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Texas Instruments BQ2040SN-D111TR-TI
- Part No.:
- BQ2040SN-D111TR-TI
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
BQ2040SN-D111TR-TI.pdf
- Description:
- IC BATT MON MULTI-CHEM 3C 16SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
BQ2040SN-D111TR-TI from Texas Instruments is a Smart Battery System (SBS) v1.0–compliant gas gauge IC for NiCd, NiMH, and Li-Ion battery packs. It measures charge/discharge current via sense resistor (SR–VSS), estimates self-discharge using internal temperature sensor and timer, and reports remaining capacity, state-of-charge, and remaining time over SMBus. It drives a four-segment LED display and supports SBS charge control commands in portable medical devices and industrial handhelds.
For engineers reviewing the BQ2040SN-D111TR-TI datasheet, BQ2040SN-D111TR-TI pinout, BQ2040SN-D111TR-TI application, or BQ2040SN-D111TR-TI equivalent, key selection criteria include SMBus 2-wire interface compliance, integrated LED segment drivers (LED1–LED4), EEPROM-programmable EDV1/EDVF thresholds, REF output for external FET regulator, and support for full-cycle learning of FullChargeCapacity (FCC) with discharge-based calibration.
Technical Context
The BQ2040SN-D111TR-TI implements coulomb counting with temperature-compensated current integration and programmable digital magnitude filtering (VSRD threshold). Its internal 10-bit ADC digitizes voltage across the SR sense resistor, with ±75 µV typical offset and ±4% max INL error, enabling accurate charge tracking down to sub-10 mA levels.
It uses an internal temperature sensor (no external thermistor required) and temperature-compensated timebase (no external resonator) to adapt self-discharge estimation and charge efficiency compensation. Charge termination logic supports both Li-Ion current taper (±128 mV voltage window, configurable taper current) and NiCd/NiMH ∆T/∆t (programmable step size and hold-off timer).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3.0–6.5 V - powers device directly from 3-cell Ni-based packs or regulated supply. |
| Current Sensing Offset | ±75 µV typical - enables accurate low-current measurement without external trimming. |
| SMBus Interface | 2-wire open-drain (SMBC/SMBD) - compatible with SBS v1.0 host controllers and smart chargers. |
| LED Outputs | LED1–LED4 - drive four discrete segments for 25% granularity capacity indication; DISP pin controls activation timing. |
| Self-Discharge Rate | Programmable 0–25%/day at 20–30°C - adjustable per battery chemistry and aging profile via EEPROM. |
| EEPROM Dependency | Required for operation - stores DesignCapacity, ChargingVoltage, EDV thresholds, temperature calibrations, and FLAGS registers. |
| REF Output | Internal reference for external n-FET regulator - allows cost-effective VCC generation from higher-voltage Li-Ion packs. |
Pinout & Package
Package: 16-pin narrow SOIC (SOIC-16N), 3.9 mm width, 1.75 mm height, 0.65 mm pitch - optimized for compact battery pack PCB layout with single-point ground design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply input | Primary power rail (3.0–6.5 V); may be derived directly from 3 NiCd/NiMH cells or via REF-regulated FET circuit. |
| VSS | System ground | Single-point return for SR, SMBus, and LED circuits - critical for minimizing offset error in current sensing. |
| SR | Sense resistor input | Differential input monitoring voltage drop across external sense resistor; integrates charge/discharge activity with ±75 µV offset. |
| SMBD / SMBC | SMBus data/clock | Open-drain bidirectional interface - connects to host controller for reading RM, FCC, temperature, and writing charge commands. |
| LED1–LED4 | LED segment drivers | Active-low outputs driving external LEDs; each represents 25% of FullChargeCapacity (relative mode) or DesignCapacity (absolute mode). |
| DISP | Display control | Three-state input: high = disable, floating = auto-enable on ≥100 mA charge, low = force-on for ~4 s. |
| REF | Voltage reference | Stable reference for external n-FET + resistor regulator - enables efficient VCC generation from >6.5 V battery configurations. |
| PSTAT | Protector status input | Monitors Li-Ion protection IC overvoltage flag (≥1.5 V = suspend charge); provides hardware-level safety interlock. |
| SB | Battery sense input | High-impedance divider input for pack voltage monitoring - used for EDV1/EDVF detection and charging voltage alarm. |
Key Features
| Feature | Design Value |
|---|---|
