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Texas Instruments BQ2084DBT-V133
- Part No.:
- BQ2084DBT-V133
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2084DBT-V133.pdf
- Description:
- IC GAS GAUGE FOR BQ29312 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,765
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Product details
Overview
BQ2084DBT-V133 from Texas Instruments is a Smart Battery Specification (SBS) v1.1-compliant gas gauge IC for Li-ion and Li-polymer battery packs, featuring a 16-bit delta-sigma ADC for voltage/temperature measurement, a self-calibrating 16-bit integrating converter for coulomb counting (0.65-nVh resolution, <1-µV offset), integrated 1-kB flash memory, and SMBus 2-wire interface - deployed in notebook PCs and portable medical instrumentation to deliver accurate remaining capacity estimation.
For engineers reviewing the BQ2084DBT-V133 datasheet, BQ2084DBT-V133 pinout, BQ2084DBT-V133 application, or BQ2084DBT-V133 equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed SBS v1.1 compliance, and two rigorously cross-checked alternative gas gauges with documented functional differences.
Technical Context
The BQ2084DBT-V133 implements a dual-ADC architecture: one 16-bit delta-sigma converter measures pack/cell voltage and temperature via the bq29312 AFE, while a second 16-bit integrating converter monitors charge/discharge current across SR1–SR2 with continuous sampling and auto-offset calibration (<1 µV). It operates with either an internal 32.768-kHz oscillator (using 100-kΩ ROSC resistor) or external crystal, and embeds a low-power RISC CPU managing SBS v1.1 command execution, LED display control, and register backup via RBI input.
It requires co-location with the TI bq29312 analog front-end for cell balancing, overvoltage/undervoltage protection, and FET drive - the BQ2084DBT-V133 communicates with bq29312 via dedicated SCLK/SDATA lines and controls safety outputs (SAFE, PFIN) and system presence detection (PRES, PU). Its 38-pin TSSOP package integrates all signal conditioning, flash-based cell modeling, and SMBus slave functionality without external EEPROM or crystal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 3.6 V - powers analog (VDDA) and digital (VDDD) domains separately; supports operation across full industrial range (–20°C to 85°C). |
| Coulomb Counting Resolution | Better than 0.65 nVh - enables sub-mAh accuracy in capacity tracking over multi-hour discharge cycles without periodic recalibration. |
| Current Measurement Offset Error | <1 µV (typical) - achieved via auto-calibration connecting SR1/SR2 during 20-s SMBus idle; eliminates sense-resistor drift impact on long-term fuel gauge accuracy. |
| SMBus Interface Speed | 10 kHz to 100 kHz - compatible with standard SMBus 2.0 slaves; supports robust communication even under noisy battery-pack EMI conditions. |
| Internal Flash Memory | 1 kB data flash - stores programmable cell-modeling parameters (nominal capacity, self-discharge rate, temperature compensation coefficients) and retains learned FullChargeCapacity() across power cycles. |
| Operating Temperature Range | –20°C to 85°C - validated for use in portable computing and medical devices where ambient thermal profiles exceed consumer-grade limits. |
| Package | 38-pin TSSOP (DBT) - surface-mount footprint optimized for compact battery pack PCBs; includes dedicated analog/digital ground pins (VSSA/VSSD) for noise isolation. |
Pinout & Package
38-pin Thin Shrink Small Outline Package (TSSOP-DBT), lead pitch 0.5 mm, body width 4.4 mm - designed for automated assembly in battery management modules with strict height constraints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Single-cell voltage input | Receives scaled cell voltage from bq29312 CELL pin; enables individual cell monitoring and EDV threshold detection per cell. |
| SR1 / SR2 | Current sense differential inputs | Accepts ±0.25 V differential signal across external sense resistor (5–30 mΩ); feeds integrating ADC for coulomb counting. |
| TS | Thermistor input | Supports NTC thermistors (e.g., Semitec 103AT) or internal temperature sensor; used for self-discharge compensation and EDV adjustment. |
| SMBC / SMBD | SMBus clock/data | Open-drain bidirectional I/O; interfaces directly with host system controller using SBS v1.1 protocol for RemainingCapacity(), Voltage(), Temperature(). |
| LED1–LED5 | LED segment drivers | Drive 3–5 external LEDs for visual state-of-charge indication (20%/25%/33% increments); eliminate need for external LED drivers. |
| RBI | Register backup input | Accepts capacitor or small battery to retain flash and RAM contents during main supply brownout; ensures data integrity during pack insertion/removal. |
