Details, datasheet, quote on part number: BQ2050SN-D119
CategorySemiconductors => Power Management => Battery Management Products => Battery Fuel Gauge
Part familyBQ2050 Li-Ion Gas Gauge With 1-Wire (DQ) Interface And 5 LED Drivers
TitleGas Gauges
DescriptionLi-Ion Gas Gauge With 1-Wire (DQ) Interface And 5 LED Drivers 16-SOIC 0 to 70
CompanyTexas Instruments, Inc.
DatasheetDownload BQ2050SN-D119 datasheet
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  Mecanical Data
Pin nbPackage typeInd stdJEDEC codePackage qtyCarrierDevice markWidth (mm)Length (mm)Thick (mm)Pitch (mm)
16DSOICR-PDSO-G40TUBE2050 3.919.91.581.27
Application notes
• Using the bq2050 to Monitor Lead-Acid Batteries | Doc


Features, Applications

Conservative and repeatable measurement of available capacity in Lithium Ion rechargeable batteries Designed for battery pack integration

The bq2050 Lithium Ion Power GaugeTM IC is intended for batterypack or in-system installation to maintain an accurate record of available battery capacity. The IC monitors a voltage drop across a sense resistor connected in series between the negative battery termina ou charge and discharge activity of the battery. Compensations for battery temperature and rate of charge or discharge are applied to the charge, discharge, and self-discharge calculations to provide available capacity information across a wide range of operating conditions. Battery capacity is automatically recalibrated, or "learned," in the course of a discharge cycle from full to empty. Nominal available capacity may be directly indicated using a fivesegment LED display. These segments are used to graphically indicate available capacity. The bq2050

supports a simple single-line bidirectional serial link to an external processor (common ground). The bq2050 outputs battery information in response to external commands over the serial link. The bq2050 may operate directly from one cell (VBAT > 3V). With the REF output and an external transistor, a simple, inexpensive regulator can be built for systems with more than one series cell. Internal registers include available capacity, temperature, scaled available energy, battery ID, battery status, and programming pin settings. To support subassembly testing, the outputs may also be controlled. The external processor may also overwrite some of the bq2050 power gauge data registers.

120µ A typical operating current Small size enables implementations in as little 1 2 square inch of PCB

Display capacity via singlewire serial communication port or direct drive of LEDs

Measurements compensated for current and temperature Self-discharge compensation using internal temperature sensor 16-pin narrow SOIC

LCOM LED common output LED segment 1/ program 1 input LED segment 2/ program 2 input RBI SEG3/PROG3 LED segment 3/ program 3 input LED segment 4/ program 4 input LED segment 5/ program 5 input Program 6 input SB DISP SEG5/PROG5 PROG6 VCC VSS REF N/C DQ SEG2/PROG2 Voltage reference output No connect Serial communications input/output Register backup input Battery sense input Display control input Sense resistor input 3.0­6.5V System ground

LCOM LED common output Open-drain output switches VCC to source current for the LEDs. The switch is off during initialization to allow reading of the soft pull-up or pull-down program resistors. LCOM is also high impedance when the display is off. SEG1­ SEG5 LED display segment outputs (dual function with PROG1­PROG6) Each output may activate an LED to sink the current sourced from LCOM. PROG1­ PROG2 Programmed full count selection inputs (dual function with SEG1­SEG2) These three-level input pins define the programmed full count (PFC) thresholds described in Table PROG3­ PROG4 Power gauge rate selection inputs (dual function with SEG3­SEG4) These three-level input pins define the scale factor described in Table 2. PROG5 Self-discharge rate selection (dual function with SEG5) This three-level input pin defines the selfdischarge and battery compensation factors as shown in Table 1. PROG6 Capacity initialization selection This three-level pin defines the battery state of charge at reset as shown in Table 1. N/C No connect DQ RBI SB DISP SR Sense resistor input The voltage drop (VSR) across the sense resistor RS is monitored and integrated over time to interpret charge and discharge activity. The SR input is tied between the negative terminal of the battery and the sense resistor. VSR < VSS indicates discharge, and VSR > VSS indicates charge. The effective voltage drop, VSRO, as seen by the bq2050 is VSR + VOS. Display control input DISP high disables the LED display. DISP tied to VCC allows PROGX to connect directly to VCC or VSS instead of through a pull-up or pull-down resistor. DISP floating allows the LED display to be active during charge. DISP low activates the display. See Table 1. Secondary battery input This input monitors the battery cell voltage potential through a high-impedance resistive divider network for end-of-discharge voltage (EDV) thresholds, and battery removed. Register backup input This pin is used to provide backup potential to the bq2050 registers during periods when VCC 3V. A storage capacitor or a battery can be connected to RBI. Serial I/O pin This is an open-drain bidirectional pin. REF Voltage reference output for regulator REF provides a voltage reference output for an optional micro-regulator. VCC VSS Supply voltage input Ground

The bq2050 determines battery capacity by monitoring the amount of current input to or removed from a rechargeable battery. The bq2050 measures discharge and charge currents, measures battery voltage, estimates self-discharge, monitors the battery for low battery voltage thresholds, and compensates for temperature and charge/discharge rates. The current measurement is made by monitoring the voltage across a small-value series sense resistor between the negative battery terminal and ground. The estimate of scaled available energy is made using the remaining average battery voltage during the discharge cycle and the remaining nominal available charge. The scaled available energy measurement is corrected for the environmental and operating conditions. Figure 1 shows a typical battery pack application of the bq2050 using the LED display capability as a chargestate indicator. The bq2050 is configured to display capacity in relative display mode. The relative display mode uses the last measured discharge capacity of the battery as the battery "full" reference. A push-button display feature is available for momentarily enabling the LED display. The bq2050 monitors the charge and discharge currents as a voltage across a sense resistor (see RS in Figure 1). A filter between the negative battery terminal and the SR pin may be required if the rate of change of the battery current is too great.

Indicates optional. Directly connect to VCC across 1 cell (VBAT > 3V). Otherwise, R1, C1, and Q1 are needed for regulation > 1 cell. Programming resistors (6 max.) and ESD-protection diodes are not shown. R-C on SR may be required, application-specific. A series Zener may be used to limit discharge current at low voltages in designs using 3 or more cells.

Figure 1. Battery Pack Application Diagram--LED Display


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