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Texas Instruments BQ2092SN-A309TR
- Part No.:
- BQ2092SN-A309TR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- -
- Datasheet:
-
BQ2092SN-A309TR.pdf
- Description:
- IC SUPERVISOR PWR SUP SUPPORT
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Product details
Overview
BQ2092SN-A309TR from Texas Instruments is a gas gauge IC for NiCd, NiMH, and Li-Ion battery packs, delivering accurate real-time state-of-charge (SoC), remaining capacity (mAh), and run-time-to-empty estimation via SMBus-like two-wire interface. It integrates an internal temperature sensor, programmable self-discharge compensation, and four-segment LED display control - operating at 120µA typical current in a 16-pin narrow SOIC package.
For engineers reviewing the BQ2092SN-A309TR datasheet, BQ2092SN-A309TR pinout, BQ2092SN-A309TR application, or BQ2092SN-A309TR equivalent, key selection considerations include its support for SBData charge control commands, EEPROM-based calibration for chemistry-specific parameters, temperature-compensated current integration, and direct LED segment drive without external drivers.
Technical Context
The BQ2092SN-A309TR implements coulomb counting with voltage- and temperature-compensated integration of sense-resistor voltage (VSR) across SR–VSS pins, using a programmable digital magnitude filter (DMF) to reject sub-threshold transients. Its internal 0.1°K-resolution temperature sensor enables adaptive self-discharge modeling and charge efficiency correction per chemistry.
It communicates via open-drain SCC/SCD pins using Smart Battery Data (SBData) read/write word and block protocols, supporting registers including RemainingCapacity (0x0F), FullChargeCapacity (0x10), BatteryStatus (0x16), and programmable thresholds like EDV1 (0x0E) and ChargingVoltage (0x07). The device requires external EEPROM for configuration storage and supports both absolute (design-capacity referenced) and relative (FCC-referenced) LED display modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3.0–5.5V - powers IC directly from 3-cell Ni-based packs or regulated supply; REF output enables low-cost microregulator design. |
| Operating Current | 120µA typical - enables long-term battery-pack monitoring without significant parasitic drain. |
| Interface | Two-wire SMBus-like (SCC/SCD) - compatible with Smart Battery System hosts; supports SBData commands including ChargingCurrent() and ChargingVoltage(). |
| Accuracy Compensation | Current, temperature, and self-discharge - integrated non-linearity error ±2% typical; offset voltage ±50µV; temperature compensation applied to RM, FCC, and charge efficiency. |
| LED Display | Four-segment direct drive (SEG1–SEG4) - displays SoC in 25% increments; modulated at ~100Hz; DISP pin enables on-demand or auto-activation at ≥100mA charge rate. |
| Sense Input | SR–VSS differential input - measures VSR for coulomb counting; supports programmable digital filter (DMF) with |VSRD| down to ±0.23mV (DMF=200). |
| EEPROM Dependency | Required for operation - stores DesignCapacity, EDV thresholds, charging parameters, chemistry data, and self-discharge rate; programmed via SDA/SCL pins. |
Pinout & Package
Package: 16-pin narrow SOIC (5.3mm × 10.2mm), RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply voltage input | 3.0–5.5V main power rail; supports direct connection to 3-cell Ni-based battery packs. |
| VSS | System ground | Single-point ground reference for SR, SDA, SCC, and analog circuitry; critical for low-offset current sensing. |
| SR | Sense resistor input | Differential input measuring voltage drop across external sense resistor; VSR < VSS = discharge, VSR > VSS = charge. |
| SB | Battery sense input | High-impedance input for cell-pack voltage monitoring via resistor divider; used for EDV detection and charge termination. |
| SCC / SCD | Serial communication clock/data | Open-drain bidirectional SMBus-like interface; requires external pull-ups; supports SBData register access and charge control broadcast. |
| SDA / SCL | Serial memory data/clock | Interface to external EEPROM for configuration storage; separate from SCC/SCD; uses standard I²C timing. |
| SEG1–SEG4 | LED segment outputs | Active-low, current-sinking outputs driving LEDs directly; modulated in two banks (1+3 vs 2+4) at ~100Hz. |
| DISP | Display control input | Controls LED activation: high = disabled; floating = auto-enable at ≥100mA charge; low = forced 4-second display. |
| REF | Voltage reference output | Reference for external n-FET regulator; enables low-cost VCC generation for diverse battery configurations. |
