Texas Instruments BQ25672EVM User manual

User’s Guide

BQ25672 Evaluation Module

ABSTRACT

This user's guide describes the characteristics, operation, and functionality of the BQ25672 Evaluation Module

(EVM). The document also describes the equipment, test setup, and software required to operate the EVM. A

complete schematic diagram, printed-circuit board (PCB) layouts, and bill of materials (BOM) are also included in

this document.

Throughout this user's guide, the abbreviations and terms EVM, BQ25672EVM, BMS034, and evaluation

module are synonymous with the BQ25672 EVM. Note that the BQ25672 EVM is not yet available for order.

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.

Table of Contents

1 Introduction.............................................................................................................................................................................3

1.1 EVM Features.................................................................................................................................................................... 3

1.2 I/O Descriptions..................................................................................................................................................................4

1.3 Recommended Operating Conditions................................................................................................................................ 6

2 Test Setup and Results ......................................................................................................................................................... 7

2.1 Equipment.......................................................................................................................................................................... 7

2.2 Equipment Setup................................................................................................................................................................7

2.3 Software Setup...................................................................................................................................................................8

2.4 Test Procedure................................................................................................................................................................... 9

3 PCB Layout Guidelines........................................................................................................................................................ 11

4 Board Layout, Schematic and Bill of Materials..................................................................................................................12

4.1 BMS034E1 Board Layout.................................................................................................................................................12

4.2 BQ25672EVM (BMS034E1-004) Schematic....................................................................................................................16

4.3 Bill of Materials ................................................................................................................................................................18

5 Revision History................................................................................................................................................................... 23

List of Figures

Figure 2-1. Equipment Test Setup for Testing Battery Charging..................................................................................................8

Figure 4-1. BMS034E2/A Top Layer.......................................................................................................................................... 12

Figure 4-2. BMS034E2/A Signal Layer 1...................................................................................................................................13

Figure 4-3. BMS034E2/A Signal Layer 2...................................................................................................................................14

Figure 4-4. BMS034E2/A Bottom Layer.................................................................................................................................... 15

Figure 4-5. BQ25672EVM (BMS034E2/A-004) Schematic Page 1........................................................................................... 16

Figure 4-6. BQ25672EVM (BMS034E2/A-004) Schematic Page 2........................................................................................... 17

List of Tables

Table 1-1. Device Data Sheet...................................................................................................................................................... 3

Table 1-2. EVM Connections....................................................................................................................................................... 4

Table 1-3. EVM Shunt and Switch Installation............................................................................................................................. 4

www.ti.com Table of Contents

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BQ25672 Evaluation Module 1

Table 1-4. Recommended Operating Conditions.........................................................................................................................6

Table 4-1. BQ25672EVM Bill of Materials..................................................................................................................................18

Trademarks

Microsoft® and Windows® are registered trademarks of Microsoft Corporation.

All trademarks are the property of their respective owners.

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1 Introduction

The BQ25672 is an integrated switched-mode buck battery charge management device in QFN package. It

is intended to charge 1S to 4S cell Li-ion and Li-polymer batteries. The charger features a narrow voltage

DC architecture (NVDC) which allows the system to be regulated to a minimum value even if the battery is

completely discharged. With dual input source selection, OTG support, and an integrated 16-bit multi-channel

analog-to-digital converter (ADC), the BQ25672 is a complete charging solution.

1.1 EVM Features

The BQ25672EVM is a complete module for evaluating the BQ25672 charger IC in the QFN package. Key

features of this EVM include:

• Synchronous Switch Mode Buck-Boost Charger for 1S-4S Battery Configuration for 3-A Charging with 10-mA

Resolution

• Support for 6-V to 24-V Wide Range of Input Sources

• Dual Input Source Selector to Drive Bi-Directional Blocking NFETs

• Power up USB Port from Battery (USB OTG) with 5-V to 12-V OTG Output Voltage with 10-mV Resolution

• Low Battery Quiescent Current < 1 µA in Shutdown Mode

The device data sheet, listed in Table 1-1, provides detailed features and operation.

