Analog Devices EVAL-MAX49918 Manual de usuario

Evaluation Board User Guide

EVAL-MAX49918 Evaluation Kit

Evaluates: MAX49918

319-101014; Rev 0; 7/23

DOCUMENT FEEDBACK

TECHNICAL SUPPORT

One Analog Way, Wilmington, MA 0 1887- 2356, U.S.A.

Tel: 781.329.4700

General Description

The MAX49918 evaluation kit (EV kit) is a fully tested and

assembled circuit that demonstrates the capabilities of

the MAX49918, a high-precision, wide measurement

range, programmable gain, bidirectional current-sense

amplifier that monitors two distinct current levels.

The gain of MAX49918 is programmed by I2C

communication.

The MAX49918 EV kit operates over the automotive

temperature range of -40°C to +125°C.

The EV kit reserves a PCB footprint so that a

MAX32625PICO board can be soldered on it. With the

MAX32625PICO board, users can control the gain

conveniently with the GUI software.

Features

•Programmable Gain Options through I2C from 10V/V

to 200V/V (8 steps)

•         

VDD/2

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REF2 = GND for Gain = 20V/V

•±0.01% (typ) Gain Error

•-5V to +70V Input Voltage Range

•-6V to +80V Protective Immunity

•70kHz, -3dB Bandwidth for Gain = 20V/V

•145dB DC CMRR

•Rail-to-Rail Output

•3mm x 3mm TDFN-10 Package

•-40°C to +125°C Temperature Range

MAX49918 EV Kit Files

FILE

DESCRIPTION

max49918_tdfn10_evkit_a_

MARKETING_SCH.pdf

EV Kit Schematic

MAX49918_TDFN10_EVKIT_A

_MARKETING_PCB.PDF

EV Kit PCB Layout

marketing_bom_max49918_tdf

n10_evkit_a.csv

EV Kit Bill of Materials

max49918_tdfn10_evkit_a.brd

EV Kit PCB Layout file

Ordering Information appears at end of data sheet.

Windows is a registered trademark and registered service mark

of Microsoft Corporation.

Quick Start

Required Equipment

•MAX49918 EV kit

•0 to 70V DC power supply for VCM input

•+3.3V, 100mA DC power supply

•Electronic load capable of sinking 3A

•One 6½ digital multimeter (DMM like 34401A)

•One 8½ digital multimeter (DMM like Agilent 3458)

Optional Equipment

•MAX32625PICO Board

•Windows®10 PC

•MAX49918EV kit GUI software

Procedure

The MAX49918 EV kit is fully assembled and tested.

Follow the steps to verify board operation: Caution: Do not

turn on the power supply or the electronic load until all the

connections are complete.

1. Connect a +3.3V power supply to the VDD connector,

and the ground of this power supply to the GND

connector.

2. Connect the positive terminal of the 0 to 100V DC

(VCM) power supply to the VSENSE+ input and the

negative terminal to the GND connector.

3. Set the VCM power supply to 50V.

4. Set the electronic load to sink 300mA.

5. Connect the positive terminal of the electronic load to

the VSENSE- input and the negative terminal of the

electronic load to the GND of the VCM power supply.

6. Connect REF1 to REF2.

7. Connect the positive terminal of the DC power supply

to the REF1/REF2 input. Set the DC power supply

voltage output to VDD/2 = 1.65V.

8. Connect the 8½ digital multimeter between the test

points RS+ and RS- to measure the differential input

voltage across the inputs (VSENSE).

9. Connect the 6½ digital multimeter across the VOUT

and REF1/REF2 test points to measure the MAX49918

output.

10. Turn on the power supplies, then the electronic load.

11. Enable the electronic load.

12. Verify that the 8½ digital multimeter displays 300mA x

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150mV.

13. The EV kit is now ready for further testing.

14. After the functions are verified, do not forget to turn off

the electronic load, calibrator, and power supply.

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EV Kit Photo

Table 1. Jumper Connection Guide

JUMPER

DEFAULT CONNECTION

FEATURE

Not Installed

2-3

Set the least bit of I2C device address to 0

1-2

Set the least bit of I2C device address to 1

1-2

Connect REF1 to VDD

2-3

Connect REF1 to GND

2-3

Connect REF2 to GND

1-2

Connect REF2 to VDD

Not Installed

Default options are in bold.

