Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - battery management Charge indicator LiCoO2 DSBGA 15 (2.61x1.96) Surface-mount

Single Cell Li- Ion

Battery Pack

PACK -

PROTECTION

CHG

DSG

To Charger

Current

Sense

I2C

PACK +

Voltage

Sense

FETs

System

Interface

VCC

DATA

LDO

GPOUT

REGIN

VBAT

VSS

BIN

bq27425

SRX

Integrated

bq27425-G1

www.ti.com

SLUSAI6 –NOVEMBER 2011

System-Side Impedance Track™ Fuel Gauge With Integrated

Sense Resistor

FEATURES

APPLICATIONS

• Battery Fuel Gauge for 1-Series LiCoO

battery

• Feature Phones

Applications

• Smart Phones

• Easy to Configure Battery Fuel Gauging Based

• PDAs

on Patented Impedance Track™ Technology

• Digital Still and Video Cameras

– Models Battery Discharge Curve for

• Handheld Terminals

Accurate State-of-Charge Report

• MP3 or Multimedia Players

– Automatically Adjusts for Battery Aging,

Battery Self-Discharge, and

DESCRIPTION

Temperature/Rate Inefficiencies

The Texas Instruments bq27425 system-side LiCoO

– Low-Value Integrated Sense Resistor

battery fuel gauge is an easy to configure

(10 mΩ typical)

microcontroller peripheral that provides fuel gauging

for single-cell LiCoO

battery packs. The device

• Resides on System Main Board

requires minimal user configurations and system

– Works with Embedded or Removable

microcontroller firmware development for accurate

Battery Packs

fuel gauging.

– Integrated LDO allows devices to be

The bq27425 uses the patented Impedance Track™

powered directly from battery pack

algorithm for fuel gauging, and provides information

• Microcontroller Peripheral Provides:

such as remaining battery capacity (mAh),

state-of-charge (%), and battery voltage (mV).

– Accurate Battery Fuel Gauging

– Internal Temperature Sensor for Battery

Battery fuel gauging with the bq27425 requires only

Temperature Reporting

PACK+ (P+), PACK– (P–), for a removable battery

pack or embedded battery circuit. The 15-pin 2,69 ×

– Configurable Level of State-of-Charge

1,75 mm, 0.5 mm pitch CSP package is ideal for

(SOC) Interrupts

space constrained applications.

• I

C™ for Connection to System

Microcontroller Port

• Small 15-pin 2,69 × 1,75 mm, 0.5 mm pitch

CSP package

TYPICAL APPLICATION

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 data sheet.

2Impedance Track is a trademark of Texas Instruments.

C is a trademark of Phillips Corporation.

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.

Summary of content (32 pages)

