ANALOG DEVICES MAX49918 Evaluation Board Kit

Product Information

The MAX49918 evaluation kit (EV kit) is a fully tested and assembled circuit that demonstrates the capabilities of the MAX49918. The MAX49918 is a high- precision, wide measurement range, programmable gain, bidirectional current- sense amplifier that monitors two distinct current levels. The gain of the MAX49918 is programmed by I2C communication. The EV kit also includes a PCB footprint for soldering a MAX32625PICO board, which allows users to control the gain conveniently with GUI software.

Product Usage Instructions

1. Required Equipment:
   • +3.3V power supply
   • 0 to 100V DC (VCM) power supply
   • Electronic load
2. Optional Equipment:
   • MAX32625PICO Board
   • GUI software
3. Procedure:
4. Connect a +3.3V power supply to the VDD connector, and connect the ground of this power supply to the GND connector.
5. 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.
6. Set the VCM power supply to 50V.
7. Set the electronic load to sink 300mA.
8. Connect the positive terminal of the electronic load to [specific connection not mentioned in the extract]

Gain Control Instructions

To set the gain of the MAX49918 device, you have two options:

1. Option 1: Use the PICO board (MAX32625PICO board) and MAX49918 EV kit GUI software to control the gain.
2. Find and buy the MAX32625PICO Board from www.analog.com.
3. Download the GUI (MAX49918 Evaluation Kit Tool) and firmware (usb_serial_bridge1.1.28.bin) from www.analog.com.
4. Install the MAX49918 Evaluation Kit Tool.
5. Solder the PICO board to the MAX49918 EV kit as shown in Figure 1.
6. Press and hold the button on the PICO board until it is connected to the computer with a USB cable.
7. Wait around two seconds for a new disk called ‘MAINTENANCE’ to show up on the computer.
8. Copy the firmware to the MAINTENANCE disk.
9. Eject the disk and reconnect the USB cable; the firmware uploading process is now complete.
10. Option 2: Use other devices or instruments to send I2C commands to the MAX49918.

General Description And Features

• 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)
• ±1μV (typ) Input Offset Voltage for REF1 = REF2 = VDD/2
• ±5μV (typ) Input Offset Voltage for REF1 = VDD and 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

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 50mΩ = +15mV and the 6½ digital multimeter displays 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.

EV Kit Photo And Connection Guide

EV Kit Photo

Table 1. Jumper Connection Guide

J3

| 2- 3| Set the least bit of I2C device address to 0
1-2| Set the least bit of I2C device address to 1

J4

| 1- 2| Connect REF1 to VDD
2-3| Connect REF1 to GND

J5

| 2- 3| Connect REF2 to GND
1-2| Connect REF2 to VDD
J6| Not Installed|

• Default options are in bold.

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.

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
---|---|---|---|---|---|---
1| 1| 0| 0| 1| 0| A0

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

GAIN| 10| 20| 40| 50| 80| 100| 160| 200
---|---|---|---|---|---|---|---|---
Data (Hex)| 0| 1| 2| 3| 4| 5| 6| 7

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

• Denotes RoHS-compliance.

MAX49918 EV Kit Bill of Materials

1

| A0, REF1, REF2, SCL, SDA, VDD, VOUT, VSENSE+,

VSENSE-

| ****

–

| ****

9

| ****

5010

| ****

KEYSTONE

| ****

N/A

| ****

TEST POINT; PIN DIA=0.125IN; TOTAL LENGTH=0.445IN; BOARD HOLE=0.063IN; RED; PHOSPHOR BRONZE WIRE SIL;

2

| ****

C1

| ****

–

| ****

1

| 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;

3

| ****

C2

| ****

–

| ****

1

| GRM21BR71C475KA73;0 805YC475KAT2A;GCM21 BR71C475KA73;CGA4J3

X7R1C475K125AE

| ****

MURATA;AVX;MURA TA;TDK

| ****

4.7UF

| ****

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

4

| GND, TP2-TP6| ****

–

| ****

6

| ****

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;

5| J1-J5| –| 5| PCC03SAAN| SULLINS| PCC03 SAAN| CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY; STRAIGHT THROUGH; 3PINS; -65 DEGC TO +125 DEGC
6| J6| –| 1| PEC02SAAN| SULLINS| PEC02 SAAN| CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY; STRAIGHT; 2PINS
7| MTH1-MTH4| –| 4| 9032| KEYSTONE| 9032| MACHINE FABRICATED; ROUND-THRU HOLE SPACER; NO THREAD; M3.5; 5/8IN; NYLON
8| R1| –| 1| LVK12R050DE| OHMITE MFG CO.| 0.05| RESISTOR; 1206; 0.05 OHM; 0.5%; 50PPM; 0.5W; METAL FILM

9

| ****

R3, R4, R7

| ****

–

| ****

3

| CRCW06030000ZS;MCR 03EZPJ000;ERJ-

3GEY0R00;CR0603AJ/-

000ELF

| VISHAY;ROHM SEMICONDUCTOR; PANASONIC;BOURN

S

| ****

0

| ****

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

10| R5, R6| –| 2| ERJ-3GEYJ472| PANASONIC| 4.7K| RES; SMT (0603); 4.7K; 5%; +/-200PPM/DEGC; 0.1000W

11

| ****

RS+, RS-

| ****

–

| ****

2

| ****

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;

12

| ****

U1

| ****

–

| ****

1

| ****

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

14| PCB| –| 1| MAX49918TDFN10| MAXIM| PCB| PCB:MAX49918TDFN10
15| C3, C4, C7| DNP| 0| C1206C102K1RAC| KEMET| 1000P F| CAP; SMT (1206); 1000PF; 10%; 100V; X7R; CERAMIC
16| C9| DNP| 0| C0603C181K5GAC| KEMET| 180PF| CAP; SMT (0603); 180PF; 10%; 50V; C0G; CERAMIC
TOTAL|  |  | 38|  |  |  |

MAX49918 EV Kit Schematic

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
---|---|---|---
0| 7/23| Initial release| —

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.

Contact

• One Analog Wa y, Wi lmington, MA 01887 – 2356, U.S.A.
• Tel: 781.329.4700
• analog.com

©2023 Analog Devices,Inc. All rights reserved.

References

• Mixed-signal and digital signal processing ICs | Analog Devices
• Document Feedback Form | Analog Devices
• Mixed-signal and digital signal processing ICs | Analog Devices

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