Texas Instruments BQ25171EVM Bedienungsanleitung

User’s Guide

BQ25171EVM Evaluation Module

ABSTRACT

This user’s guide describes the characteristics, operation, and use of the BQ25171EVM evaluation module

(EVM). This EVM is designed to help the user evaluate and test the various operating modes of the BQ25171.

This user’s guide includes setup instructions for the hardware and software, a schematic diagram, a bill of

materials (BOM), and PCB layout drawings for the evaluation module.

Throughout this user's guide, the abbreviations EVM, BQ25171EVM, BMS032, and the term evaluation module

are synonymous with the BMS032 evaluation module, unless otherwise noted.

Table of Contents

1 Introduction.............................................................................................................................................................................2

1.1 Printed Circuit Board Assembly......................................................................................................................................... 2

1.2 I/O Descriptions..................................................................................................................................................................2

2 Test Summary......................................................................................................................................................................... 3

2.1 Equipment.......................................................................................................................................................................... 3

2.2 Cautions............................................................................................................................................................................. 3

2.3 Test Instructions................................................................................................................................................................. 3

3 Board Layout, Schematic, and Bill of Materials...................................................................................................................4

3.1 Board Layout......................................................................................................................................................................4

3.2 Schematic........................................................................................................................................................................ 10

3.3 Bill of Materials................................................................................................................................................................. 11

4 Revision History................................................................................................................................................................... 14

Trademarks

All trademarks are the property of their respective owners.

WARNING

Hot surface! Contact may cause burns. Do not touch!

Some components may reach high temperatures >55°C when the board is powered on. The user

must not touch the board at any point during operation or immediately after operating, as high

temperatures may be present.

www.ti.com Table of Contents

SLUUCA3B – JULY 2020 – REVISED JULY 2021

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BQ25171EVM Evaluation Module 1

1 Introduction

The Texas Instruments BQ25171EVM is a multi-chemistry battery charger IC for 1-2 cell Li-Ion/LiFePO4/Li-

Polymer or 1-6 cell NiMH. Battery chemistry is programed using the CHM_TMR pin with external resistor.

Charging voltage can be adjusted using external resistors on VSET. Charging current can be set from 60mA to

600mA with external resistor on ISET.

1.1 Printed Circuit Board Assembly

The BQ25171EVM PCB contains the BQ25171 IC, LDO TPS7B8133 and support circuits. This board contains

several jumpers and connectors. S1 (VSET) allows selected output voltages to be programmed. R9 resistor

allows a wide range of adjustment of VSET. S2 (CHM_TMR) allows selection of select chemistry / timer. R10 is

used to select wider range of options. R22 can be used to change ISET value, fast charge current. R19 can be

used to adjust TS, battery temp sensor to simulate hot and cold fault.

1.2 I/O Descriptions

Table 1-1 lists the input and output connections available on this EVM and their respective descriptions.

Table 1-1. EVM I/O Connections

I/O Connector Description

J1 – VIN / GND

Input voltage from external power supply, recommended 5 V to 12 V

depending on output configuration. Max input voltage is 18 V, OVP

trip point and above this the device is off. Max input voltage is 40 V

while in OVP.

J2 – OUT (BAT+) / GND (BAT-) / GND / TS Interface with battery, can be up to 8.4 V out at 800 mA. TS should

be 10k NTC but not needed.

JP1 – REG / IN / OUT Source voltage for housekeeping regulator, U2. Default Input voltage

IN.

JP2 – CE Charge Enable Low=On, Hi=Off. Default Low.

JP3 – ISET Sets Fast Charge Current. Fixed 400 mA ADJ = R22 range 60 mA to

600 mA. Default Fixed.

JP4 – STAT1 LED, default setting is ON.

JP5 - STAT2 LED, default setting is ON.

JP6 – TS NTC temp sensor. Fixed = 10k (safe) ADJ=R19 range from 0 to 50k

Ω. Default Fixed.

JP7 – CHM/TMR ADJ Disable R10 Default is installed.

JP8 – VSET ADJ Disable R9 Default is installed.

Table 1-2 lists the S1 switch positions for VSET and their respective descriptions. Use only one postion ON, do

not combine.

Table 1-2. VSET S1 Switch Positions

Position / RX / Value Li+Voltage / Configuration NiMH Voltage / Configuration

#1 / R1 / 82k Ω 3.6V / 1-Cell LiFePO4 No Charge (Open Circuit)

#2 / R2 / 47k Ω 3.8V / 1-Cell Li-Ion 1-Cell / Intermittent Charge

#3 / R3 / 24k Ω 4.1V / 1-Cell Li-Ion 3-Cell

#4 / R4 / 18k Ω 4.2V / 1-Cell Li-Ion 3-Cell / Intermittent Charge

#5 / R5 / 8.2k Ω 7.2V / 2 -Cell LiFePO4 5-Cell

#6 / R6 / 6.2k Ω 7.4V / 2 -Cell LiFePO4 5-Cell / Intermittent Charge

#7 / R7 / 3.6k Ω 8.4V / 2 -Cell Li-Ion 6-Cell / Intermittent Charge

#8 / R8 / 0 Ω Short Circuit – No Charge Short Circuit – No Charge

Introduction www.ti.com

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Table 1-3 lists the S2 switch positions for CHM_TMR and their respective descriptions. Use only one postion ON,

do not combine.

