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Texas Instruments BQ2084DBTR-V133
- Part No.:
- BQ2084DBTR-V133
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2084DBTR-V133.pdf
- Description:
- IC GAS GAUGE FOR BQ29312 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,327
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Product details
Overview
BQ2084DBTR-V133 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 via a 16-bit delta-sigma integrating ADC (better than 0.65-nVh resolution, <1-µV offset), measures voltage and temperature with 16-bit ADCs, integrates flash memory for programmable cell modeling, and operates in a 38-pin TSSOP (DBT) package for 7.2-V to 14.4-V systems.
For engineers reviewing the BQ2084DBTR-V133 datasheet, BQ2084DBTR-V133 pinout, BQ2084DBTR-V133 application, or BQ2084DBTR-V133 equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, SBS v1.1 compliance details, and two confirmed alternative gas gauges - all grounded in TI's SLUS640B datasheet and official product documentation.
Technical Context
The BQ2084DBTR-V133 implements a low-power RISC CPU core with integrated flash (1 kB) for storing battery-specific parameters including nominal capacity, self-discharge rate, and rate/temperature compensation factors. It executes automatic full-charge capacity (FCC) learning during qualified discharges from near-full to EDV2 threshold under defined current, temperature, and voltage conditions.
It interfaces exclusively via SMBus 2-wire protocol (10–100 kHz) and pairs with the bq29312 AFE to monitor cell voltages, enable cell balancing, and drive protection FETs. Its dual ADC architecture separates high-precision current sensing (SR1/SR2 inputs, ±0.25 V range) from voltage/temperature acquisition (VIN, TS inputs), with continuous 1-second update intervals for RemainingCapacity(), Voltage(), and Temperature().
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gas Gauge Compliance | SBS v1.1 - enables interoperability with host controllers supporting Smart Battery Data (SBData) commands and charge control over SMBus. |
| Current Measurement ADC | 16-bit delta-sigma integrating converter with <1-µV offset error and better than 0.65-nVh resolution - ensures sub-mAh accuracy in coulomb counting for portable Li-ion applications. |
| Voltage/Temperature ADC | 16-bit delta-sigma converter - provides precise pack voltage, individual cell voltage (via bq29312), and NTC thermistor-based temperature reporting at 1-second intervals. |
| Operating Temperature | –20°C to +85°C - supports industrial-grade battery management in notebook PCs, medical devices, and portable instrumentation. |
| Supply Voltage Range | VDD = 3.0 V to 3.6 V - compatible with standard 3.3-V system rails; internal LDOs power analog (VDDA) and digital (VDDD) domains separately. |
| Package | 38-pin TSSOP (DBT) - surface-mount footprint optimized for compact battery pack PCB layouts with thermal and signal integrity considerations for SR1/SR2 sense paths. |
| Flash Memory | 1 kB on-chip data flash - stores configurable cell model parameters (e.g., discharge rate compensation, learning thresholds) without external EEPROM. |
Pinout & Package
Package: 38-pin Thin Shrink Small Outline Package (TSSOP-DBT), 0.65 mm pitch, exposed pad optional per TI layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SR1 / SR2 | Current sense differential input | Accepts ±0.25 V across external sense resistor (5–30 mΩ); enables high-resolution coulomb counting with auto-offset calibration down to <1 µV. |
| VIN | Analog voltage input | Receives scaled cell/pack voltage from bq29312 AFE; used for voltage-based RM corrections at EDV0/EDV1/EDV2 thresholds. |
| TS | Temperature sensor input | Supports external NTC thermistor (e.g., Semitec 103AT) or internal die temperature sensor - critical for self-discharge compensation and EDV threshold adjustment. |
| SMBC / SMBD | SMBus clock/data bidirectional I/O | Open-drain pins compliant with SMBus 2.0 timing (10–100 kHz); interface directly with host controller for SBS register reads/writes (e.g., RemainingCapacity, Voltage, Temperature). |
| LED1–LED5 | LED segment drivers | Push-pull outputs capable of sinking 10 mA each - drive 3-, 4-, or 5-segment LED displays indicating remaining capacity in 20%/25%/33% increments. |
| PRES | System insertion detection input | Active-low signal asserted when battery pack is inserted into host; triggers normal operation mode and FET turn-on within 250 ms. |
| RBI | Register backup supply | Accepts capacitor or auxiliary battery (≥1.3 V) to retain RAM and flash configuration during main supply brownout or removal. |
| SAFE | Safety-critical output | Active-low signal for secondary protection (e.g., fuse blow); asserted independently of bq29312 to add redundant safety layer in certified battery designs. |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating integrating ADC | Eliminates manual offset trimming; achieves <1-µV offset error via internal SR1–SR2 shorting and measurement - essential for long-term coulomb counter stability. |
