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bq28550-r1 slusas4a ? october 2012 ? revised september 2014 bq28550-r1 single cell li-ion battery gas gauge and protection not recommended for new designs check for samples: bq28550-r1 1 1 features ? a comprehensive single-cell li-ion battery gas 3 description gauge and protection integrates all essential the texas instruments bq28550-r1 battery gas functions: gauge provides current and voltage protection, and secure, sha-1/hmac authentication for single-cell ? low-side n-ch fet protection control lithium-ion battery packs. designed for battery-pack ? jeita/enhanced charging integration, the bq28550-r1 requires host ? authentication microcontroller firmware support for implementation. a system processor communicates with the bq28550- ? records battery gas gauge information r1 using a serial interface to obtain remaining battery ? protection functions help to prevent: capacity, system run-time predictions, and other ? short-circuit critical battery information. ? overcurrent charge and discharge the bq28550-r1 gas gauge uses an accurate gas ? overvoltage charge (overcharge) gauging algorithm to report the status of the cell. the gauge provides information such as state-of-charge ? undervoltage (over-discharge) (%), run-time-to-empty (min.), charge-time to full ? firmware control of discharge fet (min.), battery voltage (v), and pack ? sha-1/hmac battery authentication temperature ( c). ? general purpose i/o configurable for one of the the bq28550-r1 gas gauge also features integrated following: support for secure battery-pack authentication, using ? cfet control the sha-1/hmac authentication algorithm. ? alert output device information (1) ? i 2 c communications interface with sbs device name package body size command set operation bq28550-r1 vson (12) 4.00 mm 2.50 mm ? 12-pin, 2.50-mm x 4.00-mm son package (1) for all available packages, see the orderable addendum at the end of the data sheet. 2 applications ? tablet pcs ? slates ? digital still and video cameras ? handheld terminals ? mp3 or multimedia players 1 an important notice at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. production data. productfolder sample &buy technical documents tools & software support &community
not recommended for new designs bq28550-r1 slusas4a ? october 2012 ? revised september 2014 www.ti.com table of contents cell voltage) characteristics ...................................... 8 1 features .................................................................. 1 6.13 electrical characteristics: data flash memory 2 applications ........................................................... 1 characteristics ........................................................... 8 3 description ............................................................. 1 6.14 electrical characteristics: serial communication 4 revision history ..................................................... 2 timing characteristics................................................ 8 5 pin configuration and functions ......................... 3 7 detailed description ............................................ 10 6 specifications ......................................................... 4 7.1 overview ................................................................. 10 6.1 absolute maximum ratings ..................................... 4 7.2 data acquisition ...................................................... 10 6.2 handling ratings ...................................................... 4 7.3 over-temperature indication .................................. 11 6.3 recommended operating conditions ....................... 4 7.4 gas gauging ........................................................... 11 6.4 thermal information .................................................. 5 7.5 protection ................................................................ 11 6.5 electrical characteristics: battery protection ............ 5 7.6 feature description ................................................. 17 6.6 electrical characteristics: voltage regulator ............ 6 8 application and implementation ........................ 30 6.7 electrical characteristics: power-on reset .............. 7 8.1 typical application .................................................. 30 6.8 electrical characteristics: internal temperature 9 device and documentation support .................. 33 sensor characteristics ............................................... 7 9.1 related documentation ........................................... 33 6.9 electrical characteristics: high frequency 9.2 trademarks ............................................................. 33 oscillator .................................................................... 7 9.3 electrostatic discharge caution .............................. 33 6.10 electrical characteristics: low frequency 9.4 glossary .................................................................. 33 oscillator .................................................................... 7 6.11 electrical characteristics: integrating adc 10 mechanical, packaging, and orderable (coulomb counter) characteristics ............................ 7 information ........................................................... 34 6.12 electrical characteristics: adc (temperature and 4 revision history note: page numbers for previous revisions may differ from page numbers in the current version. changes from original (october 2012) to revision a page ? changed the document format per updated texas instruments data sheet standards ........................................................ 1 ? deleted ordering information table ...................................................................................................................................... 1 2 submit documentation feedback copyright ? 2012 ? 2014, texas instruments incorporated product folder links: bq28550-r1
not recommended for new designs bq28550-r1 www.ti.com slusas4a ? october 2012 ? revised september 2014 5 pin configuration and functions pin functions pin number pin name i/o (1) description 1 dout ia the output of gate drive for discharge fet 2 cout ia the output of gate drive for charge fet analog input pin connected to the packn through a 510- resistor. overcurrent and short- 3 vm ia circuit protection circuits use the voltage across vm and vss to detect if excessive charge or discharge current is flowing through the protection fets. 4 bat ia cell voltage measurement input. adc input. connect a 0.1- f ceramic capacitor to vss. 2.5-v output voltage of the internal integrated ldo. connect a 0.1- f ceramic capacitor to 5 vreg p vss. 6 vss p device ground analog input pin connected to the internal coulomb counter where srp is nearest the 7 srp ia cell ? connection. connect to a 5-m ? to 20-m ? sense resistor. analog input pin connected to the internal coulomb counter where srn is nearest the 8 srn ia packn connection. connect to a 5-m ? to 20-m ? sense resistor. 9 ts ia pack thermistor voltage sense (use 103at-type thermistor), adc input 10 sda i/o serial data interface for smbus 11 scl i serial clock interface for smbus 12 gpio i/o general purpose i/o for configurable function (cfet control or alert output) 13 pwpd i/o texas instruments recommends connecting the power pad to vss on the pcb. copyright ? 2012 ? 2014, texas instruments incorporated submit documentation feedback 3 product folder links: bq28550-r1 dout 1 2 3 4 5 6 12 11 10 9 8 7 cout vm bat vreg vss srp srn ts sda scl gpio
not recommended for new designs bq28550-r1 slusas4a ? october 2012 ? revised september 2014 www.ti.com 6 specifications 6.1 absolute maximum ratings all voltages are referenced to the vss pin. over operating free-air temperature range (unless otherwise noted) (1) parameter min typ max unit v bat regulator input voltage, bat (pin 4) ? 0.3 12 v v vm vm terminal voltage (pin 3) v bat ? 32 v bat + 0.3 v v cout cout terminal input voltage (pin 2) v bat ? 32 v bat + 0.3 v v dout dout terminal input voltage (pin 1) v ss ? 0.3 v bat + 0.3 v v iod all other pins (pins 5, 7, 8, and 9) ? 0.3 6 v v sdata sda (pin 10) v ss ? 0.3 v bat + 0.3 v v sclk scl (pin 11) v ss ? 0.3 v bat + 0.3 v v gpio gpio (pin 12) ? 0.3 6 v esd human body model 2 kv esd machine model 200 v t a operating free-air temperature range ? 40 c 85 c t stg storage temperature range ? 65 c 150 c (1) stresses beyond those listed under ? absolute maximum ratings ? may cause permanent damage to the device. these are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under ? recommended operating conditions ? is not implied. exposure to absolute ? maximum ? rated conditions for extended periods may affect device reliability. 6.2 handling ratings min max unit t stg storage temperature range ? 65 150 c hbm (1) ? 2 2 kv v (esd) rating cdm (2) ? 500 500 v (1) jedec document jep155 states that 500-v hbm allows safe manufacturing with a standard esd control process. (2) jedec document jep157 states that 250-v cdm allows safe manufacturing with a standard esd control process. 6.3 recommended operating conditions t a = 25 o c, v bat = 3.6 v (unless otherwise noted) parameter test conditions min typ max unit v bat bat 2.45 3.6 5.5 v gas gauge in normal mode. i load > sleep normal operating mode 141 current gas gauge in sleep mode. i load < sleep low-power (sleep) 70 current i cc gas gauge in fullsleep mode. i load < sleep a sleep (full sleep) 31 current gas gauge in hibernate mode. i load < hibernate 16 hibernate current shutdown gas gauge in shutdown mode 1 i ss maximum current 20 ma regulator output c reg 0.1 f capacitor v bat input filter c bat 0.1 f capacitor resistor from vm to r packn 510 packn scl, sda or gpio pull r pu_ 3.3 k up resistor scl, sda or gpio pull v pu_ 1.8 4.2 v up voltage 4 submit documentation feedback copyright ? 2012 ? 2014, texas instruments incorporated product folder links: bq28550-r1
