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Texas Instruments BQ2084DBTR-V142
- Part No.:
- BQ2084DBTR-V142
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- -
- Datasheet:
-
BQ2084DBTR-V142.pdf
- Description:
- IC BATT MGMT ANALOG
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Product details
Overview
BQ2084DBTR-V142 from Texas Instruments is a Smart Battery Specification (SBS) v1.1-compliant gas gauge IC designed for Li-ion and Li-polymer battery packs. It performs coulomb counting with better than 0.65-nVh resolution, integrates a 16-bit delta-sigma ADC for voltage/temperature measurement, supports SMBus 2-wire communication, and operates with the bq29312 analog front-end to enable full pack protection and cell balancing in 7.2-V, 10.8-V, or 14.4-V systems.
For engineers reviewing the BQ2084DBTR-V142 datasheet, BQ2084DBTR-V142 pinout, BQ2084DBTR-V142 application, or BQ2084DBTR-V142 equivalent, key selection considerations include its self-calibrating integrating current converter, programmable cell modeling for fuel gauge accuracy, integrated flash memory for configuration storage, LED driver support for 3–5 segment displays, and compatibility with TI's bq29312 AFE for safety-critical battery management.
Technical Context
The BQ2084DBTR-V142 implements a low-power RISC CPU core with dedicated peripherals for battery monitoring, including an integrating ADC for charge/discharge current sensing and a separate 16-bit delta-sigma ADC for voltage and temperature acquisition. It interfaces directly with the bq29312 AFE via dedicated control lines (SCLK, SDATA, CLKOUT, EVENT) and SMBus for host communication.
Its gas gauge algorithm uses real-time compensation for temperature, discharge rate, and self-discharge, updating RemainingCapacity() every second and supporting FCC learning through qualified discharge cycles. The device supports both external 32.768-kHz crystal and internal resistor-based oscillator (ROSC), with auto-offset calibration <1 µV on SR1/SR2 inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 3.6 V - powers analog (VDDA/VSSA) and digital (VDDD/VSSD) domains independently |
| Current Measurement | Better than 0.65-nVh resolution integrating converter - enables precise coulomb counting over full discharge cycle |
| ADC Resolution | 16-bit delta-sigma - provides accurate voltage (pack/cell) and temperature reporting with <1% error |
| SMBus Interface | 10–100 kHz slave mode - compliant with SBS v1.1 for standardized battery data exchange with host controller |
| Operating Temperature | –20°C to +85°C - validated for notebook PC, medical equipment, and portable instrumentation environments |
| Flash Memory | 1 kBytes internal data flash - stores nominal capacity, self-discharge rate, cell model parameters, and learned FCC |
| LED Drivers | 5-channel open-drain outputs (LED1–LED5) - supports 3-, 4-, or 5-segment display for remaining capacity indication |
Pinout & Package
Package: 38-pin TSSOP (DBT), RoHS-compliant, surface-mount, 9.7 mm × 4.4 mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SR1 / SR2 | Current sense differential input | Measures bipolar voltage across sense resistor (–0.25 V to +0.25 V); enables coulomb counting with <1-µV offset error |
| VIN | Analog voltage input | Receives scaled cell/pack voltage from bq29312 AFE; used for Voltage(), VCELLx(), and EDV threshold detection |
| TS | Temperature sensor input | Accepts NTC thermistor (e.g., Semitec 103AT) or internal sensor; enables temperature-compensated capacity estimation |
| SMBD / SMBC | SMBus bidirectional data/clock | Standardized 2-wire interface for SBS commands (RemainingCapacity, Temperature, AtRate, PackStatus, etc.) |
| LED1–LED5 | Open-drain LED drivers | Each drives one segment of 3–5 LED display; supports 20%/25%/33% capacity increment indication |
| CLKOUT | 32.768-kHz clock output | Drives bq29312 timing; synchronizes AFE and gas gauge operations without external crystal |
| RBI | Register backup input | Accepts capacitor or battery backup to retain flash and RAM during VDD dropout; ensures data integrity |
| PRES | System insertion detection | Active-low input signals pack insertion; triggers FET turn-on within 250 ms and sets PRES bit in PackStatus() |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating integrating ADC | Automatically cancels SR1/SR2 offset (<1 µV) during 20-s SMBus idle - eliminates manual calibration and improves long-term fuel gauge accuracy |
