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Texas Instruments BQ2092SN-A311TR
- Part No.:
- BQ2092SN-A311TR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
BQ2092SN-A311TR.pdf
- Description:
- IC GAS GAUGE LITH-ION 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,581
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Product details
Overview
BQ2092SN-A311TR from Texas Instruments is a gas gauge IC for NiCd, NiMH, and Li-Ion battery packs, delivering accurate remaining capacity (mAh), state-of-charge (%), and runtime-to-empty (minutes) via SMBus-like two-wire interface. It integrates an internal temperature sensor, programmable self-discharge compensation, and four-segment LED display control. Designed for embedded battery-pack integration, it operates from 3.0–5.5 V with 120 µA typical quiescent current.
For engineers reviewing the BQ2092SN-A311TR datasheet, BQ2092SN-A311TR pinout, BQ2092SN-A311TR application, or BQ2092SN-A311TR equivalent, key selection criteria include its support for SBData charge control commands, EEPROM-programmable EDV thresholds and self-discharge rate, internal temperature-compensated current integration, and direct LED segment drive capability without external drivers.
Technical Context
The BQ2092SN-A311TR implements coulomb counting using voltage measurement across an external sense resistor (SR–VSS), with integrated offset correction (±50 µV typ) and digital magnitude filtering (configurable VSRD threshold down to ±0.23 mV). Its internal temperature sensor (0.1°K resolution) enables real-time compensation of charge/discharge efficiency and self-discharge estimation-doubling per +10°C above 20°C up to 70°C.
It supports Smart Battery Data (SBData) command set over open-drain SCC/SCD pins, including RemainingCapacity (0x0F), FullChargeCapacity (0x10), BatteryStatus (0x16), and ChargingVoltage (0x15). Charge control is implemented via broadcast to Smart Charger address, with termination logic based on ΔT/Δt (programmable 20–320 s), max temperature (configurable), and 256 mAh over-FCC safety cutoff.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0–5.5 V - powers directly from 3-cell Ni-based packs or regulated system rail |
| Operating Current | 120 µA typical - enables low-power battery-pack monitoring without significant self-load |
| Interface | Two-wire SMBus-like (SCC/SCD) - compatible with Smart Battery System host controllers |
| Current Sensing Accuracy | ±2% INL (±4% max) - includes temp/voltage drift compensation for stable mAh tracking |
| Temperature Sensing | Internal sensor, 0.1°K resolution - eliminates external thermistor BOM cost and layout complexity |
| Self-Discharge Compensation | Programmable 0–25%/day at 25°C, temp-adjusted - prevents RM register drift during storage |
| LED Drive Outputs | SEG1–SEG4, open-drain sink - drives 4-segment display directly with 100 Hz PWM and low-battery blink mode |
Pinout & Package
16-pin narrow SOIC (SOIC-16N), 3.9 mm width, 1.27 mm pitch, RoHS-compliant package suitable for high-density battery pack PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 3.0–5.5 V; powers internal circuitry and sources current for SEG outputs |
| VSS | Ground reference | Single-point ground return required for SR sensing accuracy; separate from high-current paths |
| SR | Sense resistor input | Measures differential voltage across external sense resistor; integrated offset <±50 µV typ |
| SB | Battery voltage monitor | High-impedance input for cell-pack voltage via resistor divider; used for EDV1/EDVF detection |
| SCC / SCD | SMBus clock/data | Open-drain bidirectional pins; require external pull-ups; support read word/write word protocols |
| SEG1–SEG4 | LED segment drivers | Open-drain sinks; each drives one LED segment; modulated at ~100 Hz with 30% duty cycle |
| DISP | Display enable control | High = disable; floating = auto-enable on ≥100 mA charge; low = force-on for 4 s |
| REF | Voltage reference output | Provides stable reference for external FET-based microregulator to power VCC from 3-cell Ni packs |
| VOUT | EEPROM supply output | Supplies regulated power to external configuration EEPROM (e.g., 24C02); eliminates separate LDO |
