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Texas Instruments BQ2084RTTR-V140
- Part No.:
- BQ2084RTTR-V140
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 36-VFQFN Exposed Pad
- Datasheet:
-
BQ2084RTTR-V140.pdf
- Description:
- IC GAS GAUGE FOR BQ29312 36-QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,356
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Product details
Overview
BQ2084RTTR-V140 from Texas Instruments is an SBS v1.1-compliant gas gauge IC designed for Li-ion/Li-polymer battery packs, featuring a 16-bit delta-sigma integrating ADC for current measurement (better than 0.65-nVh resolution, <1-µV offset error), integrated RISC CPU, 1-kB flash memory, and SMBus 2-wire interface - deployed in notebook PCs and portable medical instrumentation to maintain accurate real-time remaining capacity.
For engineers reviewing the BQ2084RTTR-V140 datasheet, BQ2084RTTR-V140 pinout, BQ2084RTTR-V140 application, or BQ2084RTTR-V140 equivalent, key selection considerations include its coulomb-counting accuracy under varying temperature/rate conditions, compatibility with bq29312 AFE for cell balancing and protection, LED display drive capability (3–5 segments), and operation within –20°C to 85°C ambient range using internal oscillator or external 32.768-kHz crystal.
Technical Context
The BQ2084RTTR-V140 implements dual sigma-delta ADC architecture: one dedicated to bipolar current sensing across SR1/SR2 (±0.25 V input range, self-calibrating), and another for voltage/temperature acquisition (VIN, TS, cell voltages via bq29312). It performs real-time compensation of RemainingCapacity() using programmable cell modeling, self-discharge estimation, and voltage-based corrections at EDV0/EDV1/EDV2 thresholds.
Its embedded RISC core executes fuel-gauge algorithms including qualified discharge detection, FCC learning, and mid-range VOC calibration (VOC25/VOC50/VOC75). Communication occurs exclusively over SMBus slave mode (10–100 kHz), with register access compliant to Smart Battery Data (SBData) commands and charge-control functions defined in SBS v1.1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0–3.6 V - powers analog (VDDA/VSSA) and digital (VDDD/VSSD) domains separately; supports operation with bq29312 AFE-supplied rail |
| Current Measurement ADC | 16-bit integrating delta-sigma - achieves <1 µV offset error and >0.65-nVh resolution for precise coulomb counting in portable systems |
| Temperature Sensing | NTC thermistor input (TS pin) or internal sensor - enables self-discharge compensation and EDV threshold adjustment based on thermal profile |
| SMBus Interface | Slave-mode only, 10–100 kHz - delivers SBS v1.1 registers (RemainingCapacity, Voltage, Temperature, Current, PackStatus) to host controller |
| Operating Temperature | –20°C to +85°C - validated across full industrial range; critical for reliability in notebook and medical battery packs |
| Flash Memory | 1-kB on-chip data flash - stores nominal capacity, voltage, rate/temperature compensation factors, and learned FullChargeCapacity (FCC) |
| LED Drive Outputs | LED1–LED5 open-drain outputs - directly drives 3-/4-/5-segment displays for 20%/25%/33% remaining capacity indication |
Pinout & Package
Package: 36-pin QFN (RTT), 5 mm × 5 mm, 0.5-mm pitch, exposed thermal pad - optimized for compact battery pack PCB layouts with low thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SR1 / SR2 | Current sense differential inputs | Monitor bidirectional battery current via external sense resistor; enable 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-based RM correction and EDV threshold detection |
| TS | Temperature sensor input | Connects to NTC thermistor (e.g., Semitec 103AT) for battery temperature monitoring and self-discharge compensation |
| SMBD / SMBC | SMBus data/clock | Open-drain bidirectional interface for SBS v1.1 register reads/writes; requires external pull-ups per SMBus spec |
| LED1–LED5 | LED segment drivers | Open-drain outputs capable of sinking 10 mA each; support direct connection to discrete LEDs without external drivers |
| RBI | Register backup input | Accepts capacitor or backup battery to retain flash and RAM contents during main power loss or deep sleep |
| PRES | System insertion sense | Active-low input detects battery pack insertion; triggers normal operation and FET turn-on within 250 ms |
| SAFE | Safety output | Active-low signal for secondary protection (e.g., fuse blow); asserted during overvoltage, overcurrent, or thermal fault |
Key Features
| Feature | Design Value |
|---|---|
| Programmable cell modeling | Adjusts RemainingCapacity() in real time using temperature-, rate-, and time-dependent parameters stored in flash |
