|Category||Power Management => Battery Management => Gas Gauges|
|Description||ti BQ2084, SBS Compliant Gas Gauge For Use With The Bq29312|
|Company||Texas Instruments, Inc.|
|Datasheet||Download BQ2084DBT datasheet
The bq2084 SBS-compliant gas gauge IC for battery pack or in-system installation maintains an accurate record of available charge in Li-ion or Li-polymer batteries. The bq2084 monitors capacity and other critical parameters of the battery pack and reports the information to the system host controller over a serial communication bus. It is designed to work with the bq29312 analog front-end (AFE) protection IC to maximize functionality and safety and minimize component count and cost in smart battery circuits. Using information from the bq2084, the host controller can manage remaining battery power to extend the system run time as much as possible. The bq2084 uses an integrating converter with continuous sampling for the measurement of battery charge and discharge currents. Optimized for coulomb counting in portable applications, the self-calibrating integrating converter has a resolution better than 3-nVh and an offset measurement error of less than 1-mV (typical). For voltage and temperature reporting, the bq2084 uses a 16-bit A-to-D converter. In conjunction with the bq29312, the onboard ADC also monitors the pack and individual cell voltages in a battery pack and allows the bq2084 to generate the control signals necessary to implement the cell balancing and the required safety protection for Li-ion and Li-polymer battery chemistries. The bq2084 supports the Smart Battery Data (SBData) commands and charge-control functions. It communicates data using the System Management Bus (SMBus) 2-wire protocol. The data available include the battery's remaining capacity, temperature, voltage, current and remaining run-time predictions. The bq2084 provides LED drivers and a push-button input to depict remaining battery capacity from full to empty or 33% increments with or 5-segment display.External Crystal with Optional Crystal input
(AFE) Protection IC to Provide Complete Pack Electronics for or 14.4-V Battery Packs With Few External Components
Resolution 16-Bit Integrating Converter - Better Than 0.65-nVh of Resolution - Self-Calibrating - Offset Error Less Than 1-µV
D 38-Pin TSSOP (DBT) APPLICATIONS D Notebook PCs D Medical and Test Equipment D Portable Instrumentation
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.
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
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.
The bq2084 contains 1k bytes of internal data flash memory, which store configuration information. The information includes nominal capacity and voltage, self-discharge rate, rate compensation factors, and other programmable cell-modeling factors used to accurately adjust remaining capacity for use-conditions based on time, rate, and temperature. The bq2084 also automatically calibrates or learns the true battery capacity in the course of a discharge cycle from programmable near full to near empty levels. bq29312 analog front-end (AFE) protection IC is used to maximize functionality and safety and minimize component count and cost in smart battery circuits. The bq29312 AFE protection IC provides power to the bq2084 from or 4 series Li-ion cell stack, eliminating the need for an external regulator circuit.
PACKAGE 85°C (1) The bq2084 is available taped and reeled. Add an R suffix to the device type (e.g., bq2084DBTR) to order tape and reel version. 38-PIN TSSOP (DBT) bq2084DBT
over operating free-air temperature range unless otherwise noted(1) UNIT Supply voltage range, VDD relative to VSS (see Note 2) Open-drain I/O pins, V(IOD) relative to VSS (see Note 2) Input voltage range to all other pins, VI relative to VSs (see Note 2) Operating free-air temperature range, TA Storage temperature range, Tstg V to VDD to 150°C
(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. (2) VSS refers to the common node of V(SSA), V(SSD), and V(SSP).
VDD to 85°C unless otherwise noted PARAMETER VDD IDD I(SLP) VOL Supply voltage Operating mode current Low-power storage mode current Output voltage low SMBC, SMBD, SDATA, SCLK, SAFE, PU LED1LED5 VIL Input voltage low SMBC, SMBD, SDATA, SCLK, EVENT, PU, PRES, PFIN DISP VIH Z(AI1) Z(AI2) VIT+ Vhys Input voltage high SMBC, SMBD, SDATA, SCLK, EVENT, PU, PRES, PFIN DISP Input voltage range VIN, TS Input voltage range SR1, SR2 Input impedance SR1, SR2 Input impedance VIN, TS Negative-going voltage input Power-on reset hysteresis POWER ON RESET BEHAVIOR vs FREE-AIR-TEMPERATURETEST CONDITIONS VDDA and VDDD No flash programming or LEDs active Sleep mode IOL 0.5 mA IOL 10 mA
VDD to 85°C unless otherwise noted PARAMETER V(SR) V(SROS) INL Input voltage range, V(SR2) and V(SR1) Input offset Integral nonlinearity error FAST 0.8 x Vref TEST CONDITIONS VSR V(SR1) MIN TYP MAX 0.25 UNIT V mVVDD to 85°C unless otherwise noted PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t(SP) Start-up time (see Note 1) ±0.5% frequency error ms (1) The frequency error is measured from the trimmed frequency of the internal system clock, which 128 x oscillator frequency, nominally 4.194 MHz. 3
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