Texas Instruments LP877451Q1EVM, User Manual

3 Jumpers and connectors

The LP877451Q1EVM has many terminal blocks, jumpers and test points to offer certain flexibility to help users 
to verify the EVM according to their application conditions. However, EVM is pre-configured with default jumper 
settings and users can power up the regulators without the need of jumper modifications. Setting these jumpers 
correctly for the correct function of the EVM is important. 

Table 3-1

 lists all the terminal blocks on the EVM and 

Table 3-2

 lists the jumpers and their functionality. All the terminal blocks are marked with polarity and Pin 1 of 

test points / jumpers are marked with white dot for identification purpose. To understand more about the jumper 
functionality, see the schematic diagrams in 

Section 6.1

.

Table 3-1. Terminal Blocks

Terminal Block Number

Terminal Block Name

Description

J1

VIN 3.3V

3.3 V External Input Voltage

J20

VIO_LDO

Terminal block for VIO_LDO 
Output

J21

BOOST

Terminal block for BOOST Output

J27

BUCK3

Terminal block for BUCK3 Output

J29

BUCK1

Terminal block for BUCK1 Output

J31

BUCK2

Terminal block for BUCK2 Output

J33

J33

USB Connector

J35

VBAT

5 V - 20 V Input

Table 3-2. Configuration Jumpers

Jumper/Connector Number

Jumper/Connector Name

Configuration

Description

J3

VIO_SEL

Pins 1 and 2

3.3 V supply generated from USB 
supply

Pins 2 and 3 (Default)

3.3 V VIO supply generated from 
PMIC VIO_LDO

J4

SDI_SPI

Pins 1 and 2 (Default)

Connects PMIC SDI_SPI signal 
to MCU SDO_SPI port directly

Pins 2 and 3

Connects PMIC SDI_SPI signal 
to MCU SDO_SPI port through a 
level shifter (series resistors need 
to be mounted if this option is 
used)

J5

EN_PVIN_3V3

Closed (Default)

Connects PMIC ENABLE pin 
to PVIN_Bx pins (PVIN_3V3) 
through a pull up resistor and 
device gets enabled as soon as 
3.3 V is generated/applied

Open

If PMIC needs to be enabled 
through USB/GUI or through pre-
regulator PGOOD signal, then 
this jumper must be kept open

J6

SCLK_SPI

Pins 1 and 2 (Default)

Connects PMIC SCLK_SPI signal 
to MCU SCLK_SPI port directly

Pins 2 and 3

Connects PMIC SCLK_SPI signal 
to MCU SCLK_SPI port through a 
level shifter (series resistors need 
to be mounted if this option is 
used)

J7

SDO_SPI

Pins 1 and 2 (Default)

Connects PMIC SDO_SPI signal 
to MCU SDI_SPI port directly

Pins 2 and 3

Connects PMIC SDO_SPI signal 
to MCU SDI_SPI port through a 
level shifter (series resistors need 
to be mounted if this option is 
used)

Jumpers and connectors

www.ti.com

4

LP877451Q1EVM Evaluation Module

SNVU769 – SEPTEMBER 2021

Submit Document Feedback

Copyright © 2021 Texas Instruments Incorporated