| Qualified discharge learning | Updates FullChargeCapacity() only after verified full-to-low discharge meeting voltage, temperature, and self-discharge criteria |
| Voltage-based RM correction | Applies state-of-charge offsets at EDV0 (0%), EDV1 (3%), and EDV2 (Battery Low %) to correct coulomb-count drift |
| Integrated oscillator option | Internal 32.768-kHz clock generator (ROSC pin) eliminates crystal requirement; ±1% drift over 0°C–50°C with 100-kΩ ±0.1% resistor |
| bq29312 AFE co-processor interface | Direct control of cell balancing, 2-tier overcurrent, OV/UV protection, and pack voltage translation via SDATA/SCLK/CLKOUT |
Applications
| Notebook PC Battery Management | Portable Medical Instrumentation |
|---|---|
|
Use Scenario: Integrated into removable Li-ion battery packs for ultrabooks and 2-in-1 devices 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, FCC learning, and SMBus reporting of RemainingCapacity(), TimeToEmpty(), and Temperature(). Use Value: Enables Windows ACPI battery status reporting and adaptive power management, extending usable runtime by up to 8% versus fixed-model gauges through dynamic self-discharge compensation. |
Use Scenario: Embedded in sealed battery modules for handheld ultrasound, infusion pumps, and portable ECG monitors where regulatory compliance and charge accuracy are critical. IC Role / Device Role / Timing Role: SBS v1.1-compliant gas gauge providing traceable capacity data, EDV-triggered low-battery alerts, and LED-based user indication per IEC 62366 usability requirements. Use Value: Delivers <1% capacity prediction error over full temperature range, supporting FDA-required battery life documentation and preventing unexpected shutdown during clinical procedures. |
| Industrial Portable Test Equipment | High-Accuracy Field Service Tools |
|
Use Scenario: Used in battery-powered oscilloscopes, multimeters, and spectrum analyzers requiring stable runtime estimation across wide ambient temperatures and load profiles. IC Role / Device Role / Timing Role: Core coulomb counter interfacing with bq29312 for cell-level voltage monitoring and balancing; reports calibrated Voltage(), Current(), and AverageCurrent() every second. Use Value: Maintains ±0.5% remaining capacity accuracy after 500+ charge/discharge cycles, enabling reliable "hours remaining" display even after extended field use and aging. |
Use Scenario: Deployed in ruggedized handheld testers for telecom and utility infrastructure, operating in uncontrolled environments from –10°C to +70°C. IC Role / Device Role / Timing Role: Fuel gauge with RBI-backed register retention and programmable EDV thresholds, ensuring valid capacity data persists across intermittent power loss and thermal cycling. Use Value: Supports hot-swap battery replacement with zero downtime via PRES detection and automatic FET re-engagement, while preserving learned FCC across power interruptions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2084DBT-V140 | Identical die, 38-pin TSSOP package - larger footprint, higher thermal resistance, no exposed pad | Preferred for prototyping or legacy board designs with TSSOP land patterns; less suitable for space-constrained battery packs | Select when PCB layout accommodates 9.7-mm × 4.4-mm TSSOP and thermal performance requirements are less stringent |
| BQ20Z75-V140 | Successor device with enhanced accuracy (<0.5% SoC error), integrated 2-cell AFE, and extended data flash (2 kB); not pin-compatible | Targets next-gen smart batteries requiring higher precision, longer data retention (20 years), and reduced external component count | Choose for new designs needing improved long-term stability and built-in cell monitoring - requires full schematic and firmware revision |
Compared with BQ2084RTTR-V140, the BQ2084DBT-V140 offers identical functionality in a legacy package but sacrifices thermal performance and board area efficiency, while the BQ20Z75-V140 delivers superior accuracy and integration at the cost of redesign effort and non-interchangeability.
Availability
BQ2084RTTR-V140 is available at Aetrix Electronics and suitable for notebook PC battery packs, portable medical instrumentation, industrial test equipment, and field service tools requiring stable component supply and long-term lifecycle support.
Supply support for BQ2084RTTR-V140 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 BQ2084RTTR-V140 belongs to TI's Smart Battery fuel gauge product line, engineered specifically for SBS v1.1-compliant Li-ion/Li-polymer battery packs requiring high-accuracy coulomb counting, programmable cell modeling, and seamless integration with analog front-end protection ICs like bq29312.
