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Texas Instruments BQ2040SN-D111
- Part No.:
- BQ2040SN-D111
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
BQ2040SN-D111.pdf
- Description:
- IC BATTERY GAS GAUGE 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,359
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Product details
Overview
BQ2040SN-D111 from Texas Instruments is a Smart Battery System (SBS) v1.0–compliant gas gauge IC designed for NiCd, NiMH, and Li-Ion battery pack integration. It delivers accurate remaining capacity, state-of-charge, and remaining time via SMBus interface, supports four-segment LED display output, operates from 3.0–6.5 V, and integrates an internal temperature sensor and timebase. It is used in portable computing, medical handhelds, and industrial battery packs requiring precise fuel gauging.
For engineers reviewing the BQ2040SN-D111 datasheet, BQ2040SN-D111 pinout, BQ2040SN-D111 application, or BQ2040SN-D111 equivalent, key selection criteria include SMBus protocol compliance, LED segment drive capability, EEPROM-based calibration support, self-discharge estimation with temperature compensation, and dual-chemistry charge control (Li-Ion taper + Ni-based ∆T/∆t).
Technical Context
The BQ2040SN-D111 implements coulomb counting using a precision current-sense amplifier monitoring voltage across an external sense resistor (SR–VSS), with ±75 µV typical offset and programmable digital magnitude filter (VSRD threshold). It embeds a temperature-compensated integrator and internal timer to estimate self-discharge at rates configurable from 0–25%/day (20–30°C).
Its SMBus v1.0 interface supports SBS data commands (e.g., RemainingCapacity at 0x0A, Voltage at 0x09) and charge control broadcasts (ChargingCurrent, ChargingVoltage) every 10 seconds. It executes Li-Ion charge termination via current taper detection (≤128 mV below ChargingVoltage, < programmed taper current for ≥100 s) and Ni-based termination via ∆T/∆t with user-programmable step (1.6–4.6°C) and hold-off timer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0–6.5 V - powers directly from 3-cell Ni-based packs or regulated Li-Ion systems |
| Interface Protocol | SMBus v1.0 - enables plug-and-play integration with SBS-compliant smart chargers and hosts |
| Current Sensing Accuracy | ±1% INL (±4% max) - ensures reliable capacity tracking across temperature and voltage ranges |
| LED Outputs | 4 independent open-drain segments - drives discrete LEDs for 25% incremental capacity visualization |
| Self-Discharge Estimation | Programmable 0–25%/day at 20–30°C - adapts decay rate per temperature and chemistry |
| Charge Termination | Li-Ion: current taper; Ni-based: ∆T/∆t - provides chemistry-specific, safe end-of-charge detection |
| Temperature Sensing | Integrated sensor - eliminates external thermistor, reducing BOM cost and layout complexity |
Pinout & Package
Package: 16-pin narrow SOIC (SO-16N), 3.9 mm × 9.9 mm, surface-mount, JEDEC MS-012AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 3.0–6.5 V; powers internal circuitry and VOUT/REF outputs |
| VSS | System ground | Single-point return for SR, SMBus, and LED drivers to minimize noise coupling |
| SR | Sense resistor input | Monitors differential voltage across external sense resistor; integrated for coulomb counting |
| SMBD / SMBC | SMBus data/clock | Open-drain bidirectional lines; require external pull-ups for SBS communication |
| ESDA / ESCL | EEPROM data/clock | Bidirectional serial interface to external configuration EEPROM (e.g., 24C02) |
| LED1–LED4 | LED segment drivers | Open-drain outputs; each sinks current to illuminate one 25% capacity segment |
| DISP | Display control | High = disable; floating = auto-enable on ≥100 mA charge; low = 4-second forced activation |
| SB | Battery voltage sense | High-impedance input for resistor-divider network; monitors pack voltage for EDV/charging alarms |
| PSTAT | Protector status input | ≥1.5 V triggers charge suspension - interfaces directly with Li-Ion protection ICs |
| REF | Voltage reference output | Stable reference for external FET-based microregulator (e.g., BSS138 + R11) |
