Analog Devices MAX25460 Manuale utente

Evaluates: MAX25460 MAX25460 Evaluation Kit

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General Description

This evaluation kit (EV kit) demonstrates the MAX25460

automotive USB Type-A controller with 1GHz BW USB

2.0 D+/D- protection switches. The MAX25460 features

a high-current, high-e󰀩ciency, host-charger with port-

detection circuitry adhering to the USB 2.0 and the USB-

IF BC1.2 battery charging specications. The step-down

DC-DC converter operates from up to 28V continuous

and protects against load dump transients up to 40V.

The converter switches at 2.2MHz and can deliver 1.5A

continuously and 2.4A for up to 1.1ms. The MAX25460

integrates high-side current sensing and circuitry to auto-

matically adjust the USB voltage to compensate for volt-

age drops in long automotive cables..

The EV kit is populated with a MAX25460ATGA/V+ prod-

uct variant for 2.2MHz operation. The high-speed data

switches of the MAX25460 generally do not require far-

end eye tuning, so the EV kit is populated with 0Ω resis-

tors in place of the LC turning circuits.

The EV kit allows evaluation of the following MAX25460

capabilities:

●Adjustable buck converter precision current limit for

better system performance.

●Adjustable current limit debounce timer for overcur-

rent testing and system flexibility.

●Adjustable gain settings for cable compensation for

low-cost captive cables up to 474mΩ.

●Electromagnetic interference (EMI) mitigation using

spread spectrum switching.

●Detailed interrupt and fault status providing multilayer

protection and recovery to improve system decisions

during faults.

Features

●Configurable Charge Detection Modes

• USB-IF BC1.2 SDP, CDP

●Automatic USB Voltage Adjustment by Integrated

DC-DC Converter

●Proven PCB Layout

●Fully Assembled and Tested

319-100999; Rev 0; 5/23

Ordering Information appears at end of data sheet.

MAX25460 Evaluation Kit Board

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MAX25460 Evaluation Kit Evaluates: MAX25460

Quick Start

Required Equipment

●MAX25460 EV kit

●Windows®-based PC

●Two-meter USB-A extension cable

●USB-A to Micro-B cable

● 3.5Ω 10W resistor or electronic load

●USB Type-A plug

●14V/2A DC power supply or car battery (VBAT)

●Digital voltmeter

●USB Type-A flash drive

The following procedure demonstrates the MAX25460’s

high-speed data switches and voltage adjustment capa-

bility.

Procedure

Initial Setup

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

to set up the board for evaluation.

1) Install the MAX25460 GUI. See the MAX25460 GUI

section for additional information.

2) Verify that SW1 switch is set to HVEN=L,

ENBUCK=L, SYNC=L, and DATA_MODE=L.

3) Connect the EV kit to the PC with USB Micro-B and

USB-A extension cables (see Figure 1).

4) Verify that the EV kit is recognized in the Windows

Device Manager as USB input device.

5) Set the VBAT power supply to 14V output, 2A current

limit. Turn the output o󰀨. Connect negative lead to

the “GND_1” test loop on the EV kit. Connect posi-

tive lead to “VBAT_FLT” test loop on the EV kit.

6) Plug a USB ash drive into the EV kit USB connector

(J3).

7) Turn on the VBAT power supply output.

8) Start the MAX25460 GUI. Look at the message

bar on the left of the GUI to verify that the EV kit is

detected (see Figure 2).

High-Speed Data Switches

9) In the GUI, click ENBUCK PIN and Conguration

Complete checkboxes.

10) Check that the USB ash drive is recognized on the

host computer by opening the directory. This veries

the high-speed data switches are operating properly.

See Figure 3.

11) Unplug the ash drive from the EV kit.

Figure 1. EV Kit Setup

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MAX25460 Evaluation Kit Evaluates: MAX25460

Figure 2. MAX25460 GUI Startup

Figure 3. USB Flash Drive Recognized

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MAX25460 Evaluation Kit Evaluates: MAX25460

USB BC1.2 CDP Charging

12) In the GUI, set Cable Comp Gain to 108mΩ and set

Charge Detection to Auto_CDP.

13) Connect a USB cable and a BC1.2 CDP-compatible

smartphone.

