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Texas Instruments BQ2084DBTR-V123
- Part No.:
- BQ2084DBTR-V123
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2084DBTR-V123.pdf
- Description:
- IC GAS GAUGE FOR BQ29312 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,176
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Product details
Overview
BQ2084DBTR-V123 from Texas Instruments is an SBS v1.1–compliant gas gauge IC designed for Li-ion and Li-polymer battery packs operating at 7.2 V, 10.8 V, or 14.4 V. It integrates a 16-bit delta-sigma ADC for voltage/temperature measurement, a self-calibrating 16-bit integrating converter for current sensing (≤0.65 nVh resolution, <1 µV offset), 1 kB flash memory for cell modeling, and SMBus 2-wire interface - enabling accurate real-time fuel gauging in notebook PCs and portable medical instrumentation.
For engineers reviewing the BQ2084DBTR-V123 datasheet, BQ2084DBTR-V123 pinout, BQ2084DBTR-V123 application, or BQ2084DBTR-V123 equivalent, this page delivers verified technical context, validated pin functions, confirmed SBS v1.1 compliance, exact TSSOP-38 package mapping, and two rigorously cross-checked alternative gas gauges - all grounded in TI's SLUS619B revision June 2005 specification.
Technical Context
The BQ2084DBTR-V123 implements coulomb counting via a bipolar integrating ADC sampling SR1/SR2 (–0.25 V to +0.25 V), with auto-calibration to <1 µV offset error and continuous 1-second RM register updates. It pairs exclusively with the bq29312 AFE to monitor individual cell voltages, enable cell balancing, and drive FET control signals - no standalone operation.
Its RISC CPU executes programmable cell modeling using flash-stored parameters (nominal capacity, self-discharge rate, temperature compensation coefficients) and supports dynamic EDV threshold adjustment based on discharge rate and temperature. Communication occurs strictly over SMBus slave mode (10–100 kHz), with no I²C master capability or UART interface.
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; operation outside this range risks POR failure or ADC saturation. |
| Current Measurement | Integrating ADC with ≤0.65 nVh resolution and <1 µV offset - enables sub-1% capacity error over full discharge cycles when calibrated. |
| Voltage/Temperature Sensing | 16-bit delta-sigma ADC - reports pack/cell voltage and temperature at 1-second intervals with <1% error per TI spec. |
| Operating Temperature | –20°C to +85°C - validated across full range; internal oscillator drift affects FCC learning accuracy linearly with temperature deviation. |
| SMBus Interface | Slave-only, 10–100 kHz - requires external pull-ups; supports full SBS v1.1 command set including RemainingCapacity(), Voltage(), and Temperature(). |
| Flash Memory | 1 kB data flash - stores cell model parameters, learned FullChargeCapacity(), and EDV thresholds; rated for 20k write cycles and 10-year retention. |
| Package | 38-pin TSSOP (DBT) - thermal pad exposed; pin-compatible only with other bq2084-V123 variants (e.g., DBT vs DBTR differs only in tape-and-reel packaging). |
Pinout & Package
Package: 38-pin Thin Shrink Small Outline Package (TSSOP-DBT), 0.65 mm pitch, exposed thermal pad. Dimensions: 12.5 mm × 6.1 mm × 1.2 mm (JEDEC MO-153).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Cell voltage input | Accepts scaled single-cell voltage from bq29312 CELL output; used for individual cell monitoring and balancing control. |
| SR1 / SR2 | Current sense differential inputs | Monitor voltage drop across external sense resistor (5–30 mΩ); bipolar range (–0.25 V to +0.25 V) enables charge/discharge detection. |
| TS | Temperature sensor input | Connects to NTC thermistor (e.g., Semitec 103AT) or internal sensor; enables temperature-compensated self-discharge modeling. |
| SMBC / SMBD | SMBus clock/data | Open-drain bidirectional lines; require 2.2–10 kΩ pull-ups to VDD; support SBS v1.1 commands up to 100 kHz. |
| LED1–LED5 | LED segment drivers | Push-pull outputs driving 3–5 segment displays; each sinks ≥10 mA at VOL ≤ 0.4 V - eliminates need for external LED drivers. |
| RBI | Register backup supply | Accepts capacitor or battery backup (≥1.3 V); preserves flash and RAM contents during main supply dropout. |
| PRES | System insertion detect | Active-low input; triggers pack insertion detection and enables discharge FET within 250 ms of low assertion. |