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MAX49918 Evaluation Kit

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Gain Control

To set the gain of the device, it is recommended to use the PICO board (MAX32625PICO board) and MAX49918EV kit

GUI software to control the gain. Or you need to use other devices or instruments to send I2C command to the MAX49918.

Gain Control with PICO Board and GUI

Please find and buy MAX32625PICO Board from www.analog.com.

Download the GUI (MAX49918 Evaluation Kit Tool) and firmware (usb_serial_bridge1.1.28.bin) from www.analog.com.

Install the MAX49918 Evaluation Kit Tool.

Solder the PICO board to the MAX49918 EV kit as shown in Figure 1.

Figure 1. MAX49918 EV Kit with PICO Board

Press and hold the button on the PICO board until it is connected to the computer with a USB cable. Wait around two

seconds for a new disk called 'MAINTENANCE' show up on the computer. Copy the firmware to the MAINTENANCE disk.

Eject the disk and reconnect the USB cable; the firmware uploading process is now complete.

Connect the power supply for VDD and VSENSE and switch on the power.

Open the GUI and click the Connect button. The GUI is shown in Figure 2. To set the gain, click the button with Gain on

it.

Figure 2. GUI–Gain Control

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MAX49918 Evaluation Kit

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I2C Address and data for Gain control

If the user wants to send I2C with another method, check the below I2C address and data.

The MAX49918 uses an input pin (A0) that determines the least-significative bit (LSB) of the I2C device address word

below.

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

The register address to set the gain is 0x00. And the data to set the gain is shown in the table below.

GAIN

100

160

200

Data (Hex)

Output Voltage

The MAX49918 has two reference inputs (REF1 and REF2) to set the device in either unidirectional or bidirectional

operation mode. Connect the REF1 and REF2 inputs to low-impedance voltage source(s) to set the MAX49918 output

(VOUT) reference level. Do not connect REF1 and REF2 inputs to any voltages lower than GND or higher than VDD. VREF

is defined as the average voltage of VREF1 and VREF2, i.e., the output voltage refers to VREF = (VREF1 + VREF2)/2.

Use the following equations to set the gain:

VOUT = VSENSE * GAIN + VREF

Where VSENSE = VRS+ - VRS-, and GAIN is the voltage gain of the MAX49918.

The default state of the EV kit is REF1 = VDD and REF2 = GND, i.e., it is in bidirectional mode with VREF = VDD/2.

Refer to the MAX49918 data sheet application information for more detail about the reference.

Ordering Information

PART

TYPE

MAX49918EVKIT#

EV Kit

#Denotes RoHS-compliance.

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MAX49918 Evaluation Kit

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MAX49918 EV Kit Bill of Materials

ITEM

REF_DES

DNI/DNP

QTY

MFG PART #

MANUFACTURER

VALUE

DESCRIPTION

A0, REF1,

REF2, SCL,

SDA, VDD,

VOUT,

VSENSE+,

VSENSE-

5010

KEYSTONE

N/A

TEST POINT; PIN DIA=0.125IN; TOTAL LENGTH=0.445IN; BOARD

HOLE=0.063IN; RED; PHOSPHOR BRONZE WIRE SIL;

C0603C104K4RAC;GCM

188R71C104KA37;

C1608X7R1C104K;GRM1

88R71C104KA01;

C0603X7R160-

104KNE;VJ0603Y104KXJ

CW1BC;

0603YC104KAT4A;88501

2206046

KEMET;

MURATA;

TDK;

MURATA;

VENKEL LTD;

VISHAY DALE;

AVX;

WURTH

ELECTRONICS INC

0.1UF

CAP; SMT (0603); 0.1UF; 10%; 16V; X7R; CERAMIC;

GRM21BR71C475KA73;0

805YC475KAT2A;GCM21

BR71C475KA73;CGA4J3

X7R1C475K125AE

MURATA;AVX;MURA

TA;TDK

4.7UF

CAP; SMT (0805); 4.7UF; 10%; 16V; X7R; CERAMIC

GND,

TP2-TP6

5011

KEYSTONE

N/A

TEST POINT; PIN DIA=0.125IN; TOTAL LENGTH=0.445IN; BOARD

HOLE=0.063IN; BLACK; PHOSPHOR BRONZE WIRE SILVER PLATE

FINISH;