14) Check that the smartphone is recognized on the host

computer and that it is charging.

15) VBUS current can be checked by measuring the volt-

age drop across the current-sense resistor R1.

16) Unplug the smartphone and 2m USB-A extension

cable from the EV kit.

Cable Compensation

17) Connect the 2m USB-A extension cable to the EV kit

downstream USB connector (J3).

18) Connect the Type-A plug to the other end of the

extension cable (see Figure 4).

19) Measure the VBUS voltage at the end of cable, it

should be around 5.15V.

• Note: This is the voltage at the portable device.

20) Connect the E-load or resistor bank to the USB

plug’s Ground and VBUS pins.

21) Adjust the Cable Comp Gain in the GUI until the volt-

age at the far-end reaches 5.15V.

22) The voltage at the far-end of the 2m cable is regulated

to approximately 5.15V regardless of the load current.

Figure 4. EV Kit Setup for Cable Compensation

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MAX25460 Evaluation Kit Evaluates: MAX25460

Detailed Description

The MAX25460 EV kit comes fully assembled, tested,

and installed with MAX25460ATGA/V+. The stand-alone

variant can also be used on this EV kit by changing the

IC and configuration resistors. See Table 1 for an example

of stand-alone configuration. Refer to the MAX25460 data

sheet for further details on configuration resistors.

When R6 and R7 are changed per Table 1, 3.3V is

sourced from the on-board LDO and the USB Micro-B

connection to the Pico board should not be used.

EV Kit Interface

Header J1 includes input and output test points for con-

trolling the IC and evaluating its functionality. Table 2 lists

the individual pins and their functions.

Switch SW1 allows the user to set the voltage on the

HVEN, ENBUCK, SYNC, and DATA_MODE pins (see

Table 3). Setting a switch to the ON position ties the con-

nected pin high. Setting a switch to the OFF position ties

the pin to ground through a pull-down resistor. To exter-

nally control these pins through the header J1 or the PC

GUI, set all switches to the OFF position.

Table 1. Stand-Alone Configuration Example

Table 2. External Header

PIN NAME RESISTOR VALUE DESCRIPTION

CONFIG1 R2 0Ω Spread Spectrum: On; Sync as Input; Fsw = 2.2MHz

CONFIG2 R4 14.7kΩ GAIN[3:0] = 1100

CONFIG3 R3 2.26kΩ GAIN[4] = 1; ILIM = 1.62A (min)

Note: Gain programmed with this conguration is 28.

SDA/SCL R15/R16 DNP Remove SDA/SCL pull-ups.

3V3 R6 DNP Jumper option, 3.3V from Pico interface board

3V3 R7 0Ω Jumper option, 3.3V from MAX15006 LDO

J1 PIN NAME DESCRIPTION

1 IN 3.3V supply for IN (input/output)

2 SYNC Buck regulator synchronization pin (input/output)

3 DATA_MODE Charge detection conguration pin (input)

4 HVEN IC enable (active high, input)

5 ENBUCK DC-DC enable (active high, input)

6FAULT Fault indicator (active low, open-drain, output)

7INT (ATTACH) I2C interrupt output (active low, open-drain)

Standalone: USB attach output (active low, open-drain)

8 BIAS 4.7V LDO output

9SCL

(CONFIG3)

I2C: clock (input)

Standalone: CONFIG3 (input)

10 SDA

(CONFIG2)

I2C: data (input/output)

Standalone: CONFIG2 (input)

11 GND EV kit ground

12 GND EV kit ground

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MAX25460 Evaluation Kit Evaluates: MAX25460

Basic Functionality

Connect a 9V to 16V power source (battery supply)

between VBAT_FLT and GND test loops and USB Micro-B

to a host PC. Connecting the Micro-B to a PC pulls the

HVEN pin to 3.3V and enables the device. The ENBUCK

pin is driven by the GUI and SW1 and must be high for

the DC-DC converter to turn on. The charge mode can be

congured through I2C or using the DATA_MODE switch

or pin. If the DATA_MODE pin is high, it overrides the cur-

rent I2C register setting.

