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Texas Instruments BQ2092SN-A311
- Part No.:
- BQ2092SN-A311
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
BQ2092SN-A311.pdf
- Description:
- IC GAS GAUGE MULTI-CHEM 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,673
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Product details
Overview
BQ2092SN-A311 from Texas Instruments is a gas gauge IC designed for battery-pack integration to monitor state-of-charge, remaining capacity, and runtime in NiCd, NiMH, and Li-Ion rechargeable batteries. It delivers 120µA typical operating current, supports SMBus-like two-wire interface (SCC/SCD), and provides LED segment outputs (SEG1–SEG4) for direct 25% incremental battery-level display.
For engineers reviewing the BQ2092SN-A311 datasheet, BQ2092SN-A311 pinout, BQ2092SN-A311 application, or BQ2092SN-A311 equivalent, key selection considerations include its integrated temperature compensation, EEPROM-programmable self-discharge rate (0–25%/day at 25°C), SR-pin-based current sensing with ±50µV offset, and support for SBData charge control commands across all three chemistries.
Technical Context
The BQ2092SN-A311 implements coulomb counting via voltage integration across an external sense resistor (SR–VSS), with real-time compensation for temperature (internal sensor), current magnitude (digital filter threshold programmable from ±0.23mV to ±0.60mV), and battery chemistry-specific charge efficiency. Its dual-mode LED display (absolute vs. relative) is controlled by DISP pin logic and modulated at ~100Hz.
It operates from 3.0–5.5V VCC, supports serial communication using open-drain SCC/SCD pins compliant with SMBus timing, and relies on external EEPROM for configuration of critical parameters including DesignCapacity (0x00/0x01), EDV1/EDVF thresholds (0x0e/0x0f, 0x10/0x11), and self-discharge rate (0x14). The REF output enables low-cost microregulator design for multi-cell configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3.0–5.5V - powers device directly from 3-cell Ni-based packs or regulated supply |
| Operating Current | 120µA typical - enables long-term battery-pack monitoring without significant drain |
| Sense Offset (VOS) | ±50µV typical - ensures accurate sub-1mA current measurement with minimal error |
| Digital Filter Threshold | Programmable ±0.23–±0.60mV - suppresses noise-induced false charge/discharge counts |
| Self-Discharge Rate | 0–25%/day at 25°C, temperature-adjusted - configurable via EEPROM byte 0x14 |
| LED Display Control | SEG1–SEG4 with 100Hz modulation - drives four external LEDs for 25% granularity visual feedback |
| Interface Protocol | Two-wire SMBus-like (SCC/SCD) - compatible with Smart Battery Data (SBData) command set |
Pinout & Package
16-pin narrow SOIC (5.3mm × 10.2mm), RoHS-compliant surface-mount package optimized for compact battery-pack PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply input | 3.0–5.5V main power rail; powers internal circuitry and LED segments |
| VSS | Ground reference | Single-point return for SR, SDA, SCL, and analog sensing - critical for offset minimization |
| SR | Sense resistor input | Monitors voltage drop across external sense resistor; integrated for coulomb counting |
| SCC / SCD | Serial clock/data | Open-drain bidirectional SMBus-like interface for register read/write and SBData commands |
| SEG1–SEG4 | LED segment outputs | Sink-current outputs driving external LEDs; modulated in alternating banks for low-power display |
| DISP | Display enable control | High = disable; floating = auto-enable on ≥100mA charge; low = 4-second forced activation |
| SB | Battery voltage sense | High-impedance input for cell-pack voltage monitoring via resistor divider; used for EDV detection |
| REF | Voltage reference output | Stable reference for external FET-based regulator - enables operation from unregulated 3-cell Ni sources |
| VOUT | EEPROM supply | Provides regulated power to external configuration EEPROM (e.g., 24C02) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated temperature sensor | Eliminates need for external thermistor - reduces BOM count and layout complexity |
| Temperature-compensated timebase | Removes requirement for external crystal/resonator - lowers cost and footprint |
| Programmable digital magnitude filter | Prevents false counting from noise or transient currents below user-defined VSR threshold |
| Self-discharge estimation engine | Adjusts RM register continuously based on EEPROM-programmed rate and real-time temperature |
| Smart Battery Data (SBData) compliance | Supports standardized charge control broadcasts (ChargingCurrent/ChargingVoltage) to Smart Chargers |
| Full-to-empty learning cycle | Updates FullChargeCapacity (FCC) only after verified discharge below EDV1 - improves long-term accuracy |
Applications
| Smart Battery Packs | Portable Medical Devices |
|---|---|
Use Scenario: Integrated into sealed NiMH battery packs for cordless power tools requiring accurate runtime prediction and LED fuel-gauge display. IC Role / Device Role / Timing Role: Gas gauge IC performing real-time coulomb counting, temperature-compensated self-discharge correction, and SMBus communication with host system. Use Value: Enables precise 25% LED-based state-of-charge indication and prevents unexpected shutdown via RemainingCapacityAlarm-triggered warnings. | Use Scenario: Embedded in portable ultrasound or infusion pump battery modules where safety-critical low-battery alerts must trigger before clinical interruption. IC Role / Device Role / Timing Role: Primary fuel gauge providing AbsoluteStateOfCharge (0x0e), RunTimeToEmpty (0x11), and Temperature (0x08) over SMBus interface. Use Value: Delivers traceable, EEPROM-configured capacity tracking with EDV1/EDVF dual-threshold voltage monitoring for fail-safe end-of-life detection. |
| Laptop Secondary Batteries | Industrial Handheld Scanners |