J1-J5

PCC03SAAN

SULLINS

PCC03

SAAN

CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY; STRAIGHT

THROUGH; 3PINS; -65 DEGC TO +125 DEGC

PEC02SAAN

SULLINS

PEC02

SAAN

CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY; STRAIGHT;

2PINS

MTH1-MTH4

9032

KEYSTONE

9032

MACHINE FABRICATED; ROUND-THRU HOLE SPACER; NO THREAD;

M3.5; 5/8IN; NYLON

LVK12R050DE

OHMITE MFG CO.

0.05

RESISTOR; 1206; 0.05 OHM; 0.5%; 50PPM; 0.5W; METAL FILM

R3, R4, R7

CRCW06030000ZS;MCR

03EZPJ000;ERJ-

3GEY0R00;CR0603AJ/-

000ELF

VISHAY;ROHM

SEMICONDUCTOR;

PANASONIC;BOURN

RES; SMT (0603); 0; JUMPER; JUMPER; 0.1000W

R5, R6

ERJ-3GEYJ472

PANASONIC

4.7K

RES; SMT (0603); 4.7K; 5%; +/-200PPM/DEGC; 0.1000W

RS+, RS-

5000

KEYSTONE

N/A

TEST POINT; PIN DIA=0.1IN; TOTAL LENGTH=0.3IN; BOARD

HOLE=0.04IN; RED; PHOSPHOR BRONZE WIRE SILVER PLATE

FINISH;

MAX49918IATB+

ANALOG DEVICES

MAX49

918

BI-DIRECTIONAL WIDE MEASUREMENT RANGE WITH

PROGRAMMABLE GAIN CURRENT SENSE AMPLIFIER; PACKAGE

OUTLINE: 21-0137; PACKAGE LAND PATTERN DRAWING: 90-0003;

TDFN10-EP

PCB

MAX49918TDFN10

MAXIM

PCB

PCB:MAX49918TDFN10

C3, C4, C7

DNP

C1206C102K1RAC

KEMET

1000P

CAP; SMT (1206); 1000PF; 10%; 100V; X7R; CERAMIC

DNP

C0603C181K5GAC

KEMET

180PF

CAP; SMT (0603); 180PF; 10%; 50V; C0G; CERAMIC

TOTAL

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MAX49918 EV Kit Schematic

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Evaluation Board User Guide

MAX49918 Evaluation Kit

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MAX49918 EV Kit PCB Layout

MAX49918 EV Kit Component Placement Guide—Top

Silkscreen

MAX49918 EV Kit PCB Layout—Top

MAX49918 EV Kit PCB Layout—Bottom

MAX49918 EV Kit PCB Layout—Bottom Silkscreen

Revision History

REVISION

NUMBER

REVISION

DATE

DESCRIPTION

PAGES

CHANGED

7/23

Initial release



Evaluation Board User Guide

MAX49918 Evaluation Kit

ASSUMED BY ANALOG DEVICES FOR ITS USE, NOR FOR ANY INFRINGEMENTS OF PATENTS OR OTHER RIGHTS OF THIRD PARTIES THAT

MAY RESULT FROM ITS USE. SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE. NO LICENCE, EITHER EXPRESSED OR

IMPLIED, IS GRANTED UNDER ANY ADI PATENT RIGHT, COPYRIGHT, MASK WORK RIGHT, OR ANY OTHER ADI INTELLECTUAL PROPERTY

RIGHT RELATING TO ANY COMBINATION, MACHINE, OR PROCESS WHICH ADI PRODUCTS ALL INFORMATION CONTAINED HEREIN IS

PROVIDED “AS IS” WITHOUT REPRESENTATION OR WARRANTY. NO RESPONSIBILITY IS OR SERVICES ARE USED. TRADEMARKS AND

REGISTERED TRADEMARKS ARE THE PROPERTY OF THEIR RESPECTIVE OWNERS.

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