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Texas Instruments BQ2085DBTR-V1P3
- Part No.:
- BQ2085DBTR-V1P3
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2085DBTR-V1P3.pdf
- Description:
- IC GAS GAUGE FOR BQ29311 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,874
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Product details
Overview
BQ2085DBTR-V1P3 from Texas Instruments is a Smart Battery Specification (SBS) v1.1-compliant gas gauge IC for Li-ion/Li-polymer battery packs. It performs coulomb counting with better than 3-nVh resolution, self-calibrating integrating ADC (offset <1 µV), and 16-bit delta-sigma ADCs for voltage/temperature - enabling accurate remaining capacity reporting in notebook PCs and portable medical instrumentation.
For engineers reviewing the BQ2085DBTR-V1P3 datasheet, BQ2085DBTR-V1P3 pinout, BQ2085DBTR-V1P3 application, or BQ2085DBTR-V1P3 equivalent, key selection criteria include SMBus 2-wire interface compliance, integrated 32.768-kHz oscillator (no external crystal), 512-byte flash for programmable cell modeling, LED display driver support (3–5 segments), and glueless interoperability with bq29311 AFE protection IC.
Technical Context
The BQ2085DBTR-V1P3 implements dual sigma-delta ADC architecture: one 16-bit integrating converter for high-precision current sensing across SR1/SR2 (−0.3 V to +1.0 V input range, 1 µV offset), and a second 16-bit delta-sigma ADC for voltage (VIN) and temperature (TS) measurement. It operates with continuous 1-second sampling intervals and supports automatic offset calibration triggered by 20 s SMBus idle.
Its RISC CPU core executes fuel-gauge algorithms including dynamic self-discharge compensation (temperature-dependent scaling per Table 4), qualified discharge learning for FullChargeCapacity (FCC) updates, and voltage-based RM corrections at EDV0/EDV1/EDV2 thresholds. Communication occurs exclusively via SMBus 2-wire protocol (10–100 kHz slave mode), with dedicated SMBC/SMBD pins and built-in level translation for host controller interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0–3.6 V (VDDA/VDDD); enables stable operation across Li-ion pack voltage ranges without external LDO when paired with bq29311 |
| Current Measurement Resolution | <3-nVh; achieves sub-mAh accuracy over multi-hour discharge cycles without external calibration components |
| ADC Offset Error | <1 µV (typical); eliminates need for manual zero-point trimming during production calibration |
| SMBus Frequency | 10–100 kHz (slave mode); ensures compatibility with standard system management controllers in SBS-compliant hosts |
| Internal Oscillator | 32.768 kHz ±2% (±1% at VDD = 3.3 V); removes external crystal requirement and reduces BOM count |
| Data Flash Memory | 512 bytes; stores nominal capacity, self-discharge rate, rate/temp compensation factors, and learned FCC values |
| Operating Temperature | −20°C to +85°C; supports industrial-grade battery pack deployment in medical and test equipment |
| LED Drive Capability | 5-channel open-drain outputs (LED1–LED5); directly drives 3-/4-/5-segment displays for visual state-of-charge indication |
Pinout & Package
38-pin TSSOP (DBT) package with exposed thermal pad; RoHS-compliant, tape-and-reel delivery (R suffix). Pin functions validated per TI SLUS598 datasheet Rev. FEBRUARY 2004.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SR1 / SR2 | Current sense differential inputs | Accepts voltage drop across 10–20 mΩ sense resistor; enables bidirectional coulomb counting with <1 µV offset error |
| VIN | Analog voltage input | Receives scaled cell voltage from bq29311 VCELL pin; used for pack-level voltage reporting and EDV threshold detection |
| TS | Temperature sensor input | Interfaces with NTC thermistor (e.g., Semitec 103AT) or internal sensor; enables temperature-compensated self-discharge estimation |
| SMBC / SMBD | SMBus clock/data I/O | Open-drain bidirectional pins compliant with SMBus v2.0; support standard battery status queries (e.g., RemainingCapacity, Voltage, Current) |
| LED1–LED5 | LED segment drivers | Open-drain outputs capable of sinking ≥10 mA each; support direct connection to common-anode LED displays |
| SAFE | Safety control output | Asserts active-low signal for external fuse blow or secondary protection activation based on critical fault conditions |
