My Inquiry
My Account
Texas Instruments BQ2084RTTR-V140G4
- Part No.:
- BQ2084RTTR-V140G4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 36-VFQFN Exposed Pad
- Datasheet:
-
BQ2084RTTR-V140G4.pdf
- Description:
- IC GAS GAUGE FOR BQ29312 36-QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,913
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BQ2084RTTR-V140 from Texas Instruments is an 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 (0.65-nVh resolution, <1-µV offset), supports SMBus 2-wire interface, integrates 1 kB flash for programmable cell modeling, and operates with the bq29312 analog front-end for full pack protection in 7.2-V to 14.4-V systems.
For engineers reviewing the BQ2084RTTR-V140 datasheet, BQ2084RTTR-V140 pinout, BQ2084RTTR-V140 application, or BQ2084RTTR-V140 equivalent, this page delivers verified technical context, validated pin functions, confirmed SBS v1.1 compliance, real-world LED display drive capability (3–5 segments), and precise integration requirements with the bq29312 AFE - all grounded in TI's SLUS664B revision August 2006 documentation.
Technical Context
The BQ2084RTTR-V140 implements a low-power RISC CPU core with integrated flash memory and dual 16-bit sigma-delta ADCs: one dedicated to high-precision current sensing (SR1/SR2 inputs, ±0.25 V range) and another for voltage/temperature measurement (VIN, TS, cell voltages via bq29312). It uses continuous sampling and auto-calibration to maintain <1% capacity prediction error.
It relies on external coordination with the bq29312 AFE for cell balancing, overvoltage/overcurrent protection, and pack-level voltage translation. Communication occurs over SMBus (10–100 kHz), while system timing is derived either from an internal 32.768-kHz oscillator (ROSC resistor-based) or external crystal - not both - with frequency drift ≤±1% over 0°C–50°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gas Gauge Standard | SBS v1.1 compliant; supports SBData commands, charge control, and host reporting of RemainingCapacity(), Voltage(), Temperature(), Current(), and runtime predictions. |
| Current Measurement | 16-bit integrating delta-sigma ADC; 0.65-nVh resolution, <1-µV offset error; enables accurate coulomb counting for Li-ion/Li-polymer battery fuel gauging. |
| Voltage/Temperature ADC | 16-bit delta-sigma converter; measures pack voltage (VIN), thermistor input (TS), and individual cell voltages via bq29312 interface with <1% error. |
| Operating Supply | VDD = 3.0–3.6 V; supports –20°C to +85°C ambient; digital supply (VDDD) and analog supply (VDDA) are separate pins for noise isolation. |
| Memory & Calibration | 1 kB internal data flash stores nominal capacity, self-discharge rate, rate/temperature compensation factors, and learned FullChargeCapacity(); auto-calibrates SR1/SR2 offset during SMBus idle ≥20 s. |
| LED Interface | Drives 3-, 4-, or 5-segment LED display via LED1–LED5 outputs; supports 20%, 25%, or 33% remaining capacity increments for visual state-of-charge indication. |
| Communication Bus | SMBus 2-wire interface (SMBC/SMBD); supports slave mode up to 100 kHz; includes timeout detection (25–35 ms), clock stretching, and robust error signaling. |
Pinout & Package
Package: 36-pin QFN (RTT), 0.5-mm pitch, 6 mm × 6 mm body, exposed thermal pad. Pinout validated per TI SLUS664B (August 2006) pin assignment diagrams and terminal function table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SR1 / SR2 | Current sense differential input | Monitors voltage across external sense resistor (5–30 mΩ); enables bipolar charge/discharge current measurement (±0.25 V range). |
| VIN | Analog input | Receives scaled cell/pack voltage from bq29312 CELL output; used for voltage-based RM correction and EDV threshold detection. |
| TS | Temperature sensor input | Accepts NTC thermistor (e.g., Semitec 103AT) or internal temperature sensor; enables temperature-compensated self-discharge and capacity modeling. |
| SMBD / SMBC | SMBus bidirectional data/clock | Open-drain I/O pins for SBS-compliant communication with host controller; support standard SMBus timing (10–100 kHz). |
| LED1–LED5 | LED segment drivers | Push-pull outputs capable of sinking 10 mA each; directly drive external LEDs for remaining capacity indication without external transistors. |
| RBI | Register backup input | Accepts capacitor or battery backup voltage (≥1.3 V) to retain flash and RAM contents during main supply brownout or removal. |
| PRES | System insertion sense | Active-low input detecting battery pack insertion; triggers normal operation, FET enable, and PRES bit assertion in PackStatus(). |
| SAFE | Safety output | Active-low signal for secondary protection (e.g., fuse blow); asserted under critical fault conditions detected by bq29312 coordination. |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating integrating ADC | Eliminates manual offset trimming; achieves <1-µV offset error via automatic SR1/SR2 short-and-measure during SMBus idle ≥20 s. |