Table 1-1. Device Data Sheet

Device Data Sheet

BQ25672 SLUSEB9

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1.2 I/O Descriptions

Table 1-2 lists the BQ25672EVM board connections and ports.

Table 1-2. EVM Connections

Connector, Port Description

J1 VIN1 Positive rail of the priority input adapter or power supply

GND Ground

J2 VIN2 Positive rail of the secondary input adapter or power supply

GND Ground

J3 SYSTEM Positive rail of the charger system output voltage, typically connected to the system load

GND Ground

J4 VPMID Positive rail of the charger output voltage for reverse mode (OTG). This output also shares the rail with

VBUS in forward mode

GND Ground

J5 BATTERY Positive rail of the charger battery input

SNS_BATP Input connected to the positive terminal of the battery for remote battery voltage measurement

GND Ground

J6 USB port N/A

J7 EXTERNAL

THERMISTOR

Input connected to an external battery temperature sensing thermistor

GND Ground

J8 Communication port I2C communication port for use with the EV2300/2400 Interface Board

J9 Communication port I2C communication port for use with the USB2ANY Interface Adapter (for future use)

Table 1-3 lists the shunt installations available on the EVM, and their respective descriptions.

Table 1-3. EVM Shunt and Switch Installation

Shunt Description BQ25672 Setting

JP1 ACDRV1 pin connection to control ACFET1-RBFET1. Connect this to _acdrv1 when utilizing

the input protection MOSFETs. Connect this to GND when input protection MOSFETs are not

utilized or bypassed

ACDRV1 to _acdrv1

JP2 ACDRV2 pin connection to control ACFET2-RBFET2. Connect this to _acdrv2 when utilizing

the input protection MOSFETs. Connect this to GND when input protection MOSFETs are not

utilized or bypassed

ACDRV2 to _acdrv2

JP3 VIN1/VAC1 to VBUS bypass connection. Connect this when the input protection MOSFET

feature is not desired. This will connect the input source on VIN1 to VBUS.

Not Installed

JP4 VIN2/VAC2 to VBUS bypass connection. Connect this when the input protection MOSFET

feature is not desired. This will connect the input source on VIN2 to VBUS.

Not Installed

JP5 BAT to BATTERY bypass connection. Connect this when the ship and shutdown mode

features are not desired.

Not Installed

JP6 N/A Installed

JP7 USB port J6 positive rail to charger VBUS selection. Use shunt to select either VIN1/VAC1 or

VIN2/VAC2 as the connection for the USB port.

USB_VIN to VAC1

JP8 SDRV pin connection to control SFET. Disconnect when ship and shutdown mode features are

not desired.

Not Installed

JP9 BATP pin connection. BATP is always connected to J5 pin 2 for remote battery sense. If

remote sense is not used, short pin 1 to J5 pin 1 (BATTERY) for the charger constant voltage

sensing to occur at the connector pin or short pin 2 to pin 3 (BAT pin) for the charger constant

voltage sensing to occur on the PCB board. Do not leave BATP pin floating.

Short pin 1 to J5 pin 1

(BATTERY)

JP10 Do not remove Installed

JP11 N/A Installed

JP12 REGN to TS resistor divider network connection. This must remain connected. Installed

JP13 ILIM_HIZ pin setting for 500 mA. Connect to set the external input current limit setting to

500mA

Not Installed

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Table 1-3. EVM Shunt and Switch Installation (continued)

Shunt Description BQ25672 Setting

JP14 ILIM_HIZ pin setting for 1.5 A. Connect to set the external input current limit setting to 500mA Installed

JP15 Thermistor COOL temperature setting. Connect jumper to simulate charger entering TCOOL

(T1-T2) temperature region.

Not Installed

JP16 Thermistor COLD temperature setting. Connect jumper to simulate charger entering TCOLD

(<T1) temperature region.

