TEXAS INSTRUMENTS bq2058T handbook
Contents
1. When the bq2058T enters the low power sleep mode DSG is driven low and the device consumes 0 7uA typi cal The bq2058T only comes out of low power sleep mode when a valid charge detect condition exists Charge Detect The bq2058T continuously monitors for a charge detect condition A valid charge detect condition exists when ei ther of the conditions is true CSL lt BATon 70mV Vcp CSH gt BAT1p 70mvV Vcp A valid charge detect enables the DSG output allowing charging of the lithium ion cells This is accomplished by applying the charging supply tothe pack Undervoltage Undervoltage or overdischarge protection is asserted when any cell voltage drops below the Vuv threshold and remains below the Vuv threshold for a time exceeding a user configurable delay tuvp The DSG output is driven low disabling the discharge of the pack The bq2058T then enters the low power sleep mode Vuv is defined as follows Vuv 2 25V Overvoltage Overvoltage or overcharge protection is asserted when any cell voltage exceeds the Voy threshold and remains above the Vov threshold for a time exceeding a user configurable delay tovp The CHG pin goes to the high impedance state disabling charge into the battery pack Since the charge control output is an open drain output a pull down resistor is needed from the CHG pin to the negative side of the pack This pulls the gate of the charge FET low when the CHG pin goes to high im p2. pulled low externally 4 All cell voltages fall below Vce causing CHG to go high 5 Stop charging apply a load 6 An overcurrent condition is detected initiating the overcurrent delay timer 7 The overcurrent delay time expires causing DSG to go low 8 The overcurrent condition is no longer present DSG is driven high 9 Pin CTL is driven high both DSG and CHG go inactive 10 Pin CTL is driven low both DSG and CHG go active resuming their normal function 11 One or more cells fall below Vuv initiating the overdischarge delay timer 12 Once the overdischarge delay timer expires if any of the cells is below Vuy the bq2058T drives DSG low and enters the low power sleep mode July 15 1997 bq2058T Absolute Maximum Ratings Symbol Parameter Value Unit Conditions Vcc Supply voltage 18 V Relative to Vss TOPR Operating temperature 30 to 70 C Tsrc Storage temperature 55 to 4125 SC TSOLDER Soldering temperature 260 C For 10 seconds lin Maximum input current 100 uA All pins except Vcc Vss Notes 1 Permanent device damage may occur if Absolute Maximum Ratings are exceeded Functional operation should be limited to the Recommended DC Operating Conditions detailed in this data sheet E xposure to conditions beyond the operational limits for extended periods of time may affect device reliability 2 Internal protection diodes are in place on every pin relative to Vcc and Vss See pictu
3. supply path Battery 1 positive input This input is connected to the positive terminal of the cell designated BAT 1 in Figure 2 July 1997 bq2058T Sel2 Sell 4 Cell Inputs e j II Pin 9 B1P Pin 8 BIN a 24 Pin 7 B2N 1 i Vov Pin 3 i il ji DQ Chip Negative gt J ck Sel2 Supply GB DQ Sel GK QB o Sel CK Any_Above_Voy Over_charge Pin 1 Edg ou Non Retrigger Reset Oneshot Capacitor Discharge Off Delay Capacitor Input All Below VcE t gt Pine 800 Overcurrent Delay Capacitor Input Any Below VUN Edge Dou Non Retrigger Reset Oneshot Capacitor Charge Off Delay Capacitor Input Pin 10 GSF Pin 4 L CSL zony Pin 7 B2N gt Edge out Non Retrigger Reset Oneshot Capacitor Pin 12LOCD T External Output Control JH CHG Charge Control Output open drain Pin 16 DSG Discharge Control Output totem pole Over_current BD2058T1 eps July 1997 Figure 1 Block Diagram bq2058T Functional Description Figure 1 is a block diagram outlining the major compo nents of the bq2058T Figure 2 shows a low side control connection diagram The following sections detail the various functional aspect