Key Features
| Feature | Design Value |
|---|---|
| Integrated temperature sensor | Eliminates need for external thermistor, reducing component count and thermal calibration effort |
| Programmable digital filter (DMF) | Configurable VSRD threshold (±0.23–±0.60 mV) prevents false charge/discharge counting from noise or transient spikes |
| Self-learning FullChargeCapacity (FCC) | Updates FCC only after full discharge to EDV1, ensuring capacity model adapts to actual aging and usage patterns |
| SBData charge control broadcast | Directly commands Smart Chargers with ChargingCurrent() and ChargingVoltage(), enabling closed-loop pack-level charging |
| EEPROM-configurable parameters | Over 50 registers (e.g., DesignCapacity, EDV1, self-discharge rate, ΔT/Δt) stored externally for field reprogramming |
Applications
| Laptop Battery Pack | Medical Portable Monitor |
|---|---|
Use Scenario: Integrated into multi-cell Li-Ion smart battery pack for OEM laptop systems requiring precise runtime prediction and SMBus communication with host BIOS. IC Role / Device Role / Timing Role: Primary gas gauge IC performing real-time coulomb counting, temperature-compensated self-discharge estimation, and SMBus register reporting (RemainingCapacity, BatteryStatus). Use Value: Enables accurate "XX minutes remaining" display and graceful OS shutdown before deep discharge, meeting UL2054 and IEC62133 compliance requirements. | Use Scenario: Embedded in sealed NiMH battery pack powering portable ECG or pulse oximeter devices with strict runtime and safety certification needs. IC Role / Device Role / Timing Role: Standalone fuel gauge managing charge/discharge cycles, low-voltage cutoff (EDV1), and LED-based battery level indication without host processor intervention. Use Value: Provides fail-safe battery state visibility via 4-segment LED display and eliminates need for external ADC/microcontroller, reducing BOM and design validation scope. |
| Industrial Handheld Scanner | Power Tool Battery Pack |
Use Scenario: Used in ruggedized barcode scanner battery packs operating across -10°C to +60°C ambient, requiring reliable capacity estimation under variable load and temperature. IC Role / Device Role / Timing Role: Gas gauge IC compensating remaining capacity for temperature (TCC = 0.004/°C below 5°C) and dynamically adjusting RM register based on real-time VSR and T readings. Use Value: Delivers consistent runtime estimates across temperature extremes, preventing premature shutdown during cold warehouse operation. | Use Scenario: Deployed in cordless drill/driver battery packs with high-current discharge (≥6 A) and nickel-based chemistry, needing robust EDV monitoring and charge termination. IC Role / Device Role / Timing Role: Fuel gauge IC implementing ΔT/Δt-based charge termination, over-temperature suspend, and maintenance current handoff for NiMH cells. Use Value: Prevents thermal runaway during fast charging by suspending charge if ΔT/Δt exceeds programmed slope (e.g., 2°C/120 s), satisfying UL1642 thermal safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2084DBTR | Same 16-pin SOIC package; lacks LED segment outputs (SEG1–SEG4); no DISP pin; requires external driver for display | Requires additional components for visual battery indication; better suited for host-controlled UI via SMBus only | Select when LED display is unnecessary and board space is constrained by external driver elimination |
| BQ20Z75-V165 | Enhanced firmware, integrated 10-bit ADC, higher accuracy (±1% INL), supports Li-Ion only (no NiCd/NiMH), 20-pin TSSOP | Not drop-in compatible; requires PCB redesign; targets premium Li-Ion applications with tighter SoC tolerance | Select when higher accuracy and Li-Ion-only support justify layout change and cost increase |
Compared with BQ2084DBTR, the BQ2092SN-A311TR provides integrated LED drive and DISP control for standalone visual feedback, while BQ20Z75-V165 offers superior accuracy and modern firmware but sacrifices multi-chemistry support and pin compatibility-making BQ2092SN-A311TR optimal for cost-sensitive, display-enabled NiCd/NiMH/Li-Ion pack designs.
