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MAX77680/MAX77681
Evaluation Kit
Evaluates: MAX77680/MAX77681
General Description
The MAX77680/MAX77681 evaluation kit (EV kit) is a
fully assembled and tested printed circuit board (PCB)
that demonstrates the MAX77680/MAX77681. The EV kit
allows for easy evaluation of the MAX77680/MAX77681
resources, including the SIMO and I
2
C interface.
Windows
®
-based software provides a user-friendly graph-
ical interface as well as a detailed register-based interface
to exercise the features of the MAX77680/MAX77681.
Ordering Information
appears at end of data sheet.
Benefits and Features
●
Easy to Use
• GUI Drives I
2
C Interface
• Fully Assembled and Tested
●
Emulates System Loading
• On-Board Electronic Load for SIMO Buck-Boost
Outputs
• Electronic Load has Steady-State, Transient, and
Random Modes
●
Evaluates Both Push-Button and Slider-Switch
On-Key Options
Figure 1. MAX77680/MAX77681 EV Kit Photo
Windows is a registered trademark and registered service mark
of Microsoft Corporation.
319-100213; Rev 1; 8/18
MAX77680/MAX77681
Evaluation Kit
Quick Start
2)
3)
4)
Evaluates: MAX77680/MAX77681
Follow this procedure to familiarize yourself with the EV kit.
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.
Required Equipment
●
●
●
●
●
●
●
Windows-based PC
Power supply
Ammeter
DVM
Micro-USB cable
GUI
5)
MAX77680/MAX77681 EV kit
6)
7)
8)
Procedure
1)
Install all shunts as recommended in
Table 1.
Connect a Micro-B USB cable between the EV kit’s
J6 and your Windows-based PC.
Apply a 3.7V supply (set for 100mA current limit)
through an ammeter (set for 10mA range) across
the SYS and GND2 terminals of the EV kit. Turn the
supply on.
Open the GUI and press the
Connect
button in the
upper left corner. Wait for the device to respond, and
in the
Synchronize
window, press the
Read and
close
button.
Press the on-key (SW1) for approximately 1 second,
then release the on-key.
Confirm with the ammeter that the quiescent current
is approximately 37.5µA.
Connect a DVM to SBB0, SBB1, and SBB2. For the
MAX77680A, 1.8V, 1.2V, and 3.3V appear, respec-
tively. For the MAX77681A, 1.8V, 3.3V, and 5.0V
appear, respectively.
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation.
Visit the product webpage at
www.maximinte-
grated.com/max77680evkit
and navigate to
Design
Resources
to download the latest version of the EV
kit software. Save the EV kit software to a temporary
folder and decompress the ZIP file.
This concludes the Quick Start procedure. Users are now
encouraged to explore the device and its register settings
with the GUI. During general device evaluation, set the
ammeter range to greater than or equal to 1A to minimize
the impact of its series resistance.
For more information on the GUI, see the
Software
section.
Table 1. Default Shunt Positions and Jumper Descriptions
REFERENCE
DESIGNATOR
J100
J101
J200
J201
J202
J203
J204
J205
J2
J4
J5
J6
J8
DEFAULT
POSITION
N/A
1-2
1-2
1-2
1-2
1-2
1-2
1-2
N/A
1-2
2-3
N/A
1-2
Do not connect shunts to J100.
1-2:
Connects a VIO to the 3.3V EV kit logic rail.
3-4:
Connects a VIO to the 1.8V EV kit logic rail.
1-2:
Connects the U200 amplifier to the gate of the Q200 load FET.
1-2:
Connects SBB0 to load cell.
1-2:
Connects the U202 amplifier to the gate of the Q202 load FET.
1-2:
Connects SBB1 to load cell.
1-2:
Connects the U204 amplifier to the gate of the Q204 load FET.
1-2:
Connects SBB2 to load cell.
Do not connect shunts to J2.
1-2:
Connects PWRHLD to VIO.
2-3:
Connects PWRHLD to GND.
1-2:
Connects nEN to SW2.
2-3:
Connects nEN to SW1.
USB-Micro adapter for communications to a user PC (and use the GUI).
1-2:
Connects nRST to PWRHLD through a 150Ω resistor.
FUNCTION
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