Details, datasheet, quote on part number: BQ2050HSN-A304TR
PartBQ2050HSN-A304TR
CategoryAnalog & Mixed-Signal Processing => Power
TitlePower
DescriptionLow-cost Lithium Ion Power Gauge(tm) ic
CompanyTexas Instruments, Inc.
DatasheetDownload BQ2050HSN-A304TR datasheet
  

 

Features, Applications
Features

Accurate measurement of available capacity in Lithium Ion batteries Provides a low-cost battery management solution for pack integration

The bq2050H 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, self discharge, and rate of discharge are applied to the charge counter 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 seg-

ments are used to graphically indic ila e bq2050H also supports a simple single-line bidirectional serial link to an external processor (common ground). The 5kb HDQ bus interface reduces communications overhead in the external microcontroller. Internal registers include available capacity, temperature, scaled available energy, battery ID, battery status, and Li-Ion charge FET status. The external processor may also overwrite some of the bq2050H power gauge data registers. The bq2050H can operate from the batteries in the pack. The REF output and an external transistor allow a simple, inexpensive voltage regulator to supply power to the circuit from the cells.

Complete circuit can fit in as little 1 2 square inch of PCB Low operating current (120µA typical) Less than 100nA of data retention current

High-speed (5kb) single-wire communication interface (HDQ bus) for critical battery parameters Monitors and controls charge FET in Li-Ion pack protection circuit Direct drive of remaining capacity LEDs Measurements automatically compensated for rate and temperature 16-pin narrow SOIC

LCOM LED common output VSS SR DISP SB RBI HDQ PSTAT REF VCC System ground Sense resistor input Display control input Battery sense input Register backup input Serial communications input/output Protector status input Voltage reference output Supply voltage SEG1/PROG1 LED segment 1/ program 1 input SEG2/PROG2 LED segment 2/ program 2 input SEG3/PROG3 LED segment 3/ program 3 input SEG4/PROG4 LED segment 4/ program 4 input SEG5/PROG5 LED segment 5/ program 5 input CFC Charge FET control output

DISP LCOM LED common output This open-drain output switches CC 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 PROG1­PROG5) 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 scale 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 self-discharge and battery compensation factors as shown in Table 1. CFC Charge FET control output This pin can be used as an additional control to the charge FET of the Li-Ion pack protection circuitry. VSS SR Ground 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 bq2050H is VSR + VOS. VCC REF HDQ RBI SB 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 detection. Register backup input This pin is used to provide backup potential to the bq2050H registers during periods when VCC 3V. A storage capacitor or a battery can be connected to RBI. Serial communication input/output This is the open-drain bidirectional communications port. PSTAT Protector status input This input provides overvoltage status from the Li-Ion protector circuit. It should connect to VSS when not used. Voltage reference output for regulator REF provides a voltage reference output for an optional micro-regulator. Supply voltage input Display control input

The bq2050H determines battery capacity by monitoring the amount of current input to or removed from a rechargeable battery. The bq2050H measures discharge and charge currents, measures battery voltage, estimates self-discharge, monitors the battery for low battery-voltage thresholds, and compensates for temperature and discharge rate. Current measurement is measured by monitoring the voltage across a small-value series sense resistor between the negative battery terminal and ground. Scaled available energy is estimated using the remaining average battery voltage during the discharge cycle and the remaining nominal available capacity. The scaled available energy measurement is corrected for environmental and operating conditions. Figure 1 shows a typical battery pack application of the bq2050H using the LED display capability as a chargestate indicator. The bq2050H 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 bq2050H 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 is required.

R1 bq2050H Power Gauge IC REF C1 LCOM SEG4/PROG4 SEG5/PROG5 CFC VSS RBI PSTAT HDQ See note 4 DISP 0.1µF RS VCC SB VCC RB2 RB1

2. Programming resistors and ESD-protection diodes are not shown. SR is required. 4. A series diode is required on RBI if the bottom series cell is used as the backup source. If the cell is used, the backup capacitor is not required, and the anode is connected to the positive terminal of the cell.

Figure 1. Battery Pack Application Diagram--LED Display

 

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