| RBI | Register backup supply | Accepts capacitor or battery input (≥1.3 V) to retain data registers during main supply brownout or removal |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating integrating ADC | Automatically cancels SR1/SR2 offset down to <1 µV during 20 s SMBus idle - eliminates factory calibration step |
| Programmable cell modeling | 512-byte flash stores chemistry-specific parameters (e.g., self-discharge rate, rate compensation) to adapt RM calculation to real-world aging |
| Glueless bq29311 interface | Dedicated SCLK/SDATA lines and level-translated signals enable direct connection to TI's AFE without discrete logic or voltage translators |
| Voltage-based RM correction | Applies precise capacity adjustments at three EDV thresholds (EDV0=0%, EDV1=3%, EDV2=Battery Low%) using actual pack voltage - improves low-SOC accuracy |
| Temperature-compensated self-discharge | Scales discharge rate exponentially with temperature (doubling per +10°C above 25°C) using lookup table stored in flash - maintains calendar-life accuracy |
Applications
| Notebook PC Battery Management | Portable Medical Instrumentation |
|---|---|
Use Scenario: Integrated smart battery pack for ultrabooks requiring precise runtime prediction and SBS v1.1 compliance. IC Role / Device Role / Timing Role: Primary fuel gauge IC performing real-time coulomb counting, voltage/temperature monitoring, and SMBus communication with host EC. Use Value: Delivers ±1% remaining capacity accuracy over full charge/discharge cycle using learned FCC and midrange VOC corrections - extends perceived battery life via reliable low-power warnings. |
Use Scenario: Rechargeable battery module in handheld diagnostic devices where safety-critical runtime estimation is mandated. IC Role / Device Role / Timing Role: Safety-augmented gas gauge coordinating with bq29311 AFE for cell balancing, overvoltage/undervoltage protection, and thermal fault signaling. Use Value: Enables FDA-aligned battery certification through deterministic EDV-based shutdown (EDV0=0%) and SAFE output-driven fuse activation - prevents unsafe deep discharge. |
| Test & Measurement Equipment | Industrial Portable Instrumentation |
Use Scenario: Field-deployable calibration tool with long shelf life and infrequent usage requiring accurate state-of-charge retention. IC Role / Device Role / Timing Role: Standalone capacity estimator applying temperature-adaptive self-discharge modeling during storage and wake-on-demand operation. Use Value: Maintains ≤3% capacity drift over 6-month storage at 35°C using programmable 2.5%/day baseline and exponential temperature scaling - eliminates recalibration visits. |
Use Scenario: Ruggedized handheld analyzer operating in variable ambient temperatures (-20°C to +70°C) with no user-accessible battery service. IC Role / Device Role / Timing Role: Embedded fuel gauge executing qualified discharge learning to auto-adapt FCC to actual field aging under mixed load profiles. Use Value: Achieves >95% end-of-life capacity tracking accuracy by updating FCC only after verified full-range discharges meeting current/voltage/temperature constraints - reduces warranty claims. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2084DBTR-V1P3 | Identical pinout and firmware interface, but lacks LED drivers (no LED1–LED5 pins) and DISP input; same 38-pin TSSOP package. | Requires external LED driver circuitry; suitable only when visual SOC indication is handled by host MCU or separate display controller. | Select BQ2084DBTR-V1P3 only if LED display functionality is unnecessary and board space allows discrete driver implementation. |
| BQ20Z75-V150 | Successor generation with enhanced 16-bit ADC linearity (0.003% INL vs. unspecified for BQ2085), extended temperature range (−40°C to +85°C), and added SHA-1 authentication engine. | Supports secure battery authentication required in OEM laptop platforms; not SBS v1.1 certified - uses custom command set. | Choose BQ20Z75-V150 for new designs needing cryptographic security or wider temp range; avoid for legacy SBS v1.1 systems due to non-drop-in firmware compatibility. |
Compared with BQ2084DBTR-V1P3, the BQ2085DBTR-V1P3 adds integrated LED drivers for direct display control - reducing component count and layout complexity. Against BQ20Z75-V150, it offers strict SBS v1.1 compliance and simpler firmware integration at the cost of missing security features and narrower temperature rating.