Availability
BQ2092SN-A311TR is available at Aetrix Electronics and suitable for laptop battery packs, medical portable monitors, industrial handheld scanners, and power tool battery packs requiring stable component supply, long-lifecycle support, and validated gas gauge performance.
Supply support for BQ2092SN-A311TR 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 expertise in battery management solutions.
The BQ2092SN-A311TR belongs to TI's Smart Battery Gas Gauge product line, engineered specifically for cost-effective, self-contained fuel gauging in replaceable battery packs across consumer, medical, and industrial equipment.
FAQ
What battery chemistries does the BQ2092SN-A311TR support?
The BQ2092SN-A311TR supports NiCd, NiMH, and Li-Ion rechargeable battery chemistries. It implements chemistry-specific charge control algorithms-including ΔT/Δt termination for NiMH and voltage-based cutoff for Li-Ion-and allows EEPROM programming of parameters like fast charge efficiency (QEFC) and maintenance charge efficiency (QETC). The BQ2092SN-A311TR does not support lead-acid or LiFePO4 chemistries.
Does the BQ2092SN-A311TR require an external EEPROM?
Yes, the BQ2092SN-A311TR requires an external EEPROM (e.g., 24C02) for proper operation. Critical configuration data-including DesignCapacity, EDV1, self-discharge rate, and charge voltage-is stored in the EEPROM and loaded at power-up. The BQ2092SN-A311TR provides VOUT to power the EEPROM and uses SCL/SDA pins for programming the memory during initial setup.
How does the BQ2092SN-A311TR handle temperature compensation?
The BQ2092SN-A311TR uses an internal temperature sensor (0.1°K resolution) to compensate charge/discharge integration, self-discharge estimation, and remaining capacity display. It applies a linear adjustment (TCC = 0.004/°C) below 5°C and scales self-discharge rate exponentially (doubling per +10°C). Temperature data is accessible via register 0x08 and used automatically in RM register updates-no external thermistor or calibration is needed.
Can the BQ2092SN-A311TR operate directly from a 3-cell NiMH pack?
Yes, the BQ2092SN-A311TR can operate directly from a 3-cell NiMH pack (nominal 3.6 V, max ~4.5 V). Its VCC range is 3.0–5.5 V, and the REF output enables building a simple FET-based microregulator to maintain stable VCC during voltage sag. An optional Zener diode (e.g., BZX84C5V6) is recommended on VCC to clamp transients during charging.
What is the function of the DISP pin on the BQ2092SN-A311TR?
The DISP pin on the BQ2092SN-A311TR controls LED display activation: high disables all SEG outputs; floating enables automatic activation during ≥100 mA charge; low forces SEG1–SEG4 active for ~4 seconds. This allows flexible user interface implementation-e.g., momentary press for battery check or auto-display during charging-without requiring host MCU intervention. The BQ2092SN-A311TR interprets DISP state independently of SMBus commands.
BQ2092SN-A311TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-A311TR FAQ
1.How can I place an order for BQ2092SN-A311TR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2092SN-A311TR 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-A311TR reliable?
The price and inventory of BQ2092SN-A311TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2092SN-A311TR is usually 5 days.
3.What payment methods are accepted for BQ2092SN-A311TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2092SN-A311TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2092SN-A311TR?
BQ2092SN-A311TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2092SN-A311TR 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-A311TR?
For technical support, including BQ2092SN-A311TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2092SN-A311TR requirements.
6.How does Aetrix verify that BQ2092SN-A311TR is sourced from the original manufacturer or authorized distributors?
All BQ2092SN-A311TR 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-A311TR meets industry standards.
7.What is the process for return or replacement of BQ2092SN-A311TR?
All BQ2092SN-A311TR units undergo pre-shipment inspection (PSI). If there is an issue with BQ2092SN-A311TR, 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-A311TR part is unused and in its original packaging.
Return procedure for BQ2092SN-A311TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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