| Programmable cell modeling | Enables dynamic adjustment of remaining capacity using user-defined data flash parameters for time, rate, and temperature compensation. |
| Integrated 1 kB flash memory | Stores configuration, learned FCC, and calibration data; eliminates need for external EEPROM and reduces BOM count and layout area. |
| 32.768-kHz oscillator option | Supports either internal resistor-based (ROSC pin) or external crystal (XCK1/XCK2 pins) timing source - not both - with ≤±1% drift over 0°C–50°C. |
| SBS v1.1 register compatibility | Provides direct access to standard Smart Battery Data registers (e.g., RemainingCapacity, Voltage, Temperature, AtRate) via SMBus without host-side translation. |
Applications
| Notebook PCs | Medical Portable Devices |
|---|---|
Use Scenario: Integrated into removable Li-ion battery packs for ultraportable laptops requiring accurate runtime estimation and SBS-compliant host communication. IC Role / Device Role / Timing Role: Primary fuel gauge IC coordinating with bq29312 AFE to monitor charge/discharge, cell balance, and safety thresholds; reports RemainingCapacity() and runtime via SMBus. Use Value: Enables precise end-of-discharge prediction (EDV0–EDV2) and voltage-based RM correction, extending usable runtime by avoiding premature shutdown. |
Use Scenario: Embedded in sealed medical battery modules (e.g., infusion pumps, portable monitors) where regulatory traceability and capacity accuracy are critical. IC Role / Device Role / Timing Role: Gas gauge and safety coordinator; uses internal temperature sensor or NTC thermistor to compensate self-discharge and validate charge cycles per IEC 62366. Use Value: Maintains <1% capacity prediction error across temperature and discharge rates, supporting FDA-required battery life consistency and recalibration logging. |
| Industrial Test Equipment | Portable Instrumentation |
Use Scenario: Used in handheld multimeters and oscilloscopes with hot-swappable Li-polymer packs needing reliable low-power state-of-charge feedback. IC Role / Device Role / Timing Role: Standalone fuel gauge with LED driver outputs; manages power mode transitions (e.g., sleep → active) based on PRES and SMBus activity. Use Value: Delivers 3–5 segment LED indication with 20%/25%/33% granularity, enabling intuitive battery status without host MCU intervention. |
Use Scenario: Deployed in field-deployable gas analyzers and environmental sensors powered by 3S/4S Li-ion packs operating in variable-temperature environments. IC Role / Device Role / Timing Role: Adaptive fuel gauge using programmable cell modeling to adjust capacity estimates for temperature-dependent self-discharge and aging effects. Use Value: Learns true FullChargeCapacity() during qualified discharges, improving long-term accuracy beyond initial factory calibration by >30% over 200 cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar smart battery fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2084DBT-V140 | Same die, 38-pin TSSOP package; larger footprint (12.5 × 6.1 mm vs. 6 × 6 mm), higher thermal resistance, no exposed pad. | Preferred for prototyping or legacy PCBs with TSSOP land patterns; less suitable for space-constrained portable designs. | Select when board layout accommodates TSSOP or when evaluating firmware compatibility before migrating to RTT. |
| BQ20Z70-V140 | Successor device with enhanced SBS v1.1+ features, integrated 5-V regulator, improved ADC linearity (0.004% INL), and extended data flash (2 kB). | Supports higher cell counts (up to 6S), adds SHA-1 authentication, and enables secure battery authentication in OEM systems. | Choose for new designs requiring longer lifecycle support, cryptographic security, or tighter voltage measurement tolerance (<0.01% error). |
Compared with BQ2084RTTR-V140, the BQ2084DBT-V140 offers identical functionality in a legacy package but sacrifices thermal performance and board density, while the BQ20Z70-V140 provides measurable improvements in measurement fidelity, security, and scalability - making it suitable for next-generation certified battery systems.
Availability
BQ2084RTTR-V140 is available at Aetrix Electronics and suitable for notebook PC battery packs, portable medical instrumentation, industrial test equipment, and field-deployable analyzers requiring stable component supply, long-term obsolescence management, and SBS v1.1 compliance.
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 experience in battery management IC design.
The BQ2084RTTR-V140 belongs to TI's Smart Battery Fuel Gauge product line, engineered specifically for high-accuracy coulomb counting and SBS v1.1 interoperability in multi-cell Li-ion/Li-polymer battery packs used in portable computing and mission-critical portable devices.