not recommended for new designs bq28550-r1 www.ti.com slusas4a ? october 2012 ? revised september 2014 recommended operating conditions (continued) t a = 25 o c, v bat = 3.6 v (unless otherwise noted) parameter test conditions min typ max unit gpio, sda and scl v il_ ? 0.3 0.6 v input voltage low gpio, sda and scl v ih_ 1.2 6 v input voltage high gpio, sda output v ol_ i oh = 3 ma (open drain) 0 0.4 v voltage low capacitance for each c i sda and scl input capacitance 10 pf i/o pin power up t pucd 250 ms communication delay input voltage range v ai2 v ss ? 0.25 0.25 v (srp, srn) 6.4 thermal information bq28550-r1 thermal metric (1) son unit 12 pins r ja junction-to-ambient thermal resistance (2) 186.4 r jc(top) junction-to-case(top) thermal resistance (3) 90.4 r jb junction-to-board thermal resistance (4) 110.7 c/w jt junction-to-top characterization parameter (5) 96.7 jb junction-to-board characterization parameter (6) 90 r jc(bottom) junction-to-case(bottom) thermal resistance (7) n/a (1) for more information about traditional and new thermal metrics, see the ic package thermal metrics application report, spra953 . (2) the junction-to-ambient thermal resistance under natural convection is obtained in a simulation on a jedec-standard, high-k board, as specified in jesd51-7, in an environment described in jesd51-2a. (3) the junction-to-case (top) thermal resistance is obtained by simulating a cold plate test on the package top. no specific jedec- standard test exists, but a close description can be found in the ansi semi standard g30-88. (4) the junction-to-board thermal resistance is obtained by simulating in an environment with a ring cold plate fixture to control the pcb temperature, as described in jesd51-8. (5) the junction-to-top characterization parameter, jt , estimates the junction temperature of a device in a real system and is extracted from the simulation data for obtaining r ja , using a procedure described in jesd51-2a (sections 6 and 7). (6) the junction-to-board characterization parameter, jb , estimates the junction temperature of a device in a real system and is extracted from the simulation data for obtaining r ja , using a procedure described in jesd51-2a (sections 6 and 7). (7) the junction-to-case (bottom) thermal resistance is obtained by simulating a cold plate test on the exposed (power) pad. no specific jedec standard test exists, but a close description can be found in the ansi semi standard g30-88. spacer 6.5 electrical characteristics: battery protection t a = ? 40 to +85 o c, v bat =1.5 v to 5.5 v; typical values stated, where t a = 25 o c and v bat =3.6 v (unless otherwise noted) parameter test conditions min typ max unit minimum operating v st v st = v bat ? vm 1.2 v voltage for 0 v charging overcurrent release r short v bat = 4.0 v, vm = 1 v 30 50 100 k resistance ds pin pull-down r ds v bat = 4.0 v 6.5 13.0 26.0 k resistance cout low level output v ol1 voltage (referenced to i ol = 30 a, v bat = 4.5 v 0.4 0.5 v vm) cout high level output v oh1 voltage (referenced to i oh = 30 a, v bat = 4.0 v 3.4 3.7 v vm) copyright ? 2012 ? 2014, texas instruments incorporated submit documentation feedback 5 product folder links: bq28550-r1
not recommended for new designs bq28550-r1 slusas4a ? october 2012 ? revised september 2014 www.ti.com electrical characteristics: battery protection (continued) t a = ? 40 to +85 o c, v bat =1.5 v to 5.5 v; typical values stated, where t a = 25 o c and v bat =3.6 v (unless otherwise noted) parameter test conditions min typ max unit dout low level output v ol2 voltage (referenced to i ol = 30 a, v bat = 2.0 v 0.2 0.5 v vss) dout high level output v oh2 voltage (referenced to i oh = 30 a, v bat = 4.0 v 3.4 3.7 v vss) t a = 25 c detection voltage 4.230 4.250 4.270 v det1 overcharge detection t a = ? 10 to 60 c 4.225 4.250 4.275 v t a = ? 40 to 85 c 4.200 4.250 4.300 t a = 25 c 4.040 4.070 4.100 overcharge release v rel1 t a = ? 10 to 60 c 4.025 4.070 4.115 v voltage t a = ? 40 to 85 c 4.010 4.070 4.130 overcharge detection t det1 v bat = 3.5 v 4.5 v 0.60 1.00 1.50 s delay time overcharge release t rel1 v bat = 4.5 v 3.5 v 4.8 8.0 12.0 ms delay time ta = 25 c 2.265 2.300 2.335 over-discharge detection v det2 ta = ? 10 to 60 c 2.242 2.300 2.358 v voltage ta = ? 40 to 85 c 2.220 2.300 2.380 over-discharge detection t det2 v bat = 3.5 v 2.00 v 14.4 24.0 36.0 ms delay time over-discharge release v bat = 3 v t rel2 2.4 4.0 6.0 ms delay time v_ = 3 v 0 v overcurrent detection v det3 v bat = 4 v 0.130 0.150 0.170 v voltage on discharge overcurrent detection v det4 v bat = 4 v ? 0.137 ? 0.112 ? 0.087 v voltage on charging overcurrent detection v bat = 3 v t ocd 7.2 12.0 18.0 ms delay time v_ = 0 v 1 v overcurrent release v bat = 3 v t ocr 2.4 4.0 6.0 ms delay time v_ = 3 v 0 v v short short detection voltage v bat = 4 v, r packn = 510 v bat ? 1.2 v bat ? 0.9 v bat ? 0.6 v short detection delay v bat = 3 v t short 200 400 800 s time v_ = 0v 3 v 6.6 electrical characteristics: voltage regulator t a = ? 40 to +85 o c, v bat =1.5 v to 5.5 v; typical values stated, where t a = 25 o c and v bat =3.6 v (unless otherwise noted) parameter test conditions min typ max unit 2.7 v < v bat < 5.5 v, i out = 16 ma 2.45 2.50 2.55 v v reg output voltage 2.45 v < v bat < 2.7 v, i out = 3 ma 2.40 v line line regulation 2.7 v < v bat < 5.5 v, i out = 16 ma 100 200 mv v reg = 2.45 v, 100 a < i out < 3 ma 30 50 v load load regulation mv v bat = 2.7 v, 3 ma < i out < 16 ma 30 50 v bat = 2.45 v, i out = 3 ma 30 50 vdo dropout voltage mv v bat = 2.7 v, i out = 16 ma 224 290 output voltage v reg / t v bat = 3.5 v, i out = 100 a 100 ppm/ c temperature coefficient v bat = 3.5 v, i reg = 2.0 v 16 130 v line current limit ma v bat = 3.5 v, i reg = 0 v 10 35 60 v off regulator off voltage 7.0 8.0 9.0 v 6 submit documentation feedback copyright ? 2012 ? 2014, texas instruments incorporated product folder links: bq28550-r1
not recommended for new designs bq28550-r1 www.ti.com slusas4a ? october 2012 ? revised september 2014 electrical characteristics: voltage regulator (continued) t a = ? 40 to +85 o c, v bat =1.5 v to 5.5 v; typical values stated, where t a = 25 o c and v bat =3.6 v (unless otherwise noted) parameter test conditions min typ max unit v bat = 3.6 v 5.5 v, r load = 100 regulator off voltage t voff v reg = 2.5 v 2.3 v, c load = 0.1 f, 50 100 s delay time t a = 25 c 6.7 electrical characteristics: power-on reset t a = ? 40 to +85 o c; typical values at t a = 25 o c (unless otherwise noted) parameter test conditions min typ max unit positive-going battery v it+ no external loading on v reg 2.125 2.200 2.275 v voltage input at v reg v hys no external loading on v reg 75 125 175 mv 6.8 electrical characteristics: internal temperature sensor characteristics t a = ? 40 to +85 o c; v bat = 2.7 v to 5.5 v; typical values stated, where t a = 25 o c and v bat = 3.6 v (unless otherwise noted) parameter test conditions min typ max unit temperature sensor g temp ? 2 mv/ c voltage gain 6.9 electrical characteristics: high frequency oscillator t a = ? 40 to +85 o c, v bat = 2.7 v to 5.5 v; typical values stated, where t a = 25 o c and v bat = 3.6 v (unless otherwise noted) parameter test conditions min typ max unit f (osc) operating frequency 2.097 mhz t a = 0 c to 60 c ? 2.0% 0.38% 2.0% f (eio) frequency error (1) , (2) t a = ? 20 c to 70 c ? 3.0% 0.38% 3.0% t a = ? 40 c to 85 c ? 4.5% 0.38% 4.5% t (sxo) start-up time (3) 2.5 5 ms (1) the frequency error is measured from 2.097 mhz. (2) the frequency drift is included and measured from the trimmed frequency at v cc = 2.5 v, t a = 25 c. (3) the startup time is defined as the time it takes for the oscillator output frequency to be 3%. 6.10 electrical characteristics: low frequency oscillator t a = ? 40 to +85 o c, v bat = 2.7 v to 5.5 v; typical values stated, where t a = 25 o c and v bat = 3.6 v (unless otherwise noted) parameter test conditions min typ max unit f (losc) operating frequency 32.768 khz t a = 0 c to 60 c ? 1.5% 0.25% 1.5% f (leio) frequency error (1) , (2) t a = ? 20 c to 70 c ? 2.5% 0.25% 2.5% t a = ? 40 c to 85 c ? 4.0% 0.25% 4.0% t (lsxo) start-up time (3) 500 s (1) the frequency drift is included and measured from the trimmed frequency at v cc = 2.5 v, t a = 25 c. (2) the frequency error is measured from 32.768 khz. (3) the startup time is defined as the time it takes for the oscillator output frequency to be 3%. 6.11 electrical characteristics: integrating adc (coulomb counter) characteristics t a = ? 40 to +85 o c, v bat = 2.7 v to 5.5 v; typical values stated, where t a = 25 o c and v bat = 3.6 v (unless otherwise noted) parameter test conditions min typ max unit input voltage range, v in(sr) vsr = v (srn) ? v (srp) ? 0.125 0.125 v v (srn) and v (srp) conversion time single conversion 1 s t conv(sr) resolution 14 15 bits copyright ? 2012 ? 2014, texas instruments incorporated submit documentation feedback 7 product folder links: bq28550-r1
not recommended for new designs bq28550-r1 slusas4a ? october 2012 ? revised september 2014 www.ti.com electrical characteristics: integrating adc (coulomb counter) characteristics (continued) t a = ? 40 to +85 o c, v bat = 2.7 v to 5.5 v; typical values stated, where t a = 25 o c and v bat = 3.6 v (unless otherwise noted) parameter test conditions min typ max unit v os(sr) input offset 10 v inl integral nonlinearity error 0.007 0.034 fsr (1) effective input z in(sr) 2.5 m ? resistance (2) i lkg(sr) input leakage current (2) 0.3 a (1) full-scale reference (2) specified by design. not production tested. 6.12 electrical characteristics: adc (temperature and cell voltage) characteristics t a = ? 40 to +85 o c, v bat = 2.7 v to 5.5 v; typical values stated, where t a = 25 o c and v bat = 3.6 v (unless otherwise noted) parameter test conditions min typ max unit v in(adc) input voltage range ? 0.2 1 v conversion time 125 ms t conv(adc) resolution 14 15 bits v os(adc) input offset 1 mv effective input z (adc1) 8 m ? resistance (ts) (1) bq28550-r1 is not measuring cell voltage. 8 m ? effective input z (adc2) resistance (bat) (1) bq28550-r1 is measuring cell voltage. 100 k ? i lkg(adc) input leakage current (1) 0.3 a (1) specified by design. not production tested. 6.13 electrical characteristics: data flash memory characteristics t a = ? 40 to +85 o c, v bat = 2.7 v to 5.5 v; typical values stated, where t a = 25 o c and v bat = 3.6 v (unless otherwise noted) parameter test conditions min typ max unit data retention (1) 10 years t dr flash programming 20,000 cycles write-cycles (1) word programming time t wordprog 2 ms (1) flash-write supply i ccprog 5 10 ma current (1) (1) specified by design. not production tested. 6.14 electrical characteristics: serial communication timing characteristics t a = ? 40 to +85 o c, v bat = 2.7 v to 5.5 v; typical values stated, where t a = 25 o c and v bat = 3.6 v (unless otherwise noted). capacitance on serial interface pins scl and sda are 10 pf unless otherwise specified (1) . parameter test conditions min typ max unit t r scl/sda rise time 300 ns t f scl/sda fall time 300 ns t w(h) scl pulse width (high) 600 ns t w(l) scl pulse width (low) 1.3 s t su(sta) setup for repeated start 600 ns start to first falling edge t d(sta) 600 ns of scl t su(dat) data setup time 1 s t h(dat) data hold time 0 ns (1) parameters assured by worst case test program execution in fast mode. 8 submit documentation feedback copyright ? 2012 ? 2014, texas instruments incorporated product folder links: bq28550-r1
not recommended for new designs bq28550-r1 www.ti.com slusas4a ? october 2012 ? revised september 2014 electrical characteristics: serial communication timing characteristics (continued) t a = ? 40 to +85 o c, v bat = 2.7 v to 5.5 v; typical values stated, where t a = 25 o c and v bat = 3.6 v (unless otherwise noted). capacitance on serial interface pins scl and sda are 10 pf unless otherwise specified (1) . parameter test conditions min typ max unit t su(stop) setup time for stop 600 ns bus free time between t (buf) 1.3 s stop and start f (scl) clock frequency 100 khz figure 1. timing copyright ? 2012 ? 2014, texas instruments incorporated submit documentation feedback 9 product folder links: bq28550-r1 sclsda t su (sta) t d (sta) t r t su (dat) t h (dat) t w (h) t w ( l) t f t f t r t (buf) t su (stop) repeated start stop start