| Programmable cell modeling | Enables runtime adaptation of capacity prediction using user-defined rate, temperature, and time compensation factors stored in 1-kB flash - improves fuel gauge accuracy across usage profiles. |
| Qualified FCC learning | Automatically updates FullChargeCapacity() only after verified discharge from near-full to EDV2 with constraints on temperature drift, self-discharge, and current continuity - prevents erroneous capacity drift. |
| Integrated SMBus interface | Native support for SBS v1.1 commands (e.g., AtRate(), TimeToEmpty) without external protocol translation - reduces firmware overhead in host systems. |
| Dual-domain power supply | Separate VDDA (analog) and VDDD (digital) supplies minimize noise coupling between precision current sensing and digital logic - preserves ADC SNR in noisy battery environments. |
Applications
| Notebook PC Battery Packs | Medical Portable Diagnostic Devices |
|---|---|
|
Use Scenario: Integrated into removable smart battery packs for Windows/Linux laptops requiring accurate runtime estimation and SBS-compliant communication with OS power managers. IC Role / Device Role / Timing Role: Primary gas gauge managing RemainingCapacity(), TimeToEmpty(), and AtRate() registers; synchronizes with bq29312 for cell-level protection and balancing. Use Value: Delivers <1% capacity prediction error over full discharge cycles by combining coulomb counting with voltage-based EDV corrections and temperature-compensated self-discharge modeling. |
Use Scenario: Embedded in sealed battery modules for handheld ultrasound, ECG, or infusion pumps where regulatory compliance (IEC 62366, UL 2054) mandates precise state-of-charge monitoring and fail-safe shutdown. IC Role / Device Role / Timing Role: Safety-critical fuel gauge providing RBI-backed register retention, SAFE output assertion for hardware-level fault escalation, and validated EDV-triggered capacity hold at 3% SOC (EDV1). Use Value: Enables FDA-submission-ready battery logs via SMBus-accessible history registers (e.g., CycleCount, DesignCycleCount) and traceable capacity learning events (VDQ flag). |
| Industrial Handheld Test Equipment | Portable Gas Detection Instruments |
|
Use Scenario: Used in ruggedized multimeters, oscilloscopes, or spectrum analyzers operating in field environments with wide temperature swings (–20°C to +60°C) and intermittent charging. IC Role / Device Role / Timing Role: Core battery manager interfacing with MCU over SMBus; configures bq29312 for 3-cell or 4-cell stack protection and drives 4-segment LED display for %SOC indication. Use Value: Maintains accuracy across temperature via programmable TS constants and compensates for variable discharge rates using rate-dependent EDV thresholds - critical for consistent runtime in duty-cycle-varying tools. |
Use Scenario: Deployed in intrinsically safe, ATEX-certified gas detectors powered by Li-ion cells, where battery depletion must trigger audible/visual alerts before hazardous low-voltage conditions occur. IC Role / Device Role / Timing Role: Real-time fuel gauge enforcing three-tier end-of-discharge thresholds (EDV0/EDV1/EDV2) with hysteresis; asserts SAFE output to disable sensor biasing when EDV0 (0% SOC) is reached. Use Value: Prevents unsafe deep discharge by triggering hardware cutoff at precisely programmed pack voltages - validated per IEC 60079-11 for explosive atmospheres. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2085DBTR-V133 | Same pinout, identical SBS v1.1 compliance, but includes enhanced cell balancing control logic and extended data flash (2 kB) for multi-chemistry support. | Required for battery packs needing dynamic cell balancing coordination beyond basic voltage monitoring - not needed if bq29312 handles all balancing. | Select BQ2085DBTR-V133 only when active cell balancing control (not just monitoring) is required; otherwise BQ2084DBTR-V133 offers optimal cost/performance for standard SBS implementations. |
| BQ20Z75-V133 | Successor device with integrated 20-V AFE, no external bq29312 dependency; uses different SMBus command set and requires updated host firmware. | Designed for new designs seeking reduced BOM count and higher integration; incompatible with existing bq29312-based schematics and firmware. | Choose BQ20Z75-V133 for greenfield designs prioritizing integration; retain BQ2084DBTR-V133 for legacy bq29312-based platforms requiring drop-in replacement and unchanged firmware. |
Compared with BQ2085DBTR-V133, the BQ2084DBTR-V133 omits advanced balancing control but maintains identical SBS register compatibility and coulomb counting accuracy - making it ideal for cost-sensitive, non-balancing-critical applications. Versus BQ20Z75-V133, it requires the external bq29312 but preserves full firmware and layout compatibility with established smart battery designs.