Not Installed

JP17 CE pin connection to ground to enable charging. When removed, CE pin will pull up to disable

charge

Installed

JP18 Thermistor NORMAL temperature setting. Connect jumper to simulate charger entering

TNORMAL (T2-T3) temperature region. Keep connected when testing other termistor

temperature settings (JP17 - TCOOL, JP18 - TCOLD, JP21 - TWARM, JP22 - THOT).

Remove this jumper whenever using an externally connected thermistor.

Installed

JP19 Thermistor WARM temperature setting. Connect jumper to simulate charger entering TWARM

(T3-T5) temperature region.

Not Installed

JP20 Thermistor HOT temperature setting. Connect jumper to simulate charger entering THOT

(>T5) temperature region.

Not Installed

JP21 ILIM_HIZ pin setting for HIZ mode. Connect to enter the charger high impedance (HIZ) mode

to disable the converter

Not Installed

JP22 PROG pin setting for 1S, 1.5 MHz. Connect to configure charger default setting to 1S charge

regulation voltage, 2 A charging current, and 1.5 MHz switching frequency

Not Installed

JP23 PROG pin setting for 1S, 750 kHz. Connect to configure charger default setting to 1S charge

regulation voltage, 2 A charging current, and 750 kHz switching frequency

Not Installed

JP24 PROG pin setting for 2S, 1.5 MHz. Connect to configure charger default setting to 2S charge

regulation voltage, 2 A charging current, and 1.5 MHz switching frequency

Installed

JP25 PROG pin setting for 2S, 750 kHz. Connect to configure charger default setting to 2S charge

regulation voltage, 2 A charging current, and 750 kHz switching frequency

Not Installed

JP26 PROG pin setting for 3S, 1.5 MHz. Connect to configure charger default setting to 3S charge

regulation voltage, 1 A charging current, and 1.5 MHz switching frequency

Not Installed

JP27 PROG pin setting for 3S, 750 kHz. Connect to configure charger default setting to 3S charge

regulation voltage, 1 A charging current, and 750 kHz switching frequency

Not Installed

JP28 PROG pin setting for 4S, 1.5 MHz. Connect to configure charger default setting to 4S charge

regulation voltage, 1 A charging current, and 1.5 MHz switching frequencyv

Not Installed

JP29 PROG pin setting for 4S, 750 kHz. Connect to configure charger default setting to 4S charge

regulation voltage, 1 A charging current, and 750 kHz switching frequency

Not Installed

JP30 Input connection for onboard PULLUP rail LDO. Connect to power onboard 3.3V pullup rail.

LDO input will be connected via diode-OR between VBUS and BAT

Installed

JP31 EV2400 internal pullup to PULLUP connection. Connect to use EV2400 internal 3.3 V pullup to

drive the EVM PULLUP rail 1

Not Installed

JP32 STAT pin LED indicator connection. This indicates the current charger Status Installed

JP33 USB2ANY internal pullup to PULLUP connection. Connect to use the USB2ANY internal 3.3 V

pullup to drive the EVM PULLUP rail

Not Installed

S1 QON control switch. Press to either exit Ship Mode or reset the System Power Default Off

1EV2400 internal 3.3V pullup rail is not active by default. Requires modification to the internal circuit of the EV2400.

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1.3 Recommended Operating Conditions

Table 1-4. Recommended Operating Conditions

Description MIN TYP MAX Unit

V(VINx) at J1 or J2 Power supply voltage to the external blocking FETs

which allow power to VBUS pin 6 24 V

I(INx) into J1 or J2 Power supply current, which can be limited by charger's

input current limit feature (IINDPM) 0.01 3.3 A

V(BATTERY) voltage at J5 Battery voltage supported for pre charge 2.2 3.8(1S), 7.6(2S),

11.4(3S), 15.2V(4S) 18.8 V

I(BATTERY) out of/into J5 Battery charge current 0.01 2 (1S, 2S), 1(3S, 4S) 3 A

V(SYS) at J3 System voltage regulation range 3.2 19 V

I(SYS) out of J3 System load current 0 5 A

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2 Test Setup and Results

2.1 Equipment

This section includes a list of supplies required to perform tests on the BQ25672EVM.