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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com 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.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com ELECTRICAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range (unless otherwise noted) (1) VALUE UNIT VREGIN Regulator input range PARAMETER –0.3 to 5.5 V VCC Supply voltage range –0.3 to 2.75 V VIOD Open-drain I/O pins (SDA, SCL) –0.3 to 5.5 V VBAT BAT input pin –0.3 to 5.5 VI Input voltage range to all other pins (SRX , GPOUT) TA Tstg (1) –0.3 to VCC + 0.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com RECOMMENDED OPERATING CONDITIONS (continued) TA = 25°C and VREGIN = VBAT = 3.6V (unless otherwise noted) PARAMETER Ilkg Input leakage current (I/O pins) tPUCD Power-up communication delay TEST CONDITIONS MIN TYP MAX 0.3 250 UNIT μA ms POWER-ON RESET TA = –40°C to 85°C, typical values at TA = 25°C and VREGIN = 3.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com INTERNAL TEMPERATURE SENSOR CHARACTERISTICS TA = –40°C to 85°C; typical values at TA = 25°C and VREGIN = 3.6 V (unless otherwise noted) PARAMETER GTEMP TEST CONDITIONS MIN TYP MAX UNIT –2 Temperature sensor voltage gain mV/°C INTEGRATING ADC (COULOMB COUNTER) CHARACTERISTICS TA = –40°C to 85°C; typical values at TA = 25°C and VREGIN = 3.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com EEPROM MEMORY CHARACTERISTICS TA = –40°C to 85°C; typical values at TA = 25°C and VREGIN = 3.6 V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP Array Size 256 Data retention (1) Programming write cycles (1) (1) MAX UNIT Bytes 10 Years 100K Cycles Specified by design. Not production tested I2C-COMPATIBLE INTERFACE COMMUNICATION TIMING CHARACTERISTICS TA = –40°C to 85°C; typical values at TA = 25°C and VREGIN = 3.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com GENERAL DESCRIPTION The bq27425 accurately predicts the battery capacity and other operational characteristics of a single LiCoO2 rechargeable cell. It can be interrogated by a system processor to provide cell information, such as state-of-charge (SOC). Information is accessed through a series of commands, called Standard Commands. Further capabilities are provided by the additional Extended Commands set.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com DATA COMMANDS Standard Data Commands The bq27425 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 1. Because each command consists of two bytes of data, two consecutive I2C transmissions must be executed both to initiate the command function, and to read or write the corresponding two bytes of data.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com 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 bq27425 during normal operation and additional features when the bq27425 is in different access modes, as described in Table 2. Table 2.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com CONTROL_STATUS: 0x0000 Instructs the fuel gauge to return status information to control addresses 0x00/0x01. The status word includes the following information. Table 3. CONTROL_STATUS Bit Definitions bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 High Byte RSVD RSVD SS CALMODE CCA BCA QMAX_UP RES_UP Low Byte RSVD HIBERNATE RSVD SLEEP LDMD RUP_DIS VOK RSVD RSVD = Reserved. SS = Status bit indicating the bq27425 is in the SEALED State.
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bq27425-G1 www.ti.com SLUSAI6 – NOVEMBER 2011 SET_HIBERNATE: 0x0011 Instructs the fuel 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. CLEAR_HIBERNATE: 0x0012 Instructs the fuel gauge to force the CONTROL_STATUS[HIBERNATE] and [HIBE] bit to 0.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com Temperature( ): 0x02/0x03 This read-/write-word function returns an unsigned integer value of the temperature in units of 0.1 K measured by the fuel gauge. If [TEMPS] bit = 1, a write command sets the temperature to be used for gauging calculations while a read command returns to temperature previously written. If [TEMPS] bit = 0, a read command will return the internal temperature sensor value and write command will be ignored.
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bq27425-G1 www.ti.com SLUSAI6 – NOVEMBER 2011 NominalAvailableCapacity( ): 0x08/0x09 This read-only command pair returns the uncompensated (less than C/20 load) battery capacity remaining. Units are mAh. FullAvailableCapacity( ): 0x0a/0x0b This read-only command pair returns the uncompensated (less than C/20 load) capacity of the battery when fully charged. Units are mAh. FullAvailableCapacity( ) is updated at regular intervals, as specified by the IT algorithm.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com StateofHealth( ): 0x20/0x21 0x20 SOH percentage: this read-only function returns an unsigned integer value, expressed as a percentage of the ratio of predicted FCC(25°C, SOH LoadI) over the DesignCapacity(). The FCC(25°C, SOH LoadI) is the calculated full charge capacity at 25°C and the SOH LoadI which is programmed in factory (default = –400mA). The range of the returned SOH percentage is 0x00 to 0x64, indicating 0 to 100% correspondingly.