: MAX20328/

MAX20328A Evaluation Kit

MAX20328A/MAX20328B

To test automatic audio headset detection and switch

configuration, use the following procedure:

Hardware Connectors

The MAX20328A EV kit contains several USB connectors

and a 3.5mm audio jack to conveniently check the

functionality of different signal paths.

1) After establishing communication with the EV kit

device, verify that automatic headset detection is

enabled. Enable it if needed.

USB Connectors

2) Supply an audio signal to the 3.5mm jack J7 on the

EV kit.

A USB-C female connector connects to the top- (DP_T,

DM_T) and bottom-side (DP_B, DM_B) D+/D- data

lines, SBU lines, and the CC2 pin to the MAX20328/

MAX20328A/MAX20328B as they would in a typical appli-

cation. Alternatively, two USB-B female connectors are

also available to provide these signals independently. J2

connects to DP_B and DM_B, and J4 connects to DP_T

and DM_T.

3) Insert a TRRS headset with USB-C passive adapter

(this will not work for active adapters) and verify the

audio signal is routed to the headset.

Detailed Description of Hardware

The MAX20328A EV kit is a fully assembled and tested

PCB for evaluating the MAX20328, MAX20328A, and

MAX20328B USB-C audio MUX switches. Although the

MAX20328, MAX20328A, and MAX20328B have slightly

different features, the same hardware can be used to

evaluate both devices. By installing combinations of

0Ω resistors, the signals will be routed correctly for the

selected device.

Two USB-A female connectors allow for testing data

transfer to a USB flashdrive or similar device with a

USB-A male connector. J1 connects to the bottom side

data pins and J6 connects to the top side data pins.

3.5mm Audio Jack

The EV kit also includes a 3.5mm jack for evaluating the

audio signal routing action. The TRRS jack J7 simplifies

injecting an audio signal into the EV kit. When a 3.5mm

audio headset is detected on the USB-C input by means

of a passive adapter, the signal coming into J7 will be

routed to the USB-C connector and the headset.

Table 1. Jumper Configurations

JUMPER

SHUNT POSITION

Installed*

Not Installed

Installed

DESCRIPTION

Connects V

of the device to the EV kit supply.

JU1

of the device disconnected from EV kit supply.

Attaches a 3.92kΩ pullup resistor to V

on INT of the MAX20328A/MAX20328B.

JU2

JU3

JU4

JU5

JU6

JU7

JU8

JU9

Not Installed*

1-2*

No pullup on MAX20328A/MAX20328B INT pin.

Connects EV kit supply to TP12 for an external supply voltage.

Connects EV kit supply to the 3.3V line of the 40-pin connector.

Connects a 3.92kΩ pullup resistor from SCL to the 3.3V line of the 40-pin connector.

No pullup on SCL to 3.3V line.

2-3

Installed

Not Installed*

Installed

Connects a 3.92kΩ pullup resistor from SDA to the 3.3V line of the 40-pin connector.

No pullup on SDA to 3.3V line.

Not Installed*

1-2*

Ties U1 CC pin to V

through a 10kΩ pullup resistor. Leave open or shunt 1-2 to use J3 CC.

2-3

Ties U1 CC pin to ground. Leave open or shunt 1-2 to use J3 CC.

J3 CC is connected to U1 CC and pulled to voltage selected by JU6.

U1 CC is ﬂoating or tied to voltage selected by JU6.

Installed*

Not Installed

Installed*

Not Installed

Installed

Connects GSNS_L (MAX20328) or GSNS (MAX20328A/MAX20328B) to AGND.

GSNS_L (MAX20328) or GSNS (MAX20328A/MAX20328B) not connected to AGND.

Connects GSNS_R (MAX20328) to AGND.

Not Installed*

Connects GSNS_R (MAX20328) to AGND.

*Default position

Maxim Integrated

│ 2

www.maximintegrated.com

Evaluates: MAX20328/

MAX20328A Evaluation Kit

MAX20328A/MAX20328B

Table 2. Test Point Assignments

TEST POINT

TP1

SIGNAL

MIC

TEST POINT

TP11

SIGNAL

INT (MAX20328A/MAX20328B only)

External supply connection

TP2

AGND

TP12

TP3

TP13

of EV kit board

Ground

SCL

TP4

TP14

GSNS_L (MAX20328) or

GSNS (MAX20328A/MAX20328B)

TP15

TP5

TP16

TP6

TP7

TP8

TP9

TP10

GSNS_R (MAX20328 only)

TP17

SDA

TX (MAX20328A/MAX20328B only)

CC2 pin of connector J3. Connects to CC

of MAX20328/MAX20328A/MAX20328B if

a shunt is present on JU7.

of U1

TP18

Ground

RX (MAX20328A/MAX20328B only)

Ordering Information

PART

TYPE

MAX20328AEVKIT#

EV Kit

#Denotes RoHS compliant.

Maxim Integrated

│ 3

www.maximintegrated.com

Evaluates: MAX20328/

MAX20328A Evaluation Kit

MAX20328A/MAX20328B

MAX20328A EV Kit Bill of Materials

Maxim Integrated

│ 4

www.maximintegrated.com

Evaluates: MAX20328/

MAX20328A Evaluation Kit

MAX20328A/MAX20328B

MAX20328A EV Kit Schematic

B 3

Maxim Integrated

│ 5

www.maximintegrated.com

Evaluates: MAX20328/

MAX20328A Evaluation Kit

MAX20328A/MAX20328B

MAX20328A EV Kit PCB Layout Diagrams

MAX20328A EV Kit—Top Silkscreen

MAX20328A EV Kit—Top

MAX20328A EV Kit—Layer 2

Maxim Integrated

│ 6

www.maximintegrated.com

Evaluates: MAX20328/

MAX20328A Evaluation Kit

MAX20328A/MAX20328B

MAX20328A EV Kit PCB Layout Diagrams (continued)

MAX20328A EV Kit—Layer 3

MAX20328A EV Kit—Bottom

MAX20328A EV Kit—Bottom Silkscreen

Maxim Integrated

│ 7

www.maximintegrated.com

Evaluates: MAX20328/

MAX20328A Evaluation Kit

MAX20328A/MAX20328B

Revision History

REVISION REVISION

PAGES

CHANGED

DESCRIPTION

NUMBER

DATE

5/18

Initial release

Updated all pages to evaluate MAX20328B

—

1/20

1–8

For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.

Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses

are implied. Maxim Integrated reserves the right to change the circuitry and speciﬁcations without notice at any time.

Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.

2020 Maxim Integrated Products, Inc.

│ 8

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