Texas Instruments LP87745-Q1, Руководство пользователя

Страница: 8 / 23

4 Getting Started
In its default configuration, conn12 V and GND to the VBAT terminal block (J33) will power up the EVM.
While loading the regulators, ensure that input power supply has sufficient current source capabilities to avoid
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 describes the jumper settings for different supply options.
Table 4-1. Jumper Connections for Powering the EVM
Power Source Input Voltage Range Jumpers
VBAT 5 V - 20 V Both 3V3_PREREG jumpers in J4 (Default option).
Leave J5 open.
Vin 3.3V 3.1 V - 3.5 V Remove 3V3_PREREG jumpers on J4 and place
them on 3V3_PS position on J4. With this
configuration, do not apply power to VBAT terminal.
Leave J5 open.
USB 5 V USB cable J5, 3V3_USB. With this option, jumpers on J4 must
be removed.
The LP877451Q1EVM 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
Table 3-2 and GUI section for more information about configuring jumpers
and using GUI.
4.1 GUI
Texas Instruments provides a simple to use LP87745-Q1 GUI tool to enable, configure, and evaluate the various
features of the LP87745-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 will run 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 will get 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 to it will re-establish the connection. The GUI uses the
ACCtrl COM port which can be found from the device manager of the operating system.
4.2 GUI Installation and working with GUI
The GUI can be found here and it can be run in browser or it can be installed to the computer. Figure 4-1 shows
the default interface of GUI. Please refer to the README.md file in the GUI tool for a complete guide on how to
use the tool.
Getting Started www.ti.com
8 LP877451Q1EVM Evaluation Module SNVU769A – SEPTEMBER 2021 – REVISED OCTOBER 2022
Submit Document Feedback
Copyright © 2022 Texas Instruments Incorporated