Instruction/ maintenance manual of the product bq27500 Texas Instruments
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www.ti.com 1 INTRODUCTION 1.1 FEATURES 1.2 APPLICATIONS 1.3 DESCRIPTION HostSystem SingleCellLi-Ion BatteryPack P ACK- PROTECTION IC CHG DSG T emp Sense Battery Good Current Sense I2C T LD.
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.
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.
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.
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.
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.
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 SPECIFIC.
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.
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.
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.
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.
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.
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.
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.
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) ACC.
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 .
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 .
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.
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.
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 Ma.
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.
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.
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.
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).
www.ti.com Start Init (“BA T_GD” disabled , OCV taken , “BA T _GD enabled .) End NoBattPresent -OR- badbatt ( “BA T _GD” disabled ) BattPresent SLEEP NORMAL Y es BatteryV olt .
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.
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.
www.ti.com ExitFromSLEEP | AverageCurrent () | > SleepCurrent OR CurrentisDetectedaboveI WAKE EntryT oHIBERNA TE Hosthasset ControlStatus [ HIBERNA TE ]=1 .
www.ti.com 5.8 POWER CONTROL 5.8.1 RESET FUNCTIONS Store checksum ActiveRAM changed? GenerateNew checksumvalue YES NO Generate Active RAMchecksum value DotheChecksum V aluesMat.
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.
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.
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.
www.ti.com 7 COMMUNICATIONS 7.1 I 2 C INTERFACE (a)1-bytewrite (b)quickread (c)1-byteread (d)incrementalread (S=Start,Sr=RepeatedStart, A = Acknowledge,N=No Acknowledge,andP =Stop).
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.
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 B.
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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.
An important point after buying a device Texas Instruments bq27500 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
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