| Full-Cycle FCC Learning | Automatically updates FullChargeCapacity register after qualified full-to-empty discharge - eliminates manual recalibration and tracks battery aging. |
| Integrated Temperature Sensor | On-die thermal sensing - removes need for external thermistor, reduces BOM count and layout complexity in sealed battery packs. |
| Programmable Digital Filter (VSRD) | Configurable noise rejection threshold (0.23–0.60 mV) - prevents false counting from transient currents or PCB noise near SR node. |
| SBS Charge Control Broadcast | Auto-sends ChargingCurrent/ChargingVoltage every 10 s to Smart Charger address - enables closed-loop charge management without host intervention. |
| Two Operating Modes | Relative (FCC-based %) and absolute (DesignCapacity-based mAh) LED display - supports both runtime estimation and fixed-capacity reporting requirements. |
Applications
| Medical Handheld Devices | Industrial Portable Test Equipment |
|---|---|
Use Scenario: Rechargeable battery pack in ultrasound probe or glucose meter requiring precise runtime prediction and low-power LED status feedback. IC Role / Device Role / Timing Role: Gas gauge IC performing real-time coulomb counting, self-discharge compensation, and SMBus reporting of RemainingCapacity and StateOfCharge. Use Value: Enables accurate "hours remaining" display and low-battery warning before clinical interruption, using only internal temperature and EEPROM-programmed EDV thresholds. | Use Scenario: Ruggedized multimeter or thermal imager with hot-swappable NiMH battery pack needing field-updatable charge parameters and LED capacity indicator. IC Role / Device Role / Timing Role: SMBus-compliant battery monitor interfacing with host MCU to report capacity, voltage, temperature, and charge status via standard SBS registers. Use Value: Supports firmware-based calibration updates via EEPROM write, eliminating need for factory reprogramming during battery replacement or recalibration campaigns. |
| Lithium-Ion Power Tools | Enterprise Two-Way Radios |
Use Scenario: High-drain Li-Ion pack in cordless drill where overcurrent and overtemperature charge suspension must be enforced at pack level. IC Role / Device Role / Timing Role: Integrated protector interface (PSTAT) and charge controller coordinating with external Li-Ion protection IC and smart charger via SBS broadcast. Use Value: Hardware-triggered charge suspension on PSTAT assertion prevents unsafe charging during cell imbalance or overvoltage events - independent of host MCU availability. | Use Scenario: Mission-critical radio with dual-battery switchover requiring seamless capacity handoff and consistent LED fuel-gauge indication across packs. IC Role / Device Role / Timing Role: Standalone gas gauge managing capacity tracking, LED display, and SMBus communication without host dependency during battery swap. Use Value: Maintains accurate RemainingCapacity across battery changes using EEPROM-stored DesignCapacity and learned FCC - avoids runtime underestimation during shift transitions. |
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 12-bit ADC, wider VCC range (2.8–25 V), no LED drivers | Supports higher-voltage Li-Ion packs and adds manufacturer access commands; requires external LED driver circuitry | Select when higher accuracy, extended voltage range, or SBS v1.1 features are required - not pin-compatible due to different pin count and function mapping |
| BQ2084 | Includes integrated 16-bit delta-sigma ADC, built-in EEPROM, SMBus v2.0, no LED outputs | Eliminates external EEPROM dependency and adds enhanced diagnostics; lacks native LED segment drivers | Choose for simplified BOM and improved resolution in new designs - requires PCB redesign due to 20-pin TSSOP package and absence of LED1–LED4 pins |
Compared with BQ2040SN-D111TR-TI, BQ2060A offers broader voltage support and newer SBS compliance but removes LED integration, while BQ2084 delivers higher ADC resolution and embedded memory at the cost of LED functionality and pin compatibility - both require layout and firmware adaptation.
Availability
BQ2040SN-D111TR-TI is available at Aetrix Electronics and suitable for medical handhelds, industrial test equipment, power tools, and two-way radios requiring stable component supply, long-lifecycle support, and proven battery fuel-gauge performance in harsh environments.
Supply support for BQ2040SN-D111TR-TI 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 specializing in analog, embedded processing, and power management technologies, with decades of experience in battery management solutions.