| PRES | System presence detection | Active-low input signals battery pack insertion into host; triggers normal operation mode and enables discharge FET within 250 ms. |
| SAFE | Safety output | Active-low signal for secondary protection (e.g., fuse blow); asserts when critical fault (OV/UV/OC) detected by bq29312 and reported to BQ2084DBT-V133. |
Key Features
| Feature | Design Value |
|---|---|
| SBS v1.1 Compliance | Fully implements Smart Battery Data (SBData) commands including RemainingCapacity(), AtRate(), TimeToEmpty(), and PackStatus() - enables plug-and-play integration with Windows/Linux SBS-aware OS power managers. |
| Integrated Flash-Based Cell Modeling | 1-kB flash stores 12+ programmable parameters (e.g., rate compensation, temperature coefficients, EDV factors) - allows fine-tuned fuel gauge accuracy across diverse Li-ion chemistries and usage profiles without hardware changes. |
| Self-Calibrating Coulomb Counter | Auto-offset calibration reduces integrating ADC error to <1 µV; eliminates manual calibration steps and maintains accuracy over 10+ years of field operation. |
| Dual ADC Architecture | Separate 16-bit delta-sigma (voltage/temp) and integrating (current) converters - prevents cross-talk between high-precision voltage monitoring and high-dynamic-range current integration. |
| LED Display Integration | Five dedicated LED drivers support 3-/4-/5-segment displays with configurable thresholds - replaces discrete LED driver ICs and reduces BOM count in cost-sensitive portable designs. |
Applications
| Notebook PC Battery Management | Portable Medical Instrumentation |
|---|---|
Use Scenario: Integrated smart battery pack for ultrabooks with runtime prediction, thermal-aware charging, and Windows ACPI battery reporting. IC Role / Device Role / Timing Role: Primary SBS v1.1 gas gauge IC; performs real-time coulomb counting, voltage/temperature acquisition, and SMBus data publishing every 1 s. Use Value: Delivers <1% capacity prediction error over full discharge cycle, enabling precise low-battery warnings and adaptive power throttling without host-side firmware intervention. |
Use Scenario: Rechargeable battery module in handheld ultrasound or patient monitor requiring FDA-grade reliability and traceable capacity history. IC Role / Device Role / Timing Role: Fuel gauge core in certified medical battery pack; manages data flash logging, EDV-based safety cutoffs, and RBI-backed register retention during power loss. Use Value: Maintains calibrated capacity data across 10-year product lifecycle via non-volatile flash and register backup - satisfies IEC 62304 software safety requirements for Class C devices. |
| Industrial Portable Test Equipment | High-Accuracy Field Data Loggers |
Use Scenario: Battery-powered oscilloscope or multimeter operating in variable-temperature environments with extended field deployment. IC Role / Device Role / Timing Role: Gas gauge subsystem co-located with bq29312 AFE; executes temperature-compensated self-discharge modeling and mid-range voltage calibration (VOC25/VOC50/VOC75). Use Value: Achieves stable remaining capacity estimation across –20°C to 60°C ambient range - eliminates false "low battery" alerts during cold-start field measurements. |
Use Scenario: Remote environmental sensor node powered by Li-ion with multi-year deployment and infrequent maintenance access. IC Role / Device Role / Timing Role: Long-life fuel gauge managing ultra-low-power sleep mode (8 µA), flash-based learning cycles, and SMBus wake-on-event communication. Use Value: Reduces average system current to <15 µA in storage mode while preserving learned FCC and self-discharge history - extends shelf life beyond 5 years without capacity drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ20Z75-V163 | Supports SBS v1.1 + v2.0; adds SHA-1 authentication, enhanced security registers, and higher-resolution 18-bit current ADC (0.25 nVh). | Required for systems needing cryptographic battery authentication (e.g., enterprise laptops, military comms gear). | Select BQ20Z75-V163 only if SBS v2.0 compliance or secure boot verification is mandatory; not drop-in due to different flash layout and register map. |
| BQ27426 | Standalone gauge (no AFE co-dependency); uses internal sense FET; lower pin count (12-pin DSBGA); no LED drivers or RBI input. | Targeted at space-constrained single-cell packs without external protection ICs or visual indicators. | Choose BQ27426 for simplified, low-cost single-cell designs; BQ2084DBT-V133 remains optimal for multi-cell packs requiring bq29312 integration and LED feedback. |
Compared with BQ20Z75-V163, the BQ2084DBT-V133 offers proven SBS v1.1 interoperability and integrated LED drivers but lacks cryptographic features; versus BQ27426, it provides superior multi-cell support and system-level safety signaling via SAFE/PFIN, at the cost of higher pin count and AFE dependency.
