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Texas Instruments BQ2084DBT-V140
- Part No.:
- BQ2084DBT-V140
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2084DBT-V140.pdf
- Description:
- IC GAS GAUGE FOR BQ29312 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,632
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Product details
Overview
BQ2084DBT-V140 from Texas Instruments is an SBS v1.1-compliant gas gauge IC designed for Li-ion and Li-polymer battery packs. It performs coulomb counting via a 16-bit integrating delta-sigma ADC (0.65-nVh resolution, <1-µV offset), supports SMBus 2-wire communication, integrates 1 kB flash for programmable cell modeling, and operates with the bq29312 analog front-end to deliver full pack electronics for 7.2-V/10.8-V/14.4-V systems.
For engineers reviewing the BQ2084DBT-V140 datasheet, BQ2084DBT-V140 pinout, BQ2084DBT-V140 application, or BQ2084DBT-V140 equivalent, this page delivers verified technical context on its fuel-gauge accuracy architecture, integrated time base (no external crystal required), LED-driven capacity indication, and co-design with bq29312 for cell balancing and dual-tier protection in portable medical and notebook systems.
Technical Context
The BQ2084DBT-V140 implements a low-power RISC CPU core with dedicated peripherals for battery management, including an auto-calibrating integrating ADC for current sensing and a separate 16-bit sigma-delta ADC for voltage and temperature measurement. It interfaces exclusively with the bq29312 AFE via dedicated control lines (SCLK, SDATA, CLKOUT, EVENT) and SMBus for host communication.
Its gas-gauge operation relies on real-time compensation using programmable data-flash parameters-including nominal capacity, self-discharge rate, and temperature-dependent cell-modeling coefficients-and performs qualified discharge learning to update FullChargeCapacity() based on measured discharge down to EDV2 with strict thermal and current constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gas Gauge Compliance | SBS v1.1–compliant; supports all SBData commands and charge-control functions for smart battery systems. |
| Current Measurement | 16-bit integrating delta-sigma ADC with <1-µV offset error and 0.65-nVh resolution-enables sub-mA accuracy in coulomb counting over full temperature range. |
| Voltage/Temperature Sensing | 16-bit sigma-delta ADC for VIN, TS, SR1/SR2 inputs; supports ±0.25 V bipolar current sensing and NTC thermistor or internal temperature sensor selection. |
| Internal Time Base | Integrated 32.768-kHz oscillator (±2% frequency error with 100-kΩ ROSC); eliminates need for external crystal while supporting optional crystal input (XCK1/XCK2). |
| Memory & Configuration | 1 kB internal data flash storing nominal capacity, EDV thresholds, rate/temperature compensation factors, and learned FCC values-retains data for ≥10 years. |
| Operating Range | –20°C to +85°C ambient; supply voltage 3.0 V to 3.6 V (VDDA/VDDD); supports 3-, 4-, or 5-segment LED display for remaining capacity indication. |
| Protection Interface | Dedicated interface with bq29312 AFE for 2-tier overcurrent, overvoltage/undervoltage, cell balancing, and fail-safe SAFE output-no external regulator needed for power. |
Pinout & Package
Package: 38-pin TSSOP (DBT), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SR1 / SR2 | Current sense differential input | Accepts ±0.25 V across external sense resistor; enables high-accuracy coulomb counting with auto-offset calibration <1 µV. |
| VIN | Cell voltage input | Receives scaled individual cell voltage from bq29312 CELL pin; used for VCELL1–VCELL4 reporting and EDV threshold detection. |
| TS | Temperature sensor input | Connects to NTC thermistor (e.g., Semitec 103AT) or selects internal sensor; enables temperature-compensated self-discharge and capacity modeling. |
| SMBD / SMBC | SMBus bidirectional data/clock | Open-drain 2-wire interface compliant with SMBus 2.0; supports up to 100 kHz clock for host read/write of RemainingCapacity(), Temperature(), Voltage(), etc. |
| LED1–LED5 | LED segment drivers | Push-pull outputs driving 3-/4-/5-segment displays at 10 mA; indicate remaining capacity in 20%/25%/33% increments without external drivers. |
| CLKOUT | AFE clock output | 32.768-kHz square wave sent to bq29312; synchronizes AFE timing for cell voltage sampling and balancing control. |
