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Texas Instruments BQ2092SN-A309
- Part No.:
- BQ2092SN-A309
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- -
- Datasheet:
-
BQ2092SN-A309.pdf
- Description:
- IC SUPERVISOR PWR SUP SUPPORT
- Quantity:
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Product details
Overview
BQ2092SN-A309 from Texas Instruments is a gas gauge IC designed for battery-pack integration in NiCd, NiMH, and Li-Ion systems. It delivers accurate remaining capacity (mAh), state-of-charge (%), and runtime-to-empty (minutes) via SMBus-like two-wire interface, with 120µA typical operating current and integrated temperature compensation. Used in portable medical devices, power tools, and smart battery packs requiring precise fuel gauging without external thermistors or resonators.
For engineers reviewing the BQ2092SN-A309 datasheet, BQ2092SN-A309 pinout, BQ2092SN-A309 application, or BQ2092SN-A309 equivalent, key selection criteria include its 16-pin narrow SOIC package, EEPROM-programmable self-discharge rate (0–25%/day at 25°C), dual EDV thresholds (EDV1/EDVF), SBData charge control support, and LED segment outputs (SEG1–SEG4) for direct 25%-increment battery display.
Technical Context
The BQ2092SN-A309 implements coulomb counting with voltage- and temperature-compensated integration of sense-resistor voltage (VSR) across SR–VSS pins. Its internal 0.1°K-resolution temperature sensor and programmable digital filter (DMF = 0x96 default, ±0.30 mV threshold) eliminate noise-induced false charge/discharge counts.
It supports Smart Battery Data (SBData) command set over open-drain SCC/SCD lines, including ChargingCurrent(), ChargingVoltage(), and BatteryStatus() register reads. Charge control logic enforces safety termination at +256 mAh above FullChargeCapacity (FCC), with ∆T/∆t monitoring configurable for NiMH (e.g., 2°C/120s) and thermal hold-off timer activation above 25°C.
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 VCC; REF output enables low-threshold FET microregulator. |
| Operating Current | 120 µA typical - enables ultra-low-power operation in always-on battery monitoring applications. |
| Interface | Two-wire SMBus-like (SCC/SCD) - open-drain, bidirectional, compatible with Smart Battery System host controllers. |
| Accuracy Compensation | Current, temperature, and self-discharge - integrates VSR with ±50 µV offset (typ), 0.1°K temp resolution, and user-programmable self-discharge rate. |
| LED Outputs | SEG1–SEG4 - four independent sink outputs for 25%-increment graphical battery display; modulated at ~100 Hz, blink at 4 Hz on EDV1 alarm. |
| EEPROM Dependency | Required - stores DesignCapacity, EDV thresholds, charging parameters, chemistry data, and serial number; no operation without external EEPROM. |
| Digital Filter | Programmable DMF (default 0x96 = ±0.30 mV) - rejects sub-threshold current transients to prevent erroneous RM/DCR updates. |
Pinout & Package
Package: 16-pin narrow SOIC (5.3 mm × 10.2 mm), RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply input | 3.0–5.5 V main power; supports direct connection to 3-cell Ni-based battery packs. |
| VSS | Ground reference | Single-point ground return required for SR–VSS sensing; critical for <±50 µV offset accuracy. |
| SR | Sense resistor input | Monitors voltage drop across external sense resistor; polarity determines charge (+) vs discharge (–) integration direction. |
| SB | Battery voltage monitor | High-impedance input for cell pack voltage via resistor divider; used for EDV1/EDVF detection and charging voltage validation. |
| SCC / SCD | SMBus clock/data | Open-drain bidirectional lines; require external pull-ups; implement SBData read/write word/block protocols per Figure 3. |
| SEG1–SEG4 | LED segment drivers | Sink outputs for 25% incremental battery state display; DISP pin controls activation timing and mode (float = auto-on >100 mA, low = 4 s pulse). |
| REF | Voltage reference | Stable reference for external FET-based microregulator; enables cost-effective VCC generation for diverse cell configurations. |