FAQ
What is the primary function of the BQ2084RTTR-V140 in a battery management system?
The BQ2084RTTR-V140 serves as an SBS v1.1-compliant gas gauge IC that accurately measures and reports remaining battery capacity, voltage, temperature, and current via SMBus. It performs coulomb counting using a 16-bit integrating ADC, coordinates with the bq29312 AFE for protection and cell balancing, and drives LED indicators - all within a single 36-pin QFN package. Its core role is fuel gauging, not cell protection or charging control.
Does the BQ2084RTTR-V140 require an external crystal oscillator?
No - the BQ2084RTTR-V140 supports two oscillator configurations: internal (using a 100-kΩ resistor on ROSC pin) or external (32.768-kHz crystal on XCK1/XCK2 pins), but not both simultaneously. The internal option achieves ≤±1% frequency drift over 0°C–50°C with a ±0.1% tolerance resistor; the external crystal option improves long-term stability but requires additional layout care and component cost. Both modes are fully supported in the BQ2084RTTR-V140.
How does the BQ2084RTTR-V140 achieve accurate capacity tracking over time?
The BQ2084RTTR-V140 achieves long-term capacity accuracy through three mechanisms: (1) auto-calibration of SR1/SR2 offset during SMBus idle ≥20 s, reducing error to <1 µV; (2) programmable cell modeling stored in 1 kB flash, adjusting for temperature-, rate-, and time-dependent self-discharge; and (3) qualified discharge learning, which updates FullChargeCapacity() after a full discharge from near-full to EDV2 with validated conditions - all implemented natively in the BQ2084RTTR-V140 without host intervention.
Can the BQ2084RTTR-V140 operate without the bq29312 analog front-end?
No - the BQ2084RTTR-V140 is explicitly designed to work with the bq29312 AFE. It relies on the bq29312 for cell voltage monitoring (via VIN), protection logic (OV/UV/OC), cell balancing control, and power delivery (VDD generation from 2S–4S stacks). While the BQ2084RTTR-V140 handles computation and communication, it lacks standalone protection circuitry, sense FET drivers, or high-voltage analog interfaces - making the bq29312 essential for functional operation of the BQ2084RTTR-V140.
What are the key differences between BQ2084RTTR-V140 and BQ20Z70-V140?
The BQ20Z70-V140 is a functional successor with higher precision (0.004% INL vs. 0.018%), 2 kB flash (vs. 1 kB), integrated 5-V LDO, SHA-1 authentication, and support for up to 6-series cells. Unlike the BQ2084RTTR-V140, it does not require an external AFE for basic protection and includes enhanced SBS v1.1+ extensions. However, the BQ2084RTTR-V140 remains valid for cost-sensitive, space-constrained, or legacy SBS v1.1-only designs where those advanced features are unnecessary.
BQ2084RTTR-V140G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 36-VFQFN Exposed Pad
- 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:
- 36-VQFN
BQ2084RTTR-V140G4 FAQ
1.How can I place an order for BQ2084RTTR-V140G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2084RTTR-V140G4 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-V140G4 reliable?
The price and inventory of BQ2084RTTR-V140G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2084RTTR-V140G4 is usually 5 days.
3.What payment methods are accepted for BQ2084RTTR-V140G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2084RTTR-V140G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2084RTTR-V140G4?
BQ2084RTTR-V140G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2084RTTR-V140G4 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-V140G4?
For technical support, including BQ2084RTTR-V140G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2084RTTR-V140G4 requirements.
6.How does Aetrix verify that BQ2084RTTR-V140G4 is sourced from the original manufacturer or authorized distributors?
All BQ2084RTTR-V140G4 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-V140G4 meets industry standards.
7.What is the process for return or replacement of BQ2084RTTR-V140G4?
All BQ2084RTTR-V140G4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2084RTTR-V140G4, 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-V140G4 part is unused and in its original packaging.
Return procedure for BQ2084RTTR-V140G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ2084RTTR-V140G4 Tags
-
BQ29700DSER
Texas Instruments
-
S-8241ABKMC-GBKT2G
ABLIC Inc.
-
S-8241ABPMC-GBPT2G
ABLIC Inc.
-
BQ27427YZFR
Texas Instruments
-
BQ27426YZFR
Texas Instruments
-
STC3117IJT
STMicroelectronics
-
STC3115IJT
STMicroelectronics
-
BQ76925RGER
Texas Instruments
-
NPM1100-QDAA-R
Nordic Semiconductor ASA
-
BQ27441DRZR-G1A
Texas Instruments
-
STC3115AIQT
STMicroelectronics
-
S-8252AAL-M6T1U
ABLIC Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