| VOUT | EEPROM supply output | Provides regulated power to external EEPROM; eliminates need for separate LDO |
Key Features
| Feature | Design Value |
|---|---|
| Smart Battery System v1.0 Compliance | Full support for SBS data set (e.g., RemainingCapacity, Voltage, Temperature) and charge control broadcast commands |
| Chemistry-Agnostic Fuel Gauging | Accurate capacity tracking for NiCd, NiMH, and Li-Ion via adaptive charge/discharge integration and self-discharge modeling |
| On-Chip Temperature Compensation | Internal sensor eliminates thermistor; enables real-time correction of charge efficiency and self-discharge rate |
| Four-Segment LED Interface | Dedicated open-drain outputs simplify visual SOC indication without MCU intervention or external drivers |
| EEPROM-Based Calibration | External EEPROM stores 100+ configuration parameters (e.g., DesignCapacity, EDV thresholds, taper current) for pack-specific tuning |
| Microregulator Enablement | REF output + VOUT enable low-cost, low-quiescent-current regulation for multi-cell Li-Ion or high-voltage Ni packs |
Applications
| Portable Medical Devices | Laptop Battery Packs |
|---|---|
Use Scenario: Rechargeable battery pack in handheld ultrasound or infusion pump requiring runtime prediction and low-battery warning. IC Role / Device Role / Timing Role: Primary gas gauge IC performing real-time coulomb counting, self-discharge estimation, and SMBus reporting of RemainingCapacity and TimeToEmpty. Use Value: Enables accurate "minutes remaining" display and prevents unexpected shutdown during critical procedures via programmable RemainingCapacityAlarm and EDVF thresholds. | Use Scenario: Integrated smart battery module for OEM laptop platforms with SBS host controller. IC Role / Device Role / Timing Role: SBS-compliant fuel gauge providing standardized SMBus register access (0x0A–0x0F) and charge control broadcast to embedded charger IC. Use Value: Delivers drop-in compatibility with Windows ACPI battery class drivers and enables dynamic charge rate adjustment based on temperature and SOC. |
| Industrial Handheld Scanners | Two-Way Radio Battery Packs |
Use Scenario: Ruggedized barcode scanner operating in variable-temperature warehouses with frequent partial charge cycles. IC Role / Device Role / Timing Role: Adaptive capacity estimator that recalibrates FullChargeCapacity after full discharge and compensates for self-discharge during storage. Use Value: Maintains >95% SOC accuracy over 500+ cycles by updating FCC from Discharge Count Register and applying temperature-compensated self-discharge rate. | Use Scenario: Mission-critical two-way radio battery with LED fuel gauge and overvoltage/overtemperature protection. IC Role / Device Role / Timing Role: Dual-role IC providing both visual capacity indication (LED1–LED4) and hardware-level charge suspension via PSTAT input and Over_Temp_Alarm. Use Value: Ensures safety compliance by halting charge when PSTAT ≥1.5 V (e.g., protector IC fault) or battery temperature exceeds programmed limit, with automatic recovery on fault clearance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2060A | Enhanced SBS v1.1 support, integrated EEPROM, higher accuracy (±0.5% INL), 20-pin TSSOP | Eliminates external EEPROM; suited for new designs prioritizing calibration integrity and smaller footprint | Select BQ2060A when board space allows TSSOP and EEPROM integration reduces BOM count and programming steps. |
| BQ2084 | Supports SBS v1.1 and Impedance Track™ algorithm; no LED drivers; QFN-24 package | Higher accuracy under load/aging via impedance modeling; requires external LED driver if visual indication needed | Choose BQ2084 for next-gen Li-Ion packs where long-term accuracy drift matters more than LED simplicity. |
Compared with BQ2040SN-D111, BQ2060A offers integrated memory and tighter sensing accuracy but requires PCB redesign for TSSOP; BQ2084 delivers superior aging compensation via Impedance Track but removes LED outputs and demands external display logic - making BQ2040SN-D111 optimal for cost-sensitive, LED-centric NiCd/NiMH/Li-Ion pack retrofits.
