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Texas Instruments BQ2084DBT-V141
- Part No.:
- BQ2084DBT-V141
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- -
- Datasheet:
-
BQ2084DBT-V141.pdf
- Description:
- IC SUPERVISOR PWR SUP SUPPORT
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Product details
Overview
BQ2084DBT-V141 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 delivers accurate remaining capacity measurement via 16-bit delta-sigma integrating ADC (0.65-nVh resolution, <1-µV offset), supports SMBus 2-wire interface, integrates 1-kB flash memory for programmable cell modeling, and operates in a 38-pin TSSOP (DBT) package across –20°C to 85°C for notebook PC battery management.
For engineers reviewing the BQ2084DBT-V141 datasheet, BQ2084DBT-V141 pinout, BQ2084DBT-V141 application, or BQ2084DBT-V141 equivalent, key selection considerations include its SBS v1.1 compliance, coulomb-counting accuracy with self-calibrating current sensing, integrated LED drivers for 3–5-segment fuel gauge display, compatibility with bq29312 AFE, and operating supply range of 3 V to 3.6 V.
Technical Context
The BQ2084DBT-V141 implements a low-power RISC CPU core with dedicated peripherals for real-time battery monitoring. It performs continuous coulomb counting using a bipolar integrating ADC on SR1/SR2 (±0.25 V input range), measures pack/cell voltage and temperature via a second 16-bit sigma-delta ADC, and executes voltage-based RM corrections at EDV0/EDV1/EDV2 thresholds with programmable compensation.
It relies on external bq29312 analog front-end for cell balancing, overvoltage/overcurrent protection, and level translation, while managing communication via SMBus slave mode (10–100 kHz), supporting SBS data commands, and maintaining register backup via RBI pin with capacitor or battery hold-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gas Gauge Standard | SBS v1.1 compliant - enables interoperability with host controllers supporting Smart Battery Data (SBData) commands and charge-control functions. |
| Current Measurement | 16-bit integrating delta-sigma ADC - provides better than 0.65-nVh resolution and <1-µV offset error for high-accuracy coulomb counting in portable Li-ion applications. |
| Voltage/Temperature Sensing | 16-bit delta-sigma ADC - measures pack voltage, individual cell voltages (via bq29312), and thermistor-based temperature with <1% error. |
| Operating Supply | 3 V to 3.6 V - powers dual-domain circuitry (VDDA/VDDD) and supports stable operation across industrial temperature range (–20°C to 85°C). |
| Interface Protocol | SMBus 2-wire (SMBC/SMBD) - operates as slave at 10–100 kHz; supports system-level battery status reporting including RemainingCapacity(), Voltage(), Temperature(), and AtRate(). |
| On-chip Memory | 1-kB flash memory - stores nominal capacity, self-discharge rate, rate/temperature compensation factors, and programmable cell-modeling parameters for adaptive fuel gauging. |
| LED Drive Capability | 5-channel open-drain LED drivers (LED1–LED5) - supports 3-, 4-, or 5-segment visual fuel gauge indication with configurable 20%/25%/33% capacity increments. |
Pinout & Package
Package: 38-pin TSSOP (DBT), RoHS-compliant, surface-mount, 9.7 mm × 4.4 mm footprint with exposed thermal pad (not electrically connected). Pin pitch: 0.5 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SR1 / SR2 | Current sense differential input | Connects to series sense resistor (5–30 mΩ); enables bidirectional coulomb counting with ±0.25 V input range and auto-offset calibration. |
| VIN | Analog voltage input | Receives scaled cell/pack voltage from bq29312 AFE; used for Voltage() and VCELLx() measurements. |
| TS | Temperature sensor input | Accepts NTC thermistor (e.g., Semitec 103AT) or internal sensor; enables temperature-compensated self-discharge and capacity estimation. |
| SMBD / SMBC | SMBus bidirectional data/clock | Open-drain pins for SBS-compliant communication with host controller; support 10–100 kHz clock frequency and standard SMBus timing. |
| LED1–LED5 | LED segment drivers | Open-drain outputs driving external LEDs; configured for 3–5-segment fuel gauge display with programmable increment granularity. |
| RBI | Register backup input | Accepts capacitor or small battery to maintain data flash and RAM contents during brown-out or pack removal events. |
| PRES | System insertion detection | Active-low input indicating battery pack presence; triggers normal operation and FET enable within 250 ms of detection. |
