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4 Getting Started
In default configuration of EVM, connecting +12 V and GND to the VBAT terminal block (J33) powers up the
EVM. While loading the regulators, make sure that input power supply has sufficient current source capabilities
to prevent supply voltage collapse due to current limiting.
EVM can also be powered through external 3.3 V input supply or through USB power by modifying jumper
settings on the EVM.
Table 4-1
Power Source
VBAT
Vin 3.3 V
USB
The LP87725Q1EVM does not require any specific power-down sequence. The EVM can be powered down
by turning off the power supply or by toggling the EN Pin off in the GUI, if the GUI control signal is used to
enable/disable the device. Refer to
GUI.
4.1 GUI
Texas Instruments provides a simple to use LP87725-Q1 GUI tool to enable, configure, and evaluate the various
features of the LP87725-Q1 device on the EVM. Please refer to the GUI README.md file in the GUI tool's
Help->View README.md tab for a more detailed description of this tool.
The GUI runs on most PC platforms and requires a USB port for connecting the EVM to the host computer.
The EVM USB connector is type-C and a type-A to type-C cable is provided along with the EVM to connect to
the host computer. EVM gets automatically connected to the GUI after the USB cable is connected and manual
assignment of COM port is not necessary. If Hardware not Connected displays on the bottom left of the GUI,
clicking Click to connect to hardware icon next re-establish the connection. The GUI uses the ACCtrl COM port
which can be found from the device manager of the operating system.
SNVU851 – NOVEMBER 2023
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describes the jumper settings for different supply options.
Table 4-1. Jumper Connections for Powering the EVM
Input Voltage Range
Both 3V3_PREREG jumpers on J4 (Default option).
5 V - 20 V
Leave J5 open.
Remove 3V3_PREREG jumpers on J4 and place them
3.1 V - 3.5 V
on 3V3_PS position on J4. With this configuration, do not
apply power to VBAT terminal. Leave J5 open.
J5, 3V3_USB. With this option, jumpers on J4 must be
5 V USB cable
removed.
Table 3-2
and
GUI
Copyright © 2023 Texas Instruments Incorporated
Jumpers
for more information about configuring jumpers and using
Getting Started
LP87725Q1EVM Evaluation Module
7
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