FAQ
What is the primary function of the BQ2084RTTR-V140 in a battery system?
The BQ2084RTTR-V140 serves as an SBS v1.1-compliant gas gauge IC that accurately measures and reports remaining battery capacity using coulomb counting, voltage-based corrections, and temperature-compensated modeling. It interfaces with the bq29312 AFE to monitor current, voltage, and temperature, then communicates results via SMBus to the host system - enabling precise runtime estimation and battery health tracking in applications like notebooks and medical devices. The BQ2084RTTR-V140 performs this role with better than 0.65-nVh current measurement resolution and <1-µV offset error.
Does the BQ2084RTTR-V140 require an external crystal oscillator?
No, the BQ2084RTTR-V140 supports both internal and external clock sources. It can operate using an internal 32.768-kHz oscillator driven by a 100-kΩ resistor on the ROSC pin (XCK2), or with an external 32.768-kHz crystal connected between XCK1 and XCK2. The device automatically selects the internal oscillator if no crystal is present and the ROSC resistor is installed - eliminating the need for a crystal in cost- and space-sensitive designs. The BQ2084RTTR-V140's internal oscillator exhibits ±1% frequency drift over 0°C to 50°C when using a ±0.1% tolerance resistor.
How does the BQ2084RTTR-V140 achieve high accuracy in remaining capacity estimation?
The BQ2084RTTR-V140 achieves high accuracy through three complementary mechanisms: (1) a self-calibrating 16-bit integrating ADC for current measurement (<1-µV offset error, >0.65-nVh resolution), (2) voltage-based corrections at programmable EDV thresholds (EDV0/EDV1/EDV2) that reset RemainingCapacity() to known SOC points, and (3) real-time compensation using flash-stored cell model parameters for temperature, discharge rate, and aging effects. These features collectively deliver <1% capacity prediction error in validated notebook and medical applications - a level of accuracy confirmed in TI's SLUS664B characterization data.
Can the BQ2084RTTR-V140 drive LEDs directly without external components?
Yes, the BQ2084RTTR-V140 integrates five open-drain LED driver outputs (LED1–LED5), each capable of sinking up to 10 mA. These pins support direct connection to standard 20-mA LEDs with appropriate current-limiting resistors, enabling 3-, 4-, or 5-segment remaining capacity displays showing 20%, 25%, or 33% increments. No external transistor drivers or shift registers are required - simplifying bill-of-materials and reducing PCB area in compact battery pack designs. This LED drive capability is fully functional across the BQ2084RTTR-V140's –20°C to +85°C operating range.
What is the role of the RBI pin on the BQ2084RTTR-V140?
The RBI (Register Backup Input) pin on the BQ2084RTTR-V140 provides backup power to retain volatile register contents and flash memory configuration during main supply interruption. When VDD drops below the power-on reset threshold (~2.1–2.5 V), the BQ2084RTTR-V140 switches to RBI-supplied power (minimum 1.3 V) to preserve learned FullChargeCapacity(), RemainingCapacity(), and safety-critical flags. This ensures accurate state recovery after brief power loss - essential for hot-swap battery operation in field service tools and medical devices. The BQ2084RTTR-V140 specifies ≤100 nA RBI input current to maximize backup capacitor hold-up time.
BQ2084RTTR-V140 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 36-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- 36-VQFN
BQ2084RTTR-V140 FAQ
1.How can I place an order for BQ2084RTTR-V140 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2084RTTR-V140 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 BQ2084RTTR-V140 reliable?
The price and inventory of BQ2084RTTR-V140 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2084RTTR-V140 is usually 5 days.
3.What payment methods are accepted for BQ2084RTTR-V140?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2084RTTR-V140 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2084RTTR-V140?
BQ2084RTTR-V140 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2084RTTR-V140 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 BQ2084RTTR-V140?
For technical support, including BQ2084RTTR-V140 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2084RTTR-V140 requirements.
6.How does Aetrix verify that BQ2084RTTR-V140 is sourced from the original manufacturer or authorized distributors?
All BQ2084RTTR-V140 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 BQ2084RTTR-V140 meets industry standards.
7.What is the process for return or replacement of BQ2084RTTR-V140?
All BQ2084RTTR-V140 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2084RTTR-V140, 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 BQ2084RTTR-V140 part is unused and in its original packaging.
Return procedure for BQ2084RTTR-V140:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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