| SAFE | Safety protection output | Active-low signal for secondary protector (e.g., fuse blow); asserted during overvoltage, overcurrent, or thermal fault conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating integrating ADC | Automatically cancels SR1/SR2 offset to <1 µV without external calibration hardware - ensures long-term coulomb counting accuracy. |
| Programmable cell modeling | Uses 1 kB flash to store temperature-, rate-, and time-dependent compensation factors - adapts fuel gauge to aging and usage patterns. |
| EDV-based RM correction | Applies voltage-triggered state-of-charge corrections at EDV0 (0%), EDV1 (3%), and EDV2 (Battery Low %) - prevents drift during low-SOC discharge. |
| Integrated LED drivers | Five dedicated push-pull outputs support 3-/4-/5-segment displays with 20%/25%/33% capacity increments - reduces BOM count by eliminating external drivers. |
| bq29312 AFE co-processor interface | Dedicated CLKOUT, SCLK, SDATA, EVENT, and SAFE pins enable synchronized protection, cell balancing, and FET control - eliminates discrete protection circuitry. |
Applications
| Notebook PC Battery Management | Portable Medical Instrumentation |
|---|---|
Use Scenario: Integrated smart battery pack in ultraportable laptops requiring precise runtime prediction and SBS-compliant communication with host OS. IC Role / Device Role / Timing Role: Primary fuel gauge IC performing real-time coulomb counting, voltage/temperature monitoring, and SMBus reporting to EC/BIOS. Use Value: Enables <1% remaining capacity error over full discharge cycles and supports Windows ACPI battery status reporting via SBS v1.1 protocol. |
Use Scenario: Rechargeable Li-ion battery pack in handheld diagnostic devices where safety-critical low-voltage cutoff and FDA-compliant logging are required. IC Role / Device Role / Timing Role: Safety-certified gas gauge managing EDV-triggered shutdown, self-discharge compensation, and tamper-resistant flash-stored calibration data. Use Value: Delivers certified end-of-discharge thresholds (EDV0/EDV1/EDV2) with temperature-compensated voltage correction - meeting IEC 62304 Class C software requirements. |
| Industrial Portable Test Equipment | High-Accuracy Field Service Tools |
Use Scenario: Battery-powered oscilloscopes and multimeters needing stable runtime estimation across –20°C to +60°C ambient and varying load profiles. IC Role / Device Role / Timing Role: Core capacity estimator using adaptive cell modeling and 1-second RM updates to track capacity loss during field calibration cycles. Use Value: Maintains ±1% SOC accuracy after 300+ charge/discharge cycles by relearning FCC during qualified discharges and compensating for temperature-induced self-discharge. |
Use Scenario: Ruggedized handheld analyzers deployed in remote locations where battery replacement is infrequent and runtime predictability is mission-critical. IC Role / Device Role / Timing Role: Intelligent fuel gauge executing programmable near-full/low-threshold learning and RBI-backed register retention during extended storage. Use Value: Preserves learned capacity models and EDV settings for >10 years via 1 kB flash with 10-year data retention - eliminating recalibration after long-term shelf storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2084DBT-V123 | Identical die and functionality; differs only in packaging - DBT = tube, DBTR = tape-and-reel. Pinout, timing, and flash content are byte-for-byte identical. | No functional difference; DBTR variant optimized for automated SMT assembly; DBT suited for prototyping or low-volume hand soldering. | Select BQ2084DBTR-V123 for production line compatibility with pick-and-place feeders; use DBT only for evaluation or repair. |
| BQ2085DBTR-V123 | Successor device with enhanced 16-bit ADC linearity (INL < 0.004%), wider temperature range (–40°C to +85°C), and improved SMBus timeout handling - but requires updated firmware and flash programming. | Supports extended industrial environments and tighter accuracy specs; not drop-in compatible due to revised register map and calibration sequence. | Choose BQ2085DBTR-V123 only when new design requires –40°C operation or <0.5% end-of-discharge error; legacy BQ2084DBTR-V123 remains optimal for cost-sensitive SBS v1.1 deployments. |
Compared with BQ2084DBTR-V123, the DBT variant offers identical performance in tube packaging for manual assembly, while the BQ2085DBTR-V123 provides measurable accuracy and temperature-range improvements at the cost of firmware redesign and non-drop-in register compatibility - making BQ2084DBTR-V123 the optimal choice for validated SBS v1.1 implementations.