| VOUT | EEPROM supply output | Provides regulated power to external EEPROM; eliminates need for separate EEPROM supply rail. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated temperature sensor | 0.1°K resolution eliminates need for external thermistor - reduces BOM count and layout complexity in compact battery packs. |
| Programmable self-discharge model | Rate set via EEPROM (0–25%/day at 25°C), doubling per +10°C or halving per −10°C - enables accurate long-term SoC holdover without periodic recharging. |
| Chemistry-agnostic charge control | Supports SBData broadcast of ChargingCurrent() and ChargingVoltage() for Li-Ion, NiMH, and NiCd - enables interoperability with Smart Battery Chargers without host MCU intervention. |
| Automatic capacity learning | FCC updated only after full discharge (RM=0 → EDV1 detected) with valid conditions - ensures learned capacity reflects actual aging and usage patterns, not partial cycles. |
| Dual-mode LED display | Switches between absolute (25% of DesignCapacity) and relative (25% of FCC) modes - visually indicates battery wear as FCC degrades below DC over time. |
Applications
| Smart Battery Packs | Portable Medical Devices |
|---|---|
Use Scenario: Integrated into sealed NiMH battery packs for cordless power tools, providing real-time SoC and runtime estimates to end users via LED indicators. IC Role / Device Role / Timing Role: Gas gauge IC performing coulomb counting, temperature-compensated self-discharge estimation, and SMBus communication with host tool controller. Use Value: Enables accurate fuel-gauge reporting without host MCU overhead; 120µA quiescent current extends shelf life; LED segments eliminate need for display driver IC. | Use Scenario: Used in portable infusion pumps requiring precise battery life prediction to ensure uninterrupted therapy delivery during clinical use. IC Role / Device Role / Timing Role: Primary state-of-charge estimator interfacing with pump MCU via SMBus; monitors voltage, current, and temperature to validate safe discharge limits. Use Value: Supports FDA-critical runtime alarms via RemainingTimeAlarm() register; internal temp sensor meets IEC 60601-1 thermal accuracy requirements; EEPROM-programmed EDV thresholds ensure consistent low-voltage cutoff. |
| Laptop Battery Subsystems | Industrial Handheld Scanners |
Use Scenario: Embedded in multi-cell Li-Ion battery modules for enterprise laptops, communicating SoC and health metrics to system BIOS via SMBus. IC Role / Device Role / Timing Role: Smart Battery Data (SBData) compliant gas gauge managing charge control broadcasts, cycle counting, and manufacturer data storage. Use Value: Enables Windows ACPI battery reporting; FCC learning adapts to cell aging across 300+ cycles; VOUT powers EEPROM without additional LDO. | Use Scenario: Deployed in ruggedized barcode scanners powered by replaceable NiCd packs, where LED display gives instant visual battery status to field technicians. IC Role / Device Role / Timing Role: Standalone gas gauge with direct LED drive and DISP-triggered display activation - operates independently of scanner host processor. Use Value: 4-second manual display activation (DISP low) allows quick battery check without powering up full system; narrow SOIC footprint fits constrained PCB space (<34 in² total solution). |
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; supports identical SBData protocol but lacks internal temperature sensor - requires external thermistor for full compensation. | Requires additional BOM components and layout area for thermal sensing; less suitable for ultra-compact or cost-sensitive sealed packs. | Select BQ2084DBTR only if external temperature measurement is already present and EEPROM programming infrastructure is shared. |
| BQ27426YZFT | Modern single-chip Li-Ion gas gauge with integrated sense resistor; 12-bit ADC, 0.5% SoC accuracy; uses I²C, not SMBus-like; no LED drive outputs. | No native LED display support; optimized for Li-Ion only; requires different firmware interface and layout (no SR/VSS differential routing needed). | Choose BQ27426YZFT for new Li-Ion designs prioritizing higher accuracy and smaller size, but expect redesign of communication layer and display subsystem. |
Compared with BQ2092SN-A309TR, BQ2084DBTR trades integrated temperature sensing for legacy compatibility, while BQ27426YZFT replaces discrete sensing and LED drive with monolithic precision - making BQ2092SN-A309TR uniquely suited for cost-optimized, multi-chemistry battery packs needing embedded visual feedback.
