Texas Instruments BQ25887, User Manual

Page 1: ...ide the abbreviations EVM BQ25887EVM BMS016 and the term evaluation module are synonymous with the BQ25887 QFN evaluation module unless otherwise noted Contents 1 Introduction 2 1 1 EVM Features 2 1 2 I O Descriptions 2 2 Test Summary 4 2 1 Equipment 4 2 2 Charge Mode 5 2 3 Helpful Tips 8 3 PCB Layout Guidelines 8 4 Board Layout Schematic and Bill of Materials 9 4 1 Board Layout 9 4 2 Schematic 10...

Page 2: ...t adapter for connecting to a USB source and either using the PSEL pin header to set the default input current limit Use the EV2400 interface to program parameters for charge operation as well as monitor voltages and current with an integrated analog to digital converter ADC Cell balancing feature with resistor programmable current setting Onboard test points sense resistors and jumpers facilitate...

Page 3: ...oard 10 kΩ from TS pin to GND Installed JP8 DNI NA JP9 Connects CD to GND NA JP10 Pulls up STAT through diode and resistor to pullup source Installed JP11 Pulls up PG through diode and resistor to pullup source Shunt pins 2 and 3 JP12 Pull up SDA through 10 kΩ resistor optional if I2C line has internal pullup Shunt pins 2 and 1 JP13 Pull up SCL through 10 kΩ resistor optional if I2C line has inter...

Page 4: ...or higher and Keithley 2420 Sourcemeter 3 Load 1 Electronic or resistive load capable of sinking up to 3 A at 9 2 V 4 Meters Six Fluke 75 multimeters equivalent or better Alternatively four equivalent voltage meters and two equivalent current meters The current meters must be capable of measuring greater than 3 A of current A current meter in series with the battery or battery simulator must have ...

Page 5: ...BQ25887 Charge Mode Test Setup 2 Voltmeters 1 through 3 VM1 VM2 and VM3 connect to Kelvin test points for measuring VBUS SYS and BAT as close to the IC pins as possible Voltmeters 4 through 6 measure the voltage across 0 01 Ω which gives the current 3 Before attaching to the EVM set battery simulator 1 BS 1 and battery simulator 2 BS 2 no higher than 3 8V and at a 2 5 A current limit and set power...

Page 6: ...rt charging at 1 0 A To correct for cable resistance adjust PS 1 until VM1 TP7 VBUS_S TP26 AGND measures 5 5 V 50 mV and adjust BS1 until VM3 TP15 BAT TP12 MID measures 3 8 V 50 mV and BS2 until VM4 TP12 MID TP26 AGND measures 3 8 V 50 mV Measure on VM6 V TP5 RBAT TP6 RBAT 10 mV 0 7 mV which corresponds to ICHG 1 0 A 5 through a 0 010 Ω 1 resistor Voltage of 0 1 mV is added to account for DMM accu...

Page 7: ...ion Feedback Copyright 2019 Texas Instruments Incorporated BQ25887 QFN boost mode battery charger with cell balancing evaluation module Advance Information 2 2 4 Charge Mode Evaluation Results Figure 2 shows the Charge Mode Startup graph Figure 2 Charge Mode Startup ...

Page 8: ...n series between the power sources and power pins 3 PCB Layout Guidelines Minimize the switching node rise and fall times for minimum switching loss Proper layout of the components that minimize the high frequency current path loop is important to prevent electrical and magnetic field radiation and high frequency resonant problems To ensure proper layout follow the priority list for this printed c...

Page 9: ...corporated BQ25887 QFN boost mode battery charger with cell balancing evaluation module Advance Information 4 Board Layout Schematic and Bill of Materials 4 1 Board Layout Figure 3 through Figure 6 show the PCB board layouts Figure 3 BQ2588xEVM Top Overlay Figure 4 BQ2588xEVM Layer 2 Figure 5 BQ2588xEVM Layer 3 Figure 6 BQ2588xEVM Bottom Overlay ...

Page 10: ...SW SW 15 16 13 14 BTST REGN 25 PG PSEL BQ25887RGER U1 STAT TS ILIM CD_ CE SDA_GND SCL_OTG D _PSEL D _ PG INT_VSET SW SW 10 0k R9 GND 1uH L1 22uF C5 22uF C12 10uF C6 IBUS up to 3A VSYS up to 8 6V VBAT up to 8 4V VBUS VBUS_IC PMID 1uH L2 JP9 CD_ CE GND 10k ohm R19 NT1 Net Tie 1uF C15 20V D6 20V D7 JP14 JP15 0 01 R2 0 01 R6 2 2uF C17 1uF C16 TLV70433DBVT GND 3 IN NC 5 U2 SNS_SYS CD_ CE 82 R20 82 R21 ...

Page 11: ...16 Any C1 1 0 01uF CAP CERM 0 01 uF 25 V 10 X7R 0402 0402 GCM155R71E103 KA37D MuRata C3 C4 2 22uF CAP CERM 22 uF 25 V 20 X5R 0805 0805 GRM21BR61E226 ME44L MuRata C7 C11 2 10uF CAP CERM 10 uF 25 V 20 X5R 0603 0603 GRM188R61E106 MA73D MuRata C9 1 0 047uF CAP CERM 0 047 uF 25 V 10 X7R 0402 0402 GRM155R71E473 KA88D MuRata C14 1 4 7uF CAP CERM 4 7 uF 10 V 20 X5R 0402 0402 GRM155R61A475 MEAAD MuRata C15...