not recommended for new designs bq28550-r1 slusas4a ? october 2012 ? revised september 2014 www.ti.com 7 detailed description 7.1 overview the bq28550-r1 gas gauge accurately predicts the battery capacity and other operational characteristics of a single li-ion based rechargeable cell, while it also provides a state-of-the-art protection function against short circuit, overcurrent, and overvoltage. it can be integrated by a system processor to provide cell information, such as state-of-charge (soc), remaining capacity, and full charge capacity (fcc). note formatting conventions in this document: commands : italics with parentheses and no breaking spaces; for example, remainingcapacity() data flash : italics, bold, and breaking spaces; for example, design capacity register bits and flags : brackets only; for example, [tda] data flash bits : italic and bold; for example, [nr] modes and states : all capitals; for example, sealed mode 7.2 data acquisition 7.2.1 cell voltage the bq28550-r1 gas gauge samples the single cell voltage from the bat input terminal. the cell voltage is sampled and updated every 1 s in normal mode. the vss ground connection of the bq28550-r1 gas gauge should be connected to the negative terminal of the sense resistor. this will prevent any error in short circuit and overcurrent measurements across the external chg and dsg fets. 7.2.2 charge measurement the device samples the charge into and out of the single cell using a low value sense resistor. the resistor (typically 5 m ? to 20 m ? ) is connected between srp and srn to form a differential input to an integrating adc (coulomb counter). charge activity is detected when v sr = v (srp) ? v (srn) is positive, and discharge activity is detected when v sr = v (srp) ? v (srn) is negative. this data is integrated over a period of time, using an internal counter, and updates remaining capacity with charge and discharge amount every 1 s in normal mode. 7.2.3 current measurement the device has a fifo buffer, which uses the last four coulomb counter readings to calculate the current. the current is updated every 1 s in normal mode. 7.2.4 temperature measurement and the ts input the bq28550-r1 gas gauge measures external temperature via the ts pin in order to supply battery temperature status information to the gas gauging algorithm and charger-control sections of the gauge. alternatively, the gauge can also measure internal temperature via its on-chip temperature sensor. refer to the pack configuration[temps] control bit. regardless of which sensor is used for measurement, a system processor can request the current battery temperature by calling the temperature() function (see data commands for more information). the temperature information is updated every 1 s in normal mode. the bq28550-r1 external temperature sensing is optimized with the use of a high accuracy negative temperature coefficient (ntc) thermistor with r25 = 10 k ? 1% and b25/85 = 3435 k ? 1% (such as semitec 103at for measurement). the shows additional circuit information for connecting this thermistor to the bq28550-r1 gas gauge. 10 submit documentation feedback copyright ? 2012 ? 2014, texas instruments incorporated product folder links: bq28550-r1
not recommended for new designs bq28550-r1 www.ti.com slusas4a ? october 2012 ? revised september 2014 7.3 over-temperature indication 7.3.1 over-temperature: charge if during charging temperature() reaches the threshold of ot chg for a period of ot chg time and averagecurrent() > chg current threshold , then the [oc] bit is set based on the charge fault configuration setting of the chg bit in the control status register. when temperature() falls to ot chg recovery , the [oc] bit is reset. if ot chg time = 0, the feature is completely disabled. 7.3.2 over-temperature: discharge if during discharging temperature() reaches the threshold of ot dsg for a period of ot dsg time , and averagecurrent() ? dsg current threshold , then the [dsgoffreq] bit is set. when temperature() falls to ot dsg recovery , the [dsgoffreq] bit is reset. if ot dsg time = 0, the feature is completely disabled. 7.4 gas gauging gas gauging information is accessed through a series of commands called standard commands. further capabilities are provided by the additional extended commands set. both sets of commands, indicated by the general format command() , are used to read and write information contained within the bq28550-r1 device control and status registers, as well as their data flash locations. commands are sent from the system to the gauge using the bq28550-r1 device ? s serial interface and can be executed during application development, pack manufacture, or end-equipment operation. cell information is stored in the bq28550-r1 non-volatile data flash memory. many of these data flash locations are accessible during application development. they cannot, generally, be accessed directly during end- equipment operation. access to these locations is achieved by using the bq28550-r1 device ? s companion evaluation software, through individual commands, or through a sequence of data-flash-access commands. to access a desired data flash location, the correct data flash subclass and offset must be known. the bq28550-r1 device provides 96 bytes of user-programmable data flash memory, partitioned into three, 32-byte blocks: manufacturer info block a , manufacturer info block b , and manufacturer info block c . for specifics on accessing the data flash, see manufacturer information blocks . the bq28550-r1 device ? s gas gauging prediction uses a compensated end of discharge voltage (cedv) method. this algorithm mathematically models the cell voltage as a function of the battery state-of-charge (soc), temperature, and current. the algorithm also models the battery impedance (z) as a function of soc and temperature, with other parameters included in the calculation. the battery voltage model is used to calibrate full charge capacity (fcc), and the compensated battery voltage can be used to indicate low battery voltage or alarm function through firmware settings (low battery %, fully discharged). the bq28550-r1 device measures discharge activity by monitoring the voltage across a small-value series sense resistor (5 m ? to 20 m ? typ) located between the cell ? and the battery ? s packn terminal. this information is used to integrate the battery discharge capacity and to estimate state of charge q. this is then calculated as a percentage of maximum capacity qmax to indicate remaining state-of-charge (rsoc). the maximum capacity parameter is updated on every full discharge cycle. there are other factors to be considered in estimating rsoc, such as battery impedance, temperature, and aging due to number of charge/discharge cycles. the equations used to determine the battery capacity factor these variables into the calculation based on battery chemistry. 7.5 protection 7.5.1 overcharge detector when charging a battery, if the v bat voltage becomes greater than the overcharge detection voltage (v det1 = 4.250 v typ) for a period up to the overcharge detection delay time (t det1 = 1.00 s typ), the bq28550-r1 device detects the overcharge state of the battery, and the cout pin transitions to a low level. this prohibits charging the battery by turning off the external charge control n-channel mosfet. copyright ? 2012 ? 2014, texas instruments incorporated submit documentation feedback 11 product folder links: bq28550-r1
not recommended for new designs bq28550-r1 slusas4a ? october 2012 ? revised september 2014 www.ti.com protection (continued) in the overcharge state, if a charger is removed and a load is connected, the external charge control mosfet conducts the load current through its parasitic body diode. if the v bat voltage becomes lower than the overcharge release voltage (v rel1 = 4.070 v typ) for a period up to the overcharge release delay time (t rel1 = 8 ms typ), the cout pin transitions to a high level, enabling charge of the battery by turning on the external charge control n-channel mosfet. 7.5.2 over-discharge detector when discharging a battery, if the v bat voltage becomes lower than the over-discharge detection voltage (v det2 = 2.3 v typ) for a period up to the over-discharge detection delay time (t det2 = 24 ms typ), the bq28550- r1 device detects the over-discharge state of the battery, and the dout pin transitions to a low level. this prohibits discharging the battery by turning off the external discharge control n-channel mosfet. in the over-discharge state, if a charger is connected, the external discharge control mosfet conducts the charge current through its parasitic body diode. if the v bat voltage becomes greater than the over-discharge detection voltage (v det2 = 2.3 v typ) for a period up to the overcharge release delay time (t rel2 = 4 ms typ), the dout pin transitions to a high level, enabling discharge of the battery by turning on the external discharge control n-channel mosfet. after detecting over-discharge, the device stops all operations and enters standby, which reduces the current consumed by the ic to its lowest mode (standby current). 12 submit documentation feedback copyright ? 2012 ? 2014, texas instruments incorporated product folder links: bq28550-r1
not recommended for new designs bq28550-r1 www.ti.com slusas4a ? october 2012 ? revised september 2014 protection (continued) 7.5.3 discharge overcurrent detector and short-circuit detector if the voltage across both protection mosfets (v m ? v ss ) becomes higher than the discharge overcurrent detection voltage (v det3 = 0.150 v typ) for a period of up to the discharge overcurrent detection delay time (t det3 = 12 ms typ), the bq28550-r1 device detects the discharge overcurrent state of the battery and the dout pin transitions to a low level. this prohibits discharging the battery by turning off the external discharge control n- channel mosfet. additionally, if the voltage across both protection mosfets (v m ? v ss ) becomes higher than the short-circuit voltage (v short = v bat ? 0.9 v typ) for a period of up to the discharge short-circuit detection delay time (t short = 400 s typ), the bq28550-r1 device detects a short-circuit of the battery and the dout pin transitions to a low level. this prohibits discharging the battery by turning off the external discharge control n-channel mosfet. copyright ? 2012 ? 2014, texas instruments incorporated submit documentation feedback 13 product folder links: bq28550-r1 bat dout cout vm v det1 v rel1 t v det2 bat v ss bat v ss pack C bat v ss pack C v det3 normal overcharge normal over-discharge normal t det2 t charger connected charger connected load connected shutdown t rel2 det1 rel1
not recommended for new designs bq28550-r1 slusas4a ? october 2012 ? revised september 2014 www.ti.com protection (continued) in both the discharge overcurrent and short-circuit states, an internal discharge overcurrent release resistor (20 k typ) is turned on (switched in between vm and vss), allowing the vm pin to be pulled down to the vss potential if the load is released. if the v m ? v ss voltage becomes lower than the discharge overcurrent detection voltage (v det3 = 0.150 v typ) for a period up to the discharge overcurrent release delay time (t rel3 = 4 ms typ), the discharge overcurrent release resistor is turned off and the dout pin transitions to a high level, enabling discharge of the battery by turning on the external discharge control n-channel mosfet. 14 submit documentation feedback copyright ? 2012 ? 2014, texas instruments incorporated product folder links: bq28550-r1 bat dout cout vm v det1 v rel1 t ocd v det2 bat v ss bat pack C bat v det3 normal discharge overcurrent normal normal t short t ocr t ocr load connected v short load short circuit load disconnected discharge overcurrent v ss v ss