| VOUT | EEPROM supply | Provides regulated power to external configuration EEPROM; eliminates need for separate EEPROM LDO. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated temperature sensor | 0.1°K resolution eliminates external thermistor, reducing BOM count and layout complexity in compact battery packs. |
| Self-discharge estimation | Programmable 0–25%/day at 25°C, doubling per +10°C or halving per –10°C; compensates RM/DCR continuously without host intervention. |
| FCC learning algorithm | Updates FullChargeCapacity only after full discharge to EDV1 with valid conditions (no mid-charge, temp ≥0°C, self-discharge ≤256 mAh), ensuring long-term capacity tracking accuracy. |
| Charge control broadcast | Transmits ChargingCurrent() and ChargingVoltage() to Smart Charger address per SBData spec; supports NiMH ∆T/∆t and Li-Ion voltage-based termination. |
| Dual display modes | Absolute mode (25% of DesignCapacity) and relative mode (25% of FCC); temperature-compensated output reflects real-world available energy at ambient conditions. |
Applications
| Portable Medical Devices | Power Tools |
|---|---|
Use Scenario: Rechargeable battery pack in handheld ultrasound or infusion pump requiring precise runtime prediction and low-battery warning before clinical interruption. IC Role / Device Role / Timing Role: Gas gauge IC performing real-time coulomb counting, temperature-compensated self-discharge correction, and EDV1-triggered alarm signaling via BatteryStatus register. Use Value: Enables >95% state-of-charge accuracy across 0–45°C, eliminating unexpected shutdowns during critical procedures through reliable remaining-time-to-empty (RTTE) calculation. | Use Scenario: High-drain 12–18 V NiMH/NiCd battery pack in cordless drill/driver where rapid charge/discharge cycles demand adaptive capacity learning. IC Role / Device Role / Timing Role: Fuel gauge managing FCC updates post-full-discharge, enforcing ∆T/∆t charge termination, and broadcasting maintenance current when Fully_Charged bit is set. Use Value: Extends usable cycle life by preventing overcharge via dual-temperature safety (max temp + ∆T/∆t), while SEG1–SEG4 provides immediate visual feedback during tool operation. |
| Smart Battery Packs | Laptop Subsystems |
Use Scenario: Replaceable smart battery module for industrial handheld computers needing SMBus-compliant telemetry and OEM branding (ManufacturerName/DeviceChemistry in EEPROM). IC Role / Device Role / Timing Role: SMBus slave device exposing 32+ registers (e.g., RemainingCapacity, CycleCount, SerialNumber) for host system battery management firmware. Use Value: Delivers certified Smart Battery Data compliance without external microcontroller; EEPROM-programmable chemistry and design parameters enable one hardware design across multiple battery variants. | Use Scenario: Secondary battery fuel gauge in laptop docking station or hot-swap bay where space-constrained PCB (<34 in²) requires minimal external components. IC Role / Device Role / Timing Role: Compact gas gauge integrating reference (REF), EEPROM supply (VOUT), and LED drivers (SEG1–SEG4) to minimize supporting circuitry. Use Value: Reduces board area by eliminating discrete regulators, level shifters, and display drivers; 120 µA quiescent current preserves host-system standby time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2084DBTR | 4-wire interface (SCL/SDA/SR/SC), no LED outputs, supports Li-Ion only, lower quiescent current (85 µA) | Lacks SEG1–SEG4 and SB pin; requires external thermistor; suited for embedded host-controlled systems without local display | Select BQ2084DBTR when SMBus host control is primary requirement and LED display is unnecessary. |
| BQ20Z75-V155 | Enhanced firmware, integrated ADC for voltage/current/temperature, supports Impedance Track™ algorithm, 20-pin TSSOP | Higher accuracy (±1% SoC), supports complex chemistries (LiPo, LiFePO₄), requires firmware update infrastructure | Select BQ20Z75-V155 when advanced impedance-based gauging and multi-chemistry flexibility outweigh cost and size constraints. |
Compared with BQ2092SN-A309, BQ2084DBTR offers lower power but removes local LED feedback and nickel-chemistry support, while BQ20Z75-V155 adds algorithmic accuracy and broader chemistry coverage at the cost of larger footprint and firmware dependency.