4. the high impedance state and DSG is driven low Any load on the pack terminals will be interpreted as an overcur rent condition by the bq2058T with the overcurrent de lay timer held in reset When the CTL pin is driven low the overcurrent delay timer is allowed to start If the programmed delay tocp is too short the overcurrent recovery circuit if implemented will be unable to cor rect the overcurrent situation prior to the delay time out It is recommended that a delay time of greater than 10ms Cocp 0 01uF be used if the CTL pin function is to be utilized Important note If CTL floats it is internally pulled high making both DSG and CHG inactive thus disabling the pack If CTL is not used it should betied to Vss The polarity of CTL is mask programmable at Bench marq Please contact Benchmarq for other polarity op tions Protection Delay Timers The delay time between the detection of an overcurrent overvoltage or undervoltage condition and the deactiva tion of the CHG and or DSG outputs is user configurable by the selection of capacitor values between Vcc and OCD OVD and UVD pins respectively See Table 2 below The fault condition must persist through the entire de lay period or the bq2058T may not deadivate either FET control output Figure 3 shows a step by step event cycle for the bq2058T Table 2 Protection Delay Timers Protection Delay Capacitor from Typical
5. O0 O0 BQZOS8TR I O BENCHMARQ Features Protects and individually moni tors two Li lon series cells for overvoltage undervoltage Monitors pack for overcurrent Designed for battery pack inte gration Minimal external components Drives external FET switches gt Selectable overvoltage Vov thresholds Mask programmable by Benchmarq Standard version 4 25V gt Supply current 12uA typical gt Sleep current 0 7uA typical gt 16 pin 150 mil narrow SOIC bq2058T Lithium lon Pack Supervisor General Description The bq2058T Lithium lon Pack Su pervisor is designed to control the charge and discharge cell voltage lim its for two lithium ion Li lon series cells accommodating battery packs containing series parallel configura tions The low operating current does not overdischarge the cals during pe riods of storage and does not signifi cantly increase the system discharge load The bq2058T can be part of a low cost Li lon charge control system within the battery pack The bq2058T controls two external FETs to limit the charge and discharge potentials The bq2058T allows charg ing when each individual cell voltage is below Vov overvoltage limit If the voltage on any cell exceeds Voy for a user configurable delay period tovp the open drain CHG pin goes to the high impedance state shutting off For 2 Cell Packs charge to the battery pack This safety feature prevents overchar
6. Tolerance Feature Period Vcc to Capacitor Time Overcurrent tocp OCD 0 010uF 12ms 40 Overvoltage tovD OVD 0 100uF 950ms 40 Undervoltage tuvD UvD 0 100uF 950ms 40 N otes 1 The delay time versus capacitance can be approximated by the following equations For tocp tis 1 2 Cuf where 0 001uF lt C lt 0 1uF Fortovp tuvp ts 9 5 Cuf where 0 0luF lt C lt 1uF 2 Overvoltage and undervoltage conditions are sampled by the bq2058T The delay in Table 2 isin addition to the time required for the bq2058T to detect the violation which may vary from 0 to 120 ms depending on where in the sampling period the violation occurs Overcurrent is continuously monitored and is subject to a delay of approximately 1 5ms July 1997 bq2058T Cell Voltage CSL BATon 160mV Voci BATon 70mV Vcp l l Se i tocD ke tyvD a TLP LF TD2058T1 eps Figure 3 Protector Event Diagram Event Definition 0 The bq2058T is in the low power sleep mode because one or more of the cell voltages are below Vuv 1 A charger is applied to the pack causing the difference between CSL and BAT 2n to become greater than 70mV This awakens the bq2058T and the discharge pin DSG goes high 2 One or more cells charge to a voltage equal to Vov initiating the overvoltage delay timer 3 The overvoltage delay time expires causing CHG to goto high impedance
