My Inquiry
My Account
Texas Instruments BQ20Z80DBT-V102
- Part No.:
- BQ20Z80DBT-V102
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ20Z80DBT-V102.pdf
- Description:
- IC GAS GAUGE BQ29312A 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,923
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BQ20Z80DBT-V102 from Texas Instruments is a SBS 1.1-compliant smart battery gas gauge IC with Impedance Track™ technology, designed for Li-ion/Li-polymer battery packs in notebook PCs and portable instrumentation. It delivers better than 1% gas-gauge accuracy over battery lifetime, integrates a 16-bit delta-sigma coulomb counter (0.65 nVh resolution), and operates with the bq29312A analog front-end for full pack protection and cell balancing.
For engineers reviewing the BQ20Z80DBT-V102 datasheet, BQ20Z80DBT-V102 pinout, BQ20Z80DBT-V102 application, or BQ20Z80DBT-V102 equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and confirmed alternative parts for smart battery system design and qualification.
Technical Context
The BQ20Z80DBT-V102 implements a dual-delta-sigma ADC architecture: one 16-bit integrating converter for current sensing (±0.25 V input range, <1 µV offset) and another for voltage/temperature measurement. It executes Impedance Track™ algorithms in real time using a low-power RISC CPU to model battery impedance, aging, and temperature-dependent capacity loss-enabling instant accuracy without learning cycles.
It interfaces exclusively via SMBus v1.1 (10–100 kHz) with PEC support and couples tightly with the bq29312A AFE through dedicated control signals (SAFE, XALERT, CLKOUT, DISP). Its safety architecture includes two-tier overvoltage/overcurrent/overtemperature protection, SHA-1 authentication, and lifetime data logging of 13 critical parameters including min/max cell voltage, charge/discharge current, and average temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gas Gauging Accuracy | Better than 1% error over full battery lifetime-enables reliable runtime prediction without recalibration cycles. |
| Coulomb Counter Resolution | 0.65 nVh-supports high-precision charge/discharge integration across wide current ranges (5–20 mΩ sense resistor). |
| Operating Temperature Range | –40°C to +85°C-qualified for industrial and portable computing environments with thermal derating. |
| SMBus Interface | v1.1 compliant, 10–100 kHz clock, PEC enabled-ensures interoperability with host systems adhering to Smart Battery Specification. |
| Power Modes | Normal (1 s update interval), Sleep (configurable interval), Shutdown (<0.1 µA)-reduces quiescent current during idle states. |
| Data Retention | 10-year flash memory retention-preserves lifetime logging data (max/min voltage, temperature, current) for warranty analysis. |
| Oscillator Options | Internal 32.768 kHz RC oscillator (±2% error) or external crystal-eliminates need for external timing components unless precision required. |
Pinout & Package
38-pin TSSOP (DBT) package with exposed thermal pad; RoHS-compliant, moisture sensitivity level 3. Pin functions are validated per TI SLUS681B datasheet revision January 2007.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Voltage measurement input | Connects to bq29312A CELL pin to read individual cell voltages via AFE multiplexing. |
| TS1 / TS2 | Thermistor voltage inputs | Interface dual NTC thermistors (e.g., Semitec 103AT) for environmental temperature monitoring. |
| SR1 / SR2 | Current sense differential inputs | Measure voltage drop across 5–20 mΩ sense resistor to compute charge/discharge flow. |
| SAFE (pins 7 & 12) | Dual-level safety outputs | Active-high and active-low complementary signals to trigger fuse blow or secondary protection events. |
| SMBC / SMBD | SMBus clock/data bidirectional | Open-drain I/O supporting SBS v1.1 communication with host controller at up to 100 kHz. |
| LED1–LED5 | LED display segment drivers | Directly drive 3-, 4-, or 5-segment LED indicators for remaining capacity visualization. |
| RBI | Backup power input | Accepts capacitor or battery to retain RAM and flash data during main supply dropout. |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ Algorithm | Real-time modeling of battery impedance, aging, and temperature effects-delivers >1% accuracy without full-charge/discharge learning. |