Availability
BQ2040SN-D111 is available at Aetrix Electronics and suitable for portable medical devices, industrial handheld scanners, and two-way radio battery packs requiring stable component supply, long-lifecycle support, and proven field reliability in harsh thermal environments.
Supply support for BQ2040SN-D111 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The BQ2040SN-D111 belongs to TI's Smart Battery Fuel Gauge product line, engineered specifically for SBS-compliant battery pack integration with minimal external components and robust multi-chemistry support.
FAQ
What battery chemistries does the BQ2040SN-D111 support?
The BQ2040SN-D111 supports NiCd, NiMH, and Li-Ion battery chemistries. It performs coulomb counting with chemistry-specific charge termination algorithms: current taper for Li-Ion and ∆T/∆t for nickel-based cells. Its EEPROM configuration allows setting distinct parameters per chemistry, including charging voltage, taper current, and self-discharge rate - ensuring accurate fuel gauging across all three types without hardware changes.
Does the BQ2040SN-D111 require an external EEPROM?
Yes, the BQ2040SN-D111 requires an external EEPROM for proper operation. It uses the ESCL/ESDA pins to read over 100 configuration parameters at power-up, including DesignCapacity, EDV thresholds, charge current limits, and temperature calibration values. Without this EEPROM, the BQ2040SN-D111 cannot initialize its fuel gauge model or report valid RemainingCapacity - making the external memory mandatory, not optional.
How does the BQ2040SN-D111 handle self-discharge estimation?
The BQ2040SN-D111 estimates self-discharge using an internal temperature sensor and programmable rate stored in EEPROM (address 0x4F). It applies temperature compensation - doubling the rate per +10°C above 30°C, halving per −10°C below 20°C - and decrements RemainingCapacity accordingly during idle periods. This eliminates manual recalibration and maintains SOC accuracy during storage, especially critical for medical and industrial backup batteries.
Can the BQ2040SN-D111 drive LEDs directly?
Yes, the BQ2040SN-D111 features four dedicated open-drain LED driver outputs (LED1–LED4) capable of directly sinking current for standard 20 mA LEDs. Each segment represents 25% of FullChargeCapacity in relative mode or 25% of DesignCapacity in absolute mode. The DISP pin controls activation: floating enables auto-display during ≥100 mA charge; pulling low triggers a 4-second burst - enabling simple, low-power visual fuel indication without MCU involvement.
What is the role of the PSTAT pin on the BQ2040SN-D111?
The PSTAT pin on the BQ2040SN-D111 serves as a hardware charge suspension input. When PSTAT rises to ≥1.5 V - typically asserted by a Li-Ion protection IC during overvoltage, overcurrent, or overtemperature fault - the BQ2040SN-D111 immediately sets requested charge current to zero and latches Terminate_Charge_Alarm. This provides fail-safe, sub-millisecond response independent of SMBus communication, ensuring compliance with IEC 62133 and UL 2054 battery safety standards.
BQ2040SN-D111 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage
- Interface:
- SMBus
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
BQ2040SN-D111 FAQ
1.How can I place an order for BQ2040SN-D111 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2040SN-D111 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BQ2040SN-D111 reliable?
The price and inventory of BQ2040SN-D111 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2040SN-D111 is usually 5 days.
3.What payment methods are accepted for BQ2040SN-D111?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2040SN-D111 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2040SN-D111?
BQ2040SN-D111 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2040SN-D111 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BQ2040SN-D111?
For technical support, including BQ2040SN-D111 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2040SN-D111 requirements.
6.How does Aetrix verify that BQ2040SN-D111 is sourced from the original manufacturer or authorized distributors?
All BQ2040SN-D111 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BQ2040SN-D111 meets industry standards.
7.What is the process for return or replacement of BQ2040SN-D111?
All BQ2040SN-D111 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2040SN-D111, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BQ2040SN-D111 part is unused and in its original packaging.
Return procedure for BQ2040SN-D111:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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