| SAFE | Safety fault output | Active-low signal for secondary protection (e.g., fuse blow); asserts on critical faults detected by bq29312 or BQ2084DBT-V141 logic. |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating integrating ADC | Automatically cancels SR1/SR2 offset down to <1 µV without external calibration hardware, ensuring long-term coulomb-counting stability. |
| Programmable cell modeling | Enables dynamic adjustment of remaining capacity based on real-time temperature, discharge rate, and aging - improving fuel gauge accuracy beyond fixed-table methods. |
| Integrated LED drivers | Eliminates need for external LED driver ICs; supports direct connection to 3–5 discrete LEDs with current-limiting resistors for compact battery-pack UI. |
| Flash-based configuration storage | Retains user-defined battery parameters (nominal capacity, EDV thresholds, compensation factors) across power cycles and enables field updates without EEPROM. |
| SBS v1.1 command set support | Provides standardized access to RemainingCapacity(), FullChargeCapacity(), Temperature(), Voltage(), and cycle count - simplifying host firmware integration. |
Applications
| Notebook PC Battery Management | Medical Portable Device Power Monitoring |
|---|---|
Use Scenario: Integrated into removable smart battery packs for ultrabooks and business laptops requiring precise runtime prediction and SBS-compliant host communication. IC Role / Device Role / Timing Role: Primary gas gauge IC performing real-time coulomb counting, voltage/temperature compensation, and SMBus reporting to OS-level power manager. Use Value: Enables accurate "minutes remaining" estimates and graceful OS shutdown before deep discharge, leveraging 0.65-nVh current resolution and EDV-based RM correction. |
Use Scenario: Embedded in sealed battery modules for handheld diagnostic tools and portable infusion pumps where regulatory compliance and runtime reliability are critical. IC Role / Device Role / Timing Role: Standalone fuel gauge with fail-safe SAFE output and RBI-backed register retention, interfacing with microcontroller over SMBus. Use Value: Maintains valid state-of-charge during brief power interruptions (e.g., hot-swap events) and ensures consistent capacity reporting across clinical usage cycles. |
| Industrial Handheld Instrumentation | Test & Measurement Equipment Batteries |
Use Scenario: Used in ruggedized multimeters and spectrum analyzers with hot-swappable Li-ion packs needing robust temperature-compensated gauging under variable load profiles. IC Role / Device Role / Timing Role: Core battery monitor executing programmable cell modeling and learning full-charge capacity (FCC) during field calibration cycles. Use Value: Achieves <1% capacity prediction error across –20°C to 85°C by combining integrating ADC accuracy with adaptive self-discharge modeling. |
Use Scenario: Deployed in benchtop oscilloscopes and logic analyzers with internal rechargeable battery backups requiring precise low-power state tracking. IC Role / Device Role / Timing Role: Gas gauge with low-power storage mode (8 µA) and SMBus wake-on-event capability for periodic health checks during standby. Use Value: Extends backup runtime by minimizing quiescent current while retaining full configuration and learned FCC in flash memory for instant resume. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2084RTT-V143 | Same die, 36-pin QFN (RTT) package - smaller footprint (6 mm × 6 mm), no exposed pad; identical electrical specs and firmware. | Preferred for space-constrained battery packs where TSSOP height or thermal pad handling is impractical. | Select BQ2084RTT-V143 when PCB area is limited and reflow profile supports QFN; verify thermal performance without exposed pad. |
| BQ20Z75-V150 | Successor device with enhanced SBS v1.1+ features: higher-resolution ADC (17-bit), extended temperature range (–40°C to 85°C), and improved EDV compensation algorithms. | Targets next-gen designs requiring longer lifecycle support, wider environmental tolerance, and tighter accuracy over aging. | Choose BQ20Z75-V150 for new designs needing extended qualification; BQ2084DBT-V141 remains suitable for cost-sensitive, legacy-compatible implementations. |
Compared with BQ2084RTT-V143, the BQ2084DBT-V141 offers easier manual assembly and thermal relief via TSSOP leads, while BQ20Z75-V150 adds measurable accuracy and temperature resilience - making BQ2084DBT-V141 optimal for established notebook and medical battery platforms where footprint and supply chain continuity are prioritized.