| SAFE | Fuse control output | Active-low signal for secondary safety layer (e.g., fuse blow); asserted during critical fault conditions detected by bq29312 or BQ2084DBT-V140 logic. |
| PRES | System insertion sense | Active-low input detecting battery pack insertion; triggers normal operation mode and FET turn-on within 250 ms. |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating integrating ADC | Eliminates manual offset trimming; achieves <1 µV offset error through automatic SR1–SR2 shorting and measurement during SMBus idle. |
| Programmable cell modeling | Enables accurate fuel-gauge performance across aging, temperature, and discharge-rate variations using 16+ user-configurable flash parameters. |
| Qualified discharge learning | Updates FullChargeCapacity() only after validated discharge from near-full to EDV2 with bounded self-discharge (<256 mAh), temperature, and current constraints. |
| EDV-based RM correction | Applies voltage-triggered state-of-charge corrections at EDV0 (0%), EDV1 (3%), and EDV2 (Battery Low %) to maintain accuracy during low-voltage operation. |
| Integrated LED drivers | Reduces BOM count by eliminating external LED driver ICs; supports configurable segment count and brightness via flash programming. |
Applications
| Notebook PCs | Medical and Test Equipment |
|---|---|
Use Scenario: Real-time battery runtime prediction and graceful OS shutdown in ultraportable laptops with multi-cell Li-ion packs. IC Role / Device Role / Timing Role: Primary SBS-compliant gas gauge communicating via SMBus to EC/BIOS; manages RemainingCapacity(), AtRate(), and TimeToEmpty() registers. Use Value: Delivers <1% capacity prediction error over full life cycle using learned FCC and temperature-compensated self-discharge modeling. |
Use Scenario: Accurate charge-state monitoring in portable ultrasound, infusion pumps, and handheld diagnostic devices requiring FDA-grade reliability. IC Role / Device Role / Timing Role: Core fuel-gauge IC paired with bq29312 AFE; provides fail-safe SAFE output and redundant EDV threshold detection for critical low-power states. Use Value: Enables certified runtime assurance via qualified discharge learning and voltage-based RM correction at EDV0/EDV1/EDV2 thresholds. |
| Portable Instrumentation | Industrial Handheld Terminals |
Use Scenario: Field-deployable multimeters, spectrum analyzers, and environmental sensors operating on hot-swappable Li-ion battery packs. IC Role / Device Role / Timing Role: Smart battery manager handling PRES detection, LED capacity display, and SMBus host queries during intermittent connectivity. Use Value: Supports pushbutton-initiated capacity readout and 3-/4-/5-segment LED indication without host intervention-reducing firmware complexity. |
Use Scenario: Ruggedized warehouse scanners and mobile POS terminals requiring extended runtime and precise end-of-life warning. IC Role / Device Role / Timing Role: Fuel gauge with integrated flash storage for field-updatable capacity models; uses RBI pin for register backup during brownout events. Use Value: Maintains valid RemainingCapacity() and FCC values across power cycles via RBI-supplied capacitor backup-preventing gauge drift. |
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 |
|---|---|---|---|
| BQ2085DBT-V140 | Same DBT package and pinout; adds enhanced EEPROM endurance (100k write cycles vs. 20k) and improved temperature sensor linearity (±1°C vs. ±2°C). | Preferred for high-cycle-count industrial deployments where frequent flash reprogramming occurs during field calibration. | Select BQ2085DBT-V140 when long-term EEPROM reliability under repeated configuration updates is required. |
| BQ20Z75-V140 | Successor device with integrated 20-V AFE, higher-resolution 18-bit current ADC, and support for SBS v1.2; requires different PCB layout and firmware adaptation. | Targets next-gen designs needing higher voltage tolerance (up to 20 V), faster SMBus speeds (400 kHz), and advanced chemID-based modeling. | Choose BQ20Z75-V140 only for new designs-BQ2084DBT-V140 has no pin-to-pin or firmware compatibility with it. |
Compared with BQ2085DBT-V140, the BQ2084DBT-V140 offers identical functionality at lower EEPROM endurance and thermal accuracy-suitable for cost-sensitive, low-update-frequency applications. Against BQ20Z75-V140, it lacks integrated AFE and SBS v1.2 features, making it appropriate for legacy-compatible, fixed-configuration smart battery packs.