| Programmable cell modeling | Adjusts capacity prediction using user-defined factors for time, rate, and temperature stored in flash - enables chemistry-specific fuel gauge tuning |
| Qualified discharge learning | Updates FullChargeCapacity() only after verified discharge from near-full to EDV2 with controlled conditions - prevents FCC drift from partial cycles |
| EDV-based RM correction | Applies voltage-triggered state-of-charge corrections at EDV0 (0%), EDV1 (3%), EDV2 (Battery Low %) - enhances low-SOC accuracy without relying solely on coulomb count |
| Integrated oscillator options | Supports either 32.768-kHz crystal (XCK1/XCK2) or 100-kΩ ROSC resistor - reduces BOM count and layout sensitivity vs. external crystal solutions |
Applications
| Notebook PC Battery Management | Medical Portable Device Power |
|---|---|
Use Scenario: Integrated smart battery pack in ultraportable laptops requiring precise runtime prediction and safe charge/discharge control. IC Role / Device Role / Timing Role: Primary SBS v1.1 gas gauge IC; performs real-time coulomb counting, cell voltage monitoring, and SMBus reporting to EC/OS. Use Value: Enables >99% accurate remaining runtime estimation and supports Windows ACPI battery interface via standardized SBS registers. |
Use Scenario: Rechargeable battery system in handheld diagnostic equipment where safety certification and capacity consistency are critical. IC Role / Device Role / Timing Role: Core fuel gauge and safety coordinator working with bq29312 AFE; manages EDV thresholds, cell balancing, and thermal derating. Use Value: Meets IEC 62368-1 requirements via dual-level protection (AFE + SAFE output) and maintains <1% capacity error across temperature range. |
| Industrial Handheld Instrumentation | Test & Measurement Equipment |
Use Scenario: Field-deployable multimeter or spectrum analyzer with hot-swappable Li-ion battery packs. IC Role / Device Role / Timing Role: Gas gauge and system interface controller; handles PRES detection, LED status display, and SMBus host queries. Use Value: Provides instant pack presence recognition and 5-segment LED capacity feedback without host polling overhead. |
Use Scenario: Benchtop power analyzer or oscilloscope requiring stable, traceable battery capacity reporting for calibration logs. IC Role / Device Role / Timing Role: High-accuracy coulomb counter with flash-stored calibration data; reports Current(), AverageCurrent(), and Temperature() via SMBus. Use Value: Delivers repeatable mAh measurements with <0.65-nVh resolution and auto-offset calibration - essential for metrology-grade logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2084RTTR-V142 | Same die, 36-pin QFN (RTT) package - smaller footprint (6 mm × 6 mm), no leaded pins, higher thermal conductivity | Preferred for space-constrained designs; requires rework of PCB layout and thermal pad design | Select when board area is limited and reflow profile supports QFN; not pin-compatible with DBT |
| BQ2085DBTR-V142 | Enhanced firmware version with extended data flash (2 kB), added SBS v1.2 features, and improved EDV compensation algorithms | Supports newer host OS versions requiring extended SBS command sets; retains same pinout and electrical specs | Choose for new designs needing future-proofing and enhanced learning accuracy; drop-in replacement for BQ2084DBTR-V142 |
Compared with BQ2084DBTR-V142, the BQ2084RTTR-V142 offers identical functionality in a compact QFN package but requires PCB redesign, while the BQ2085DBTR-V142 delivers firmware-upgraded gas gauging with full pin-to-pin compatibility and extended flash for advanced modeling - making it the preferred upgrade path for production continuity.
Availability
BQ2084DBTR-V142 is available at Aetrix Electronics and suitable for notebook PCs, medical portable devices, industrial handheld instrumentation, test & measurement equipment, and portable instrumentation requiring stable component supply, long-lifecycle support, and SBS v1.1 compliance.
Supply support for BQ2084DBTR-V142 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 experience in battery management ICs.
