BQ27505YZGR-J2

Manufacturer Part NumberBQ27505YZGR-J2
DescriptionIC LI-ION FUEL GAUGE 12DSBGA
ManufacturerTexas Instruments
SeriesImpedance Track™
BQ27505YZGR-J2 datasheet
 


Specifications of BQ27505YZGR-J2

FunctionFuel, Gas Gauge/MonitorBattery TypeLithium-Ion (Li-Ion)
Voltage - Supply2.4 V ~ 2.6 VOperating Temperature-40°C ~ 85°C
Mounting TypeSurface MountPackage / Case12-UFBGA, WLCSP
ProductFuel GaugesOperating Supply Voltage2.5 V
Maximum Operating Temperature+ 85 CMinimum Operating Temperature- 40 C
Mounting StyleSMD/SMTLead Free Status / RoHS StatusLead free / RoHS Compliant
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1 INTRODUCTION
1.1 FEATURES
Battery Fuel Gauge for 1-Series Li-Ion
Applications
Resides on System Main Board
– Works With Embedded or Removable
Battery Packs
Uses PACK+, PACK–, and T Battery Terminals
Microcontroller Peripheral Provides:
– Accurate Battery Fuel Gauging
– Internal Temperature Sensor for Battery
Temperature Reporting
– Battery Low Interrupt Warning
– Battery Insertion Indicator
– Configurable Level of State of Charge
(SOC) Interrupts
– State of Health Indicator
– 96 Bytes of Non-Volatile Scratch-Pad
FLASH
Battery Fuel Gauge Based on Patented
Impedance Track™ Technology
– Models the Battery Discharge Curve for
Accurate Time-to-Empty Predictions
– Automatically Adjusts for Battery Aging,
Battery Self-Discharge, and
Temperature/Rate Inefficiencies
– Low-Value Sense Resistor (10 m
2
400-kHz I
C™ Interface for Connection to
System Microcontroller Port
In a 12-Pin NanoFree™ (CSP) Packaging
Power
Management
Controller
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this document.
Impedance Track, NanoFree are trademarks of Texas Instruments.
2
I
C is a trademark of Philips Electronics.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
System-Side Impedance Track™ Fuel Gauge
1.2
APPLICATIONS
Smartphones
PDAs
Digital Still and Video Cameras
Handheld Terminals
MP3 or Multimedia Players
1.3
DESCRIPTION
The Texas Instruments bq27505 system-side Li-Ion
battery fuel gauge is a microcontroller peripheral that
provides fuel gauging for single-cell Li-Ion battery
packs.
The
microcontroller firmware development. The bq27505
resides on the system’s main board and manages an
embedded battery (non-removable) or a removable
battery pack.
The bq27505 uses the patented Impedance Track™
algorithm for fuel gauging, and provides information
such
as
remaining
state-of-charge (%), run-time to empty (min), battery
voltage (mV), temperature ( C) and state of health
(%).
Battery fuel gauging with the bq27505 requires only
or Less)
PACK+ (P+), PACK– (P–), and Thermistor (T)
connections
to
embedded battery circuit. The CSP option is a 12-ball
package in the dimensions of 2,43 mm
with 0,5 mm lead pitch. It is ideal for space
constrained applications.
TYPICAL APPLICATION
Host System
LDO
VCC
Voltage
PACK+
Sense
Battery
Low
Temp
I2C
DATA
Sense
T
bq27505
PACK-
BAT_GD
Current
Sense
SOC _INT
bq27505-J2
SLUS924 – APRIL 2009
device
requires
little
system
battery
capacity
(mAh),
a
removable
battery
pack
or
1,96 mm
Single Cell Li-lon
Battery Pack
PROTECTION
IC
CHG
FETs
DSG
Copyright © 2009, Texas Instruments Incorporated

BQ27505YZGR-J2 Summary of contents

  • Page 1

    ... Management Controller Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this document. Impedance Track, NanoFree are trademarks of Texas Instruments trademark of Philips Electronics. PRODUCTION DATA information is current as of publication date. ...

  • Page 2

    System-Side Impedance Track™ Fuel Gauge SLUS924 – APRIL 2009 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 ...

  • Page 3

    ... DEVICE INFORMATION 2.1 AVAILABLE OPTIONS FIRMWARE PART NUMBER VERSION bq27505YZGR-J2 2.15 bq27505YZGT-J2 (1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com. 2.2 DISSIPATION RATINGS PACKAGE THERMAL YZG = 89 C/W JA (1) Measured with high-K board ...

  • Page 4

    System-Side Impedance Track™ Fuel Gauge SLUS924 – APRIL 2009 2.1 PIN ASSIGNMENT CSP-12 (TOP VIEW TERMINAL (1) TYPE NAME NO. Analog input pin connected to the internal coulomb counter where ...

  • Page 5

    ELECTRICAL SPECIFICATIONS 3.1 ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range (unless otherwise noted) PARAMETER V Supply voltage range CC V Open-drain I/O pins (SDA, SCL, SOC_INT) IOD V BAT input pin BAT V Input voltage range to ...