Availability
BQ2092SN-A309TR is available at Aetrix Electronics and suitable for smart battery packs, portable medical devices, industrial handheld scanners, and laptop subsystems requiring stable component supply, long-term lifecycle support, and proven field reliability in sealed NiCd/NiMH/Li-Ion applications.
Supply support for BQ2092SN-A309TR 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 leadership in battery management ICs.
The BQ2092SN-A309TR belongs to TI's Smart Battery Gas Gauge product line, designed specifically for embedded, chemistry-flexible battery pack monitoring with minimal external components and SMBus interoperability.
FAQ
What battery chemistries does the BQ2092SN-A309TR support?
The BQ2092SN-A309TR supports NiCd, NiMH, and Li-Ion rechargeable battery chemistries. It implements chemistry-specific charge control algorithms, self-discharge models, and voltage threshold settings - all programmable via external EEPROM. The device reads chemistry identification strings from EEPROM (register 0x22) and applies appropriate compensation for current integration, temperature response, and charge termination logic.
Does the BQ2092SN-A309TR require an external EEPROM?
Yes, the BQ2092SN-A309TR requires an external EEPROM for proper operation. Configuration parameters - including DesignCapacity, EDV thresholds, ChargingVoltage, self-discharge rate, and chemistry data - are stored in EEPROM and loaded at power-up via SDA/SCL pins. Without EEPROM, the device defaults to invalid values and cannot perform accurate gas gauging or charge control.
How does the BQ2092SN-A309TR handle temperature compensation?
The BQ2092SN-A309TR uses an integrated temperature sensor (0.1°K resolution) to compensate current integration, self-discharge estimation, and charge efficiency calculations. Temperature data adjusts the RemainingCapacity (RM) register based on battery thermal derating curves and modifies self-discharge rate per 10°C step. No external thermistor is required, reducing system cost and layout complexity.
Can the BQ2092SN-A309TR drive LEDs directly?
Yes, the BQ2092SN-A309TR provides four dedicated LED segment outputs (SEG1–SEG4) that sink current directly from VCC. Each output drives one LED segment in a 25%-increment display, modulated at ~100Hz in alternating banks. The DISP pin enables manual (low pulse) or automatic (≥100mA charge) activation - eliminating need for external LED drivers or PWM controllers.
What is the function of the SR and VSS pins on the BQ2092SN-A309TR?
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 analog ground reference. The BQ2092SN-A309TR integrates VSR over time to compute charge/discharge activity, with offset voltage specified at ±50µV typical - demanding strict single-point ground layout to maintain accuracy.
BQ2092SN-A309TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Battery Chemistry:
- -
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
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BQ2092SN-A309TR FAQ
1.How can I place an order for BQ2092SN-A309TR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2092SN-A309TR 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-A309TR reliable?
The price and inventory of BQ2092SN-A309TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2092SN-A309TR is usually 5 days.
3.What payment methods are accepted for BQ2092SN-A309TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2092SN-A309TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2092SN-A309TR?
BQ2092SN-A309TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2092SN-A309TR 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-A309TR?
For technical support, including BQ2092SN-A309TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2092SN-A309TR requirements.
6.How does Aetrix verify that BQ2092SN-A309TR is sourced from the original manufacturer or authorized distributors?
All BQ2092SN-A309TR 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-A309TR meets industry standards.
7.What is the process for return or replacement of BQ2092SN-A309TR?
All BQ2092SN-A309TR units undergo pre-shipment inspection (PSI). If there is an issue with BQ2092SN-A309TR, 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-A309TR part is unused and in its original packaging.
Return procedure for BQ2092SN-A309TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ2092SN-A309TR Tags
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