Fault Diagnostics

The FAULT pin is software compatible with ADI Type-A

Automotive USB solutions. More advanced diagnostics

can be performed using the I2C bus and the INT pin. The

IRQ bits have an associated IRQ_MASK bit. When the

IRQ_MASK bit is set to 1, the INT pin asserts and de-

asserts following the IRQ bit. All IRQ bits clear on read.

IRQ bit de-assertion is controlled by the IRQ_AUTOCLR

bit. When IRQ_AUTOCLR = 0 (default), the error bit stays

asserted until the register is read even if the fault condi-

tion is no longer present. When IRQ_AUTOCLR = 1, the

IRQ bit de-asserts without a read as soon as the fault

criteria are no longer met. The EV kit GUI uses a polling

mechanism to read all MAX25460 registers. A read is ini-

tiated when the Read All Registers button is clicked, or

periodically if auto read is enabled. Due to the auto read

polling mechanism, when IRQ_AUTOCLR = 1 it is pos-

sible that the GUI can miss IRQ bit assertions because

the signal de-asserts too quickly after a fault.

PCB Layout Guidelines

A good PCB layout is critical to proper system perfor-

mance. The loop area of the DC/DC conversion circuitry

must be minimized as much as possible. Place the input

capacitor, power inductor, and output capacitor very close

to the IC. Shorter traces should be prioritized over wider

traces.

Table 3. External Switch

SW1 PIN POSITION DESCRIPTION

HVEN 0 Device disabled

1 Device enabled

ENBUCK 0 Buck output disabled

1 Buck output enabled

SYNC

SYNC congured as an input:

DC-DC operates in FPWM.

Refer to the MAX25460 data sheet for more information.

SYNC congured as an output:

DC-DC operates in FPWM.

SYNC pin generates clock output for synchronization of other devices.

If enabled, spread spectrum is also present on SYNC output to reduce EMI of the device

synchronized to MAX25460. SYNC output is 180° out of phase with internal clock to further

help reduce EMI.

0 with clock

applied to

SYNC through

SYNC congured as an input:

DC-DC operates in FPWM.

The MAX25460 can be synchronized to an external clock - for example, another MAX25460.

Spread spectrum is not applied to external clock from SYNC pin.

1SYNC congured as an input:

DC-DC operates in skip mode with light/no-load, FPWM otherwise.

DATA_MODE 0 High-speed pass-through mode (SDP)

1 Auto-CDP mode

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MAX25460 Evaluation Kit Evaluates: MAX25460

A low-impedance ground connection between the input

and output capacitors is required for reliable operation.

Make this connection through the ground pour on the

exposed pad. Place multiple vias in the pad to connect

to all other ground layers to reduce thermal resistance.

Inadequate thermal performance may cause the IC to

cycle in and out of thermal shutdown. Use a single com-

mon ground with GND vias directly adjacent to all com-

ponents that connect down to an adjacent ground plane.

This arrangement enables high frequency return currents

to ow directly under their respective source traces.

The USB traces must be routed as a 90Ω di󰀨erential pair

with an appropriate keep-out area. Avoid routing USB

traces near high frequency switching nodes or other

sources of noise such as clocks. The length of the rout-

ing should be minimized and avoid 90° turns, excessive

vias, and RF stubs. The MAX25460 has high-bandwidth

data switches. See the IC data sheet for details on tuning

recommendations.

See the Layout Considerations section in the MAX25460

data sheet for additional information.

MAX25460 GUI

The latest GUI can be downloaded from the MAX25460

EV kit webpage: https://www.analog.com/en/design-

center/evaluation-hardware-and-software/evaluation-

boards-kits/max25460evkit.html

The GUI is divided into sections to allow the user easy

access to all settings and direct register read/write.

1) Direct read/write access to all registers

2) Basic setup parameters for the buck converter, cable

compensation, and USB data switch mode

3) Interrupt mask and interrupt ag indicators

4) Control for MAX25460 hardware I/O pins

All GUI setting changes immediately a󰀨ect the MAX25460.

Auto-polling of MAX25460 registers by the GUI can also

be enabled in the GUI Conguration section.

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MAX25460 Evaluation Kit Evaluates: MAX25460

Pico Board Firmware Update

The Pico Board comes preprogrammed, however it may

be necessary to update the rmware as new versions are

published on the EV kit webpage.

1) Perform the Initial Setup steps to start the GUI.