not recommended for new designs bq28550-r1 www.ti.com slusas4a ? october 2012 ? revised september 2014 protection (continued) 7.5.4 charge overcurrent detector if the voltage across both protection mosfets (v m ? v ss ) becomes more negative than the charge overcurrent detection voltage (v det4 = ? 0.112 v typ) for a period up to the charge overcurrent detection delay time (t det4 = 12 ms typ) due to an abnormal charging current or abnormal charging voltage, the bq28550-r1 device detects the overcurrent charge state of the battery and the cout pin transitions to a low level. this prohibits charging the battery by turning off the external charge control n-channel mosfet. the bq28550-r1 device releases from the charge overcurrent detection state on by detecting the connection of a load for a period up to the overcharge release delay time (t rel4 = 4 ms typ). table 1. hardware control due to fault detection fault condition dout cout delay comment (typ) once ovp occurs for longer than the specified duration (1 s typ), the chg fet is turned off and bus communication is not valid. the system will support power to the load with overcharge voltage on off 1 s current flow through the chg fet parasitic diode. this can cause the cell to discharge; protection once the cell voltage reaches the overcharge release voltage for the specified duration (8 ms typ), the chg fet is turned on and bus communication is valid. if the cell is being charged with excessive current, the threshold will be based on a hardware limit measurement of ? 112 mv typ across the chg + dsg fet (vm ? vss) for a duration longer than 12 ms (typ), the chg fet is turned off and bus communication is not valid. this will prevent further charging of the cell. the setting of the chg bit in the overcurrent control status register is dependent on the oc bit setting in the charge fault register protection during on off 12 ms selection. the fet bit in the control between the charger is removed and cell voltage charging falls below the threshold for greater than 8 ms (typ). cout is turned back on. once the host mcu takes corrective action or if the battery charger is removed and there is a load detected for a period of 4 ms (typ), the chg fet is turned on and bus communication is valid. if the cell voltage falls to lower than 2.3 v for a duration of 24 ms (typ), the dsg fet is over discharging turned off, and bus communication is not valid. the system requires if the charger is off on 24 ms voltage protection connected and cell voltage rises above threshold for greater than 4 ms (typ), dout is turned back on and bus communication is valid. if the cell is being discharged with excessive current, the threshold will be based on a hardware limit measurement of 150 mv typ across the dsg + chg fet (vm ? vss) for a overcurrent duration longer than 12 ms (typ) the dsg fet is turned off and bus communication is protection during off on 12 ms not valid. this will prevent further discharging of the cell, and the dsg bit in the control discharging status register will be set. if the drop across the dsg + chg fet is less than the threshold or there is no load detected for a duration of 4 ms (typ), the dsg fet is turned on and bus communication is valid. detection of cell short circuit is measured at vm input. shorted cell detection is v bat ? 0.9 v for greater than 400 s at the vm terminal, and the dsg fet is turned off, and short-circuit off on 400 s bus communication is not valid. the dsg bit in the control status register will be set. protection the system will turn the dsg fet on if the voltage at vm is below 150 mv or no load is detected. 7.5.5 gas gauge control of discharge dout pin firmware control of dout for protection the gas gauge firmware can override the hardware-based protection by forcing dout low to turn off the discharge fet. however, the firmware cannot override the hardware protection to force discharge. there are three conditions that enable firmware to force dout low: 1. the host_disconnect (dsg fet off) subcommand: this feature is useful for the system to disable the discharge fet from the battery pack if it fails to authenticate. 2. pack removal detection by the sda and scl pins falling low for more than 2 seconds: the dout pin override condition is released upon detection of pack insertion. 3. firmware-based undervoltage detection: the dout pin is forced low if voltage of the cell falls below the set voltage threshold. the dout override condition is released when the voltage is above clear voltage. any one of the above three conditions will force the dout pin low. however, all three corresponding release conditions must be satisfied before the dout override is returned to hardware-based protection control. copyright ? 2012 ? 2014, texas instruments incorporated submit documentation feedback 15 product folder links: bq28550-r1
not recommended for new designs bq28550-r1 slusas4a ? october 2012 ? revised september 2014 www.ti.com 7.5.6 zero voltage charging when the cell voltage is 0 v and if the charger voltage is above the minimum operating voltage for 0 v charging (1.2-v max), the cout output transitions to a high level and charge current can flow. 7.5.7 fet control protection figure 2 shows an overview of the fet control protection operation. figure 2. fet control protection 16 submit documentation feedback copyright ? 2012 ? 2014, texas instruments incorporated product folder links: bq28550-r1 no charger attach a charge normal overcharge voltage protection overcurrent protection during charging shutdown short - circuit protection over -discharge protection chg: ondsg: off vreg: on chg: ondsg: off vreg: on chg: offdsg: on vreg: on chg: off dsg: on vreg: on chg: ondsg: on vreg: on chg: offdsg: off vreg: off chg: on dsg: off vreg: off for a period of t > 4.0 ms vm > C 0.9 v for a period of t > 400 s vm < 0.15 v orno load detected vm > 0.15 v for a period of 12 ms vm < 0.15 v or no load detectedfor a period of 4.0 ms vm < C 0.112 v for a period of 12 ms charger removed andload detected for a period of 4.0 ms > 4.25 v for a periodof 1.0 s < 2.3 v for a period of t > 24 ms during discharging overcurrent protection > 2.3 v bat v bat v bat v < 4.07 v for a period of 8.0 ms bat v bat v
not recommended for new designs bq28550-r1 www.ti.com slusas4a ? october 2012 ? revised september 2014 note when the chg fet or dsg fet is turned off due to fault conditions, bus communication is not valid. the bus communication will only be activated by removal of the fault condition (see table 1 ). 7.5.8 regulator regulator out voltage is fixed at typically 2.5 v with a minimum output capacitance of 0.1 f (0.47 f typ). there is an internal current limit designed for 60 ma (typ) when output is shorted to gnd. when vdd is over 8.0 v (typ), the regulator is turned off for the safety of the package dissipation. 7.6 feature description 7.6.1 auto-calibration the bq28550-r1 device provides an auto-calibration feature that measures the voltage offset error across srp and srn from time-to-time as operating conditions change. it subtracts the resulting offset error from the normal sense resistor voltage, vsr, for maximum measurement accuracy. auto-calibration of the adc begins on entry to sleep mode, except if temperature() is 5 c or temperature() 45 c. the gas gauge also performs a single offset when (1) the condition of averagecurrent() 100 ma and (2) {cell voltage change since the last offset calibration 256 mv} or {temperature change since last offset calibration is greater than 80 c for 60 s}. capacity and current measurements continue at the last measured rate during the offset calibration when these measurements cannot be performed. if the battery voltage drops more than 32 mv during the offset calibration, the load current has likely increased considerably and the offset calibration will be stopped. 7.6.2 serial 2-wire communication system the 2-wire communication bus supports a slave-only device in a single- or multi-slave configuration with a single- or multi-master configuration. the device can be part of a shared bus by the unique setting of the 7-bit slave address. the 2-wire communication is bi-directional, consisting of a serial data line (sda) and a clock line (scl). in receive mode, the sda terminal operates as an input; whereas, when the device is returning data to the master, the sda operates as an open-drain output with an external resistive pull-up. the master device controls the initiation of the transaction on the bus line. data transfer : each data bit is transferred during an scl clock cycle (transition from low-to-high and then high- to-low). the data signal on the sda (logic level) must be stable during the high period of the scl clock pulse. a change in the sda logic when scl is high is interpreted as a start or stop control signal. if a transfer is interrupted by a stop condition, the partial byte transmission shall not be latched. only the prior messages transmitted and acknowledged are latched. data format : the data is an 8-bit format with the most significant bit (msb) first and the least significant bit (lsb) followed by an acknowledge bit. if the slave cannot receive or transmit any byte of data until it services a priority interrupt, it can pull the scl line low to force the master device into wait state. the slave, once ready to resume data transfer, can release the scl line (get out of wait state). bus idle : the bus is considered idle or busy when no master device has control of this device. the sda and scl lines are high when the bus is idle. the appropriate method to go into the stop condition is to ensure the bus returns to idle state. start (s) and stop (p) conditions : to initiate communications, the master device transitions the sda line from high-to-low when the scl is high. conversely, to stop the communication, the sda goes low-to-high when the scl is high. to continue communication without terminating one transaction and beginning another, a repeated start (sr) method can be used without a stop condition being initiated. these are the only conditions (start or stop) when sda transitions when scl is high. copyright ? 2012 ? 2014, texas instruments incorporated submit documentation feedback 17 product folder links: bq28550-r1
