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Texas Instruments BQ2084DBT-V150
- Part No.:
- BQ2084DBT-V150
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2084DBT-V150.pdf
- Description:
- IC GAS GAUGE FOR BQ29312 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,606
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Product details
Overview
BQ2084DBT-V150 from Texas Instruments is an SBS v1.1-compliant gas gauge IC for Li-ion and Li-polymer battery packs, featuring a 16-bit delta-sigma ADC for voltage/temperature measurement, a self-calibrating 16-bit integrating converter for coulomb counting (better than 0.65-nVh resolution), integrated flash memory for cell modeling, and SMBus 2-wire interface. It operates in 7.2-V to 14.4-V smart battery systems with the bq29312A AFE.
For engineers reviewing the BQ2084DBT-V150 datasheet, BQ2084DBT-V150 pinout, BQ2084DBT-V150 application, or BQ2084DBT-V150 equivalent, key selection considerations include SBS v1.1 compliance, LED-driven remaining-capacity indication (3–5 segments), programmable EDV-based capacity correction, internal oscillator option (ROSC or XCK1/XCK2), and integration with TI's bq29312A analog front-end for protection and cell balancing.
Technical Context
The BQ2084DBT-V150 implements dual sigma-delta ADCs: one dedicated to high-precision current sensing via SR1/SR2 (±0.25 V input range, <1-µV offset error), and another for simultaneous pack voltage, individual cell voltage (via bq29312A), and temperature (NTC or internal sensor) measurement. Its RISC CPU executes fuel-gauge algorithms including real-time self-discharge compensation and state-of-charge calibration at three programmable EDV thresholds (EDV0–EDV2).
It communicates exclusively over SMBus 2.0 (10–100 kHz slave mode), supports SBS data commands (e.g., RemainingCapacity, FullChargeCapacity, Temperature), and interfaces directly with the bq29312A via dedicated control lines (SCLK, SDATA, EVENT, CLKOUT) and shared power domains (VDDA/VDDD, VSSA/VSSD). The device uses internal 1-kB flash to store nominal capacity, voltage, rate/temperature compensation factors, and learned full-charge capacity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 3.6 V - powers analog (VDDA) and digital (VDDD) domains independently |
| Current Measurement Resolution | Better than 0.65 nVh - enables sub-mAh accuracy in coulomb counting over multi-hour discharge cycles |
| ADC Offset Error | <1 µV (typical) - ensures minimal zero-current drift in charge/discharge accumulation |
| SMBus Frequency | 10–100 kHz - compatible with standard system management bus timing without external clocking |
| Operating Temperature | –20°C to +85°C - validated for notebook PC and portable instrumentation environments |
| Flash Memory | 1 kB data flash - stores user-configurable cell model parameters and learned FCC values across power cycles |
| LED Drive Capability | 5-segment LED outputs (LED1–LED5) - supports visual SOC indication at 20%/25%/33% increments without external drivers |
Pinout & Package
Package: 38-pin TSSOP (DBT), 0.65-mm pitch, RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Analog input | Accepts single-cell voltage from bq29312A for pack/cell voltage measurement |
| SR1 / SR2 | Differential current sense inputs | Monitor voltage drop across external sense resistor (5–30 mΩ) for bidirectional charge/discharge flow |
| TS | Analog temperature input | Connects to NTC thermistor (e.g., Semitec 103AT) or internal temp sensor for thermal compensation |
| SMBD / SMBC | Open-drain SMBus I/O | Bi-directional data and clock lines for SBS v1.1 communication with host controller |
| LED1–LED5 | Push-pull outputs | Drive external LEDs directly for remaining capacity display (3–5 segment modes) |
| CLKOUT | Output | 32.768-kHz clock signal to bq29312A for synchronized timing and protection logic |
| RBI | Backup supply input | Accepts capacitor or battery to retain register state during main supply brownout |
| PRES | Active-low input | Detects battery pack insertion into host system to trigger normal operation and FET enable |
Key Features
| Feature | Design Value |
|---|---|
| SBS v1.1 Compliance | Full support for Smart Battery Data (SBData) commands and charge-control functions required for interoperable smart battery systems |
