Details, datasheet, quote on part number: BQ2040SN-C408TR
PartBQ2040SN-C408TR
CategoryPower Management => Battery Management => Gas Gauges
TitleGas Gauges
Descriptionti BQ2040, Multi-chemistry Smart Battery System (SBS) 1.0 Compliant Gas Gauge With 4 Led Drivers
CompanyTexas Instruments, Inc.
DatasheetDownload BQ2040SN-C408TR datasheet
Quote
Find where to buy
 
  

 

Features, Applications
Features

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 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

 

Related products with the same datasheet
BQ2040SN-D111
BQ2040SN-D111TR
Some Part number from the same manufacture Texas Instruments, Inc.
BQ2040SN-D111 ti BQ2040, Multi-chemistry Smart Battery System (SBS) 1.0 Compliant Gas Gauge With 4 Led Drivers
BQ2050 Lithium Ion Power Gauge(tm) ic
BQ2050H Low-cost Lithium Ion Power Gauge(tm) ic
BQ2050HSN Low-cost Lithium Ion Power Gauge ic
BQ2050HSN-A304TR Low-cost Lithium Ion Power Gauge(tm) ic
BQ2050HSN-A508 ti BQ2050H, Li-ion Gas Gauge With High-speed 1-Wire (HDQ) Interface And 5 Led Drivers
BQ2050SN Low-cost Lithium Ion Power Gauge ic
BQ2050SN-D119 ti BQ2050, Li-ion Gas Gauge With 1-Wire (DQ) Interface And 5 Led Drivers
BQ2050SNN Low-cost Lithium Ion Power Gauge ic
BQ2052 Gas Gauge ic For Lithium Primary Cells
BQ2052SN
BQ2052SN-A515 ti BQ2052, Primary Lithium Gas Gauge W/high-speed 1-Wire (HDQ) Interface, 3 Prgmable Led Patterns
BQ2054 Lithium Ion Fast-charge ic
BQ2054PN ti BQ2054, Li-ion Switchmode Charge Management ic
BQ2056 Low-dropout Li-ion Charge-control Ics With Autocomp(tm) Charge-rate Compensation
BQ2056CSN Advanced Li-ion Linear Charge Management ic
BQ2056PN ti BQ2056, Li-ion Low-dropout Linear Charge Management ic With Autocomptm
BQ2056T Low-dropout Li-ion Charge-control Ics With Autocomp(tm) Charge-rate Compensation
BQ2056TPN ti BQ2056T, Li-ion Low-dropout Linear Charge Management ic With Autocomptm
BQ2056TS Advanced Li-ion Linear Charge Management ic
BQ2056TSN ti BQ2056T, Li-ion Low-dropout Linear Charge Management ic With Autocomptm

5962-9466903QUA : Floating-point Digital Signal Processors, Military

74ACT11139PW : Dual 2-line to 4-line Decoder/demultiplexer

SM320C6201GLE : Digital Signal Processors

SN74ALVC10DGVR : ti SN74ALVC10, Triple 3-Input Positive-nand Gate

TLV2242IDGK : ti TLV2242, Dual Micropower, 2.5-V, Rrio, Single Supply Amplifier

SN75C189ANSRG4 : Quadruple Low-power LINE Receivers

INA169NA/3KG4 : IC, CURRENT SHUNT MONITOR 440KHZ SOT23-5 Specifications: No. of Amplifiers: 1 ; Input Bias Current: 10A ; Output Current Per Channel: - ; Input Offset Voltage: 1mV ; Gain dB Max: - ; Bandwidth: 440kHz ; CMRR: 120dB ; Slew Rate: - ; Supply Voltage Range: 2.7V to 60V ; Supply Current: 60A ; Amplifier Case Style: SOT-23 ; No. of Pins: 5 ; O

SN74LVC2G32MDCUREP : ti SN74LVC2G32, Dual 2-Input Positive-OR GATE

TPS61300YFFT : Pmic - Led Driver Integrated Circuit (ics) Flash/Torch, General Purpose Yes Yes; IC LED FLASH DVR I2C 20DSBGA Specifications: Type - Primary: Flash/Torch, General Purpose ; Type - Secondary: White LED ; Number of Outputs: 3 ; Constant Current: Yes ; Constant Voltage: Yes ; Topology: PWM, Step-Up (Boost) ; Frequency: 1.92MHz ; Lead Free Status: Lead Free ; RoHS Status: RoHS Compliant

MUX36S08EVM-PDK : Switch Development Tools MUX36S08 Evaluation Module Texas Instruments MUX36xxx Low-Leakage-Current Analog Multiplexers are modern complementary metal-oxide semiconductor (CMOS) analog multiplexers (muxes). The MUX36S08 offers 8:1 single-ended channels; whereas, the MUX36D04 offers differential 4:1 (8:2) channels. The MUX36S08 and MUX36D04 work equ

 
0-C     D-L     M-R     S-Z