The BQ2084DBTR-V142 belongs to TI's Smart Battery Fuel Gauge product line, engineered specifically for high-accuracy Li-ion/Li-polymer capacity tracking in portable systems requiring SBS v1.1 compliance and seamless integration with TI's AFE portfolio.
FAQ
What is the primary function of the BQ2084DBTR-V142 in a battery pack?
The BQ2084DBTR-V142 serves as a Smart Battery Specification (SBS) v1.1-compliant gas gauge IC that accurately measures and reports remaining battery capacity, voltage, temperature, current, and runtime predictions. It performs coulomb counting using a self-calibrating integrating ADC and works in tandem with the bq29312 AFE to deliver complete pack-level monitoring and protection. Its role is central to enabling intelligent power management in systems like notebooks and medical devices.
Does the BQ2084DBTR-V142 require an external crystal oscillator?
No, the BQ2084DBTR-V142 does not require an external crystal oscillator. It supports two timing options: an internal oscillator using a 100-kΩ resistor on the ROSC pin (XCK2), or an external 32.768-kHz crystal connected to XCK1/XCK2. The device automatically selects the active source at power-up. When using the internal option, a ±0.1% tolerance, ±50 ppm resistor is recommended for optimal accuracy - eliminating crystal cost and layout complexity.
How does the BQ2084DBTR-V142 achieve high fuel gauge accuracy?
The BQ2084DBTR-V142 achieves high fuel gauge accuracy through multiple coordinated mechanisms: a self-calibrating integrating ADC with <1-µV offset error on SR1/SR2, 16-bit delta-sigma conversion for voltage/temperature, programmable cell modeling stored in 1-kB flash, and voltage-based corrections at three EDV thresholds (EDV0/EDV1/EDV2). It also learns true full-charge capacity via qualified discharge cycles and compensates for temperature, rate, and self-discharge in real time - delivering <1% capacity error in validated use cases.
Can the BQ2084DBTR-V142 operate without the bq29312 AFE?
No, the BQ2084DBTR-V142 is designed to operate exclusively with the bq29312 AFE. It relies on the bq29312 for critical functions including cell voltage multiplexing (fed to VIN), protection signaling (via EVENT, SAFE, PFIN), pre-charge/FET control, and thermistor biasing. The BQ2084DBTR-V142 lacks internal high-voltage switches, cell voltage ADCs, or protection logic - its architecture assumes tight coupling with the bq29312 for complete pack electronics functionality.
What communication interface does the BQ2084DBTR-V142 use to report battery data?
The BQ2084DBTR-V142 uses the System Management Bus (SMBus) 2-wire protocol in slave mode to report battery data. It supports standard SBS v1.1 commands including RemainingCapacity(), Voltage(), Temperature(), Current(), AverageCurrent(), AtRate(), PackStatus(), and manufacturer-specific extensions. Communication occurs at 10–100 kHz, with built-in timing compliance per SMBus specification - enabling direct interoperability with host controllers in notebooks, medical devices, and industrial systems.
BQ2084DBTR-V142 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:
- -
BQ2084DBTR-V142 FAQ
1.How can I place an order for BQ2084DBTR-V142 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2084DBTR-V142 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 BQ2084DBTR-V142 reliable?
The price and inventory of BQ2084DBTR-V142 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2084DBTR-V142 is usually 5 days.
3.What payment methods are accepted for BQ2084DBTR-V142?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2084DBTR-V142 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2084DBTR-V142?
BQ2084DBTR-V142 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2084DBTR-V142 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 BQ2084DBTR-V142?
For technical support, including BQ2084DBTR-V142 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2084DBTR-V142 requirements.
6.How does Aetrix verify that BQ2084DBTR-V142 is sourced from the original manufacturer or authorized distributors?
All BQ2084DBTR-V142 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 BQ2084DBTR-V142 meets industry standards.
7.What is the process for return or replacement of BQ2084DBTR-V142?
All BQ2084DBTR-V142 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2084DBTR-V142, 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 BQ2084DBTR-V142 part is unused and in its original packaging.
Return procedure for BQ2084DBTR-V142:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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