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
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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
+
VVV
EV2300/2400
USB
VVV
+
VV
4-pin Connector
VPMID VVBUS
VSYS
VBAT
VVV
IVAC1
±
+
±
±
+
±
VVV
Optional Load #2:
eLoad or
resistor
USB2ANY
USB
OR
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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