Availability
BQ2085DBTR-V1P3 is available at Aetrix Electronics and suitable for notebook PC battery packs, portable medical instrumentation, test & measurement equipment, and industrial portable instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for BQ2085DBTR-V1P3 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 BQ2085DBTR-V1P3 belongs to TI's Smart Battery Fuel Gauge product line, designed specifically for SBS v1.1-compliant Li-ion/Li-polymer battery packs in portable computing and mission-critical portable electronics.
FAQ
What is the primary function of the BQ2085DBTR-V1P3 in a battery system?
The BQ2085DBTR-V1P3 serves as a Smart Battery Specification (SBS) v1.1-compliant fuel gauge IC that accurately measures and reports remaining battery capacity using coulomb counting, voltage, and temperature data. It communicates results via SMBus to the host system and supports LED-based state-of-charge indication - all while operating with minimal external components when paired with the bq29311 AFE.
Does the BQ2085DBTR-V1P3 require an external crystal oscillator?
No, the BQ2085DBTR-V1P3 integrates a 32.768-kHz oscillator with ±2% frequency accuracy (±1% at 3.3 V), eliminating the need for an external crystal. This is achieved using an internal time base bias input (ROSC pin) connected to an 113-kΩ precision resistor, simplifying PCB layout and reducing BOM cost.
How does the BQ2085DBTR-V1P3 achieve high-accuracy current measurement?
The BQ2085DBTR-V1P3 uses a self-calibrating 16-bit integrating ADC with better than 3-nVh resolution and less than 1 µV offset error. It continuously samples the voltage across the SR1/SR2 sense resistor (10–20 mΩ), performs automatic offset cancellation during SMBus idle periods, and applies temperature- and rate-compensated algorithms to deliver precise coulomb counts for remaining capacity calculation.
Can the BQ2085DBTR-V1P3 operate independently without the bq29311 AFE?
No - the BQ2085DBTR-V1P3 is designed for glueless interoperability with the bq29311 AFE. While it can monitor VIN and TS directly, critical functions like cell voltage monitoring (VCELL1–VCELL4), safety control (SAFE), and power delivery rely on the bq29311 interface via SCLK/SDATA lines. Operating without bq29311 limits functionality to single-point voltage and basic current sensing.
What type of memory does the BQ2085DBTR-V1P3 use to store configuration data?
The BQ2085DBTR-V1P3 contains 512 bytes of internal data flash memory. This nonvolatile memory stores programmable parameters including nominal capacity, self-discharge rate, temperature compensation coefficients, EDV thresholds, and learned FullChargeCapacity (FCC) values - enabling adaptive fuel gauging without external EEPROM.
How does the BQ2085DBTR-V1P3 handle battery self-discharge during storage?
The BQ2085DBTR-V1P3 applies temperature-compensated self-discharge modeling using a programmable baseline rate (e.g., 2.5%/day at 25°C) scaled exponentially: rate doubles per +10°C and halves per −10°C. This algorithm adjusts RemainingCapacity every 250 ms during awake mode and periodically in sleep mode - maintaining accuracy over months of shelf storage.
BQ2085DBTR-V1P3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- SMBus
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP
BQ2085DBTR-V1P3 FAQ
1.How can I place an order for BQ2085DBTR-V1P3 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2085DBTR-V1P3 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 BQ2085DBTR-V1P3 reliable?
The price and inventory of BQ2085DBTR-V1P3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2085DBTR-V1P3 is usually 5 days.
3.What payment methods are accepted for BQ2085DBTR-V1P3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2085DBTR-V1P3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2085DBTR-V1P3?
BQ2085DBTR-V1P3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2085DBTR-V1P3 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 BQ2085DBTR-V1P3?
For technical support, including BQ2085DBTR-V1P3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2085DBTR-V1P3 requirements.
6.How does Aetrix verify that BQ2085DBTR-V1P3 is sourced from the original manufacturer or authorized distributors?
All BQ2085DBTR-V1P3 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 BQ2085DBTR-V1P3 meets industry standards.
7.What is the process for return or replacement of BQ2085DBTR-V1P3?
All BQ2085DBTR-V1P3 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2085DBTR-V1P3, 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 BQ2085DBTR-V1P3 part is unused and in its original packaging.
Return procedure for BQ2085DBTR-V1P3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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