  • Page 6

    System-Side Impedance Track™ Fuel Gauge SLUS924 – APRIL 2009 3.3 POWER-ON RESET T = – typical values PARAMETER V Positive-going battery voltage input at V IT+ V Power-on reset hysteresis HYS 3.4 ...

  • Page 7

    ADC (TEMPERATURE AND CELL MEASUREMENT) CHARACTERISTICS T = – 2.4 V < V < 2.6 V; typical values PARAMETER V Input voltage range IN(ADC) t Conversion time ADC_CONV Resolution V ...

  • Page 8

    System-Side Impedance Track™ Fuel Gauge SLUS924 – APRIL 2009 2 3.10 I C-COMPATIBLE INTERFACE COMMUNICATION TIMING CHARACTERISTICS T = – 2.4 V < V < 2.6 V; typical values PARAMETER t ...

  • Page 9

    GENERAL DESCRIPTION The bq27505 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 time-to-empty (TTE), time-to-full (TTF) and ...

  • Page 10

    System-Side Impedance Track™ Fuel Gauge SLUS924 – APRIL 2009 4.1 DATA COMMANDS 4.1.1 STANDARD DATA COMMANDS The bq27505 uses a series of 2-byte standard commands to enable system reading and writing of battery information. Each standard command has an ...

  • Page 11

    Control( ): 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 bq27505 during normal ...

  • Page 12

    System-Side Impedance Track™ Fuel Gauge SLUS924 – APRIL 2009 4.1.1.1.1 CONTROL_STATUS: 0x0000 Instructs the fuel gauge to return status information to control addresses 0x00/0x01. The status word includes the following information. Table 4-3. CONTROL_STATUS Bit Definitions bit7 bit6 High ...

  • Page 13

    CC_INT_OFFSET: 0X000A Control data of 0x000a instructs the fuel gauge to compute the coulomb counter offset with internal short applied across the SR inputs. The offset value is returned to addresses 0x00/0x01, after a delay of approximately 16 ...

  • Page 14

    System-Side Impedance Track™ Fuel Gauge SLUS924 – APRIL 2009 4.1.1.1.20 IT_DISABLE: 0x0023 This command disables the fuel gauge the Impedance Track™ algorithm, clears the IT Enable to 0x00 and causes the [QEN] flags to be cleared in the CONTROL_STATUS ...

  • Page 15

    Flags( ): 0x0a/0x0b This read-word function returns the contents of the fuel-gauge status register, depicting the current operating status. bit7 bit6 High byte OTC OTD Low byte – – OTC = Overtemperature in charge condition is detected. True ...

  • Page 16

    System-Side Impedance Track™ Fuel Gauge SLUS924 – APRIL 2009 4.1.1.14 StandbyCurrent( ): 0x1a/0x1b This read-only function returns a signed integer value of the measured standby current through the sense resistor. The StandbyCurrent adaptive measurement. Initially it ...

  • Page 17

    StateofHealth( ): 0x28/0x29 0x28 SOH percentage: this read-only function returns an unsigned integer value, expressed as a percentage of the ration of predicted FCC(25 C, SOH LoadI) over the DesignCapacity(). The FCC(25 C, SOH LoadI) is the calculated ...

  • Page 18

    System-Side Impedance Track™ Fuel Gauge SLUS924 – APRIL 2009 Table 4-5. Extended Data Commands (continued) NAME DeviceNameLength( ) DeviceName( ) ApplicationStatus( ) Reserved 4.1.2.1 DesignCapacity( ): 0x3c/0x3d SEALED and UNSEALED Access: This command returns the value is stored in ...

  • Page 19

    DeviceName( ): 0x63 0x69 UNSEALED and SEALED Access: This block contains the device name that is programmed in Device Name. 4.1.2.9 ApplicationStatus( ): 0x6a This byte function allows the system to read the bq27505 Application Status data flash ...

  • Page 20

    System-Side Impedance Track™ Fuel Gauge SLUS924 – APRIL 2009 4.3 MANUFACTURER INFORMATION BLOCKS The bq27505 contains 96 bytes of user programmable data flash storage: Manufacturer Info Block A, and Manufacturer Info Block B. The method for accessing these memory ...

  • Page 21

    ACCESS MODES The bq27505 provides three security modes (FULL ACCESS, UNSEALED, and SEALED) that control data flash access permissions, according to specified in Table 4-7, that are accessible to the user. Manufacture Information refers to the three 32-byte ...

  • Page 22

    System-Side Impedance Track™ Fuel Gauge SLUS924 – APRIL 2009 Table 4-7. Data Flash Summary (continued) Subclass Class Subclass ID Configuration 34 Charge Configuration 34 Charge Charge Configuration 36 Termination Charge Configuration 36 Termination Charge Configuration 36 Termination Charge Configuration ...