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com Extended Data Commands Extended commands offer additional functionality beyond the standard set of commands. They are used in the same manner; however unlike standard commands, extended commands are not limited to 2-byte words. The number of command bytes for a given extended command ranges in size from single to multiple bytes, as specified in Table 5. Table 5.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com BlockDataChecksum( ): 0x60 UNSEALED Access: This byte contains the checksum on the 32 bytes of block data read or written. The least-significant byte of the sum of the data bytes written must be complemented ( [255 – x] , for x the least-significant byte) before being written to 0x60. SEALED Access: This byte contains the checksum for the 32 bytes of block data written to Manufacturer Info Block.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com Occasionally, a data CLASS will be larger than the 32-byte block size. In this case, the DataBlock( ) command is used to designate which 32-byte block the desired locations reside in. The correct command address is then given by 0x40 + offset modulo 32. For example, to access Terminate Voltage in the Gas Gauging class, DataClass( ) is issued 80 (0x50) to set the class. Because the offset is 48, it must reside in the second 32-byte block.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com BLOCK DATA SUMMARY Table 7 summarizes the data blocks available to the user, including their default, minimum, and maximum values. Table 7. Block Data Summary Class Configuration [RAM] SubClass ID SubClass Offset 2 Safety [RAM] 0 Over Temp 2 4 36 49 68 Charge Termination [RAM] Discharge [RAM] Power [RAM] Name Data Type Min Max Default Unit (EVSW Unit) I2 -1200 1200 550 0.1°C Under Temp I2 -1200 1200 0 0.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com Table 7. Block Data Summary (continued) Class Calibration [NVM] Security [RAM] SubClass ID SubClass Offset 104 Data [NVM] 0 CC Delta F4 2.98E+04 1.19E+06 567744.5 68 4 CC Offset U2 0 65535 –1200 num (mV) 6 Board Offset I1 –128 127 0 num (uV) 7 Int Temp Offset I1 –128 127 0 num (°C) 8 Pack V Offset I1 –128 127 0 num (mV) 0 CC Gain F4 1.00E-01 4.00E+01 0.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com DETAILED PIN DESCRIPTIONS The Operation Configuration Register Two bq27425 pins are configured via the Operation Configuration data NVM register, as indicated in Table 8. This register is programmed/read via the methods described in Section Accessing the Data NVM. Table 8.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com Table 9. SOC_INT Function Definition SOCI_Delta Enable Condition Pulse Width Description SOCI_Delta ≠ 0 1ms During charge, when the StateOfCharge() reaches greater than or equal to (≥) the defined SOC_INT intervals. The intervals are defined as 100% and 100% – n × SOCI_Delta. During discharge, when the StateOfCharge() reaches less than (<) the defined SOC_INT intervals. The intervals are defined as 0% and 100% – n × SOCI_Delta.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com DETECTING CHARGE TERMINATION The bq27425 detects charge termination when (1) during 2 consecutive periods of Current Taper Window (default = 40 seconds), the AverageCurrent( ) is < Taper Current (default = 100 mA), (2) during the same periods, the accumulated change in capacity > 0.25mAh/ / Current Taper Window (default = 40 seconds), and (3) Voltage( ) > (Charging Voltage – 100mV) where Charging Voltage = 4200mV by default.
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bq27425-G1 www.ti.com SLUSAI6 – NOVEMBER 2011 POR and INITIALIZATION Modes Upon Power On Reset (POR), the fuel gauge copies ROM-based configuration defaults to RAM and begins INITIALIZATION mode where essential data is initialized and will remain in INITIALIZATION mode as halted-CPU state when an adapter, or other power source is present to power the bq27425 (and system), yet no battery has been detected.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com I2C INTERFACE The bq27425 supports the standard I2C read, incremental read, quick read, one byte write, and incremental 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 address will therefore be 0xAA or 0xAB for write or read, respectively.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.com I2C Command Waiting Time To make sure the correct results of a command with the 400KHz I2C operation, a proper waiting time should be added between issuing command and reading results. For Subcommands, the following diagram shows, as an example, the 66 µs waiting time required between issuing the control command and reading the status data. Similarly, a 100 ms waiting time is required between the BlockDataChecksum( ) Extended command.
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bq27425-G1 SLUSAI6 – NOVEMBER 2011 www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 29-Jan-2014 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) BQ27425YZFR-G1 DSBGA YZF 15 3000 180.0 8.4 BQ27425YZFT-G1 DSBGA YZF 15 250 180.0 8.4 Pack Materials-Page 1 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 2.0 2.8 0.7 4.0 8.0 Q1 2.0 2.8 0.7 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 29-Jan-2014 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) BQ27425YZFR-G1 DSBGA YZF 15 3000 182.0 182.0 17.0 BQ27425YZFT-G1 DSBGA YZF 15 250 182.0 182.0 17.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.