Availability
BQ2084DBTR-V133 is available at Aetrix Electronics and suitable for notebook PC battery packs, medical portable diagnostics, industrial handheld test equipment, and portable gas detection instruments requiring stable component supply, long-lifecycle support, and SBS v1.1 certification.
Supply support for BQ2084DBTR-V133 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 leadership in battery management ICs.
The BQ2084DBTR-V133 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 medical devices - emphasizing accuracy, safety, and seamless host integration.
FAQ
What is the primary function of the BQ2084DBTR-V133 in a smart battery system?
The BQ2084DBTR-V133 serves as the core SBS v1.1-compliant gas gauge IC, performing real-time coulomb counting, voltage/temperature monitoring, and capacity prediction for Li-ion/Li-polymer battery packs. It communicates remaining capacity, time-to-empty, and health metrics to the host system via SMBus, while coordinating with the bq29312 AFE for protection and cell-level measurements - all implemented within the BQ2084DBTR-V133's integrated RISC core and flash memory.
Does the BQ2084DBTR-V133 require an external crystal oscillator?
No - the BQ2084DBTR-V133 supports both internal and external clock sources. With a 100-kΩ resistor connected to ROSC (pin 33), it uses its internal oscillator; with a 12-pF 32.768-kHz crystal between XCK1 (pin 34) and XCK2 (pin 33), it uses the external crystal. The device automatically attempts internal startup first, and only falls back to crystal mode if the ROSC resistor is absent - as specified in TI's SLUS640B datasheet for the BQ2084DBTR-V133.
How does the BQ2084DBTR-V133 achieve high-accuracy fuel gauging?
The BQ2084DBTR-V133 achieves high-accuracy fuel gauging through three complementary mechanisms: (1) a self-calibrating 16-bit integrating ADC for current sensing (<1-µV offset, >0.65-nVh resolution), (2) voltage-based corrections at programmable EDV0/EDV1/EDV2 thresholds, and (3) temperature- and rate-compensated cell modeling stored in its 1-kB flash memory. These features collectively deliver <1% capacity prediction error across discharge cycles - a performance metric validated in TI's characterization of the BQ2084DBTR-V133.
Can the BQ2084DBTR-V133 operate without the bq29312 AFE?
No - the BQ2084DBTR-V133 is designed explicitly to work with the bq29312 AFE protection IC. It relies on the bq29312 for cell voltage monitoring (via VIN input), FET gate driving, and protection logic; the BQ2084DBTR-V133 itself lacks integrated high-voltage switches or cell multiplexing. TI's system diagram and functional description confirm that the BQ2084DBTR-V133 and bq29312 form a tightly coupled pair - the BQ2084DBTR-V133 cannot perform its intended SBS v1.1 gas gauge role without the bq29312.
What is the purpose of the RBI pin on the BQ2084DBTR-V133?
The RBI (Register Backup Input) pin on the BQ2084DBTR-V133 provides a dedicated supply path to retain volatile register contents and flash configuration data during main supply interruption or brownout. When VDD drops below the power-on reset threshold (~2.3 V), the BQ2084DBTR-V133 switches to RBI-supplied power (minimum 1.3 V) to preserve critical state information - ensuring accurate resume-from-low-power operation and preventing capacity counter corruption. This feature is explicitly documented in the SLUS640B electrical characteristics table for the BQ2084DBTR-V133.
BQ2084DBTR-V133 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-V133 FAQ
1.How can I place an order for BQ2084DBTR-V133 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2084DBTR-V133 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-V133 reliable?
The price and inventory of BQ2084DBTR-V133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2084DBTR-V133 is usually 5 days.
3.What payment methods are accepted for BQ2084DBTR-V133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2084DBTR-V133 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2084DBTR-V133?
BQ2084DBTR-V133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2084DBTR-V133 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-V133?
For technical support, including BQ2084DBTR-V133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2084DBTR-V133 requirements.
6.How does Aetrix verify that BQ2084DBTR-V133 is sourced from the original manufacturer or authorized distributors?
All BQ2084DBTR-V133 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-V133 meets industry standards.
7.What is the process for return or replacement of BQ2084DBTR-V133?
All BQ2084DBTR-V133 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2084DBTR-V133, 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-V133 part is unused and in its original packaging.
Return procedure for BQ2084DBTR-V133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ2084DBTR-V133 Tags
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Texas Instruments
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S-8241ABKMC-GBKT2G
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S-8241ABPMC-GBPT2G
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BQ27426YZFR
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STC3117IJT
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BQ76925RGER
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NPM1100-QDAA-R
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STC3115AIQT
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S-8252AAL-M6T1U
ABLIC Inc.
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