Availability
BQ2084DBT-V141 is available at Aetrix Electronics and suitable for notebook PCs, portable medical devices, industrial handheld instruments, and test equipment requiring stable component supply, long-lifecycle availability, and SBS v1.1 interoperability.
Supply support for BQ2084DBT-V141 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 systems.
The BQ2084DBT-V141 belongs to TI's Smart Battery Fuel Gauge product line, engineered specifically for high-accuracy Li-ion/Li-polymer capacity tracking in portable computing and mission-critical portable electronics.
FAQ
What is the primary function of the BQ2084DBT-V141 in a battery pack?
The BQ2084DBT-V141 serves as an SBS v1.1-compliant gas gauge IC that accurately tracks remaining capacity in Li-ion and Li-polymer battery packs using coulomb counting, voltage/temperature compensation, and programmable cell modeling. It reports real-time data-including RemainingCapacity(), Voltage(), and Temperature()-to the host system via SMBus, enabling precise runtime estimation and intelligent power management in devices like notebooks and medical instruments. The BQ2084DBT-V141 integrates all essential functions except protection, which is handled by the companion bq29312 AFE.
Does the BQ2084DBT-V141 require an external crystal oscillator?
No-the BQ2084DBT-V141 supports both internal and external oscillator configurations. It defaults to internal operation using a 100-kΩ resistor on ROSC (pin 33), but automatically switches to external 32.768-kHz crystal mode if the resistor is absent. The datasheet specifies that only one option-either the ROSC resistor or the crystal-should be populated, not both. The internal oscillator achieves ±2% frequency error (typical), while the crystal option improves timing accuracy for applications demanding tighter synchronization.
How does the BQ2084DBT-V141 handle battery capacity learning and FullChargeCapacity (FCC) updates?
The BQ2084DBT-V141 performs automatic capacity learning during qualified discharges-from near-full to EDV2 threshold-under defined conditions (e.g., temperature > Learning Low Temp, no overload, ≤256 mAh self-discharge). Upon completion, it updates the FullChargeCapacity() (FCC) register with the measured discharge value and saves it to on-chip flash. FCC becomes the reference for relative state-of-charge calculations and AtRate() predictions. The BQ2084DBT-V141 also supports manual FCC override via SMBus commands for factory calibration or field recalibration.
Can the BQ2084DBT-V141 operate without the bq29312 analog front-end?
No-the BQ2084DBT-V141 is explicitly designed to work in tandem with the bq29312 AFE. It relies on the bq29312 for cell voltage monitoring, overvoltage/overcurrent protection, cell balancing control, and level translation between the high-side cell stack and BQ2084DBT-V141's low-voltage domain. While the BQ2084DBT-V141 handles computation and communication, the bq29312 provides essential analog safety and measurement infrastructure; neither IC is functionally complete without the other in production SBS battery packs.
What is the role of the RBI pin on the BQ2084DBT-V141?
The RBI (Register Backup Input) pin on the BQ2084DBT-V141 provides backup power to retain volatile RAM and flash configuration data during brown-out or pack removal events. When VDD drops below the power-on reset threshold (~2.1–2.5 V), the BQ2084DBT-V141 switches to RBI-supplied power (minimum 1.3 V) to preserve register states and prevent loss of learned capacity or calibration settings. A small capacitor (typically 10–100 µF) or coin-cell battery is connected to RBI to ensure ≥10-year data retention per flash specifications, directly supporting reliable hot-swap functionality in portable systems.
BQ2084DBT-V141 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:
- -
BQ2084DBT-V141 FAQ
1.How can I place an order for BQ2084DBT-V141 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2084DBT-V141 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-V141 reliable?
The price and inventory of BQ2084DBT-V141 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2084DBT-V141 is usually 5 days.
3.What payment methods are accepted for BQ2084DBT-V141?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2084DBT-V141 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2084DBT-V141?
BQ2084DBT-V141 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2084DBT-V141 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-V141?
For technical support, including BQ2084DBT-V141 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2084DBT-V141 requirements.
6.How does Aetrix verify that BQ2084DBT-V141 is sourced from the original manufacturer or authorized distributors?
All BQ2084DBT-V141 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-V141 meets industry standards.
7.What is the process for return or replacement of BQ2084DBT-V141?
All BQ2084DBT-V141 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2084DBT-V141, 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-V141 part is unused and in its original packaging.
Return procedure for BQ2084DBT-V141:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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