Analog Devices EVAL-MAX49918 User manual

Evaluation Board User Guide
EVAL-MAX49918 Evaluation Kit
Evaluates: MAX49918
319-101014; Rev 0; 7/23
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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
•
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

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.

Evaluation Board User Guide
MAX49918 Evaluation Kit
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EV Kit Photo
Table 1. Jumper Connection Guide
JUMPER
DEFAULT CONNECTION
FEATURE
J1
Not Installed
J2
Not Installed
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.

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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

Evaluation Board User Guide
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
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
PART
TYPE
MAX49918EVKIT#
EV Kit
#Denotes RoHS-compliance.

Evaluation Board User Guide
MAX49918 Evaluation Kit
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MAX49918 EV Kit Bill of Materials
ITEM
REF_DES
DNI/DNP
QTY
MFG PART #
MANUFACTURER
VALUE
DESCRIPTION
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

Evaluation Board User Guide
MAX49918 Evaluation Kit
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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
0
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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