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9. cell sampling delay which may add up to 120ms of additional delay until the condition is detected July 1997 bq2058T Typical Characteristics bq2058T 4 25V OVERVOLTAGE THRESHOLD vs FREE AIR TEMPERATURE 4 280 4 270 4 260 4 250 4 240 Vov Overvoltage V 4 230 Measurement accuracy 2mV 4 220 4 210 30 20 10 0 10 20 30 40 50 60 70 TA Free Air Temperature C Figure 4 July 1997 10 Data Sheet Revision History bq2058T Change No Page No Description Nature of Change I 5 CHG pin output state CHG pin state at overvoltage and floating battery input was low is now Z 1 9 Overcurrent limits Was Voc 100mV 25mV Is Voci 150mV 25mV 1 9 Charge detect threshold Was 70mV 10mV 80mV Is 70mV 60mv 80mV 2 4 Overvoltage options Table 1 Added bq2058TR 2 4 Figure 2 Corrected schematic Was tocp 10ms 30 tovp 800ms 30 tuvp 800ms 30 2 6 9 Delay thresholds ls tocp 2 12ms 40 tovp 950ms 40 tuvp 950ms 40 2 7 DSG and CHG timing diagram Inverted lines for proper logic levels S Was CSH timing 2 Timing Diagram Is CSL timing 2 8 Maximum input current Added lin Dm 2 9 Vov tolerance a v Was VocH 160mV 25mV 2 9 Overcurrent limits Voc 150mV 25mV Is Voch 160mV 35mV Voci 160mV 35mV Was OV min 18V max 2 9 VoP Is 4V min 9V max Note Change 1 J une 19 1997
10. changes from April 22 1997 Change 2 J uly 1997 changes from J une 19 1997 July 1997 11 bq2058T SN 16 Pin SN 0 150 SOIC 16 Pin SN 0 150 SOIC gt m j E Inches Millimeters D 4 4 Dimension Min Max Min Max e A 0 060 0 070 1 52 1 78 E Al 0 004 0 010 0 10 025 E B 0013 0020 033 O51 C 0 007 0010 018 025 D 0 385 0 400 978 1016 E 0 150 0 160 381 4 06 C A1 e 0 045 0 055 114 1 40 P zm ee e H 0 225 0245 572 622 i A 004 L 0 015 0 035 038 0 89 July 1997 12 Ordering Information bq2058T XXXX L Standard Device Blank Standard device XXXX Customer code assigned by Benchmarq Package Option SN 16 pin narrow SOIC Overvoltage Threshold Blank 4 25V Standard device Contact factory for availability of other thresholds Device bq2058T Lithium lon Pack Supervisor Package Devices TA Voy Threshold 16 pin Narrow SOIC SN 30 C to 4 25V bq2058TSN 70 C 4 35V bq2058TRSN Note bq2058TSN is Standard Device Contact factory for availability of other thresholds and tolerances July 1997 13 bq2058T Notes July 1997 14 Notes July 1997 15 bq2058T BENCHMARQ BENCHMARQ Microelectronics Inc 17919 Waterview Parkway Dalla
11. d 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 Addendum Page 1 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries Tl reserve the right to make corrections modifications enhancements improvements and other changes to its products and services at any time and to discontinue any product or service without notice Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete All products are sold subject to Tl s terms and conditions of sale supplied at the time of order acknowledgment TI warrants performance of its h
12. edance Charging is disabled until a valid charge en able exists See Charge Enable section Important note If any battery pin floats BATip BAT iu BATzy the bq2058T assumes an overvolt age has occurred Because of different manufacturers specifications for overvoltage thresholds the bq2058T can be available with different Voy options Table 1 summarizes these different voltage thresholds July 1997 bq2058T Table 1 Overvoltage Threshold Options Part Vov Limit bq2058T 4 25V bq2058TR 4 35V The overvoltage threshold limits are programmed at Benchmarq The bq2058T is the standard op tion that is more readily available for sampling and prototyping purposes Please contact Bench marq for other voltage threshold and tolerance options Charge Enable A valid charge enable indicates that an overvoltage overcharge condition no longer exists and that the pack is ready to accept further charge Once overvoltage protection is asserted charging will not be enabled un til all cell voltages fall below Vcg The Vce threshold is a function of Voy and changes with different Voy lim its Vcg Vov 150mV Overcurrent The bq2058T detects an overcurrent or short circuit condition only in the discharge direction Overcurrent protection is asserted when either of the conditions oc curs and remain for a time exceeding a user configurable delay tocp CSL BAT2N VocL CSH BAT iP VocH where V