2) Check the Pico Board rmware version.

The Pico Board firmware version follows a Year/Month/

Day format from when it is released.

3) If the rmware image from the EV kit webpage has a

later date, follow the Programming Procedure to up-

date the Pico Board’s rmware to the latest version.

This update requires the MAX25460 EV kit, a USB

Micro-B cable, and a PC with USB Write access.

Programming Procedure

1) Download the latest Pico Board rmware on the EV

kit webpage (.bin le).

2) Connect the USB Micro-B cable to the Pico Board.

3) While holding the button down on the Pico Board,

plug the USB Micro-B cable into the PC.

The button is small, it may be helpful to use a pencil

eraser, stylus, or any other non-metallic tool to press

the button.

4) Continue holding the button down for at least 3 sec-

onds after making the connection.

5) A new drive called MAINTENANCE appears on the

PC if Step 4 is successful.

• If the MAINTENANCE drive does not appear,

disconnect the USB cable and repeat steps 3 to 5.

6) Drag and drop the .bin le onto the MAINTENANCE

drive. The Pico Board LED blinks during programming.

7) Wait for the blinking to stop, which takes about 5

seconds.

8) When all is nished, launch the GUI and make sure

that the Pico Board is detected with the expected

rmware version.

#Denotes RoHS compliance.

PART TYPE

MAX25460EVKIT# EV Kit

Ordering Information

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MAX25460 Evaluation Kit Evaluates: MAX25460

MAX25460 EV Kit Bill of Materials

QTY REFERENCE DESCRIPTION PART NUMBER MANUFACTURER

1C1 CERAMIC CAPACITOR (0402) 2200PF 10% 50V X7R GRM155R71H222KA01 MURATA

1C2 ALUMINUM-ELECTROLYTIC CAPACITOR 22UF 20% 50V EEE-FT1H220AR PANASONIC

6C3, C4, C12, C16, C18, C20 CERAMIC CAPACITOR (0402) 0.1UF 10% 50V X7R GRM155R71H104KE14 MURATA

1C5 CERAMIC CAPACITOR (1210) 4.7UF 10% 50V X7R GRM32ER71H475KA88 MURATA

1C7 CERAMIC CAPACITOR (1210) 22UF 10% 25V X7R GRM32ER71E226KE15 MURATA

2C8, C17 CERAMIC CAPACITOR (0603) 2.2UF 10% 16V X7R GRM188Z71C225KE43 MURATA

1C15 CERAMIC CAPACITOR (0603) 1UF 10% 16V X7R C0603C105K4RAC KEMET

2D1, D3 SCHOTTKY BARRIER DIODE (SMB) 60V 3A B360B-13-F DIODES INCORPORATED

1D2 SCHOTTKY BARRIER DIODE (SOD-323) 30V 0.5A B0530WS-7-F DIODES INCORPORATED

1DS1 GREEN WATER CLEAR LED APT1608LZGCK KINGBRIGHT

2FB1, FB2 FERRITE-BEAD (0805) 60R 25% 3.5A BLM21PG600SN1 MURATA

5GND_1, GND_2, USB_5V, VBAT, VBAT_FLT TEST POINT 5020 KEYSTONE

1HOST_VBUS TEST POINT 5003 KEYSTONE

1 J1 HEADER 12-PINS TSW-112-07-G-S SAMTEC

1 J2 USB TYPE-A PLUG 1734028-1 TE CONNECTIVITY

1 J3 USB TYPE-A RECEPTACLE AU-Y1006-R ASSMANN

1L5 INDUCTOR 1.5UH 20% 2.7A DFE252012F-1R5M MURATA

1MOD1 MAX32625PICO MODULE MAX32625PICO MAXIM

1R1 RESISTOR (0805) 0.033R 1% +/-50PPM/C 0.5W KRL1220E-M-R033-F SUSUMU CO LTD.