| Programmable Cell Modeling | Enables accurate fuel gauging across varying load profiles, temperatures, and aging by tuning 12+ flash-stored compensation coefficients |
| Auto-Offset Calibration | Performs <1-µV offset cancellation on SR1/SR2 during 20-s SMBus idle period-no manual calibration needed |
| Integrated Time Base | Internal oscillator (ROSC resistor) or external 32.768-kHz crystal eliminates need for separate timing component |
| LED Delay Function | Configurable display update timing prevents flicker during transient load changes while maintaining real-time SOC visibility |
Applications
| Notebook PCs | Medical and Test Equipment |
|---|---|
Use Scenario: Integrated into removable Li-ion battery packs for Windows/Linux laptops requiring precise runtime estimation and SBS-compliant host communication. IC Role / Device Role / Timing Role: Primary fuel gauge IC managing RemainingCapacity(), FullChargeCapacity(), and Temperature() registers via SMBus; coordinates with bq29312A for cell balancing and protection. Use Value: Delivers <1% error in capacity prediction under dynamic load and temperature variation, extending usable runtime through accurate low-battery warnings and EDV-based RM corrections. | Use Scenario: Embedded in portable diagnostic devices (e.g., ultrasound handhelds, ECG monitors) where battery life impacts clinical workflow and regulatory reporting. IC Role / Device Role / Timing Role: Standalone gas gauge with internal flash storage of calibrated cell models-enables traceable, repeatable capacity reporting across device lifecycle without recalibration. Use Value: Maintains stable SOC accuracy over 500+ charge cycles using learned FCC updates and temperature-compensated EDV thresholds, meeting IEC 62304 Class B software requirements. |
| Portable Instrumentation | Industrial Handheld Terminals |
Use Scenario: Used in battery-powered multimeters, spectrum analyzers, and gas detectors operating in field environments with wide temperature swings (–20°C to +60°C). IC Role / Device Role / Timing Role: Dual-role IC: performs coulomb counting via integrating ADC and provides real-time voltage/temperature telemetry to host MCU via SMBus polling every second. Use Value: Achieves 0.65-nVh current integration resolution and <1% voltage measurement error-critical for correlating battery drain with instrument duty cycle and sensor activation events. | Use Scenario: Deployed in warehouse barcode scanners and ruggedized tablets requiring hot-swappable batteries with LED-based SOC feedback for shift workers. IC Role / Device Role / Timing Role: LED driver + SMBus endpoint: drives 4-segment display (25% increments) and reports RemainingCapacity() to host OS for UI-level battery status rendering. Use Value: Eliminates external LED drivers and EEPROM; reduces BOM count by integrating flash, oscillator, and SMBus PHY-cutting PCB area by ~30% vs discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2085DBT-V150 | Same DBT package and pinout; adds enhanced self-discharge modeling and extended temperature range (–40°C to +85°C) | Required for industrial outdoor deployments where ambient extremes exceed BQ2084DBT-V150's –20°C lower limit | Select when wider temperature qualification and improved long-term shelf-life prediction are mandatory |
| BQ20Z75-V150 | Higher integration: includes embedded 16-bit ADC, 32-bit RISC core, and 2-kB flash; supports SBS v1.1 + extended command set | Targets next-gen smart batteries needing firmware-upgradable gauging algorithms and multi-cell stack monitoring beyond 4 cells | Choose when future-proofing against evolving SBS extensions or adding custom fuel-gauge logic is required |
Compared with BQ2084DBT-V150, BQ2085DBT-V150 offers identical footprint and firmware compatibility but extends cold-temperature operation, while BQ20Z75-V150 replaces the AFE-coupled architecture with monolithic integration-increasing flexibility at the cost of higher BOM cost and design complexity.
Availability
BQ2084DBT-V150 is available at Aetrix Electronics and suitable for notebook PCs, medical diagnostics equipment, portable instrumentation, and industrial handheld terminals requiring stable component supply, long-lifecycle support, and SBS v1.1 certification.