Availability
BQ2084DBT-V133 is available at Aetrix Electronics and suitable for notebook PC battery packs, portable medical instrumentation, and industrial test equipment requiring stable component supply, long-term lifecycle support, and validated SBS v1.1 compliance.
Supply support for BQ2084DBT-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 BQ2084DBT-V133 belongs to TI's Smart Battery Gauge family, engineered specifically for high-accuracy Li-ion/Li-polymer fuel gauging in multi-cell smart battery systems requiring SBS v1.1 compliance and seamless AFE co-operation.
FAQ
What is the primary function of the BQ2084DBT-V133 in a smart battery system?
The BQ2084DBT-V133 serves as the core SBS v1.1-compliant gas gauge IC, performing real-time coulomb counting, voltage/temperature measurement, and SMBus data reporting to host systems. It works exclusively with the bq29312 AFE to manage cell balancing, protection, and FET control - the BQ2084DBT-V133 itself does not provide protection functions but orchestrates them via the AFE interface.
Does the BQ2084DBT-V133 require an external crystal oscillator?
No - the BQ2084DBT-V133 supports both internal and external timing sources. With a 100-kΩ resistor on ROSC (pin 33), it uses its internal 32.768-kHz oscillator; with a 12-pF crystal on XCK1/XCK2 (pins 34/33), it switches to crystal mode. Both configurations are fully supported, and the device auto-detects at power-up - the BQ2084DBT-V133 does not require external crystal unless higher frequency stability is needed.
How does the BQ2084DBT-V133 achieve high-accuracy fuel gauging over time?
The BQ2084DBT-V133 achieves long-term accuracy through three mechanisms: (1) auto-offset calibration of the integrating ADC (<1 µV error), (2) flash-stored cell-modeling parameters that compensate for temperature, rate, and aging effects, and (3) qualified discharge learning that updates FullChargeCapacity() based on actual field-use discharge profiles. These features ensure BQ2084DBT-V133 maintains <1% capacity error across hundreds of cycles without manual recalibration.
Can the BQ2084DBT-V133 operate without the bq29312 AFE?
No - the BQ2084DBT-V133 is architecturally dependent on the bq29312 AFE for critical functions: cell voltage measurement (via VIN), protection logic (OV/UV/OC), FET drive, and cell balancing. The BQ2084DBT-V133 lacks internal ADC channels for direct cell voltage sensing and has no FET gate drivers. Its pinout, register map, and firmware assume co-location with bq29312 - standalone operation is not supported.
What is the role of the RBI pin on the BQ2084DBT-V133?
The RBI (Register Backup Input) pin on the BQ2084DBT-V133 provides a backup power path to retain volatile RAM and flash configuration data during main supply interruption. When VDD drops below the power-on reset threshold (~2.3 V), the BQ2084DBT-V133 switches to RBI-supplied power (minimum 1.3 V) to preserve learned FullChargeCapacity(), remaining capacity, and safety flags - ensuring BQ2084DBT-V133 resumes operation with consistent state after pack reinsertion or brownout recovery.
BQ2084DBT-V133 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-V133 FAQ
1.How can I place an order for BQ2084DBT-V133 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2084DBT-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 BQ2084DBT-V133 reliable?
The price and inventory of BQ2084DBT-V133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2084DBT-V133 is usually 5 days.
3.What payment methods are accepted for BQ2084DBT-V133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2084DBT-V133 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2084DBT-V133?
BQ2084DBT-V133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2084DBT-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 BQ2084DBT-V133?
For technical support, including BQ2084DBT-V133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2084DBT-V133 requirements.
6.How does Aetrix verify that BQ2084DBT-V133 is sourced from the original manufacturer or authorized distributors?
All BQ2084DBT-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 BQ2084DBT-V133 meets industry standards.
7.What is the process for return or replacement of BQ2084DBT-V133?
All BQ2084DBT-V133 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2084DBT-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 BQ2084DBT-V133 part is unused and in its original packaging.
Return procedure for BQ2084DBT-V133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ2084DBT-V133 Tags
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Texas Instruments
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