•Power Supplies for VBUS pin: Power Supply #1 (PS1): A power supply capable of supplying up to 24 V at

3 A is required.

•Battery Simulator for BAT pin: Load #1 (4-Quadrant Supply): A Kepco Load, BOP, 20-5M, DC 0 to ±20 V,

0 to ±6 A (or higher) or a Keithley 2450 3-A source meter. When using both, a 1000-µF or higher, low ESR,

25-V rated or higher connected at the EVM battery and ground terminals is recommended.

Alternative Option: A 0–20 V/0–5 A, > 60-W DC electronic load set in a constant voltage loading mode in

parallel with a second power supply can be used. The second power supply is set to a voltage slightly below

the electronic load's constant voltage setting. When enabled, the charger's charge current then replaces the

current provided the second power supply.

•System load simulator for SYS pin:Load #2( Electronic load set to constant resistance or Resistive Load):

10 Ω, 5 W (or higher)

•Meters: (6x) "Fluke 75" multimeters, (equivalent or better).

Alternative Option: (4x) equivalent voltage meters and (2x) equivalent current meters. The current meters

must be capable of measuring at least 5 A. If used in series between the PS#1, Load#1 or Load#2, the

meters should be set for manual not auto ranging. Current meters add significant series resistance which

affects charger performance.

•Computer: A computer with at least one USB port and a USB cable. A valid internet connection is required

when using the GUI Composer application.

•PC Communication Interface:EV2300/2400 USB-Based PC Interface Board (when using Battery

Management Studio) or USB2ANY interface adapter (when using TI Charger GUI).

2.2 Equipment Setup

Use the following list to set up the EVM testing equipment. Refer to Figure 2-1 for the test setup connections to

the EVM:

1. Review the EVM connections in Table 1-2.

2. Set PS#1 for 5.0-V, 3-A current limit and then turn off the supply. Connect PS#1 to J1 (VIN1 and PGND).

3. Connect a voltage meter across TP23 (VBUS) and TP44 (PGND) to measure the input voltage as seen from

the VBUS pins of the charger.

4. Connect a voltage meter across TP1 and TP2 (I_VAC1_SENSE) to measure the input current into the VBUS

pins through the VIN1 path. Alternatively, you may connect a current meter between PS1 and J1.

5. Set Load #1 to constant voltage mode, capable of sinking (for example, compliance) at least 3 A, and output

to 5.0 V, and then disable load. Connect Load #1 to J5 (BATTERY and PGND).

6. Connect a voltage meter across TP29 (BAT) and TP46 (PGND) to measure the battery voltage as seen from

the BAT pins of the charger.

7. Connect a voltage meter across TP19 and TP20 (I_BAT_SENSE) to measure the battery charge current out

of and discharge current into BAT pins. Alternatively, you may connect a current meter between Load #1 and

J5.

8. Connect a voltage meter across TP28 (SYS) and TP45 (PGND) to measure the system voltage as seen

from the SYS pins of the charger.

9. Install shunts as shown in Table 1-3.

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Power Supply #1

Load #1:

Battery

Simulator

VVV

EV2300/2400

USB

VVV

4-pin Connector

VPMID VVBUS

VSYS

VBAT

VVV

IVAC1

±

VVV

Optional Load #2:

eLoad or

resistor

USB2ANY

USB

10-pin

Connector

IBAT

Figure 2-1. Equipment Test Setup for Testing Battery Charging

2.3 Software Setup

2.3.1 BQSTUDIO using EV2400

Download the latest version of BQSTUDIOTEST. Double click the Battery Management Studio installation file

and follow the installation steps. The software supports Microsoft® Windows® XP, 7, and 10 operating systems.

