|Category||Communication => Telephony => Line Interface|
|Description||Gas Gauge ic With Smbus Interface|
|Company||Texas Instruments, Inc.|
|Datasheet||Download BQ2040SN datasheet
® Provides accurate measurement of available charge in NiCd, NiMH, and Li-Ion batteries ® Supports SBS v1.0 data set and two-wire interface ® Monitors charge FET in Li-Ion pack protection circuit ® Designed for battery pack integration
The bq2040 Gas Gauge IC With SMBus Interface is intended for battery-pack or in-system installation to maintain an accurate record of available battery charge. The bq2040 directly supports capacity monitoring for NiCd, NiMH, and LiIon battery chemistries. The bq2040 uses the System Management Bus v1.0 (SMBus) protocol and supports the Smart Battery Data (SBData) commands. The bq2040 also supports the SBData charge control functions. Battery state-of-charge, remaining capacity, remaining time, and chemistry are ri k. Battery-charge state can be directly indicated using a four-segment LED display to graphically depict battery full-to-empty in 25% increments.
The bq2040 estimates battery selfdischarge based on an internal timer and temperature sensor and user-programmable rate information stored in external EEPROM. The bq2040 also automatically recalibrates or "learns" battery capacity in the full course of a discharge cycle from full to empty. The bq2040 may operate directly from three nickel chemistry cells. With the REF output and an external transistor, a simple, inexpensive regulator can be built to provide VCC for other battery cell configurations. An external EEPROM is used to program initial values into the bq2040 and is necessary for proper operation.Low operating current Complete circuit can fit on less than ¾ square inch of PCB space
® Supports SBS charge control commands for NiCd, NiMH, and Li-Ion ® Drives a four-segment LED display for remaining capacity indication ® 16-pin narrow SOIC
VCC 3.06.5V EEPROM clock EEPROM data LED segment 1-4 System ground Sense resistor input Display control input SB Battery sense input ESCL ESDA LED1-4 VSS SR DISP PSTAT Protector status input SMBD SMBC REF VOUT SMBus data input/output SMBus clock Voltage reference output EEPROM supply output
VCC ESCL Supply voltage input Serial memory clock Output used to clock the data transfer between the bq2040 and the external nonvolatile configuration memory. ESDA Serial memory data and address Bidirectional pin used to transfer address and data to and from the bq2040 and the external nonvolitile configuration memory. LED1 LED4 VSS SR LED display segment outputs Each output may drive an external LED. Ground Sense resistor input The voltage drop (VSR) across pins SR and VSS is monitored and integrated over time to interpret charge and discharge activity. The SR input is connected to the sense resistor and the negative terminal of the battery. VSR < VSS indicates discharge, and VSR > VSS indicates charge. The effective voltage drop, VSRO, as seen by the bq2040 is VSR + VOS. (See Table 3.) SMBD PSTAT DISP Display control input DISP high disables the LED display. DISP floating allows the LED display to be active during charge if the rate is greater than 100mA. DISP low activates the display for 4 seconds. SB Secondary battery input Monitors the pack voltage through a highimpedance resistor divider network. The pack voltage is reported in the SBD register function Voltage (0x09) and is monitored for end-of-discharge voltage and charging voltage parameters. Protector status input Provides overvoltage status from the Li-Ion protector circuit and can initiate a charge suspend request. SMBus data Open-drain bidirectional pin used to transfer address and data to and from the bq2040. SMBC SMBus clock Open-drain bidirectional pin used to clock the data transfer to and from the bq2040. REF Reference output for regulator REF provides a reference output for an optional FET-based micro-regulator. VOUT Supply output Supplies power to the external EEPROM configuration memory.
The bq2040 determines battery capacity by monitoring the amount of charge put into or removed from a rechargeable battery. The bq2040 measures discharge and charge currents, estimates self-discharge, and monitors the battery for low-battery voltage thresholds. The charge is measured by monitoring the voltage across a small-value series sense resistor between the battery's negative terminal and ground. The available battery charge is determined by monitoring this voltage over time and correcting the measurement for the environmental and operating conditions. Figure 1 shows a typical battery pack application of the bq2040 using the LED capacity display, the serial port, and an external EEPROM for battery pack programming information. The bq2040 must be configured and calibrated for the battery-specific information to ensure proper operation. Table 1 outlines the configuration information that must be programmed in the EEPROM. An internal temperature sensor eliminates the need for an external thermistor--reducing cost and components. An internal, temperature-compensated timebase eliminates the need for an external resonator, further reducing cost and components. The entire circuit in Figure 1 can occupy less than 3 4 square inch of board space.VCC ESCL ESDA LED3 LED4 VSS VOUT REF SMBC SMBD PSTAT SB DISP SR
Figure 1. Battery Pack Application Diagram--LED Display
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