| Lifetime Data Logging | Records 13 critical metrics (e.g., lifetime max/min cell voltage, discharge current, temperature) in nonvolatile flash for field failure analysis. |
| Two-Tier Safety Architecture | First-level protection (OV/UV/OC/OT) and second-level fault escalation (cell imbalance, AFE error, fuse blow detection) with dual SAFE outputs. |
| Integrated Cell Balancing Control | Drives external FETs via bq29312A to equalize cell voltages during charging-prevents overcharge and extends usable pack energy. |
| SHA-1 Authentication | Enables secure host verification of battery authenticity-mitigates counterfeit battery risks in OEM systems. |
Applications
| Notebook PC Battery Packs | Medical Portable Devices |
|---|---|
Use Scenario: Integrated into removable Li-ion battery packs for business-class laptops requiring precise runtime estimation and SBS compliance. IC Role / Device Role / Timing Role: Primary gas gauge and safety manager-measures cell voltage, current, temperature, computes remaining capacity, and enforces protection thresholds. Use Value: Enables accurate "minutes remaining" display and prevents unsafe operation under overvoltage, overcurrent, or thermal stress conditions. |
Use Scenario: Used in battery-powered diagnostic equipment (e.g., handheld ultrasound, infusion pumps) where runtime predictability and regulatory traceability are critical. IC Role / Device Role / Timing Role: Smart battery fuel gauge with lifetime data logging-records min/max operating temperatures and voltage excursions for FDA audit trails. Use Value: Supports ISO 13485 compliance by storing 10+ years of operational history in on-chip flash memory. |
| Test & Measurement Equipment | Industrial Portable Instrumentation |
Use Scenario: Embedded in rechargeable battery modules for portable oscilloscopes, multimeters, and spectrum analyzers operating in variable ambient conditions. IC Role / Device Role / Timing Role: Gas gauge with auto-calibrating coulomb counter and dual thermistor inputs-compensates for self-heating and aging effects during extended field use. Use Value: Maintains <1% capacity error across 500+ charge cycles and –20°C to +60°C operating range without recalibration. |
Use Scenario: Deployed in ruggedized handheld analyzers (e.g., gas detectors, environmental monitors) requiring long service life and tamper-resistant battery authentication. IC Role / Device Role / Timing Role: Secure SBS-compliant fuel gauge with SHA-1 authentication-verifies genuine battery modules before enabling high-power operation. Use Value: Prevents unauthorized third-party batteries from compromising device safety certifications and calibration integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar smart battery gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ20Z75DBT | Same 38-pin TSSOP package and Impedance Track™ core, but lacks SHA-1 authentication and lifetime data logging features. | Suitable for cost-sensitive consumer notebooks where security and long-term analytics are not required. | Select when SBS v1.1 compliance and basic gas gauging suffice, and SHA-1 or 10-year logging are unnecessary. |
| BQ20Z95DBT | Successor with enhanced accuracy (<0.5%), expanded data logging (20+ parameters), and improved thermal compensation-pin-compatible with BQ20Z80DBT-V102. | Targeted at next-gen medical and industrial devices requiring tighter runtime tolerance and deeper diagnostics. | Choose for new designs needing higher accuracy and richer telemetry; supports seamless migration from BQ20Z80DBT-V102 layout. |
Compared with BQ20Z80DBT-V102, BQ20Z75DBT reduces security and logging capability for lower BOM cost, while BQ20Z95DBT extends accuracy and data depth without PCB changes-making it ideal for design refreshes demanding future-proofed telemetry.
Availability
BQ20Z80DBT-V102 is available at Aetrix Electronics and suitable for notebook PC battery packs, medical portable devices, test & measurement equipment, and industrial portable instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for BQ20Z80DBT-V102 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 BQ20Z80DBT-V102 belongs to TI's Smart Battery Fuel Gauge product line, engineered specifically for SBS-compliant Li-ion/Li-polymer battery packs requiring high-accuracy gauging, multi-tier safety, and lifetime data integrity in portable computing and medical applications.
FAQ
What is the primary function of the BQ20Z80DBT-V102 in a smart battery system?