Table 1-3. CHM_TMR S2 Switch Positions

Position/RX/Value Chemistry/Timer

#1 / R11 / 75k Ω Li-Ion / 10 hr

#2 / R12 / 56k Ω Li-Ion / Timer Disabled

#3 / R13 / 18k Ω NiMH / 10 hr

#4 / R14 / 0 Short Circuit / No Charge

2 Test Summary

This section describes the jumpers and connectors on the EVM as well as how to properly connect, setup, and

use the BQ25171EVM. Note that the default jumper setting of headers are marked with two dots to indicate the

shorting jumper position. This will put the unit into a single cell Li-Ion configuration, 4.2 V at 400 mA.

2.1 Equipment

This section includes a list of supplies required to perform tests on this EVM.

1. Battery simulator such as kiethly 2400 or equilvalent. Or a single/dual-cell battery.

2. Power supply, for single cell 5V 1A input, for dual cell 12V 1A input . Note that unit can operate up to 18V

input.

3. Voltage meter and current meter.

2.2 Cautions

To prevent possible damage to battery under test verify that charging conditions of the cell are not exceeded.

Check max charge voltage and current.

Power dissipation of the device can be exceeded with too high an input to output voltage drop and current.

Thermal regulation begins reducing current at 125 °C, at 150 °C device will shut off.

Device can get hot during high input-to-output voltage drop and high current conditions. Use caution when

handling the board.

2.3 Test Instructions

In order for this EVM to operate properly, the following components must be connected and properly configured.

The configuration below will put the EVM in a single cell Li-Ion charger configuration.

1. Set input power supply to 5 V and Battery Simulator to 3.6 V with compliance to support 400 mA. Turn off

Supply and Batter Simulator.

2. Connect input voltages to J1 and Battery Simulator J2 to the EVM.

3. Configure all EVM jumpers to factory setting, see Table 2-1.

4. Turn on all supplies and loads

a. 5 V Input supply current limit should be greater than 500 mA

b. Out voltage should be 3.6 V and charge current 400 mA

c. LED D1 will be ON, Normal charge. D3 is OFF

5. Simulate battery completing charge by increasing Battery Simulator voltage to 4.2 V.

a. Current will decrease to 0 mA.

b. LED D2 will switch to OFF.

www.ti.com Test Summary

SLUUCA3B – JULY 2020 – REVISED JULY 2021

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BQ25171EVM Evaluation Module 3

Table 2-1. Jumper Factory Setting

I/O Connector Factory Setting

JP1 IN

JP2 ON

JP3 Fixed

JP4 Installed

JP5 Installed

JP6 Fixed

JP7 Installed

JP8 Installed

S1 Position 4

S2 Position 1

Note

IN, ON, Fixed are positions of a 3 pin header. If it is a 2 pin header then it is installed or not installed.

3 Board Layout, Schematic, and Bill of Materials

3.1 Board Layout

The board layout is shown in Figure 3-1 to Figure 3-6.

Figure 3-1. Top Overlay

Board Layout, Schematic, and Bill of Materials www.ti.com

4BQ25171EVM Evaluation Module SLUUCA3B – JULY 2020 – REVISED JULY 2021

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Figure 3-2. Top Solder

www.ti.com Board Layout, Schematic, and Bill of Materials

SLUUCA3B – JULY 2020 – REVISED JULY 2021

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BQ25171EVM Evaluation Module 5

Figure 3-3. Top Layer

Board Layout, Schematic, and Bill of Materials www.ti.com

6BQ25171EVM Evaluation Module SLUUCA3B – JULY 2020 – REVISED JULY 2021

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Figure 3-4. Bottom Layer

www.ti.com Board Layout, Schematic, and Bill of Materials

SLUUCA3B – JULY 2020 – REVISED JULY 2021

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BQ25171EVM Evaluation Module 7

Figure 3-5. Bottom Solder

Board Layout, Schematic, and Bill of Materials www.ti.com

8BQ25171EVM Evaluation Module SLUUCA3B – JULY 2020 – REVISED JULY 2021

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Figure 3-6. Bottom Overlay

www.ti.com Board Layout, Schematic, and Bill of Materials

SLUUCA3B – JULY 2020 – REVISED JULY 2021

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BQ25171EVM Evaluation Module 9

3.2 Schematic

The BQ25171EVM schematic is shown in Figure 3-7.

Figure 3-7. Schematic

Board Layout, Schematic, and Bill of Materials www.ti.com

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