13. ge of any cal within the battery pack After an over voltage condition occurs each call must fall below Vce charge enable voltage for the bq2058T to re enable charging The bq2058T protects batteries from overdischarge If the voltage on any cell falls below Vuy undervoltage limit for a user configurable delay pe riod tuvp the DSG output is driven low shutting off the battery discharge This safety feature prevents overdis charge of any cdl within the battery pack The bq2058T also stops discharge on detection of an overcurrent condition such as a short circuit If an overcur rent condition occurs for a user configurable delay period tocp the DSG output is driven low disconned ing the load from the pack DSG re mains low until removal of the short drit or overcurrent condition Pin Connections DSG Voc UVD OVD OCD Voc CSH BAT4P 16 Pin Narrow SOIC Dn July 1997 Pin Names CHG Charge control output CTL Pack disable input Vss Low potential input CSL Overcurrent sense low side input BATaN Battery 2 negative input BATin Battery negative input DSG Discharge control output UVD Undervoltage delay input OVD Overvoltage delay input OCD Overcurrent delay input Vcc High potential input CSH Overcurrent sense high side input BAT ip Battery positive input bq2058T Pin Descriptions CHG CTL Vss CSL BATon BATin DSG Charge control output Thi
14. igns 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 or Green RoHS amp 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 0 196 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 Green RoHS amp 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 0 196 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 Important Information an
15. oc 160mvV low side detect VocH 160mvV high side detect When either of these conditions occurs DSG is driven low disconnecting the load from the pack DSG remains low until both of the voltage conditions are false indi cating removal of the short circuit condition The user can facilitate dearing these conditions by inserting the battery pack into a charger The high side overcurrent sense can be disabled by con necting CSH to BATip This ensures that CSH is never greater than BATip If high side detection is disabled low side detection must be used with CSL The FETs in the charge discharge path controlled by the CHG and DSG pins affect the overcurrent level The on resistance of these FETs need to be taken into ac count when determining overcurrent levels bq2058T CHG and DSG States TheCHG and DSG output truth tableis shown below Condition CHG pin DSG pin Normal operation High High Overvoltage Z High Undervoltage High Low Overcurrent High Low Floating battery input Z Indeterminate CTL high Z Low The polarities of CHG and DSG are mask programmable at Benchmarq Push pull vs open drain configuration is also mask configurable at Benchmarq Please contact Benchmarqfor availability of these variations Pack Disable Input CTL The CTL pin is used to electrically disconnect the bat tery from the pack terminals through an externally sup plied signal When CTL is taken high CHG goes to
16. re below Vcc Vcc Any pin CHG pin except CHG Vss FG2058lx eps July 1997 DC Electrical Characteristics rA ToPR bq2058T Symbol Parameter Minimum Typical Maximum Unit Conditions Notes Vou Output high voltage Vcc 0 5 V lou 10uA CHG DSG VoL Output low voltage Vss 0 5 V lor 10uA CHG DSG VoP Operating voltage 0 9 0 V Vccrelativeto Vss VIL Input low voltage Vss 0 5 V Pin CTL VIH Input high voltage Vss 2 0 V Pin CTL Icca Active current 12 25 uA lccs Sleep current 0 7 1 5 uA RcELL Input impedance 10 x MQ Pins BAToan BATin and BATip DC Thresholds r4 Topr Symbol Parameter Value Unit Tolerance Conditons 4 25 V See note 1 Vov Overvoltage threshold eli Table 1 Customer option Ver Charge enable threshold Vov 150mV V 55mV Vuv Undervoltage threshold 2 25 V 100mV Overcurrent detect VOCH high side 160 mV 35MV Overcurrent detect VOCL ow side 160 mV 35mV Vcp Charge detect threshold 70 mV 60mV 80mV Covp 0 100uF tovo Overvoltage delay 950 ms 40 TA 30 C threshold See note 2 Cuvp 0 100uF tuvp Undervoltage delay 950 ms 40 Ta 30 C threshold See note 2 Overcurrent delay thresh C 0 01uF tocp old y 12 ms 40 T 30 H Notes 1 Standard device Contact Benchmarq for different thresholds and tolerance options 2 Does not include