not recommended for new designs bq28550-r1 slusas4a ? october 2012 ? revised september 2014 www.ti.com feature description (continued) acknowledge bits : an acknowledge bit (a) is required after each data transfer byte to ensure correct communications. this occurs when the receiving device pulls the sda low before the rising edge of the acknowledge-related clock pulse (ninth pulse), and keeps it low until the scl returns low. there is also a no- acknowledge bit (n), which occurs when the receiver releases the sda line (high) before the rising edge of acknowledge-related clock pulse, and maintains the sda line high until scl returns low. the acknowledge bit indicates if a successful data transfer has occurred between the master and slave device. monitoring this bit also indicates an unsuccessful data transfer due to the receiving device being busy or as system fault occurrence. communication format a start command immediately followed by a stop command is an illegal format. msb s slave address r/w a data a p s = start command r/w = read from slave device ("1") or write to slave device ("0") a = acknowledge bit p = stop command slave address = 7-bit address field for register address data = 8-bit data field pec = packet error checking slave to master master to slave communication format for multi-word with packet error checking (pec) table 2. write byte with pec 1 7 1 1 8 1 8 1 8 1 1 s slave address w a command a data byte a pec a p code table 3. write word with pec 1 7 1 1 8 1 8 1 8 1 8 1 1 s slave w a command a data byte a data byte a pec a p address code low high table 4. read byte with pec 1 7 1 1 8 1 1 7 1 1 8 1 8 1 1 s slave w a command a s slave r a data byte a pec a p address code address table 5. read word with pec 1 7 1 1 8 1 1 7 1 1 8 1 8 1 8 1 1 s slave address w a command a s slave r a data a data a pec a p code address byte byte low high 18 submit documentation feedback copyright ? 2012 ? 2014, texas instruments incorporated product folder links: bq28550-r1
not recommended for new designs bq28550-r1 www.ti.com slusas4a ? october 2012 ? revised september 2014 the communication format and protocol complies with the smbus. 7.6.3 programming 7.6.3.1 general purpose input-output 7.6.3.1.1 cfet control the gpio can be configured to provide a signal called charge fet control (cfet) using firmware. this output controls external circuitry to change the state of the external chg fet. a low signal on this pin in association with recommended external components turns off the chg fet. a high output maintains or turns on the chg fet after a valid turn off activity. the state of the gpio on power-up will be low until the system is initialized and an internal power supply is active. the cfet control bit is located in the control status register. if this output is not used, then connect this pin to vreg externally. the following parameters can be programmed in firmware for monitoring and protection using cfet control circuitry, providing the limits are set within the boundaries of the hardware thresholds: ? cell overvoltage condition ? overcurrent charging condition ? overtemperature charging condition 7.6.3.1.2 alert output another option for the gpio is to be configured as an alert output to indicate any one of the following fault conditions, and to provide an interrupt signal to the host microprocessor: ? overcurrent charging condition ? overcurrent discharging condition ? overtemperature condition ? overvoltage condition ? undervoltage condition the threshold trigger for these conditions is set through firmware registers, with each fault condition to be selectable for detection. the output is an open drain output with an external pull-up (through a 3.3k resistor). the alert output can be reset after the fault condition is removed or can be latched and reset only by the host mcu resetting the alert register value to zeroes. if this output is not used, then connect this pin to vreg externally. 7.6.4 communications 7.6.4.1 authentication the bq28550-r1 device can act as a sha-1/hmac authentication slave by using its internal engine. refer to the application note slua359 for sha-1/hmac for information. by sending a 160-bit sha-1 challenge message to the bq28550-r1 device, it causes the gauge to return a 160- bit digest, based upon the challenge message and a hidden, 128-bit plain-text authentication key. if this digest matches an identical one generated by a host or dedicated authentication master, and when operating on the same challenge message and using the same plain text keys, the authentication process is successful. 7.6.4.1.1 key programming (data flash key) by default, the bq28550-r1 device contains a default plain-text authentication key of 0x0123456789abcdeffedcba9876543210. this default key is intended for development purposes. it should be changed to a secret key and the part immediately sealed before putting a pack into operation. once written, a new plain-text key cannot be read again from the gas gauge while in sealed mode. once the bq28550-r1 device is full access, the authentication key can be changed from its default value by writing to the authentication() extended data command locations. a 0x00 is written to blockdatacontrol() to enable the authentication data commands. the bq28550-r1 device is now prepared to receive the 16-byte plain- text key, which must begin at the command location 0x40 and ending at 0x4f. once written, the key is accepted when a successful checksum for the key has been written to authenticatechecksum() . the gauge can then be sealed again. copyright ? 2012 ? 2014, texas instruments incorporated submit documentation feedback 19 product folder links: bq28550-r1
not recommended for new designs bq28550-r1 slusas4a ? october 2012 ? revised september 2014 www.ti.com 7.6.4.1.2 key programming (the secure memory key) as the name suggests, the bq28550-r1 secure-memory authentication key is stored in the secure memory of the bq28550-r1 device. if a secure-memory key has been established and the data flash key is 0x00000000000000000000000000000000, only this key can be used for authentication challenges (the programmable data flash key is not available). the selected key can only be established/programmed by special arrangements with ti, using ti ? s secure b-to-b protocol . the secure-memory key can never be changed or read from the bq28550-r1 device. 7.6.5 device functional modes the bq28550-r1 device has four power modes: normal, sleep, hibernate, and shutdown. in normal mode, the bq28550-r1 device is fully powered and can execute any allowable task. in sleep mode, the gas gauge exists in a reduced-power state, periodically taking measurements and performing calculations. in hibernate mode, the gas gauge is in a low power state, but can be awakened by communication or certain i/o activity. the device enters shutdown mode if there is a uvp condition detected or power down of the system. the relationship between these modes is shown in figure 3 . details are described in the sections that follow. figure 3. power mode diagram 7.6.5.1 normal mode the gas gauge is in normal mode when not in any other power mode. during this mode, averagecurrent() , voltage() , and temperature() measurements are taken, and the interface data set is updated. decisions to change states are also made. this mode is exited by activating a different power mode. because the gauge consumes the most power in normal mode, the algorithm minimizes the time the gas gauge remains in this mode. 20 submit documentation feedback copyright ? 2012 ? 2014, texas instruments incorporated product folder links: bq28550-r1 exit from sleep pack configuration [sleep ] =0 or | averagecurrent( ) | > sleep current or current is detected above i wake fuel gauging and data updated every 1 s normal fuel gauging and data updated every 20 seconds sleep disable all gas gauge subcircuits except gpio hibernate wakeup from hibernate communication activity and comm address is not for the gas gauge exit from hibernate v bat < por threshold por exit from wait _ hibernate cell relaxed and | averagecurrent () | < hibernate current or cell relaxed and v bat < hibernate voltage system hibernation exit from hibernate communication activity or the gas gauge clears control status [ hibernate ] = 0 recommend host also set control status [hibernate ] = 0 wait_hibernate fuel gauging and data updated every 20 s in low-power state of sleep . mode gas gauging and data are updated every 20 s. fullsleep system sleep fullsleep count down waitfullsleep entry to fullsleep host must set control status [fullsleep] = 1 exit from fullsleep any communication cmd exit from waitfullsleep any communication cmd entry to waitfullsleep full sleep wait time > 0 entry to fullsleep count < 1 exit from sleep ( host has set control status [ hibernate ] = 1 or < hibernate voltage _ exit from wait hibernate host must set control status [ hibernate ] = 0 and > hibernate voltage entry to sleep pack configuration [ sleep] = 1 and | averagecurrent( ) | = sleep current fuel gauge is off v = 0 v shutdown entry to shutdown no charger present system shutdown pre - shutdown fuel gauging stopped discharge fet opened i bat = hibernate entry to pre - shutdown [shutdown ] = 1 exit from pre - shutdown communication activity or current detected > i wake exit from shutdown charger detected and protection fets closed v bat bat v bat
not recommended for new designs bq28550-r1 www.ti.com slusas4a ? october 2012 ? revised september 2014 note when the battery is connected for the first time, discharging may not be enabled. for this case, the following procedure is required: ? short the vm pin and vss pin, or ? connect the charger to the system such that the ic returns to normal status. 7.6.5.2 sleep mode sleep mode is entered automatically if the feature is enabled ( operation configuration [sleep] ) = 1) and averagecurrent() is below the programmable level sleep current . once entry into sleep mode has been qualified, but prior to entering it, the bq28550-r1 device performs an adc auto-calibration to minimize offset. while in sleep mode, the gas gauge can suspend serial communications as much as 4 ms by holding the comm line(s) low. this delay is necessary to correctly process host communication, because the gas gauge processor is mostly halted in sleep mode. during sleep mode, the bq28550-r1 device periodically takes data measurements and updates its data set. however, a majority of its time is spent in an idle condition. the bq28550-r1 device exits sleep if any entry condition is broken, specifically when (1) averagecurrent() rises above sleep current , or (2) a current in excess of i wake through rsense is detected. 7.6.5.3 fullsleep mode fullsleep mode is entered automatically if the feature is enabled by setting the configuration [fullsleep] bit in the control status register when the bq28550-r1 device is in sleep mode. the gauge exits fullsleep mode when there is any communication activity. therefore, the execution of set_fullsleep sets the [fullsleep] bit, but evsw might still display the bit clear. fullsleep mode can be verified by measuring the current consumption of the gauge. in this mode, the high frequency oscillator is turned off. the power consumption is further reduced in this mode compared to the sleep mode. fullsleep mode can also be entered by setting the full sleep wait time to be a number larger than 0. fullsleep will be entered when the timer counts down to 0. this feature is disabled when the data flash is set as 0. during fullsleep mode, the bq28550-r1 device periodically takes data measurements and updates its data set. however, a majority of its time is spent in an idle condition. the bq28550-r1 device exits sleep if any entry condition is broken, specifically when (1) averagecurrent() rises above sleep current , or (2) a current in excess of i wake through rsense is detected. while in fullsleep mode, the gas gauge can suspend serial communications as much as 4 ms by holding the comm line(s) low. this delay is necessary to correctly process host communication, because the gas gauge processor is mostly halted in sleep mode. 7.6.5.3.1 clearing fullsleep mode fullsleep mode will stay on permanently if full sleep wait time is not set to 0. clearing fullsleep mode: ? if full sleep wait time is set to 0, the clear condition clears the flag. if it is not set to 0, the clear condition resets the timer. ? the clear condition determines that there is i 2 c ? communication while fullsleep is active. i 2 c communication while not in fullsleep will not clear the flag. this means if there is current flowing when the fullsleep command is sent, there is no way to clear it until after the device enters sleep mode. 7.6.5.4 hibernate mode hibernate mode should be used when the host system needs to enter a low-power state, and minimal gauge power consumption is required. this mode is ideal when the host is set to its own hibernate, shutdown, or off modes. the gas gauge can enter hibernate due to either low cell voltage or low load current. ? hibernate due to the load current ? if the gas gauge enters hibernate mode due to the load current, the [hibernate] bit of the control_status register must be set. the gauge waits to enter hibernate copyright ? 2012 ? 2014, texas instruments incorporated submit documentation feedback 21 product folder links: bq28550-r1