Supply support for BQ2084DBT-V150 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 BQ2084DBT-V150 belongs to TI's Smart Battery Fuel Gauge product line, designed specifically for high-accuracy, low-power coulomb counting in multi-cell Li-ion/Li-polymer battery packs interfacing with AFE protection ICs like the bq29312A.
FAQ
What is the primary function of the BQ2084DBT-V150 in a smart battery system?
The BQ2084DBT-V150 serves as the core SBS v1.1-compliant fuel gauge IC, performing real-time coulomb counting via its 16-bit integrating ADC, compensating for temperature and load effects using programmable cell models stored in 1-kB flash, and reporting RemainingCapacity(), FullChargeCapacity(), and Temperature() over SMBus. It works in tandem with the bq29312A AFE to deliver complete pack-level monitoring and protection for 7.2-V to 14.4-V Li-ion/Li-polymer systems.
Does the BQ2084DBT-V150 require an external crystal oscillator?
No-the BQ2084DBT-V150 supports both internal and external time bases. With a 100-kΩ ±0.1% resistor connected to ROSC (pin 33), it uses its internal oscillator; with a 12-pF 32.768-kHz crystal on XCK1/XCK2 (pins 34/33), it switches to crystal mode. Both configurations meet SBS timing requirements, and only one may be populated-never both.
How does the BQ2084DBT-V150 achieve high-accuracy current measurement?
The BQ2084DBT-V150 achieves high-accuracy current measurement using a self-calibrating 16-bit integrating delta-sigma ADC with better than 0.65-nVh resolution and <1-µV typical offset error. It continuously samples the differential voltage across the SR1/SR2 pins (±0.25 V range), auto-calibrates offset during 20-s SMBus idle periods, and applies temperature- and rate-compensated corrections stored in flash to maintain <1% capacity prediction error across operating conditions.
Can the BQ2084DBT-V150 operate without the bq29312A analog front-end?
No-the BQ2084DBT-V150 is architecturally designed to pair with the bq29312A AFE. It relies on the bq29312A for cell voltage multiplexing (feeding VIN), FET drive control (PCH, DISCHG, PRECHG), and safety protection (OV/UV/OC). While VIN, TS, and SR1/SR2 connect directly to the battery, critical functions like cell balancing, pack voltage scaling, and fault signaling depend on the bq29312A interface signals (CLKOUT, EVENT, SCLK, SDATA).
What is the role of the RBI pin on the BQ2084DBT-V150?
The RBI (Register Backup Input) pin on the BQ2084DBT-V150 provides a backup power path to retain volatile register contents-including RemainingCapacity(), FullChargeCapacity(), and configuration settings-during main supply (VDDA/VDDD) brownout or removal. When VDD drops below the power-on reset threshold (~2.3 V), the RBI pin (biased ≥1.3 V) sustains the internal SRAM and flash controller, ensuring no loss of learned capacity or calibration state across hot-swap events.
BQ2084DBT-V150 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 2 ~ 4
- Fault Protection:
- -
- Interface:
- SMBus
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP
BQ2084DBT-V150 FAQ
1.How can I place an order for BQ2084DBT-V150 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2084DBT-V150 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 BQ2084DBT-V150 reliable?
The price and inventory of BQ2084DBT-V150 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2084DBT-V150 is usually 5 days.
3.What payment methods are accepted for BQ2084DBT-V150?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2084DBT-V150 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2084DBT-V150?
BQ2084DBT-V150 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2084DBT-V150 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 BQ2084DBT-V150?
For technical support, including BQ2084DBT-V150 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2084DBT-V150 requirements.
6.How does Aetrix verify that BQ2084DBT-V150 is sourced from the original manufacturer or authorized distributors?
All BQ2084DBT-V150 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 BQ2084DBT-V150 meets industry standards.
7.What is the process for return or replacement of BQ2084DBT-V150?
All BQ2084DBT-V150 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2084DBT-V150, 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 BQ2084DBT-V150 part is unused and in its original packaging.
Return procedure for BQ2084DBT-V150:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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