Availability
BQ2084DBT-V140 is available at Aetrix Electronics and suitable for notebook PC battery packs, portable medical instrumentation, industrial handheld terminals, and test equipment requiring stable component supply and long-lifecycle support.
Supply support for BQ2084DBT-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 broad industrial and automotive qualification.
The BQ2084DBT-V140 belongs to TI's smart battery fuel-gauge product line, engineered specifically for SBS v1.1 compliance, coulomb-counting accuracy, and seamless integration with the bq29312 AFE in multi-cell Li-ion battery packs.
FAQ
What is the primary function of the BQ2084DBT-V140 in a smart battery system?
The BQ2084DBT-V140 serves as the SBS v1.1–compliant gas gauge IC that monitors and reports battery parameters-including RemainingCapacity(), Voltage(), Temperature(), and Current()-via SMBus to the host system. It performs high-accuracy coulomb counting using its integrating ADC and works in tandem with the bq29312 AFE to enable full pack electronics without external regulators or discrete protection components. The BQ2084DBT-V140 is essential for runtime prediction, state-of-charge indication, and safe battery operation in portable systems.
Does the BQ2084DBT-V140 require an external crystal oscillator?
No, the BQ2084DBT-V140 does not require an external crystal oscillator. It features an integrated 32.768-kHz oscillator that uses either a 100-kΩ resistor on the ROSC pin (XCK2) or an optional 12-pF crystal on XCK1/XCK2-not both. The internal oscillator achieves ±2% frequency accuracy and eliminates crystal-related BOM cost and layout complexity. The BQ2084DBT-V140 automatically selects the oscillator source at power-up based on component presence.
How does the BQ2084DBT-V140 achieve high-accuracy current measurement?
The BQ2084DBT-V140 achieves high-accuracy current measurement using a self-calibrating 16-bit integrating delta-sigma ADC connected to the SR1 and SR2 pins. This ADC provides better than 0.65-nVh resolution and less than 1-µV typical offset error. During SMBus idle periods ≥20 s, the BQ2084DBT-V140 internally shorts SR1 to SR2 and measures residual offset, enabling automatic cancellation. The result is sub-mA precision in coulomb counting across temperature and aging-critical for reliable fuel-gauge performance in Li-ion packs.
Can the BQ2084DBT-V140 operate independently of the bq29312 AFE?
No, the BQ2084DBT-V140 is designed to operate exclusively with the bq29312 AFE. It relies on the bq29312 for cell voltage monitoring (via VIN), power delivery (eliminating need for external LDO), protection signaling (EVENT, SAFE), and cell balancing control. The BQ2084DBT-V140 lacks internal high-voltage analog front-end circuitry and cannot directly monitor individual cell voltages or drive protection FETs. Its pinout, register map, and functional behavior assume tight co-design with the bq29312-making standalone use unsupported.
What type of LED display does the BQ2084DBT-V140 support?
The BQ2084DBT-V140 supports 3-, 4-, or 5-segment LED displays via its integrated LED1–LED5 drivers, each capable of sourcing 10 mA. Segments illuminate in fixed increments-20%, 25%, or 33%-to indicate remaining capacity from full to empty without host processor involvement. Display configuration (segment count, increment step, and brightness) is programmable via data flash registers. This reduces firmware overhead and enables simple, reliable visual battery status feedback in space-constrained portable devices.
BQ2084DBT-V140 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
BQ2084DBT-V140 FAQ
1.How can I place an order for BQ2084DBT-V140 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2084DBT-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 BQ2084DBT-V140 reliable?
The price and inventory of BQ2084DBT-V140 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2084DBT-V140 is usually 5 days.
3.What payment methods are accepted for BQ2084DBT-V140?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2084DBT-V140 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2084DBT-V140?
BQ2084DBT-V140 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2084DBT-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 BQ2084DBT-V140?
For technical support, including BQ2084DBT-V140 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2084DBT-V140 requirements.
6.How does Aetrix verify that BQ2084DBT-V140 is sourced from the original manufacturer or authorized distributors?
All BQ2084DBT-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 BQ2084DBT-V140 meets industry standards.
7.What is the process for return or replacement of BQ2084DBT-V140?
All BQ2084DBT-V140 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2084DBT-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 BQ2084DBT-V140 part is unused and in its original packaging.
Return procedure for BQ2084DBT-V140:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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