Page 12: ...e B R A Bottom Mount SMT 7 5x2 45x5mm 473460001 Molex JP1 JP4 JP11 JP12 4 Header 100mil 3x1 Tin TH Header 3 PIN 100mil Tin PEC03SAAN Sullins Connector Solutions JP2 JP5 JP7 JP10 JP13 JP14 JP15 7 Header 100mil 2x1 Tin TH Header 2 PIN 100mil Tin PEC02SAAN Sullins Connector Solutions L2 1 1uH Inductor Shielded Drum Core Powdered Iron 1 uH 11 A 0 009 ohm SMD IHLP 2525CZ IHLP2525CZER1R 0M01 Vishay Dale...

Page 13: ...AEC Q200 Grade 0 0402 0402 CRCW0402300RJ NED Vishay Dale SH JP1 SH JP2 SH JP3 SH JP4 SH JP5 SH JP6 SH JP7 SH JP8 SH JP9 SH JP10 SH JP11 SH JP12 SH JP13 SH JP14 SH JP15 SH JP16 16 1x2 Shunt 100mil Gold plated Black Shunt SNT 100 BK G Samtec 969102 0000 DA 3M TP1 TP2 TP5 TP6 TP9 TP10 TP12 TP13 TP16 TP17 TP18 TP19 TP20 TP21 TP22 TP28 TP29 17 Test Point Miniature White TH White Miniature Testpoint 500...

Page 14: ...2uF CAP CERM 22 uF 25 V 10 X5R 1206 1206 GRM31CR61E226 KE15L MuRata C6 0 10uF CAP CERM 10 uF 25 V 20 X5R 0603 0603 GRM188R61E106 MA73D MuRata C12 0 22uF CAP CERM 22 uF 25 V 10 X5R AEC Q200 Grade 3 1206 1206 GRT31CR61E226 KE01L MuRata C13 0 110pF CAP CERM 110 pF 25 V 5 C0G NP0 0402 0402 GRM1555C1E111J A01D MuRata D1 D3 D6 0 20V Diode Schottky 20 V 1 A 152AD 152AD NSR10F20NXT5G ON Semiconductor D2 0...

Page 15: ... 10 5 0 063 W 0402 0402 CRCW040210R0J NED Vishay Dale R19 R31 0 10k ohm Trimmer 10k ohm 0 25W TH 4 5x8x6 7mm 3266W 1 103LF Bourns R26 0 39 2k RES 39 2 k 1 0 063 W AEC Q200 Grade 0 0402 0402 CRCW040239K2F KED Vishay Dale R27 0 75 0k RES 75 0 k 1 0 063 W AEC Q200 Grade 0 0402 0402 CRCW040275K0F KED Vishay Dale R28 0 150k RES 150 k 1 0 1 W AEC Q200 Grade 0 0402 0402 ERJ 2RKF1503X Panasonic R29 0 18 0...

Page 16: ...16 SLUUC12 February 2019 Submit Documentation Feedback BQ25887 QFN boost mode battery charger with cell balancing evaluation module ...

Page 17: ... application and 3 ensuring your application meets applicable standards and any other safety security or other requirements These resources are subject to change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reproduction and display of these resources is prohibited No license is grante...

Page 18: ...other than TI b the nonconformity resulted from User s design specifications or instructions for such EVMs or improper system design or c User has not paid on time Testing and other quality control techniques are used to the extent TI deems necessary TI does not test all parameters of each EVM User s claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects...

Page 19: ... These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation...

Page 20: ...y for convenience and should be verified by User 1 Use EVMs in a shielded room or any other test facility as defined in the notification 173 issued by Ministry of Internal Affairs and Communications on March 28 2006 based on Sub section 1 1 of Article 6 of the Ministry s Rule for Enforcement of Radio Law of Japan 2 Use EVMs only after User obtains the license of Test Radio Station as provided in R...

Page 21: ... any interfaces electronic and or mechanical between the EVM and any human body are designed with suitable isolation and means to safely limit accessible leakage currents to minimize the risk of electrical shock hazard User assumes all responsibility and liability for any improper or unsafe handling or use of the EVM by User or its employees affiliates contractors or designees 4 4 User assumes all...

Page 22: ...OR DAMAGES ARE CLAIMED THE EXISTENCE OF MORE THAN ONE CLAIM SHALL NOT ENLARGE OR EXTEND THIS LIMIT 9 Return Policy Except as otherwise provided TI does not offer any refunds returns or exchanges Furthermore no return of EVM s will be accepted if the package has been opened and no return of the EVM s will be accepted if they are damaged or otherwise not in a resalable condition If User feels it has...

Page 23: ...se resources are subject to change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reproduction and display of these resources is prohibited No license is granted to any other TI intellectual property right or to any third party intellectual property right TI disclaims responsibility for...