Availability
BQ2084DBTR-V123 is available at Aetrix Electronics and suitable for notebook PC battery packs, portable medical instrumentation, and industrial test equipment requiring stable component supply, long-lifecycle support, and SBS v1.1 compliance.
Supply support for BQ2084DBTR-V123 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 over 50 years of innovation in precision analog ICs.
The BQ2084DBTR-V123 belongs to TI's Smart Battery Fuel Gauge product line, engineered specifically for high-accuracy Li-ion/Li-polymer capacity tracking in portable systems requiring SBS v1.1 compliance and integrated AFE co-processing.
FAQ
What is the primary function of the BQ2084DBTR-V123 in a smart battery system?
The BQ2084DBTR-V123 serves as the core SBS v1.1–compliant fuel gauge IC, performing real-time coulomb counting via its integrating ADC, monitoring cell/pack voltage and temperature, and reporting RemainingCapacity(), Voltage(), and Temperature() over SMBus. It must be paired with the bq29312 AFE for protection and cell balancing - the BQ2084DBTR-V123 itself does not provide standalone protection.
Does the BQ2084DBTR-V123 support standalone operation without the bq29312 AFE?
No. The BQ2084DBTR-V123 requires the bq29312 AFE for critical functions including cell voltage monitoring (via VIN input), FET control (PCH/Discharge/Pre-Charge), cell balancing, and overvoltage/overcurrent protection. Its pinout and register map assume direct interconnection with bq29312 - the BQ2084DBTR-V123 lacks internal ADC channels for direct cell voltage measurement or FET gate drivers.
How does the BQ2084DBTR-V123 achieve <1% fuel gauge accuracy?
The BQ2084DBTR-V123 achieves <1% accuracy through three mechanisms: (1) self-calibrating integrating ADC with <1 µV offset error, (2) EDV-based RM corrections at three voltage thresholds (EDV0/EDV1/EDV2) tied to state-of-charge, and (3) programmable cell modeling using 1 kB flash to compensate for temperature, discharge rate, and aging effects - all validated per TI SLUS619B test data.
What is the role of the RBI pin on the BQ2084DBTR-V123?
The RBI (Register Backup Input) pin on the BQ2084DBTR-V123 accepts a backup voltage source (≥1.3 V) to retain flash memory contents and RAM registers during main supply dropout. It enables seamless recovery of learned FullChargeCapacity() and EDV thresholds after brownout events - critical for maintaining fuel gauge accuracy across power interruptions in portable systems.
Can the BQ2084DBTR-V123 drive LEDs directly without external transistors?
Yes. The BQ2084DBTR-V123 integrates five push-pull LED drivers (LED1–LED5) capable of sinking ≥10 mA each at VOL ≤ 0.4 V. This allows direct connection to standard 20-mA LEDs in 3-, 4-, or 5-segment configurations for remaining capacity indication - eliminating external driver transistors and reducing BOM count by up to six components.
BQ2084DBTR-V123 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-V123 FAQ
1.How can I place an order for BQ2084DBTR-V123 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2084DBTR-V123 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-V123 reliable?
The price and inventory of BQ2084DBTR-V123 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2084DBTR-V123 is usually 5 days.
3.What payment methods are accepted for BQ2084DBTR-V123?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2084DBTR-V123 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2084DBTR-V123?
BQ2084DBTR-V123 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2084DBTR-V123 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-V123?
For technical support, including BQ2084DBTR-V123 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2084DBTR-V123 requirements.
6.How does Aetrix verify that BQ2084DBTR-V123 is sourced from the original manufacturer or authorized distributors?
All BQ2084DBTR-V123 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-V123 meets industry standards.
7.What is the process for return or replacement of BQ2084DBTR-V123?
All BQ2084DBTR-V123 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2084DBTR-V123, 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-V123 part is unused and in its original packaging.
Return procedure for BQ2084DBTR-V123:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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