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Texas Instruments BQ2084DBTR-V140
- Part No.:
- BQ2084DBTR-V140
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2084DBTR-V140.pdf
- Description:
- IC GAS GAUGE FOR BQ29312 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,798
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Product details
Overview
BQ2084DBTR-V140 from Texas Instruments is an SBS v1.1-compliant gas gauge IC designed for Li-ion and Li-polymer battery packs, featuring a 16-bit delta-sigma integrating ADC for current measurement (better than 0.65-nVh resolution), integrated 1-kB flash memory for programmable cell modeling, and SMBus 2-wire interface. It operates with the bq29312 analog front-end to deliver complete smart battery electronics for 7.2-V, 10.8-V, or 14.4-V systems in notebook PCs and portable instrumentation.
For engineers reviewing the BQ2084DBTR-V140 datasheet, BQ2084DBTR-V140 pinout, BQ2084DBTR-V140 application, or BQ2084DBTR-V140 equivalent, this page delivers verified technical context on coulomb counting accuracy, LED-driven state-of-charge indication, self-calibrating offset error (<1 µV), Smart Battery Data (SBData) command support, and integration requirements with the bq29312 AFE - all critical for battery management system validation and production design-in.
Technical Context
The BQ2084DBTR-V140 implements a low-power RISC CPU core with dedicated peripherals for real-time battery parameter tracking, including continuous sampling via self-calibrating integrating ADC for charge/discharge current, and dual 16-bit sigma-delta converters for voltage and temperature measurement. It supports SBS v1.1 register mapping and communicates exclusively over SMBus 2-wire protocol at up to 100 kHz.
Its architecture relies on tight coupling with the bq29312 AFE: SR1/SR2 sense resistor inputs feed the integrating ADC; VIN receives scaled cell voltages from the AFE; CLKOUT (32.768 kHz) synchronizes timing; and SAFE, EVENT, PFIN, and PRES pins enable coordinated protection and insertion detection. The device performs voltage-based RM corrections at EDV0/EDV1/EDV2 thresholds and learns full-charge capacity (FCC) during qualified discharges.
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 separately; ensures stable operation across –20°C to 85°C ambient. |
| Current Measurement ADC | Better than 0.65-nVh resolution, <1-µV offset error - enables sub-mAh coulomb counting accuracy without external calibration. |
| SMBus Interface | 10–100 kHz slave mode - compliant with SBS v1.1; supports SBData commands for RemainingCapacity(), Voltage(), Temperature(), and Current(). |
| Flash Memory | 1-kB internal data flash - stores nominal capacity, self-discharge rate, rate/temperature compensation factors, and learned FCC values for runtime fuel gauge adaptation. |
| LED Drive Capability | 5-segment LED output (LED1–LED5) - drives external LEDs in 20%/25%/33% SOC increments; eliminates need for external display controller. |
| Operating Temperature | –20°C to +85°C - validated for industrial and portable computing environments; thermal compensation applied to self-discharge and EDV thresholds. |
| Package | 38-pin TSSOP (DBT) - surface-mount footprint with exposed thermal pad; pin-compatible with bq2084RTT-V140 QFN variant only at functional level, not mechanical. |
Pinout & Package
Package: 38-pin Thin Shrink Small Outline Package (TSSOP, DBT), 0.65-mm pitch, 12.5 mm × 6.1 mm body size, with exposed thermal pad for enhanced power dissipation in battery pack PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SR1 / SR2 | Sense resistor differential input | Measures bipolar current flow (±0.25 V range); enables coulomb counting with <1-µV auto-calibrated offset. |
| VIN | Cell voltage input | Receives scaled individual cell or pack voltage from bq29312 AFE; used for voltage-based RM correction and EDV threshold detection. |
| TS | Thermistor voltage input | Supports NTC thermistors (e.g., Semitec 103AT) or internal temperature sensor; feeds temperature-compensated self-discharge and FCC learning. |
| SMBD / SMBC | SMBus bidirectional data/clock | Open-drain I/O; implements SBS v1.1 communication with host controller for real-time battery status reporting. |
| LED1–LED5 | LED segment drivers | Push-pull outputs capable of 10 mA sink; drive discrete LEDs for visual SOC indication without external drivers. |
| PRES | System insertion sense | Active-low input detects battery pack insertion; triggers normal operation and FET control within 250 ms. |
| SAFE | Safety protection output | Active-low signal for secondary fuse blow or hardware shutdown; provides additional layer beyond bq29312 protection logic. |
Key Features
| Feature | Design Value |
|---|---|
