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Texas Instruments bq27500 manual

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Table of contents for the manual

  • Page 1

    www.ti.com 1 INTRODUCTION 1.1 FEATURES 1.2 APPLICATIONS 1.3 DESCRIPTION HostSystem SingleCellLi-Ion BatteryPack P ACK- PROTECTION IC CHG DSG T emp Sense Battery Good Current Sense I2C T LDO P ACK+ V oltage Sense Battery Low Warning FET s bq 27500 / 1 RID RID Sense* *bq27501Only Power Management Controller bq27500 bq27501 System-Si[...]

  • Page 2

    www.ti.com Contents bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. 1 INTRODUCTION ........................[...]

  • Page 3

    www.ti.com 2 DEVICE INFORMATION 2.1 AVAILABLE OPTIONS 2.2 PIN DIAGRAMS BA T V SS SRN SRP V CC BA T_GD SDA SCL 1 2 3 4 5 6 12 1 1 10 9 8 7 BA T_LOW _ TS 1 2 3 4 5 6 12 1 1 10 9 8 7 BI/TOUT BA T V SS V CC BA T_LOW _ TS BI/TOUT NC SRN SRP BA T_GD SDA SCL RID bq27500 bq27501 2.3 TERMINAL FUNCTIONS bq27500 bq27501 System-Side Impedance Track™ Fuel Gau[...]

  • Page 4

    www.ti.com 3 ELECTRICAL SPECIFICATIONS 3.1 ABSOLUTE MAXIMUM RATINGS 3.2 RECOMMENDED OPERATING CONDITIONS 3.3 POWER-ON RESET bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 over operating free-air temperature range (unless otherwise noted) (1) PARAMETER VALUE UNIT V CC Supply voltage range –0.3 to 2.75 V V IOD [...]

  • Page 5

    www.ti.com 3.4 INTERNAL TEMPERATURE SENSOR CHARACTERISTICS 3.5 HIGH FREQUENCY OSCILLATOR 3.6 LOW FREQUENCY OSCILLATOR 3.7 INTEGRATING ADC (COULOMB COUNTER) CHARACTERISTICS 3.8 ADC (TEMPERATURE AND CELL MEASUREMENT) CHARACTERISTICS bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 T A = –40 ° C to 85 ° C, 2.4 V[...]

  • Page 6

    www.ti.com 3.9 DATA FLASH MEMORY CHARACTERISTICS 3.10 I 2 C-COMPATIBLE INTERFACE COMMUNICATION TIMING CHARACTERISTICS bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 ADC (TEMPERATURE AND CELL MEASUREMENT) CHARACTERISTICS (continued) T A = –40 ° C to 85 ° C, 2.4 V < V CC < 2.6 V; Typical Values at T A =[...]

  • Page 7

    www.ti.com bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 Figure 3-1. I 2 C-Compatible Interface Timing Diagrams Submit Documentation Feedback ELECTRICAL SPECIFICATIONS 7[...]

  • Page 8

    www.ti.com 4 GENERAL DESCRIPTION bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 The bq27500/1 accurately predicts the battery capacity and other operational characteristics of a single Li-based rechargeable cell. It can be interrogated by a system processor to provide cell information, such as State-of-Charge ([...]

  • Page 9

    www.ti.com 4.1 DATA COMMANDS 4.1.1 STANDARD DATA COMMANDS bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 The bq27500/1 uses a series of 2-byte standard commands to enable system reading and writing of battery information. Each standard command has an associated command-code pair, as indicated in Table 4-1 . Bec[...]

  • Page 10

    www.ti.com bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 4.1.1.1 Control( ): 0x00/0x01 Issuing a Control( ) command requires a subsequent two-byte sub-command. These additional bytes specify the particular control function desired. The Control( ) command allows the system to control specific features of the bq[...]

  • Page 11

    www.ti.com bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 4.1.1.1.3 FW_VERSION: 0x0002 Instructs the fuel gauge to return the firmware version to addresses 0x00/0x01. 4.1.1.1.4 HW_VERSION: 0x0003 Instructs the fuel gauge to return the hardware version to addresses 0x00/0x01. 4.1.1.1.5 RESET_DATA: 0x0005 Instruc[...]

