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MAX17261G/MAX17261X
Evaluation Kits
Evaluates: MAX17261
General Description
The MAX17261G/MAX17261X evaluation kits (EV kits)
are fully assembled and tested surface-mount PCBs that
evaluate the stand-alone ModelGauge™ m5 host-side
fuel-gauge ICs for lithium-ion (Li+) batteries in handheld
and portable equipment.
The MAX17261G/MAX17261X EV kits include the Maxim
DS91230+ USB interface, IC evaluation board, and
RJ-11 connection cable. Windows
®
-based graphical user
interface (GUI) software is available for use with the EV
kits and can be downloaded from Maxim’s website at
www.maximintegrated.com/products/MAX17261
(under the Design Resources tab). Windows 7 or newer
Windows operating system is required to use with the EV
kit GUI software.
Quick Start
Required Equipment
●
●
●
●
●
●
●
MAX17261G/MAX17261X EV kit
Lithium battery pack of desired configuration
Battery charger or power supply
Load circuit
DS91230+ USB adapter
RJ-11 6pos reverse modular cord
PC with Windows 7 or newer Windows operating
system and USB port
Features and Benefits
●
ModelGauge m5 Algorithm
●
Monitors from 2S+ Cell Packs
●
Battery Pack Input Voltage Range of +4.6V to +39.2V
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Thermistor Measurement Network
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Optional On-Board PCB Trace Sense Resistor
●
Windows 7 or Newer Compatible Software
●
Proven PCB Layout
●
Fully Assembled and Tested
Note:
In the following sections, software-related items are
identified by bolding. Text in
bold
refers to items directly
from the EV kit software. Text in
bold and underlined
refers to items from the Windows operating system.
Procedure
The EV kits are fully assembled and tested. Follow the
steps below to install the EV kit software, make required
hardware connections, and start operation of the kits. The
EV kit software can be run without hardware attached. It
automatically locates the hardware when connections are
made. Note that after communication is established, the
IC must still be configured correctly for the fuel gauge to
be accurate.
1)
Visit
www.maximintegrated.com/products/MAX17261
under the Design Resources tab to download the
latest version of the EV kit software. Save the EV kit
software to a temporary folder and unpack the ZIP
file.
Install the EV kit software on your computer by
running the MAX17261_Vx_x_x_Install.exe program
inside the temporary folder. The program files are
copied, and icons are created in the Windows
Start
menu. The software requires the .NET Framework
4.5 or later. If you are connected to the Internet,
Windows automatically updates .NET framework as
needed.
The EV kit software launches automatically after
MAX17261 EV Kit Files
FILE
MAX17261_Vx_x_x_Install.exe
DECRIPTION
Installs all EV kit files on
your computer.
2)
Ordering Information
appears at end of data sheet.
3)
Windows is a registered trademark and registered service mark
of Microsoft Corporation.
319-100204; Rev 0; 5/18
MAX17261G/MAX17261X
Evaluation Kits
install or alternatively it can be launched by clicking
on its icon in the Windows
Start
menu.
Connect the DS91230+ adaptor to a USB port on the
PC. The DS91230+ is a HID device and is located
automatically by Windows without the need to install
additional drivers.
Make connections to the EV kit board based on cell
pack configuration as shown in
Figure 1.
The load or
charger circuit can be connected at this time as well.
The cell connects between the PACK- and PACK+
pads and the charger/load connects between the
SYSGND and SYSPWR pads. Connect a jumper
on P1 to choose from 2S, 3S, 4S, 6S, and 8S
configuration.
Connect the RJ-11 cable between the USB adapter
and the EV kit board. The GUI software establishes
communication automatically.
At power up the IC defaults to EZ Configuration, if
you have a custom .INI file for your application, it can
be loaded at this time.
Evaluates: MAX17261
4)
The MAX17261G/MAX17261X EV kit boards provide a
variety of features that highlight the functionality of the IC.
The following sections detail the most important aspects
of the EV kit board.
Communication Connections
5)
6)
7)
The RJ-11 connector provides all signal lines necessary
for I
2
C communication between the IC and the software
GUI interface. When developing code separately, connec-
tions to the communication lines can be made directly to
the board.
Table 1
summarizes the connections. The user
must apply the appropriate external pullup resistors to the
communication lines when not using the DS91230+ com-
munication interface.
Table 1. Communication Line Solder Points
COMMUNICATION LINE
SDA
SCL
GND
CONNECTION POINT
J11
J12
J13
Detailed Description of Hardware
J6
Pack +
(2S+)
J7
SYSPWR
(2S+)
J8
ALRT
J11
SDA
J12
SCL
J13
SYSGND
+
CELLS
Series Cell
Count Seelction
MAX17261G/MAX17261X
J1
RJ-11
PC
CHARGER/LOAD
-
PROTECTOR
CIRCUIT
J5
Pack -
J4
SYSGND
J3
RT1+
J2
RT1-
Figure 1. MAX17261 Board Connections
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Maxim Integrated
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MAX17261G/MAX17261X
Evaluation Kits
External Thermistor
Evaluates: MAX17261
The MAX17261 can be configured to use internal
temperature measurements or an external thermistor. All
EV kit boards come with a thermistor installed as surface
mount component RT1. If the application requires direct
thermal contact to the cells, RT1 can be removed and
replaced with a leaded thermistor connected between the
RT1+/RT1- solder pads (J2 and J3).