Use Scenario: Used in removable Li-Ion secondary battery packs for enterprise laptops needing SBData-compliant charge coordination with system charger ICs. IC Role / Device Role / Timing Role: Smart Battery Manager broadcasting ChargingVoltage() and ChargingCurrent() to Smart Charger address per SBData spec. Use Value: Ensures safe, chemistry-aware charging termination using programmed ∆T/∆t and max temperature limits - no host firmware dependency. | Use Scenario: Deployed in ruggedized barcode scanners powered by NiCd packs operating in variable-temperature warehouses. IC Role / Device Role / Timing Role: Standalone gas gauge with DISP-controlled LED display and internal temperature adaptation for capacity derating below 5°C. Use Value: Maintains usable runtime estimates across -10°C to +60°C via RemainingCapacity compensation equation (TCC = 0.004), avoiding premature "empty" indications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2084DBTR | 14-pin TSSOP; lacks LED segment outputs (SEG1–SEG4); uses I²C instead of SMBus-like protocol | No direct LED display capability; requires external MCU for UI rendering | Select when board space is constrained and LED display is unnecessary |
| BQ20Z75-V165 | Enhanced algorithm with Impedance Track™; 20-pin VQFN; supports Li-Ion only; higher accuracy (±1% SoC) | Not suitable for NiCd/NiMH; requires different EEPROM programming structure and calibration flow | Select for high-accuracy Li-Ion applications where chemistry is fixed and layout allows larger package |
Compared with BQ2092SN-A311, BQ2084DBTR removes LED drive capability and simplifies interface but sacrifices standalone display functionality, while BQ20Z75-V165 offers superior Li-Ion accuracy and advanced modeling at the cost of multi-chemistry support and increased design complexity.
Availability
BQ2092SN-A311 is available at Aetrix Electronics and suitable for smart battery packs, portable medical devices, industrial handheld scanners, and laptop secondary batteries requiring stable component supply and long-lifecycle support.
Supply support for BQ2092SN-A311 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 BQ2092SN-A311 belongs to TI's battery management IC portfolio, engineered specifically for cost-sensitive, space-constrained battery-pack integration with multi-chemistry support and minimal external components.
FAQ
What battery chemistries does the BQ2092SN-A311 support?
The BQ2092SN-A311 supports NiCd, NiMH, and Li-Ion rechargeable battery chemistries. It implements chemistry-specific charge efficiency compensation, self-discharge modeling, and termination criteria - for example, using ∆T/∆t for NiMH and voltage-based cutoff for Li-Ion. All required parameters (e.g., ChargingCurrent, ChargingVoltage, EDV thresholds) are stored in external EEPROM and applied dynamically by the BQ2092SN-A311 during operation.
Does the BQ2092SN-A311 require an external EEPROM?
Yes, the BQ2092SN-A311 requires an external EEPROM for proper operation. Configuration values including DesignCapacity (0x00/0x01), EDV1/EDVF (0x0e/0x0f, 0x10/0x11), self-discharge rate (0x14), and battery chemistry identifiers are loaded from EEPROM at power-up. The VOUT pin supplies regulated power to this EEPROM, and SCL/SDA pins handle memory access during initialization and runtime updates.
How does the BQ2092SN-A311 handle temperature compensation?
The BQ2092SN-A311 uses an integrated temperature sensor to compensate charge/discharge counting, self-discharge estimation, and RemainingCapacity display. It applies a linear adjustment (TCC = 0.004) below 5°C and scales self-discharge rate exponentially (doubling per +10°C above 25°C). Temperature data is accessible via register 0x08 and used internally for real-time RM register correction - no external thermistor or calibration is needed.
Can the BQ2092SN-A311 drive LEDs directly without external transistors?
Yes, the BQ2092SN-A311 drives LEDs directly through SEG1–SEG4 outputs, each capable of sinking current sourced from VCC. These outputs are modulated at ~100Hz in alternating banks (SEG1+SEG3 vs. SEG2+SEG4) to reduce average power. No external transistors are required for standard low-current indicator LEDs, though DISP pin logic (floating/high/low) determines activation mode and duration per the BQ2092SN-A311 functional specification.
What is the purpose of the SR and VSS pins on the BQ2092SN-A311?
The SR and VSS pins form the differential input for coulomb counting: SR senses the voltage drop across an external sense resistor placed between battery negative and system ground, while VSS serves as the precision analog ground reference. Their layout must follow single-point grounding rules to minimize offset error (typical VOS = ±50µV); shared high-current return paths degrade BQ2092SN-A311 measurement accuracy and cause drift in RemainingCapacity (RM) calculation.
BQ2092SN-A311 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Battery Monitor
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- I2C
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
BQ2092SN-A311 FAQ
1.How can I place an order for BQ2092SN-A311 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2092SN-A311 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 BQ2092SN-A311 reliable?
The price and inventory of BQ2092SN-A311 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2092SN-A311 is usually 5 days.
3.What payment methods are accepted for BQ2092SN-A311?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2092SN-A311 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2092SN-A311?
BQ2092SN-A311 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2092SN-A311 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 BQ2092SN-A311?
For technical support, including BQ2092SN-A311 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2092SN-A311 requirements.
6.How does Aetrix verify that BQ2092SN-A311 is sourced from the original manufacturer or authorized distributors?
All BQ2092SN-A311 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 BQ2092SN-A311 meets industry standards.
7.What is the process for return or replacement of BQ2092SN-A311?
All BQ2092SN-A311 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2092SN-A311, 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 BQ2092SN-A311 part is unused and in its original packaging.
Return procedure for BQ2092SN-A311:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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