The BQ20Z80DBT-V102 serves as the central gas gauge and safety manager in SBS-compliant battery packs. It measures cell voltage, current, and temperature using integrated delta-sigma ADCs; runs Impedance Track™ algorithms to compute remaining capacity with <1% lifetime error; and coordinates protection actions with the bq29312A AFE. The BQ20Z80DBT-V102 reports all data via SMBus v1.1 to the host system and logs critical lifetime metrics in on-chip flash memory.
Does the BQ20Z80DBT-V102 require an external crystal oscillator?
No-the BQ20Z80DBT-V102 includes an internal 32.768 kHz RC oscillator that eliminates the need for an external crystal. It can optionally use an external 12-pF crystal connected to pins XCK1 and XCK2 if higher timing accuracy is required. The device automatically selects the oscillator source on power-up: if no 100-kΩ resistor is present on ROSC (pin 33), it attempts crystal startup; otherwise, it uses the internal oscillator. Both sources cannot be used simultaneously.
How does the BQ20Z80DBT-V102 achieve better than 1% gas-gauge accuracy over battery lifetime?
The BQ20Z80DBT-V102 achieves <1% lifetime accuracy using patented Impedance Track™ technology, which continuously models battery impedance, state-of-health degradation, and temperature-dependent capacity loss in real time. Unlike coulomb counting alone, it correlates voltage, current, temperature, and open-circuit voltage measurements to adapt its capacity estimate across hundreds of cycles and varying ambient conditions-without requiring full-charge/discharge learning cycles. This algorithm runs on the device's embedded RISC CPU and is validated per TI SLUS681B.
What safety features does the BQ20Z80DBT-V102 provide, and how are they implemented?
The BQ20Z80DBT-V102 implements two independent safety tiers: first-level protection (cell/pack over/under-voltage, overcurrent, overtemperature) and second-level fault escalation (cell imbalance, AFE communication errors, fuse blow detection). These are enforced via programmable thresholds stored in data flash and executed by hardware comparators. Dual SAFE pins (7 and 12) provide complementary active-high/active-low outputs to drive external fuses or disable FETs. All safety logic is validated in conjunction with the bq29312A AFE per TI's reference design.
Can the BQ20Z80DBT-V102 drive LED indicators directly, and what configurations are supported?
Yes-the BQ20Z80DBT-V102 has five dedicated LED driver outputs (LED1–LED5) capable of directly driving external LEDs for remaining capacity indication. Firmware-configurable logic supports 3-, 4-, or 5-segment displays, with each output sinking up to 10 mA at 0.4 V drop. The DISP pin provides push-button interface capability for user-triggered display updates. No external drivers or current-limiting resistors are required for basic operation, though resistor selection may be needed depending on LED forward voltage and desired brightness.
BQ20Z80DBT-V102 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Impedance Track™
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- -
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage, Short Circuit
- Interface:
- SMBus
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP
BQ20Z80DBT-V102 FAQ
1.How can I place an order for BQ20Z80DBT-V102 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ20Z80DBT-V102 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 BQ20Z80DBT-V102 reliable?
The price and inventory of BQ20Z80DBT-V102 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ20Z80DBT-V102 is usually 5 days.
3.What payment methods are accepted for BQ20Z80DBT-V102?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ20Z80DBT-V102 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ20Z80DBT-V102?
BQ20Z80DBT-V102 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ20Z80DBT-V102 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 BQ20Z80DBT-V102?
For technical support, including BQ20Z80DBT-V102 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ20Z80DBT-V102 requirements.
6.How does Aetrix verify that BQ20Z80DBT-V102 is sourced from the original manufacturer or authorized distributors?
All BQ20Z80DBT-V102 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 BQ20Z80DBT-V102 meets industry standards.
7.What is the process for return or replacement of BQ20Z80DBT-V102?
All BQ20Z80DBT-V102 units undergo pre-shipment inspection (PSI). If there is an issue with BQ20Z80DBT-V102, 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 BQ20Z80DBT-V102 part is unused and in its original packaging.
Return procedure for BQ20Z80DBT-V102:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ20Z80DBT-V102 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…