| SBS v1.1 Compliance | Fully implements Smart Battery Data register map and charge-control functions - enables plug-and-play integration with SBS-compliant hosts like notebook EC firmware. |
| Self-Calibrating Integrating ADC | Auto-nulls SR1/SR2 offset to <1 µV during 20-s SMBus idle - eliminates manual calibration steps and maintains long-term coulomb counting accuracy. |
| Programmable Cell Modeling | Adjusts remaining capacity using user-defined rate, temperature, and time compensation factors stored in flash - improves fuel gauge accuracy across diverse usage profiles. |
| Integrated Time Base | On-chip 32.768-kHz oscillator (with ROSC resistor or crystal option) - removes need for external crystal while supporting precise timing for 1-s parameter updates. |
| LED-Based SOC Indication | Configurable 3-/4-/5-segment display with 20%/25%/33% increments - delivers intuitive, low-cost battery status feedback without MCU intervention. |
Applications
| Notebook PC Battery Management | Medical Portable Diagnostic Device |
|---|---|
Use Scenario: Integrated into removable Li-ion battery packs for Windows/Linux laptops requiring accurate runtime prediction and SBS-compliant host communication. IC Role / Device Role / Timing Role: Primary gas gauge IC performing real-time coulomb counting, voltage/temperature monitoring, and SMBus reporting to EC; synchronizes with bq29312 AFE via CLKOUT and SDATA/SCLK. Use Value: Delivers <1% capacity prediction error across discharge cycles by combining learned FCC, EDV-based RM correction, and temperature-compensated self-discharge modeling. |
Use Scenario: Embedded in sealed, rechargeable battery modules for handheld ultrasound or blood glucose analyzers where safety certification and runtime reliability are critical. IC Role / Device Role / Timing Role: Standalone fuel gauge managing charge/discharge logging, low-voltage cutoff (EDV2), and LED-based battery status - operates independently of host processor during standby. Use Value: Enables FDA-aligned battery safety through SAFE output assertion, PRES-triggered FET control, and programmable overload current thresholds that halt charging above 3C/32. |
| Industrial Handheld Test Equipment | Portable Data Acquisition System |
Use Scenario: Used in ruggedized multimeters or oscilloscopes with hot-swappable battery packs needing precise capacity tracking under variable load and temperature conditions. IC Role / Device Role / Timing Role: Core battery parameter engine interfacing with bq29312 for cell balancing and protection; reports Voltage(), Current(), and Temperature() every second via SMBus. Use Value: Maintains ±0.65-nVh current integration resolution across –20°C to 85°C, enabling consistent mAh accuracy even during rapid load transients and thermal cycling. |
Use Scenario: Deployed in field-deployable environmental sensors powered by Li-polymer batteries, requiring multi-year operation with minimal maintenance and predictable end-of-life alerts. IC Role / Device Role / Timing Role: Fuel gauge executing autonomous FCC learning during field discharges, storing learned parameters in 1-kB flash, and triggering low-battery warnings via LED1–LED5 before EDV0. Use Value: Extends usable battery life by 8–12% through adaptive self-discharge modeling and mid-range voltage corrections (VOC25/VOC50/VOC75) that prevent premature shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar smart battery gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2085DBTR-V140 | Same DBT package and pinout; adds enhanced EEPROM emulation and extended data flash (2 kB); identical SMBus register map and AFE interface. | Preferred for designs requiring longer-term parameter retention across >100k write cycles or deeper customization of learning algorithms. | Select BQ2085DBTR-V140 when future firmware updates or extended calibration history storage are required; otherwise, BQ2084DBTR-V140 remains optimal for cost-sensitive SBS v1.1 implementations. |
| BQ20Z75-V140 | QFN-48 package; integrates 16-bit ADC, 32-bit RISC core, and expanded SBS v1.1+ features (e.g., cycle count, lifetime data logging); no LED drivers. | Targets high-end notebooks and enterprise tablets needing advanced battery analytics, not basic SOC indication. | Choose BQ20Z75-V140 only if cycle-count tracking, secure authentication, or lifetime data logging are mandatory; BQ2084DBTR-V140 suffices for standard SBS compliance with LED feedback. |
Compared with BQ2084DBTR-V140, the BQ2085DBTR-V140 offers doubled flash endurance without layout changes, while the BQ20Z75-V140 trades LED simplicity for enterprise-grade telemetry - making BQ2084DBTR-V140 the most balanced choice for cost-constrained, SBS v1.1–compliant portable systems requiring visual SOC feedback.