17. s Texas 75252 Fax 972 437 9198 Tel 972 437 9195 E mail benchmarq 2 benchmarq com World Wide Web http www benchmarq com Copyright 1997 BENCHMARQ Microelectronics I nc All rights reserved No part of this data sheet may be reproduced in any form or means without express permission from Benchmarq Benchmarq reserves the right to make changes in its products without noti ce Benchmarq assumes no responsibility for use of any products or circuitry described within No license for use of in tellectual property patents copyrights or other rights owned by Benchmarq or other parties is granted or implied Benchmarq does not authorize the use of its components in life support systems where failure or malfunction may cause injury to the user If Benchmarq components are used in life support systems the user assumes all responsi bilities and indemnifies Benchmarq from all liability or damages Benchmarq is a registered trademark of BE NCH MARQ Microelectronics nc Printedin U S A July 1997 16 K Texas PACKAGE OPTION ADDENDUM INSTRUMENTS www ti com 30 Mar 2005 PACKAGING INFORMATION Orderable Device Status Package Package Pins Package Eco Plan Lead Ball Finish MSL Peak Temp Type Drawing Qty BQ2058TRSN C2 OBSOLETE SOIC D 16 TBD Call TI Call TI BQ2058TSN C2 OBSOLETE SOIC D 16 TBD Call TI Call TI The marketing status values are defined as follows ACTIVE Product device recommended for new des
18. s of the bq2058T Thresholds The bq2058T monitors the lithium ion pack for the con ditions listed below Shown with these conditions are the respective thresholds used to determine if that con dition exists m Overvoltage Vov m Undervoltage Vuv m Overcurrent Vocu Voci m ChargeEnable Vcg m Charge Detect Vcp The bq2058T samples a cell every 60ms typical Every sample is a fully differential measurement of each cell During this sample period the bq2058T compares the measurements with these thresholds to determine if any of the these conditions exist Voy Vuv and Vcg Overcurrent and charge detect are conditions that are not sampled but are continuously monitored Initialization On initial power up such as connecting the battery pack for the first time to the bq2058T the bq2058T enters the low power sleep mode disabling the DSG output It is recommended that a top to bottom cell connection be made at pack assembly for proper initializa tion A charging supply must be applied to the bq2058T drcuit to enable the pack See Low Power Sleep Mode and Charge Detect sections lt POS gt BAT1 BAT2 FG2058T1 eps Figure 2 2 Cell Connection Diagram Low Side Control July 1997 Low Power Sleep Mode The bq2058T enters the low power sleep mode in two different ways 1 On initial power up 2 After the detection of an undervoltage condi tion Vuv
19. s open drain output controls the charge path to the battery pack Charging is allowed when high Pack disable input When high this input allows an external source to disable the pack by making both DSG and CHG inactive For normal opera tion the CTL pin is low Low potential input Overcurrent sense low side input This input is connected between the low side discharge FET or sense resistor and BAT 2n to enable overcurrent sensing in the battery pack s ground path Battery 2 negative inputs 3 pins These pins are connected to the negative termi nal of the cell designated BAT2 in Figure 2 Battery 1negative input This input is connected to the negative termi nal of the cell designated BAT1 in Figure 2 Discharge control output This push pull output controls the discharge path to the battery pack Discharge is al lowed when high UVD OVD OCD Vcc CSH BAT p Undervoltage delay input This input uses an external capacitor to Vcc to set theundervoltage delay ti ming Overvoltage delay input This input uses an external capacitor to Vcc to set the overvoltage delay timing Overcurrent delay input This input uses an external capacitor to Vcc to set the overcurrent delay timing High potential inputs 2 pins Overcurrent sense high side input This input is connected between the high side discharge FET or sense resistor and BATip to enable overcurrent sense in the battery pack s positive
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TEXAS INSTRUMENTS bq2058T handbook