  • Page 12

    www.ti.com bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 4.1.1.1.15 CAL MODE: 0x0040 This command instructs the fuel gauge to enter calibration mode. This command is only available when the fuel gauge is UNSEALED. 4.1.1.1.16 RESET: 0x0041 This command instructs the fuel gauge to perform a full reset. This comm[...]

  • Page 13

    www.ti.com bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 4.1.1.7 NominalAvailableCapacity( ): 0x0c/0x0d This read-only command pair returns the uncompensated (no or light load) battery capacity remaining. Units are mAh per bit. 4.1.1.8 FullAvailableCapacity( ): 0x0e/0x0f This read-only command pair returns the[...]

  • Page 14

    www.ti.com 4.1.2 EXTENDED DATA COMMANDS bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 4.1.1.16 MaxLoadCurrent( ): 0x1e/0x1f This read-only function returns a signed integer value, in units of mA, of the maximum load conditions. The MaxLoadCurrent( ) is an adaptive measurement which is initially reported as the[...]

  • Page 15

    www.ti.com bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 Table 4-5. Extended Data Commands (continued) COMMAND SEALED UNSEALED NAME UNITS CODE ACCESS (1) (2) ACCESS (1) (2) BlockData( ) DFD 0x55 … 0x5f N/A R R/W BlockDataCheckSum( ) DFDCKS 0x60 N/A R/W R/W BlockDataControl( ) DFDCNTL 0x61 N/A N/A R/W DeviceN[...]

  • Page 16

    www.ti.com 4.2 DATA FLASH INTERFACE 4.2.1 ACCESSING THE DATA FLASH bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 4.1.2.7 DeviceNameLength( ): 0x62 UNSEALED and SEALED Access: This byte contains the length of the Device Name . 4.1.2.8 DeviceName( ): 0x63 … 0x69 UNSEALED and SEALED Access: This block contains [...]

  • Page 17

    www.ti.com 4.3 MANUFACTURER INFORMATION BLOCKS 4.4 ACCESS MODES 4.5 SEALING/UNSEALING DATA FLASH bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 The bq27350 contains 96 bytes of user programmable data flash storage: Manufacturer Info Block A , Manufacturer Info Block B , Manufacturer Info Block C . The method fo[...]

  • Page 18

    www.ti.com 4.6 DATA FLASH SUMMARY bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 Both the sets of keys for each level are 2 bytes each in length and are stored in data flash. The UNSEAL key (stored at Unseal Key 0 and Unseal Key 1 ) and the FULL-ACCESS key (stored at Full Access Key 0 and Full Access Key 1 ) ca[...]

  • Page 19

    www.ti.com bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 Table 4-7. Data Flash Summary (continued) Subclass Data Min Max Default Class Subclass Offset Name Units ID Type Value Value Value Configuration 64 Registers 0 Operation Configuration H2 0x0000 0xffff 0x0979 – Configuration 64 Registers 2 Pack 0 Voltag[...]

  • Page 20

    www.ti.com 5 FUNCTIONAL DESCRIPTION 5.1 FUEL GAUGING bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 Table 4-7. Data Flash Summary (continued) Subclass Data Min Max Default Class Subclass Offset Name Units ID Type Value Value Value Ra Tables 91 Pack0 Ra 0-18 Ra Tables 92 Pack1 Ra 0-18 See Note (2) Ra Tables 93 P[...]

  • Page 21

    www.ti.com 5.2 IMPEDANCE TRACK™ VARIABLES bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 The bq27500/1 has several data flash variables that permit the user to customize the Impedance Track™ algorithm for optimized performance. These variables are dependent upon the power characteristics of the application [...]

  • Page 22

    www.ti.com bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 Dsg Current Threshold This register is used as a threshold by many functions in the bq27350 to determine if actual discharge current is flowing into or out of the cell. The default for this register is 100mA which should be sufficient for most applicatio[...]

  • Page 23

    www.ti.com 5.3 DETAILED DESCRIPTION OF DEDICATED PINS 5.3.1 The Operation Configuration Register 5.3.2 Pin Function Code Descriptions 5.3.3 BAT_LOW Pin 5.3.4 Power Path Control with the BAT_GD Pin bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 Some bq27500/1 pins are configured via the Operation Configuration d[...]