Launch BQSTUDIO and select Charger. If the EVM configuration file for BQSTUDIO does not appear in the

Charger, close BQSTUDIO and either download the .BQZ file from the EVM product folder at www.ti.com or

request the file via e2e.ti.com. The file must be saved into C:\XXX\BatteryManagementStudio\config, where XXX

is the directory you selected to install BQSTUDIO.

2.3.2 TI Charger GUI for USB2ANY

Navigate to the TI-CHARGER-GUI tool folder. Once at the tool page click on the "Start Evaluation" button. The

browser will automatically be redirected to the TI Charger GUI landing page. From the landing page locate the

device desired for evaluation and click "Select Device." Please note that the EVM must be powered and the

USB2ANY must be connected to both the EVM and the PC for a connection be established.

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2.4 Test Procedure

2.4.1 Initial Settings

Use the following steps to enable the EVM test setup:

1. Make sure Equipment Setup steps have been followed.

2. Remove the shunt on JP17 to disable charge.

3. Launch the TI-CHARGER-GUI software and select the BQ25672, if not already done.

4. Turn on PS1 and Load #1:

•Measure ➡ VSYS-PGND (TP28 and TP45) = 8.55 V ±0.2 V

2.4.2 Communication Verification

Use the following steps for communications verification:

1. In the TI Charger GUI, select the device to be evaluated, once directed, the software will be directed to

Home page. The connection status should display as Connected.

Note

If the device is not communicating and does not connect, verify that Section 2.2 and Section

2.4.1 steps have been followed. Verify the voltage across TP41 (PULLUP) and TP49 (AGND) is

approximately 3.3 V.

2. Select Menu in the top left of the screen. Note the names of the pages and the associated icons.

3. Prepare the charge mode charger register settings in the following way if not already set there by default:

• On the Quick Start page below the Quick Start section

– Set Watchdog Timer to "Disabled"

– Set Charge Current to "0.500 A"

– Set Charge Voltage to "8.400 V"

• On the Charger Configuration page below the Charging Configuration section

– Set Precharge current to "0.240 A"

– Set VSYSMIN to "7.000 V"

• On the Charger Configuration page below the Input Configuration section

– Set IINDPM to "3.000 A"

– Set ABS VINDPM to "6.000 V"

• On the Chip Configuration page below the Chip Configuration section

– Check the ShipFET Present? box

2.4.3 Charge Mode Verification

Use the following steps for charge mode verification, including pre-charge, CC and CV phases for boost

operation:

1. PS1 and Load #1 should be on from Initial Settings. In the EVM GUI, it is generally recommended to read

READ ALL REGISTERS one time in order to show all the interrupts (from status changes, automated routine

completion, faults) that occurred since the last read. Reading those registers a second clears the interrupts.

After reading the registers,

•Verify ➡ the Status and Faults page reports all Normal, meaning no DPM loops active and no WD timer

fault, VAC1 Present, VBUS Present and Power Good

2. Reinstall the shunt on jumper J17 to enable charge

•Verify ➡ STAT LED (D13) is lit

3. Take measurements as follows, noting that you may have to adjust the output of the load to accommodate

for voltage drop across the leads from the load to the EVM:

•Measure ➡ VVBUS-PGND (TP23 and TP44) = 12.0 V ±0.2 V

•Measure ➡ VBAT-PGND (TP29 and TP46) = 5.0 V ±0.2 V

•Measure ➡ IBAT_SENSE (voltage across 0.01 ohm resistor between TP19 and TP20) = 240 mA ±60 mA

•Click READ ALL REGISTERS and Verify ➡ Charge Status reports Precharge

4. Increase Load #1 regulation voltage to 8.0 V and take measurements as follows, noting that you may have

to adjust the output of the load to accommodate for voltage drop across the leads from the load to the EVM:

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•Measure ➡ VVBUS-PGND (TP23 and TP44) = 12.0 V ±0.2 V