not recommended for new designs bq28550-r1 slusas4a ? october 2012 ? revised september 2014 www.ti.com mode until it has taken a valid ocv measurement and the magnitude of the average cell current has fallen below hibernate current. ? hibernate due to the cell voltage ? when the cell voltage drops below the hibernate voltage and a valid ocv measurement has been taken, the gas gauge enters hibernate mode. the [hibernate] bit of the control register has no impact for the gas gauge to enter the hibernate mode. if the [shutdown] bit of control _status is also set. the gauge will remain in hibernate mode until communication activity appears on the communication lines. upon exiting hibernate mode, the [hibernate] bit of control_status is cleared. because the gas gauge is dormant in hibernate mode, the battery should not be charged or discharged in this mode, because any changes in battery charge status will not be measured. if necessary, the host equipment can draw a small current (generally infrequent and less than 1 ma, for purposes of low-level monitoring and updating); however, the corresponding charge drawn from the battery will not be logged by the gauge. once the gauge exits to normal mode, the algorithm re-establishes the correct battery capacity. if a charger is attached, the host should immediately take the gas gauge out of hibernate mode before beginning to charge the battery. caution charging the battery in hibernate mode results in a notable gauging error that will take several hours to correct. 7.6.5.5 shutdown mode the device enters shutdown mode if there is a uvp condition detected or if there is a power down of the system, and alternatively by setting the shutrq bit to 1, if appropriate conditions are met. the device can also disable shutdown by using the clear_shutdown (0x0014) option. note ? a shutdown command should not be invoked if charger voltage is present. ? sending a shutdown command while charger voltage is present causes a 1 ? 2 s time of dsg fet off, and may or may not cause a watchdog reset. (if current is 0 after the dsg fet is opened, it will attempt to shutdown and start a watchdog; otherwise, it will only clear the shutdown flag without a reset). figure 4 shows an overview of the hardware controlled shutdown operation. 22 submit documentation feedback copyright ? 2012 ? 2014, texas instruments incorporated product folder links: bq28550-r1
not recommended for new designs bq28550-r1 www.ti.com slusas4a ? october 2012 ? revised september 2014 figure 4. shutdown operation 7.6.5.6 operational modes the sequence of the operational modes is as follows: normal to sleep to fullsleep; fullsleep to either hibernate or shutdown; or sleep to shutdown. table 6. operational modes mode enter mode exit mode comment go into other modes like sleep, if all conditions such as average in this mode, power consumption is fullsleep, hibernate, or normal current, cell voltage, and the highest. measurements are taken shutdown mode if conditions are temperature are satisfied. and updated every 1 s. satisfied. copyright ? 2012 ? 2014, texas instruments incorporated submit documentation feedback 23 product folder links: bq28550-r1 no charger charger attached normal shutdown < 2.3 v for a period of t > 24 ms over - discharge voltage dsg "off fg turn off dsg fg shutdown chg: on dsg: off vreg off chg: on dsg: on vreg: on chg: on dsg: off vreg: on chg: off dsg: off vreg: off fg turn on dsg for a period of t > 4.0 ms for a period of t > 24 ms < 2.3 v v bat v bat > 2.3 v v bat
not recommended for new designs bq28550-r1 slusas4a ? october 2012 ? revised september 2014 www.ti.com table 6. operational modes (continued) mode enter mode exit mode comment sleep bit set = 1 in operation change sleep bit = 0 or register and averagecurrent averagecurrent measurement > sleep the data is measured every 20 s to sleep measured is equal to sleep current current value or current detected is reduce current consumption. value. above the i wake setting. from sleep mode if the wait_fullsleep wait is the system exits the fullsleep the wait time to enter fullsleep programmed, this is the time the mode if there are any communication fullsleep from sleep is 1 s to 240 s with the system must be in sleep mode commands set on the bus to the default at 15 s. before it can go to fullsleep device. mode. from fullsleep mode, the system will go into hibernate mode if the the system exits this mode is the load current decreases to the v cell > programmed threshold, enters hibernation if v cell range is programmed value, or load current is > programmed 2.4 v to 3 v with default at 2.55 v. hibernation or if the cell voltage falls below the threshold, the load current threshold range is 0 programmed value, or communication activity on bus line, to 0.7 a with a default value of 8 ma. or the host sets the command in or host sets the command in mac. mac. from sleep mode, the system will exit from this mode if there is bus in this mode, the vreg and dsg enter this mode if the v cell < 2.4 v activity, fet are turned off and the system for a period longer than 24 ms and or the load current detected is > shutdown will only wake up if the charger is the charger is not attached. the i wake , attached on the pack+, pack ? system can also be put in or the charger is connected to the terminals. shutdown mode through mac. system. 7.6.5.7 data commands 7.6.5.7.1 standard data commands the bq28550-r1 device uses the following command code. data ram is updated and read by the gauge only once per second. standard commands are accessible in normal operation mode. table 7. standard commands name command code min value max value default value units sealed access manufactureraccess() 0x00 0x0000 0xffff ? ? r/w batterymode() 0x03 0x0000 0xe383 ? ? r/w temperature() 0x08 0 65535 ? 0.1k r voltage() 0x09 0 65535 ? mv r current() 0x0a ? 32768 32767 ? ma r averagecurrent() 0x0b ? 32768 32767 ? ma r maxerror() 0x0c 0% 100% ? r relativestateofcharge() 0x0d 0% 100% ? r mah or 10 remainingcapacity() 0x0f 0 65535 ? r/w mwh fullchargecapacity() 0x10 0 65535 7200 ma r chargingcurrent() 0x14 0 65534 2500 ma r chargingvoltage() 0x15 0 65534 12600 mv r batterystatus() 0x16 0x0000 0xdbff ? ? r cyclecount() 0x17 0 65535 0 ? r/w designcapacity() 0x18 0 65535 7200 mah r/w designvoltage() 0x18 0 65535 3600 mv r/w specificationinfo() 0x1a 0x0000 0xffff 0x0031 ? r/w manufacturedate() 0x1b ? ? 0 ascii r/w serialnumber() 0x1c 0x0000 0xffff 0x0001 ? r/w manufacturername 0x20 ? ? texas inst ascii r/w 24 submit documentation feedback copyright ? 2012 ? 2014, texas instruments incorporated product folder links: bq28550-r1
not recommended for new designs bq28550-r1 www.ti.com slusas4a ? october 2012 ? revised september 2014 table 7. standard commands (continued) name command code min value max value default value units sealed access devicename() 0x21 ? ? bq28550-r1 ascii r/w devicechemistry() 0x22 ? ? lion ascii r/w manufacturerdata() 0x23 ? ? ? ascii r/w authenticate() 0x2f ? ? ? ascii r cellvoltage1() 0x3f 0 65535 ? mv r extended sbs data commands operationstatus() 0x54 0x0000 0xffff ? 0xf7f7 r chargingstatus() 0x55 0x0000 0xffff ? ? r unsealkey() 0x60 0x00000000 0xffffffff ? ? r/w fullaccesskey() 0x61 0x00000000 0xffffffff ? ? r/w authenkey0() 0x63 0x00000000 0xffffffff ? ? r/w authenkey1() 0x64 0x00000000 0xffffffff ? ? r/w authenkey2() 0x65 0x00000000 0xffffffff ? ? r/w authenkey3() 0x66 0x00000000 0xffffffff ? ? r/w manufacturerinfo() 0x70 ? ? ? ascii r/w senseresistor() 0x71 0 65535 ? ? r/w temperature() 0x72 0x0000 0xffff ? ? r manufacturerstatus() 0xb1 ? ? r 7.6.5.7.2 run-time-to-empty battery pack run-time-to-empty can be calculated using the following method ? the host system reads and stores the following information during a discharge period and averages the data over a user-determined period of time: ? the dsg bit of the batterystatus register is set to ensure dout terminal is high (ensure the system is in discharge mode). ? averagecurrent (ma) ? positive value = charge current ? negative value = discharge current ? one minute rolling average of current value (the user can accumulate this time for improved granularity) ? remainingcapacity (mah) run-time-to-empty = remainingcapacity (avg mah) averagecurrent (ma). this result will be in hours, and therefore to convert to minutes, divide the results by 60. 7.6.5.7.3 charging time to full this is a read-only function that predicts the remaining time until battery reaches full charge in minutes based on average current() . the computation accounts for the taper current time extension from the linear ttf computation based on a fixed average current() rate of change of accumulation. a value of 65,535 indicates a battery is not being charged. 7.6.5.7.4 remaining capacity alert to set a notification when battery capacity is below a pre-determined value, the user can set a remaining capacity alarm alert in the system side. the remaining capacity value determined by the bq28550-r1 device is compared to the user-selected value. if the remaining capacity value < the user-selected remaining capacity threshold, the host system should instruct the user on what action is needed. copyright ? 2012 ? 2014, texas instruments incorporated submit documentation feedback 25 product folder links: bq28550-r1
