MAX20328AEVKIT [MAXIM]
Automatic MIC/GND Orientation Detection;型号: | MAX20328AEVKIT |
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 |
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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
2
● 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
V
supply.
CC
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.
2
4) Connect SCL of the I C device to TP16 and SDA to
TP17; or use the 40-pin connector.
2
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
5
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.
CC
JU1
V
of the device disconnected from EV kit supply.
CC
Attaches a 3.92kΩ pullup resistor to V
on INT of the MAX20328A/MAX20328B.
CC
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.
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
LA
TP12
TP3
TP13
V
of EV kit board
Ground
Ground
SCL
CC
TP4
RA
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.
V
of U1
CC
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
6
5
5
6
6
5
8
7
5
6
1
3
B 3
1
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
0
1
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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