•Measure ➡ VBAT-PGND (TP29 and TP46) = 8.0 V ±0.1 V

•Measure ➡ IBAT_SENSE (voltage across 0.01-Ω resistor between TP19 and TP20) = 500 mA ±50 mA

•Measure ➡ IVAC1_SENSE (voltage across 0.01-Ω resistor between TP1 and TP2) = 900 mA ±60 mA

•Click READ ALL REGISTERS and Verify ➡ Charge Status reports fast charge

5. Increase Load #1 regulation voltage to 8.4 V and take measurements as follows:

•Measure ➡ VBAT-PGND (TP29 and TP46) = 8.4 V ±0.04 V

•Measure ➡ IBAT_SENSE (voltage across 0.01-Ω resistor between TP19 and TP20) = 0 mA ±10 mA

•Click READ ALL REGISTERS and Verify ➡ Charge Status reports termination

6. Helpful hints when changing voltages and register settings from those above during charge mode:

• If increasing charge current or adding a load at SYS J3 terminal, you will likely need to disable the

EN_ILIM bit using the Charger Configuration page and increase the IINDPM register setting in the

Charger Configuration page.

• If increasing the input voltage above 8 V for the charger to enter buck mode, you will need to increase the

VAC_OVP from 7 V default using Charger Configuration page.

• The battery configuration is set at startup using the PROG pin (Jumpers JP24 to JP31). The battery

configuration can also be changed using the Quick Start page. Note that the SYSMIN and charge current

charge with cell configuration.

• The status, fault and interrupt bits report are helpful debug tools.

2.4.4 OTG Mode Verification

Use the following steps for OTG mode verification for boost operation:

1. Power up then turn off Load#2 output. Set to CR = 12 V/0.5 A = 24 Ω. Disconnect PS1 from J1 and attach

Load#2 to J1 (VIN1 and GND).

2. Increase Load #1 regulation voltage to 8.0 V and take measurements as follows:

•Measure ➡ VBAT-PGND (TP29 and TP46) = 8.0 V ±0.1 V

3. Prepare the OTG mode charger register settings in the following way:

• In the Chip Configuration page below the Chip Configuration section

– Uncheck "EN Charge" to disable charge mode

– Check "EN OTG Mode" to enable OTG mode

– Check "EN ADRV1" to enable ACDR1 FETs

• In the OTG Configuration page below the OTG Configuration section

– Set the OTG Reg Voltage to 12.000 mV.

– Set the IOTG Limit to 1.000 A

4. Take measurements as follows:

•Measure ➡ VVBUS-PGND (TP23 and TP44) = 12.0 V ±0.2 V

•Measure ➡ VAC1-PGND (TP24 and TP44) = 12.0 V ±0.2 V. Note that the PCB silk screen for VAC1 and

VAC2 are reversed.

•Click READ ALL REGISTERS

–Verify ➡ REG1Bb[6] reports VINDPM or OTG

–Verify ➡ REG1Cb[4:1] reports VBUS Status as Normal OTG

5. Turn on Load#2 output set to constant resistance (CR) of 24 Ω.

6. Take measurements as follows:

•Measure ➡ VAC1-PGND (TP23 and TP44) = 12.0 V ±0.2 V

•Measure ➡ IAC1-SENSE (TP1 and TP2) = 500 mA ±0.10 A

7. Lower the Load#2 to constant resistance (CR) to 10 Ω.

8. Take measurements as follows to confirm OTG current limit function:

•Measure ➡ VAC1-PGND (TP23 and TP44) < 12.0 V ±0.2 V

•Measure ➡ IAC1-SENSE (TP1 and TP2) = 1000 mA ±0.10 A

•Click READ ALL REGISTERS and Verify ➡ REG1Bb[7] reports IINDPM

9. Hints for further OTG testing:

• Enabling OTG mode is a two-step process, first enable OTG and then turn on the appropriate AC drive

FETs.

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