The BQ2040SN-D111TR-TI belongs to TI's Smart Battery Gas Gauge product line, designed specifically for embedded battery-pack integration in portable systems requiring SBS v1.0 compliance, LED-based capacity indication, and EEPROM-configurable charge algorithms.
FAQ
What is the primary function of the BQ2040SN-D111TR-TI in a battery pack?
The BQ2040SN-D111TR-TI serves as a Smart Battery System (SBS) v1.0–compliant gas gauge IC that performs real-time coulomb counting, self-discharge estimation, and state-of-charge calculation for NiCd, NiMH, and Li-Ion chemistries. It reports RemainingCapacity, FullChargeCapacity, and battery voltage over SMBus and drives a four-segment LED display. The BQ2040SN-D111TR-TI relies on external EEPROM for configuration and supports full-cycle learning to adapt to battery aging.
Does the BQ2040SN-D111TR-TI require an external EEPROM, and why?
Yes, the BQ2040SN-D111TR-TI requires an external EEPROM for proper operation. It stores critical configuration data including DesignCapacity, ChargingVoltage, EDV1/EDVF thresholds, temperature calibration values, self-discharge rate, and FLAGS registers. Without this EEPROM, the BQ2040SN-D111TR-TI cannot initialize valid capacity tracking or execute SBS-compliant charge control - the device reads EEPROM at power-up and during reset to load operational parameters.
How does the BQ2040SN-D111TR-TI handle charge termination for different battery chemistries?
The BQ2040SN-D111TR-TI supports dual-chemistry charge termination: for Li-Ion, it uses current taper detection (when pack voltage is within ±128 mV of ChargingVoltage and average current falls below EEPROM-programmed threshold for ≥100 s); for NiCd/NiMH, it applies ∆T/∆t logic with programmable temperature step (1.6–4.6°C) and time step (20–320 s). Both methods include safety overrides for overtemperature, overvoltage, and overcurrent - all enforced independently of host MCU control.
Can the BQ2040SN-D111TR-TI operate without a host microcontroller?
Yes, the BQ2040SN-D111TR-TI can operate autonomously in standalone mode. It performs continuous coulomb counting, self-discharge estimation, LED display control (via DISP pin states), and SBS charge command broadcasting without host intervention. While SMBus communication enables host readback and configuration, core gas gauge functionality - including FCC learning, LED indication, and charge suspension via PSTAT - remains fully active even with SMBus lines unconnected or held inactive.
What is the role of the REF pin on the BQ2040SN-D111TR-TI, and how is it used?
The REF pin on the BQ2040SN-D111TR-TI provides a stable internal voltage reference to drive an external n-channel FET and resistor, forming a low-cost, micropower regulator for VCC. This allows the BQ2040SN-D111TR-TI to operate from higher-voltage battery configurations (e.g., 2–4 Li-Ion cells) beyond its native 3.0–6.5 V VCC range. The REF output eliminates need for a dedicated LDO, reducing solution size and cost - typical implementation uses BSS138 or 2N7002 FET with resistor divider as shown in TI's SLUS005 application diagram.
BQ2040SN-D111TR-TI 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:
- 3
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage
- Interface:
- SMBus
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
BQ2040SN-D111TR-TI FAQ
1.How can I place an order for BQ2040SN-D111TR-TI through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2040SN-D111TR-TI 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-D111TR-TI reliable?
The price and inventory of BQ2040SN-D111TR-TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2040SN-D111TR-TI is usually 5 days.
3.What payment methods are accepted for BQ2040SN-D111TR-TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2040SN-D111TR-TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2040SN-D111TR-TI?
BQ2040SN-D111TR-TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2040SN-D111TR-TI 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-D111TR-TI?
For technical support, including BQ2040SN-D111TR-TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2040SN-D111TR-TI requirements.
6.How does Aetrix verify that BQ2040SN-D111TR-TI is sourced from the original manufacturer or authorized distributors?
All BQ2040SN-D111TR-TI 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-D111TR-TI meets industry standards.
7.What is the process for return or replacement of BQ2040SN-D111TR-TI?
All BQ2040SN-D111TR-TI units undergo pre-shipment inspection (PSI). If there is an issue with BQ2040SN-D111TR-TI, 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-D111TR-TI part is unused and in its original packaging.
Return procedure for BQ2040SN-D111TR-TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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