  • Page 24

    www.ti.com 5.3.5 Battery Detection Using the BI/TOUT Pin bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 for the fuel gauge to take an accurate OCV reading. To disable these functions, the BAT_GD pin is merely set high (floating output pulled high). Once an OCV reading has be made, the BAT_GD pin is pulled low ,[...]

  • Page 25

    www.ti.com Start Init (“BA T_GD” disabled , OCV taken , “BA T _GD enabled .) End NoBattPresent -OR- badbatt ( “BA T _GD” disabled ) BattPresent SLEEP NORMAL Y es BatteryV olt Sufficient toFG ? No Y es Batt removed ? No Y es Batt detected ? No Bq 27500 POR Batt detected ? No Y es ACorUSB Present ? Y es No IT Operati[...]

  • Page 26

    www.ti.com 5.4 TEMPERATURE MEASUREMENT 5.5 OVERTEMPERATURE INDICATION 5.5.1 Overtemperature: Charge 5.5.2 Overtemperature: Discharge 5.6 CHARGING AND CHARGE-TERMINATION INDICATION 5.6.1 Detecting Charge Termination 5.6.2 Charge Inhibit bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 The bq27500/1 measures batter[...]

  • Page 27

    www.ti.com 5.7 POWER MODES 5.7.1 NORMAL MODE 5.7.2 SLEEP MODE 5.7.3 BAT INSERT CHECK MODE bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 The bq27500/1 has four power modes: NORMAL, SLEEP, HIBERNATE, and BAT INSERT CHECK. In NORMAL mode, the bq27500/1 is fully powered and can execute any allowable task. In SLEEP[...]

  • Page 28

    www.ti.com ExitFromSLEEP | AverageCurrent () | > SleepCurrent OR CurrentisDetectedaboveI WAKE EntryT oHIBERNA TE Hosthasset ControlStatus [ HIBERNA TE ]=1 OR V CELL < HibernateVoltage Fuel gauginganddata updatedevery 1s , I CC = Normal NORMAL Fuel gauginganddata updated every60[...]

  • Page 29

    www.ti.com 5.8 POWER CONTROL 5.8.1 RESET FUNCTIONS Store checksum ActiveRAM changed? GenerateNew checksumvalue YES NO Generate Active RAMchecksum value DotheChecksum V aluesMatch? - Re initializeall RAM NO YES DEVICERESET Stored checksum NORMAL OPERA TION bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS78[...]

  • Page 30

    www.ti.com 5.8.2 WAKE-UP COMPARATOR 5.8.3 FLASH UPDATES 5.9 AUTOCALIBRATION bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 The wake up comparator is used to indicate a change in cell current while the bq27500/1 is in either SLEEP or HIBERNATE modes. Operation Configuration uses bits [RSNS1-RSNS0] to set the sen[...]

  • Page 31

    www.ti.com 6 APPLICATION-SPECIFIC INFORMATION 6.1 BATTERY PROFILE STORAGE AND SELECTION 6.1.1 General Profile Description 6.1.2 Activities Upon Pack Insertion 6.2 APPLICATION-SPECIFIC FLOW AND CONTROL 6.2.1 Simple Battery (bq27500 Only) bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 When a battery pack is remov[...]

  • Page 32

    www.ti.com 6.2.2 Battery With Resistor ID (bq27501 Only) bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 impedance is measured immediately after battery detection. The bq27500 chooses the profile which is closest to the measured impedance, starting with the Packn Ra profiles. That is, if the measured impedance m[...]

  • Page 33

    www.ti.com 7 COMMUNICATIONS 7.1 I 2 C INTERFACE (a)1-bytewrite (b)quickread (c)1-byteread (d)incrementalread (S=Start,Sr=RepeatedStart, A = Acknowledge,N=No Acknowledge,andP =Stop). FuelGaugeGenerated Hostgenerated bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 [...]

  • Page 34

    www.ti.com 8 REFERENCE SCHEMATICS 8.1 SCHEMATIC bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge SLUS785 – SEPTEMBER 2007 REFERENCE SCHEMATICS 34 Submit Documentation Feedback[...]

  • Page 35

    PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3) BQ27500DRZR ACTIVE SON DRZ 12 3000 TBD Call TI Call TI BQ27500DRZT ACTIVE SON DRZ 12 250 TBD Call TI Call TI (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for ne[...]

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    IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) 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[...]