not recommended for new designs bq28550-r1 slusas4a ? october 2012 ? revised september 2014 www.ti.com 7.6.5.7.5 remaining time alert similar to the remaining capacity notification, a system may require an alarm based on time rather than remaining capacity. to set a notification when remaining time to empty is less than the user-set value, the user can set a remaining time to empty alarm alert in the system side. the remaining time to empty value determined by the bq28550-r1 device is compared to the user-selected value. if the remaining time to empty value < the user-selected remaining time to empty threshold, the host system should instruct the user of what action to take. 7.6.5.7.6 data flash interface 7.6.5.7.6.1 accessing the data flash the bq28550-r1 data flash is a non-volatile memory that contains bq28550-r1 initialization, default, cell status, calibration, configuration, and user information. the data flash can be accessed in several different ways, depending on what mode the bq28550-r1 device is operating in and what data is being accessed. commonly accessed data flash memory locations, frequently read by a system, are conveniently accessed through specific instructions, as described in . these commands are available when the bq28550-r1 device is either in full access, unsealed, or sealed modes. most data flash locations, however, are only accessible in full access or unsealed mode by using the bq28550-r1 evaluation software or by data flash block transfers. these locations should be optimized and/or fixed during the development and manufacture processes. they become part of a golden image file and can then be written to multiple battery packs. once established, the values generally remain unchanged during end- equipment operation. 7.6.5.7.6.2 read-write access of data flash to read and write commands in data flash, the following method is used: command type sbs command sbs data description manufactureraccess() command to set up the data flash (df) address write word 0x00 0x1yy in order to write a row (32-byte) of data. yy = the row number where the target df address is located. manufacturerinput() command. issue this command after setting up the read/write block 0x2f 32-byte of data df address to read/write the 32-byte data to the df. the following is an example procedure to update a parameter in data flash. 1. identify the physical byte location of the target parameter using the class and subclass id information. this is typically the subclass id + offset. 2. identify the target row number by truncating the division of the byte location and the row length; for example, a byte location 27 would be in row: 27 divided by 32 = row number 0. 3. byte location within the target row is determined by: byte index = physical location ? (row number * row length) byte index = 27 ? (0 *32) = 27 the target byte is in row 0 byte 27. 4. using mac command 0x1yy, where yy = row number. in this example, the smbus write command would be 0x100. 5. read the original target row first through a block read command 0x2f before updating. 6. store original data in memory array, so the appropriate byte(s) can be updated. smbus block read cmd = 0x2f, length = 32 byte 7. store the read data into a memory array (for example, yrowdataarray). 8. update the target byte (yrowdataarray(27). 9. write the updated yrowdataarray() array back to the device data flash. to do this, repeat step 4. issue smbus block write cmd = 0 27, length 32. 10. a read verify is recommended to ensure the data flash has been re-programmed correctly. to do a read verify, repeat steps 4 and 5. 26 submit documentation feedback copyright ? 2012 ? 2014, texas instruments incorporated product folder links: bq28550-r1
not recommended for new designs bq28550-r1 www.ti.com slusas4a ? october 2012 ? revised september 2014 7.6.5.7.6.2.1 flash updates data flash can only be updated if voltage() flash update ok voltage . flash programming current can cause an increase in ldo dropout. the value of flash update ok voltage should be selected so that the bq28550-r1 v cc voltage does not fall below its minimum of 2.4 v during flash write operations. 7.6.5.7.7 manufacturer information blocks the bq28550-r1 device contains 96 bytes of user-programmable data flash storage: manufacturer info block a , manufacturer info block b , manufacturer info block c . the method for accessing these memory locations is slightly different, depending on whether the device is in full access, unsealed, or sealed mode. 7.6.5.7.8 access modes the bq28550-r1 device provides three security modes (full access, unsealed, and sealed) that control data flash access permissions. data flash refers to those data flash locations that are accessible to the user, as specified in table 8 . table 8. data flash access security mode sbs commands data flash device programming standard and extended full access r/w yes commands r/w standard and some extended unsealed r/w no commands r/w sealed standard commands r/w none no 7.6.6 charging and charge termination indication 7.6.6.1 detection charge termination for proper bq28550-r1 operation, the user must specify cell charging voltage. the default value for this variable is in the data flash charging voltage . the bq28550-r1 device detects charge termination when: the battery current drops below the taper current for two consecutive current taper window time periods during charging and battery voltage is equal to or higher than the charging voltage ? taper voltage . full charge is set when the taper condition is met. 7.6.6.2 charge suspend the bq28550-r1 device suspends charging when: ? temperature < jt1, or ? temperature > jt4 in charge-suspend mode, if the [chgsusp] bit in operationconfiguration is set. this will set the charging current to zero and the charging voltage to zero in the safety status register. also, the chg bit is reset in controlstatus register. the bq28550-r1 device can indicate to resume charging if: ? temperature jt1 + temp hys, and ? temperature jt3 ? temp hys. on resuming, the bq28550-r1 device sets the chg bit in the controlstatus register, and sets chargingcurrent according to the appropriate charging mode entered. the bq28550-r1 device also leaves the charge-suspend mode when the battery is removed in removable battery mode ([nr] = 0). 7.6.6.3 manufacturer access(): 0x00/0x01 issuing a control() command requires a subsequent 2-byte subcommand. these additional bytes specify the particular control function desired. the control() command allows the system to control specific features of the bq28550-r1 device during normal operation, and additional features when the device is in an access mode (described in table 9 ). copyright ? 2012 ? 2014, texas instruments incorporated submit documentation feedback 27 product folder links: bq28550-r1
not recommended for new designs bq28550-r1 slusas4a ? october 2012 ? revised september 2014 www.ti.com table 9. control() subcommands cntl function cntl data sealed access description set the [fullsleep] bit in control set_fullsleep 0x0010 yes status register to 1 forces control_status set_hibernate 0x0011 yes [hibernate] to 1 forces control_status clear_hibernate 0x0012 yes [hibernate] to 0 forces control_status set_shutdown 0x0013 yes [shutdown] to 1 forces control_status clear_shutdown 0x0014 yes [shutdown] to 0 forces the dout pin low to host_disconnect 0x0017 yes disable discharge. forces the dout pin high to host_enable 0x0018 yes enable discharge. 7.6.6.4 control status: 0x0000 instructs the gas gauge to return status information to control status 0x00/0x01. the status word should include the following information. table 10. control status flags bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 high byte rsvd rsvd rsvd rsvd cca bca rsvd rsvd low byte shutrq hibernate fullsleep sleep dsgoffreq rsvd chg dsg low byte bit 0 = dsg fet status, 1 = discharging allowed (dsg fet on), 0 = discharging not allowed ( dsg fet turned off). bit 1 = chg fet status, 1 = charging allowed (chg fet on), 0 = charging not allowed action to be taken by host mcu. bit 2 = rsvd (reserved) bit 3 = dsgoffreq, dsg fet off requested bit 4 = sleep, status bit indicating the device is in sleep mode. true when set. bit 5 = fullsleep, status bit indicating the device is in fullsleep mode. true when set. the state can be detected by monitoring the power used by the device because any communication will automatically clear it. bit 6 = hibernate, status bit indicating a request for entry into hibernate from sleep mode has been issued. true when set. default is 0. control bit when set will put the device into the lower power state of sleep mode. it is not possible to monitor this bit. bit 7 = shutrq. status bit indicating the gas gauge is enabled to enter shutdown mode. true when set. default is 0. bit 7 = shutrq, 1 = shutdown requested high byte bit 0, 1 = rsvd (reserved) bit 2 = bca = status bit indicating the device board calibration routine is active. active when set. bit 3 = cca = status bit indicating the device coulomb counter calibration routine is active. active when set. bit 4, 5, 6, 7 = rsvd (reserved) the following mac commands are also available. 28 submit documentation feedback copyright ? 2012 ? 2014, texas instruments incorporated product folder links: bq28550-r1
not recommended for new designs bq28550-r1 www.ti.com slusas4a ? october 2012 ? revised september 2014 7.6.6.4.1 set_fullsleep: 0x0010 instructs the gas gauge to set the fullsleep bit in the control status register to 1. this allows the gauge to enter the fullsleep power mode after the transition to sleep power state is detected. in fullsleep mode, less power is consumed by disabling an oscillator circuit used by the communication engines. a communication to the device in fullsleep forces it back to sleep mode. 7.6.6.4.2 set_hibernate: 0x0011 instructs the gas gauge to force the control_status [hibernate] bit to 1. this allows the gauge to enter the hibernate power mode after the transition to sleep power state is detected. the [hibernate] bit is automatically cleared upon exiting from hibernate mode. 7.6.6.4.3 clear_hibernate: 0x0012 instructs the gas gauge to force the control_status [hibernate] bit to 0. this prevents the gauge from entering the hibernate power mode after the transition to sleep power state is detected. it can also be used to force the gauge out of hibernate mode. 7.6.6.4.4 set_shutdown: 0x0013 sets the control_status [shutdown] bit to 1, enabling the device to enter shutdown mode if the appropriate conditions are met. 7.6.6.4.5 clear_shutdown: 0x0014 clears the control_status [shutdown] bit to 1, disabling the device from entering shutdown mode. 7.6.6.4.6 dsg fet off (host_disconnect): 0x0017 instructs the gas gauge to force the protection dout pin to low level. this prohibits discharging the battery by turning off the external discharge control n-channel mosfet. 7.6.6.4.7 dsg fet on (host_connect): 0x0018 instructs the gas gauge to force the protection dout pin to high level. this allows discharging the battery by turning on the external discharge control n-channel mosfet. copyright ? 2012 ? 2014, texas instruments incorporated submit documentation feedback 29 product folder links: bq28550-r1
not recommended for new designs bq28550-r1 slusas4a ? october 2012 ? revised september 2014 www.ti.com 8 application and implementation note information in the following applications sections is not part of the ti component specification, and ti does not warrant its accuracy or completeness. ti ? s customers are responsible for determining suitability of components for their purposes. customers should validate and test their design implementation to confirm system functionality. 8.1 typical application figure 5. application ? cfet 30 submit documentation feedback copyright ? 2012 ? 2014, texas instruments incorporated product folder links: bq28550-r1 doutcout vm bat vreg vss gpioscl ts srp srn vreg pack + pack C celln cellp s s d 12 3 4 5 6 12 11 10 9 8 7 sda 10 m ! 0.1 f 510 ! 100 ! sda scl fuse dsg chg 13 pwpd 100 ! 100 k 5v6 5v6 5k 12k vreg bc847bpdxv6 5 m 5 m 0.47 f 0.1 f 0.1 f 0.1 f 0.1 f 100 ! 100 ! 100 ! 100 !