6L1, L2, L4, L6, R2, R6 RESISTOR (0402) 0R 0.2W CRCW04020000Z0EDHP VISHAY DALE

4R8-R11 RESISTOR (0402) 2K 5% 0.063W CRCW04022K00JN VISHAY DALE

4R12, R17, R18, R21 RESISTOR (0402) 1K 5% 0.063W CRCW04021K00JK VISHAY DALE

2R13, R14 RESISTOR (0402) 100K 5% 0.063W CRCW0402100KJN VISHAY DALE

2R15, R16 RESISTOR (0402) 2.2K 5% 0.063W CRCW04022K20JN VISHAY DALE

1R20 RESISTOR (0402) 51K 5% 0.063W CRCW040251K0JN VISHAY

1SW1 QUAD SPST HALF-PITCH DIP SWITCH TDA04H0SB1 C&K COMPONENTS

1U1 MAX25460ATGA/V+ MAX25460ATGA/V+ ANALOG DEVICES

1U2 ULTRA-LOW QUIESCENT-CURRENT LINEAR REGULATOR MAX15006AATT+ ANALOG DEVICES

1PCB MAX25460 REVC MAX25460 REVC ANALOG DEVICES

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MAX25460 Evaluation Kit Evaluates: MAX25460

MAX25460 EV Kit Schematic

ADDR=0X30

SS=ON

SYNC=IN

LOW = SDP (DEFAULT)

HIGH = AUTO-CDP

DIFFERENTIAL

CONFIG1 = 0R

FROM AGND FOR BEST PERFORMANCE

DEFAULT CONFIG

DATA_MODE

LAYOUT NOTE: SEPARATE PGND HIGH FREQUENCY RETURN CURRENTS

DNI

1734028-1

2PF2PF

B0530WS-7-F 0

DNI

1UF

16V

2.2K

0.033

16V

2.2UF

MAX25460ATGA/V+

1.5UH

MAX32625PICO

TSW-112-07-G-S

APT1608LZGCK

51K

0.1UF

50V

B360B-13-F

50V

0.1UF

2.2K

6PF 6PF

50V

22UF

50V

0.1UF

50V

AU-Y1006-R

2K 2K

50V

0.1UF

TSW-103-23-G-S

DNI

25V

68UF

DNI

2.2UF

B360B-13-F

MAX15006AATT+

DNI

14.7K

DNI

3.74K

DNI

2.2UF

16V

50V

2200PF

BLM21PG600SN1

4.7UF

50V

0.1UF

DNI

25V

100K

DNI

0.1UF

50V

BLM21PG600SN1

DNI

100K

22UF

1.5UH

R21

C14C13

HOST_VBUS

FB2

R20

DS1

R19

R11R10R9

R18

R17

R12

MOD1

C18

C17

VBAT R2

C16

GND_2

USB_5V

GND_1

VBAT_FLT

C11

C10

FB1

C6C7

R13

SW1

R14C15

C2 C5 C20

C12

R15R16

D-

SDA_CONFIG2

SCL_CONFIG3

GND

FAULTB

BIAS

SCL_CONFIG3

SDA_CONFIG2

INTB_ATTACHB

BIAS

BST

ENBUCK

HVEN

SYNC

DATA_MODE

SDA_CONFIG2

HVDM

VBAT_FLT

INTB_ATTACHB

HVDP

HVEN

ENBUCK

PICO_RX

HVEN

BIAS

PICO_TX

FAULTB

INTB_ATTACHB

ENBUCK

SYNC

DATA_MODE

SUPSW

DATA_MODE

SYNC

SENSP

HVD+

HVD-

USB_5V

D+

VBAT_D

SDA_CONFIG2 SCL_CONFIG3

CONFIG1

SCL_CONFIG3

SUPSW

SENSN

ENBUCK

BIAS

DATA_MODE

K A

9 12

2 1

5 4

2 1

SHIELD

DATA MODE

IC(G_DMOS)

SENSN

SENSP

SUPSW

HVEN

PGND

CONFIG1

BST

ENBUCK

SDA(CONFIG2)

SCL(CONFIG3)

SYNC

FAULT

HVDP

HVDM

AGND

INT(ATTACH)

AGND

BIAS

GND +1.8V

+3.3V+5V

PIN0_7

PIN0_6

PIN0_5

PIN0_4

PIN0_3

PIN0_2

PIN0_1

PIN0_0

PIN4_4

PIN4_5

PIN4_7

PIN4_6

PIN1_7

PIN1_6

AIN2

AIN0

OUT

EP GND

Indice

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