Availability
BQ2084DBTR-V140 is available at Aetrix Electronics and suitable for notebook PC battery packs, medical portable diagnostics, industrial handheld test equipment, and portable data acquisition systems requiring stable component supply, long-lifecycle support, and SBS v1.1 interoperability.
Supply support for BQ2084DBTR-V140 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 ICs and industrial-grade reliability.
The BQ2084DBTR-V140 belongs to TI's Smart Battery Gas Gauge product line, engineered specifically for SBS v1.1–compliant Li-ion/Li-polymer battery packs in portable computing and portable instrumentation - emphasizing accuracy, low-power operation, and seamless AFE co-design with the bq29312.
FAQ
What is the primary function of the BQ2084DBTR-V140 in a smart battery system?
The BQ2084DBTR-V140 serves as the core SBS v1.1-compliant gas gauge IC, performing real-time coulomb counting via its self-calibrating integrating ADC, monitoring voltage and temperature, and reporting RemainingCapacity(), Current(), and Temperature() over SMBus. It works in tandem with the bq29312 AFE to deliver complete pack-level intelligence - making the BQ2084DBTR-V140 essential for accurate runtime estimation and safe battery operation.
Does the BQ2084DBTR-V140 require an external crystal, or does it have an internal oscillator?
The BQ2084DBTR-V140 supports both internal and external clock sources: it can use either a 100-kΩ precision resistor on ROSC (pin 33) for internal oscillator operation or a 32.768-kHz crystal between XCK1/XCK2 (pins 34/33). Only one source should be populated - not both - and the internal oscillator achieves ±2% frequency error with proper resistor placement and tolerance (±0.1%, ±50 ppm).
How does the BQ2084DBTR-V140 achieve accurate fuel gauging across temperature and usage conditions?
The BQ2084DBTR-V140 achieves accuracy through three mechanisms: (1) auto-calibration of SR1/SR2 offset to <1 µV, (2) programmable cell modeling using flash-stored rate/temperature compensation factors, and (3) voltage-based RM corrections at EDV0/EDV1/EDV2 thresholds. These features collectively maintain <1% capacity prediction error across –20°C to 85°C and varying discharge profiles - a key capability of the BQ2084DBTR-V140.
Can the BQ2084DBTR-V140 operate without the bq29312 analog front-end?
No - the BQ2084DBTR-V140 is architecturally dependent on the bq29312 AFE for critical functions: cell voltage scaling (fed to VIN), protection signaling (via EVENT, SAFE, PFIN), clock synchronization (CLKOUT), and serial communication (SDATA/SCLK). While the BQ2084DBTR-V140 handles computation and SMBus interface, the bq29312 provides analog sensing, FET control, and safety enforcement - making them a co-designed pair.
What is the role of the RBI pin on the BQ2084DBTR-V140, and how is it used?
The RBI (Register Backup Input) pin on the BQ2084DBTR-V140 provides backup power to retain flash and RAM contents during main supply brownout. It accepts either a storage capacitor or small backup battery (≥1.3 V), drawing ≤100 nA when VDD drops below the power-on reset threshold. This ensures critical battery parameters - including learned FCC and configuration settings - survive temporary power loss, preserving BQ2084DBTR-V140 operational integrity.
BQ2084DBTR-V140 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
BQ2084DBTR-V140 FAQ
1.How can I place an order for BQ2084DBTR-V140 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2084DBTR-V140 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-V140 reliable?
The price and inventory of BQ2084DBTR-V140 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2084DBTR-V140 is usually 5 days.
3.What payment methods are accepted for BQ2084DBTR-V140?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2084DBTR-V140 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2084DBTR-V140?
BQ2084DBTR-V140 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2084DBTR-V140 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-V140?
For technical support, including BQ2084DBTR-V140 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2084DBTR-V140 requirements.
6.How does Aetrix verify that BQ2084DBTR-V140 is sourced from the original manufacturer or authorized distributors?
All BQ2084DBTR-V140 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-V140 meets industry standards.
7.What is the process for return or replacement of BQ2084DBTR-V140?
All BQ2084DBTR-V140 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2084DBTR-V140, 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-V140 part is unused and in its original packaging.
Return procedure for BQ2084DBTR-V140:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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