not recommended for new designs bq28550-r1 www.ti.com slusas4a ? october 2012 ? revised september 2014 typical application (continued) figure 6. application ? alert copyright ? 2012 ? 2014, texas instruments incorporated submit documentation feedback 31 product folder links: bq28550-r1 cell+ cellC wake cout vm dout vreg pack+ packC pack+/load+ packC/loadC sda scl gnd cell+ cellC hdq gnd 1 dout 2 cout 3 vm 4 bat 5 vreg 6 vss 7 srp 8 srn 9 ts 10 sda 11 scl 12 hdq 13 pwpd u1 b q 2 8 5 0 s1 r3 100 r2 100 c3 0.1uf c4 0.1uf r45 m r55 m r6 510 c5 0.1uf c6 1uf c7 0.47uf c8 0.1uf rt1 10k 12 j3 1 2 3 4 j1 r10 100 r11 100 r12 100 d1 mm3z5v6c d2 r13 1k tp1 tp2 tp5 tp6 tp7 tp8 tp4 tp3 12 j4 r143.3k 12 j2 c1 0.1uf c2 0.1uf r10.005 q3-a tr-bc847bpdxv6t1 q3-b tr-bc847bpdxv6t1 r1512k r165.1k r17 100k r83.3k 12 j5 12 j6 r9 100 r73.3k 1 2 3 4 j7 r18 100 d3 mm3z5v6c r19 100 q1 note: r4 and r5 must be greater than 3 m . q2 csd16340q3 1 vbus 2 dC 3 d+ 4 id 5 gnd 6 case 7 case j8 usb mini-ab 1 2 3 tb1 12 3 tb2 gnd side gnd side gnd side gnd side vreg hdq hdq earth_gnd earth_gnd earth_gnd earth_gnd csd16340q3 5 r 1 doutcout vm bat vreg vss gpioscl ts srp srn vreg pack + pack C celln cellp s s d 0.1 f 12 3 4 5 6 12 11 10 9 87 sda 10 m ! 100 ! 100 ! 0.1 0.1 0.1 0.1 510 ! 100 ! sda scl fuse dsg chg 13 pwpd 100 ! 3.3k vreg 100 ! 5v6 5v6 5v6 alert 5 m 5 m 0.47 f f f f f 100 ! 100 ! 100 !
not recommended for new designs bq28550-r1 slusas4a ? october 2012 ? revised september 2014 www.ti.com typical application (continued) figure 7. typical application schematic 32 submit documentation feedback copyright ? 2012 ? 2014, texas instruments incorporated product folder links: bq28550-r1
not recommended for new designs bq28550-r1 www.ti.com slusas4a ? october 2012 ? revised september 2014 9 device and documentation support 9.1 related documentation 9.1.1 documentation support for more information, see the bq28551-r1 technical reference manual ( sluu889 ). 9.2 trademarks i 2 c is a trademark of nxp b.v. corporation. 9.3 electrostatic discharge caution this integrated circuit can be damaged by esd. texas instruments recommends that all integrated circuits be handled with appropriate precautions. failure to observe proper handling and installation procedures can cause damage. esd damage can range from subtle performance degradation to complete device failure. precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. 9.4 glossary slyz022 ? ti glossary . this glossary lists and explains terms, acronyms, and definitions. copyright ? 2012 ? 2014, texas instruments incorporated submit documentation feedback 33 product folder links: bq28550-r1
not recommended for new designs bq28550-r1 slusas4a ? october 2012 ? revised september 2014 www.ti.com 10 mechanical, packaging, and orderable information the following pages include mechanical, packaging, and orderable information. this information is the most current data available for the designated devices. this data is subject to change without notice and revision of this document. for browser-based versions of this data sheet, refer to the left-hand navigation. 34 submit documentation feedback copyright ? 2012 ? 2014, texas instruments incorporated product folder links: bq28550-r1
package option addendum www.ti.com 29-aug-2014 addendum-page 1 packaging information orderable device status (1) package type package drawing pins package qty eco plan (2) lead/ball finish (6) msl peak temp (3) op temp (c) device marking (4/5) samples bq28550drzr nrnd son drz 12 3000 green (rohs & no sb/br) cu nipdau level-2-260c-1 year -40 to 85 bq 2855 BQ28550DRZR-R1 nrnd son drz 12 3000 green (rohs & no sb/br) cu nipdau level-2-260c-1 year -40 to 85 bq28 50r1 bq28550drzt nrnd son drz 12 250 green (rohs & no sb/br) cu nipdau level-2-260c-1 year -40 to 85 bq 2855 bq28550drzt-r1 nrnd son drz 12 250 green (rohs & no sb/br) cu nipdau level-2-260c-1 year -40 to 85 bq28 50r1 (1) the marketing status values are defined as follows: active: product device recommended for new designs. lifebuy: ti has announced that the device will be discontinued, and a lifetime-buy period is in effect. nrnd: not recommended for new designs. device is in production to support existing customers, but ti does not recommend using this part in a new design. preview: device has been announced but is not in production. samples may or may not be available. obsolete: ti has discontinued the production of the device. (2) eco plan - the planned eco-friendly classification: pb-free (rohs), pb-free (rohs exempt), or green (rohs & no sb/br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. tbd: the pb-free/green conversion plan has not been defined. pb-free (rohs): ti's terms "lead-free" or "pb-free" mean semiconductor products that are compatible with the current rohs requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. where designed to be soldered at high temperatures, ti pb-free products are suitable for use in specified lead-free processes. pb-free (rohs exempt): this component has a rohs exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. the component is otherwise considered pb-free (rohs compatible) as defined above. green (rohs & no sb/br): ti defines "green" to mean pb-free (rohs compatible), and free of bromine (br) and antimony (sb) based flame retardants (br or sb do not exceed 0.1% by weight in homogeneous material) (3) msl, peak temp. - the moisture sensitivity level rating according to the jedec industry standard classifications, and peak solder temperature. (4) there may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) multiple device markings will be inside parentheses. only one device marking contained in parentheses and separated by a "~" will appear on a device. if a line is indented then it is a continuation of the previous line and the two combined represent the entire device marking for that device. (6) lead/ball finish - orderable devices may have multiple material finish options. finish options are separated by a vertical ruled line. lead/ball finish values may wrap to two lines if the finish value exceeds the maximum column width.
package option addendum www.ti.com 29-aug-2014 addendum-page 2 important information and disclaimer: the information provided on this page represents ti's knowledge and belief as of the date that it is provided. ti bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. efforts are underway to better integrate information from third parties. ti has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ti and ti suppliers consider certain information to be proprietary, and thus cas numbers and other limited information may not be available for release. in no event shall ti's liability arising out of such information exceed the total purchase price of the ti part(s) at issue in this document sold by ti to customer on an annual basis.
tape and reel information *all dimensions are nominal device package type package drawing pins spq reel diameter (mm) reel width w1 (mm) a0 (mm) b0 (mm) k0 (mm) p1 (mm) w (mm) pin1 quadrant bq28550drzr son drz 12 3000 330.0 12.4 2.8 4.3 1.2 4.0 12.0 q2 BQ28550DRZR-R1 son drz 12 3000 330.0 12.4 2.8 4.3 1.2 4.0 12.0 q2 bq28550drzt son drz 12 250 330.0 12.4 2.8 4.3 1.2 4.0 12.0 q2 bq28550drzt-r1 son drz 12 250 330.0 12.4 2.8 4.3 1.2 4.0 12.0 q2 package materials information www.ti.com 7-jul-2015 pack materials-page 1
*all dimensions are nominal device package type package drawing pins spq length (mm) width (mm) height (mm) bq28550drzr son drz 12 3000 338.1 338.1 20.6 BQ28550DRZR-R1 son drz 12 3000 338.1 338.1 20.6 bq28550drzt son drz 12 250 338.1 338.1 20.6 bq28550drzt-r1 son drz 12 250 338.1 338.1 20.6 package materials information www.ti.com 7-jul-2015 pack materials-page 2

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