  • Page 23

    Table 4-7. Data Flash Summary (continued) Subclass Class Subclass ID Gas Gauging 80 IT Cfg Gas Gauging 80 IT Cfg Gas Gauging 80 IT Cfg Gas Gauging 80 IT Cfg Current Gas Gauging 81 Thresholds Current Gas Gauging 81 ...

  • Page 24

    System-Side Impedance Track™ Fuel Gauge SLUS924 – APRIL 2009 The total battery capacity is found by comparing states of charge before and after applying the load with the amount of charge passed. When an application load is applied, the ...

  • Page 25

    If Load Mode = 1 (Constant Power) then the following options shown in Table 5-2. Constant-Power Model Used When Load Mode = 1 LoadSelect Value Average discharge power from previous cycle: There is an internal register that records the ...

  • Page 26

    System-Side Impedance Track™ Fuel Gauge SLUS924 – APRIL 2009 5.2.8 Qmax 0 and Qmax 1 Generically called Qmax, these dynamic variables contain the respective maximum chemical capacity of the active cell profiles, and are determined by comparing states of ...

  • Page 27

    Table 5-3. Operation Configuration Bit Definition bit7 bit6 High byte RESCAP BATG_OVR Low byte INT_FOCV IDSELEN RESCAP = No-load rate of compensation is applied to the reserve capacity calculation. True when set. Default is 0. BATG_OVR = BAT_GD override ...

  • Page 28

    System-Side Impedance Track™ Fuel Gauge SLUS924 – APRIL 2009 5.3.3 BAT_LOW Pin The BAT_LOW pin provides a system processor with an electrical indicator of battery status. The signaling on the BAT_LOW pin follows the status of the [SOC1] bit ...

  • Page 29

    Figure 5-1 details how the BAT_GD pin functions in the context of battery insertion and removal, as well as NORMAL vs. SLEEP modes. In PFC 1, the BAT_GD pin is also used to disable battery charging when the bq27505 ...

  • Page 30

    System-Side Impedance Track™ Fuel Gauge SLUS924 – APRIL 2009 5.4 TEMPERATURE MEASUREMENT The bq27505 measures battery temperature via its TS input, in order to supply battery temperature status information to the fuel gauging algorithm and charger-control sections of the ...

  • Page 31

    The charging should not start when the temperature is below the Charge Inhibit Temp Low or above the Charge Inhibit Temp High. The charging can continue if the charging starts inside the window [Charge Inhibit Temp Low, Charge Inhibit ...

  • Page 32

    System-Side Impedance Track™ Fuel Gauge SLUS924 – APRIL 2009 5.7.4 SLEEP+ MODE Compared to the SLEEP mode, SLEEP+ mode has the high frequency oscillator in operation. The communication delay could be eliminated. The SLEEP+ is entered automatically if the ...

  • Page 33

    RSNS1 (1) The actual resistance value vs the setting of the sense resistor is not important, just the actual voltage threshold when calculating the configuration. The votage thresholds are typical values ...

  • Page 34

    System-Side Impedance Track™ Fuel Gauge SLUS924 – APRIL 2009 6.1.2 Activities Upon Pack Insertion 6.1.2.1 First OCV and Impedance Measurement At power-up the BAT_GD pin is inactive, so that the system might not obtain power from the battery (this ...

  • Page 35

    COMMUNICATIONS 2 7 INTERFACE The 27505 supports the standard I write functions. The 7 bit device address (ADDR) is the most significant 7 bits of the hex address and is fixed as 1010101. The 8-bit device ...

  • Page 36

    System-Side Impedance Track™ Fuel Gauge SLUS924 – APRIL 2009 2 7 Time Out 2 The I C engine will release both SDA and SCL if the I Timeout times 0.5 second. If the bq27505 was holding the ...

  • Page 37

    REFERENCE SCHEMATICS 8.1 SCHEMATIC Submit Documentation Feedback System-Side Impedance Track™ Fuel Gauge SLUS924 – APRIL 2009 REFERENCE SCHEMATICS bq27505-J2 37 ...

  • Page 38

    ... PACKAGING INFORMATION Orderable Device (1) Package Type Package Status BQ27505YZGR-J2 NRND DSBGA BQ27505YZGT-J2 NRND DSBGA (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. ...

  • Page 39

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing BQ27505YZGR-J2 DSBGA YZG BQ27505YZGT-J2 DSBGA YZG PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 12 3000 180.0 8.4 2.1 12 250 180.0 8.4 2.1 Pack Materials-Page 1 ...

  • Page 40

    ... Device Package Type BQ27505YZGR-J2 DSBGA BQ27505YZGT-J2 DSBGA PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm) YZG 12 3000 YZG 12 250 Pack Materials-Page 2 20-Jul-2010 Width (mm) Height (mm) 190.5 212.7 31.8 190.5 212.7 31.8 ...

  • Page 41

    X: Max = 2480 mm, Min = 2379 mm Y: Max = 2006 mm, Min = 1906 mm ...

  • Page 42

    ... 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 and should verify that such information is current and complete. All products are sold subject to TI’ ...