Availability
BQ2092SN-A309 is available at Aetrix Electronics and suitable for portable medical devices, power tools, smart battery packs, and laptop subsystems requiring stable component supply, long-lifecycle support, and consistent gas gauge performance across temperature and aging conditions.
Supply support for BQ2092SN-A309 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The BQ2092SN-A309 belongs to TI's Smart Battery Fuel Gauge product line, engineered specifically for cost-sensitive, space-constrained battery-pack integration where SMBus compatibility, EEPROM configurability, and self-contained LED display capability are essential.
FAQ
What battery chemistries does the BQ2092SN-A309 support?
The BQ2092SN-A309 supports NiCd, NiMH, and Li-Ion rechargeable battery chemistries. It implements chemistry-specific charge control logic-including ∆T/∆t for nickel-based cells and voltage-based termination for Li-Ion-and stores chemistry identification in EEPROM at DeviceChemistry register (0x22). The BQ2092SN-A309 does not support LiFePO₄ or lead-acid chemistries.
Does the BQ2092SN-A309 require an external EEPROM, and why?
Yes, the BQ2092SN-A309 requires an external EEPROM for proper operation. It stores critical configuration data-including DesignCapacity, EDV1/EDVF thresholds, charging parameters, temperature offsets, and manufacturer information-in external nonvolatile memory. The BQ2092SN-A309 reads this data at power-up via SCL/SDA pins; absence of EEPROM prevents initialization and renders the device nonfunctional.
How does the BQ2092SN-A309 handle self-discharge compensation?
The BQ2092SN-A309 estimates self-discharge based on internal timer and temperature sensor readings, applying a user-programmable rate (0–25%/day at 25°C) stored in EEPROM. The rate doubles per +10°C rise or halves per –10°C drop. This value continuously decrements RemainingCapacity (RM) and increments Discharge Count Register (DCR), ensuring accurate long-term capacity tracking without host polling.
Can the BQ2092SN-A309 operate without a microcontroller host?
Yes, the BQ2092SN-A309 can operate autonomously for basic fuel gauging and LED display. Its internal logic handles coulomb counting, temperature compensation, FCC learning, and SEG1–SEG4 modulation. However, initial EEPROM programming, register configuration (e.g., FLAGS2 for charge control), and alarm threshold setup require a host system during manufacturing or calibration.
What is the function of the DISP pin on the BQ2092SN-A309?
The DISP pin on the BQ2092SN-A309 controls LED display activation: tied high (VCC) disables SEG1–SEG4 outputs; left floating enables automatic activation during charge >100 mA; pulled low triggers a 4-second display pulse. This allows flexible UI implementation-e.g., momentary status check via pushbutton or continuous display during charging-without consuming host GPIO resources.
BQ2092SN-A309 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:
- -
BQ2092SN-A309 FAQ
1.How can I place an order for BQ2092SN-A309 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2092SN-A309 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-A309 reliable?
The price and inventory of BQ2092SN-A309 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2092SN-A309 is usually 5 days.
3.What payment methods are accepted for BQ2092SN-A309?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2092SN-A309 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2092SN-A309?
BQ2092SN-A309 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2092SN-A309 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-A309?
For technical support, including BQ2092SN-A309 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2092SN-A309 requirements.
6.How does Aetrix verify that BQ2092SN-A309 is sourced from the original manufacturer or authorized distributors?
All BQ2092SN-A309 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-A309 meets industry standards.
7.What is the process for return or replacement of BQ2092SN-A309?
All BQ2092SN-A309 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2092SN-A309, 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-A309 part is unused and in its original packaging.
Return procedure for BQ2092SN-A309:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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