Details, datasheet, quote on part number: BQ2081
CategoryPower Management => Battery Management => Battery Monitoring => Monitor/Supervisory
DescriptionSBS Compliant Gas Gauge ic For Use With The Bq29311
CompanyInternational Components Corp.
DatasheetDownload BQ2081 datasheet
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Features, Applications

Charge in Li-Ion and Li-Polymer Batteries Supports the Smart Battery Specification (SBS) V1.1 Works With the TI bq29311 Protection IC to Provide Complete Pack Electronics for or 14.4-V Battery Packs with Few External Components Based on a Powerful Low-Power RISC CPU Core With High-Performance Peripherals Integrated FLASH Memory Eliminates the Need for External Configuration EEPROM Measures Charge Flow Using a High Resolution 15­Bit Integrating Converter ­ Better Than 3-nVh of Resolution ­ Self-Calibrating ­ Offset Error Less Than 1-µV Uses 15-Bit Delta Sigma Converter for Accurate Voltage, Temperature, and Current Measurements Programmable Cell Modeling for Maximum Battery Fuel Gauge Accuracy Drives or 5-Segment LED Display for Remaining Capacity Indication 38­pin TSSOP (DBT) The bq2081 uses an integrating converter with continuous sampling for the measurement of battery charge and discharge currents. Optimized for coloumb 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-µV (typical). For voltage, temperature, and current reporting, the bq2081 uses a 15-bit A-to-D converter. In conjunction with the bq29311, the onboard ADC also monitors individual cell voltages in a battery pack and allows the bq2081 to generate the control signals necessary to implement the required safety protection for Li-Ion and Li-Polymer battery chemistries. The bq2081 supports the smart battery data (SBData) commands and charge control functions. It communicates data using the System Management Bus (SMBus) 2-wire protocol or the 1-wire HDQ16 protocol. The data available includes the battery's remaining capacity, temperature, voltage, current, and remaining run-time predictions. The bq2081 provides LED drivers and a push button input to depict remaining battery capacity from full to empty or 25% increments with or 5 segment display. The bq2081 contains 512 bytes of internal FLASH EPROM, whith store configuration information. The information includes nominal capacity and voltage, self­discharge rate, rate compensation factors, and other programmable cell­modeling factors used to accurately adjust remaining capacity for use­conditions based on time, rate, and temperature. The bq2081 also automatically calibrates or learns the true battery capacity in the course of a discharge cycle from programmable near full to near empty levels. The bq29311 protection IC provides power to the bq2081 from or 4 series Li-Ion cell stack, eliminating the need for an external regulator circuit.


The bq2081 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 bq2081 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 bq29311 protection IC to maximize functionality and safety and minimize component count and cost in smart battery circuits.

PRODUCT PREVIEW information concerns products in the formative or design phase of development. Characteristic data and other specifications are design goals. Texas Instruments reserves the right to change or discontinue these products without notice.

TERMINAL NAME CLKOUT DISP FILT HDQ16 INT LED4 LED5 MRST N/C No. I/O I I/O Master reset input that forces the device into reset when held high No connection Analog input for auto ADC offset compensation. Register backup that provides backup potential to the bq2081 registers during periods of low operating voltage. RBI accepts a storage capacitor or a battery input. Communication clock to the bq29311 Data transfer to and from bq29311 SMBus clock open-drain bidirectional pin used to clock the data transfer to and from the bq2081 SMBus data open-drain bidirectional pin used to transfer address and data to and from the bq2081 Connections for a small-value sense resistor to monitor the battery y chargeg and discharge-current g flow Thermistor voltage input connection to monitor temperature Positive supply for analog circuitry Positive supply for digital circuitry and I/O pins Single cell voltage input from the bq29311 Negative supply for analog circuitry Negative supply for digital circuitry Negative supply for output circuitry 32.768kHz crystal oscillator input pin 32.768kHz crystal oscillator output pin 32.768-kHz output to the bq29311 Display control for the LED drivers LED1 through LED5 Serial memory clock for data transfer between the bq2063 and the external nonvolatile configuration memory Serial communication open-drain bidirectional communications port Safety interrupt from the bq2081 LED display y segments g that each may y drive an external LED DESCRIPTION

absolute maximum ratings over operating free-air temperature (unless otherwise noted)

Supply voltage range, VDD relative to VSS (see Note 6 V Open-drain I/O pins, V(IOD) relative to VSS (see Note 6 V Input voltage range to all other pins, VI relative to VSS (see Note V to VDD + 0.3V Operating free-air temperature range, TA. to 70°C Storage temperature range, Tstg. to 150°C

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. NOTE: 1: VSS refers to the common node of V(SSA), V(SSD), and VSS.

PARAMETER VDD IDD I(SLP) VI(OLS) V(IL) VIH VOL V(ILS) V(IHS) V(AI) I(RB) V(RBI) Z(AI1) Z(AI2) Supply voltage Operating current Low-power storage mode current Output voltage low: (LED1­LED5) Input voltage low DISP Input voltage high DISP Output voltage low SMBC, SMBD, HDQ16, SDATA, SCLK Input voltage low SMBC, SMBD, HDQ16, SDATA, SCLK Input voltage high SMBC, SMBD, HDQ16, SDATA, SCLK Input voltage range VIN, TS, OC RBI data-retention input current RBI data-retention voltage Input impedance SR1, SR2 Input impedance VIN, TS, V­1.0 V V(RBI) 3 V, VCC 10 8 IOL ­0.3 1.7 VSS 0.3 10 I(OLS) ­0.3 2 TEST CONDITIONS MIN 3.0 TYP VCC MAX 3.6 UNIT V M

PARAMETER V(SR) V(SROS) INL TEST CONDITIONS MIN TYP MAX 1.0 UNIT V µV Input voltage range, V(SR2) and VSR ­ V(SR1) Input offset Integral nonlinearity error


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