Detailed Description of Software
The MAX17261G/MAX17261X evaluation kit software
gives the user complete control of all functions of the
MAX17261, as well as the ability to load a custom model
into the ICs. Separate control tabs allow the user access
to view real-time updates of all monitored parameters.
The software also incorporates a data-logging feature to
monitor a cell over time.
Sense Resistor Options
All EV kit boards are shipped with an 0805 size 0.010Ω
chip sense resistor installed. Oversized land pattern
pads allow for different size sense resistors to be used
if desired. Also, each board contains an optional 0.003Ω
copper trace sense resistor that can be enabled if desired.
To do so, the chip sense resistor must be removed and
0Ω jumpers must be resoldered to change the circuit.
Table 2
summarizes the changes. Note that the IC must
be reconfigured to support the new resistor type.
Software Installation
The software requires Windows 7 or newer operating
system. .NET version 4.5 is required for operation and
is automatically installed if an older version of .NET
framework is detected. To install the evaluation software,
exit all programs currently running and unzip the provided
MAX17261 Installation Package zipped file.
Double click the MAX17261_Vx_x_x Install.exe icon and
the installation process begins. Follow the prompts to
complete the installation. The evaluation software can be
uninstalled in the Add/Remove programs tool in the Control
Panel. After the installation is complete, open the Maxim
Integrated/MAX17261 folder and run MAX17261.exe or
select it from the program menu.
Figure 2
shows a splash
screen containing information about the evaluation kit that
appears while program is loading.
Series Cell selection
The MAX17261G/MAX17261X evaluation kit has a jumper
selection for the series cell count. Select the appropriate
series cell count on the P1 jumper for 2S, 3S, 4S, 6S, or 8S
cells. For alternate cell counts, the resistors on the board
have to be modified based on the equations in the data
sheet. It is recommended to select 2S on the P1 header,
and replace R18 with the appropriate sized resistor.
Power for MAX17261 is supplied through a simple
regulator made from D1, R14, and Q2. Q2 is rated for 50V
input. For larger input voltages, replace Q2 with a FET of
appropriate voltage rating.
Table 2. Sense Resistor Selection for MAX17261
COMPONENT
R3
R4
R5
R6
VALUE FOR CHIP SENSE
0Ω
Not populated
Desired sense value
Not populated
VALUE FOR BOARD TRACE SENSE
Not populated
0Ω
Not populated
0Ω (R7 is trace resistor)
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Maxim Integrated
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MAX17261G/MAX17261X
Evaluation Kits
Evaluates: MAX17261
Figure 2. EV Kit Splash Screen
Figure 3. EV Kit Bottom Status Bar
Communication Port
The EV kit software automatically finds the DS91230+
adapter when connected to any USB port. Communication
status is shown on the right-hand side of the bottom
status bar. See
Figure 3.
If the adapter cannot be found,
a “No USB Adapter” message is displayed. If the adapter
is found, but the IC daughter board cannot be found,
a “No Slave Device” message is displayed. Otherwise,
if communication is valid, a green bar updates as the
software continuously reads the IC registers.
If the DS91230+ is connected, the status bar should be
active. The bottom status bar also displays information on
data logging status, the communication mode, hibernation
status, selected current-sense resistor value, device
serial number, and the EV kit GUIs version number.
Program Tabs
All functions of the program are divided under four tabs
in the main program window. Click on the appropriate
tab to move to the desired function page. Located on
the
ModelGauge m5
tab is the primary user information
measured and calculated by the IC. The
Graphs
tab
visually displays fuel gauge register changes over time.
The
Registers
tab allows the user to modify common fuel
gauge registers one at a time. The
Configure
tab allows
for special operations such as initializing the fuel gauge
logging and performing fuel gauge reset. All tabs are
described in more detail in the following sections.
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MAX17261G/MAX17261X
Evaluation Kits
ModelGauge m5 Tab
Measurements
Evaluates: MAX17261
The
ModelGauge m5
tab displays the important output
information read from the IC.
Figure 4
shows the format
of the ModelGauge m5 Tab. Information is grouped by
function and each is detailed separately.
The
Measurements
group box displays ADC
measurements that are used by the fuel gauge to
determine state-of-charge.
State-of-Charge
Alerts
The
State-of-Charge
group box displays the main output
information from the fuel gauge: state-of-charge of the
cell, remaining capacity, time-to-full, and time-to-empty.
The
Alerts
group box tracks all eleven possible alert
trigger conditions. If any alert occurs, the corresponding
checkbox is checked for the user to see. The clear alerts
button resets all alert flags.
Cell Information
At Rate
The
Cell Information
group box displays information
related to the health of the cell such as the cell’s age,
internal resistance, present capacity, number of equivalent
full cycles, and change in capacity from when it was new.
The
At Rate
group box allows the user to input a
hypothetical load current and the fuel gauge calculates
the corresponding hypothetical Qresidual, TTE, AvSOC,
and AvCap values.
Figure 4. ModelGauge m5 Tab
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