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Texas Instruments BQ20Z80DBT
- Part No.:
- BQ20Z80DBT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ20Z80DBT.pdf
- Description:
- IC ADV GAS GAUGE LI-ION 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,061
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Product details
Overview
BQ20Z80DBT from Texas Instruments is a SBS 1.1-compliant gas gauge IC with Impedance Track™ technology, designed for Li-ion/Li-polymer battery packs in notebook PCs and portable instrumentation. It integrates a 16-bit delta-sigma ADC (0.65 nVh resolution), RISC CPU, 768-byte user flash, and SMBus v1.1 interface. It operates with the bq29312A AFE to deliver <1% gas-gauge error over battery lifetime without learning cycles.
For engineers reviewing the BQ20Z80DBT datasheet, BQ20Z80DBT pinout, BQ20Z80DBT application, or BQ20Z80DBT equivalent, this page delivers verified technical context, validated pin functions, real-world protection features, and confirmed alternative options for smart battery pack design and qualification.
Technical Context
The BQ20Z80DBT implements a dual-delta-sigma ADC architecture: one for high-precision current sensing (±0.25 V input range, <1 μV offset) and another for cell voltage/temperature measurement. Its Impedance Track™ algorithm continuously models battery impedance using voltage, current, temperature, and aging data to compute remaining capacity independent of discharge rate.
It executes safety-critical decisions in firmware-including primary (cell OV/UV, 3× discharge OC) and secondary (fuse-blow via SAFE pins 7/12) protection-and supports configurable power modes (Normal/Sleep/Shutdown) with 8 μA sleep current when paired with bq29312A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gas Gauge Accuracy | Better than 1% error over battery lifetime; no full-charge/discharge learning cycle required. |
| Coulomb Counter Resolution | 0.65 nVh-enables sub-milliamp-hour charge/discharge integration accuracy. |
| Operating Temperature | –40°C to +85°C-supports industrial and mobile computing environments. |
| SMBus Compliance | SBS v1.1 with PEC; 10–100 kHz clock frequency-ensures interoperability with host controllers. |
| Power Supply | VDDA/VDDD = 3.0–3.6 V; shutdown current = 0.1 μA-minimizes quiescent drain in storage. |
| Package | 38-pin TSSOP (DBT)-surface-mount compatible with standard reflow profiles. |
| Flash Memory | 768 bytes user-programmable flash-stores calibration, configuration, and lifetime logging data. |
Pinout & Package
38-pin TSSOP (DBT) package with exposed thermal pad; RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Voltage measurement input | Connects to bq29312A CELL output to read individual cell voltages via AFE multiplexing. |
| TS1 / TS2 | Thermistor analog inputs | Support dual NTC thermistors (e.g., Semitec 103AT) for environmental temperature monitoring. |
| SR1 / SR2 | Current sense differential inputs | Interface to 5–20 mΩ sense resistor; measures ±0.25 V differential for charge/discharge flow. |
| SAFE (7 & 12) | Dual-level safety outputs | Active-high and active-low complementary signals to trigger fuse blow on critical faults (e.g., cell imbalance, AFE comm error). |
| SMBD / SMBC | SMBus bidirectional interface | Open-drain pins compliant with SBS v1.1; support PEC and broadcast commands for host communication. |
| LED1–LED5 | LED segment drivers | Direct-drive outputs for 3-/4-/5-segment LED fuel gauges; firmware-configurable blink patterns. |
| 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™ Technology | Real-time battery impedance modeling enables accurate SoC estimation across aging, temperature, and load conditions-no periodic recalibration needed. |
| Lifetime Data Logging | Records 13 critical parameters (e.g., lifetime min/max cell voltage, avg discharge current) in nonvolatile memory for warranty analysis and field failure root cause. |
| SHA-1 Authentication | Enables secure host verification of battery authenticity and prevents counterfeit pack insertion in certified systems. |
| Cell Balancing Control | Firmware-managed balancing algorithm adjusts duty cycle (0.2–0.4) per configured cell count to equalize voltages during charging and extend usable pack energy. |
| Auto-Calibration | Self-cancels SR1/SR2 offset error (<1 μV) when SMBus lines are held low ≥5 s-eliminates need for external calibration hardware. |
Applications
| Notebook PC Battery Packs | Medical Portable Devices |
|---|---|
Use Scenario: Integrated into 3–5 cell Li-ion packs for ultrabooks and 2-in-1 convertibles requiring precise runtime prediction and OEM authentication. IC Role / Device Role / Timing Role: Primary SBS-compliant gas gauge and safety manager; communicates SoC, SoH, and alarms via SMBus to EC/BIOS. Use Value: Delivers <1% SoC error over 500+ cycles, enabling accurate low-battery warnings and preventing unexpected shutdowns during critical tasks. | Use Scenario: Used in battery-powered infusion pumps and handheld diagnostic tools where regulatory compliance and traceable lifetime data are mandatory. IC Role / Device Role / Timing Role: Fuel gauge and safety monitor with lifetime logging; reports max/min temperature/voltage for FDA audit trails. Use Value: Lifetime data logging meets IEC 62304 requirements; SHA-1 authentication ensures only approved batteries operate the device. |
| Test & Measurement Equipment | Industrial Portable Instrumentation |
Use Scenario: Embedded in rechargeable battery packs for oscilloscopes, multimeters, and spectrum analyzers needing stable runtime under variable loads. IC Role / Device Role / Timing Role: Gas gauge with pulse charging support and pre-charge control; interfaces to host MCU via SMBus for dynamic charge profile adjustment. Use Value: Pulse charging feature reduces recharge time by up to 25% vs. constant-current-only methods-critical for lab throughput. | Use Scenario: Deployed in ruggedized handheld meters and gas detectors operating in wide ambient temperatures (–20°C to +60°C). IC Role / Device Role / Timing Role: Dual-thermistor monitoring (TS1/TS2) and robust overtemperature protection with hysteresis ensure safe operation in harsh environments. Use Value: –40°C to +85°C operating range and 2nd-level safety alerts (via SAFE pins) prevent thermal runaway during extended field use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ20Z90DBT | Enhanced firmware (V110); adds Remaining Energy Alarm and extended LED hold time (255 s vs. 16 s). | Required for SBS-compliant energy-based alarms and longer display persistence in premium notebooks. | Select BQ20Z90DBT if energy-based alarm thresholds and extended LED visibility are system requirements. |
| BQ20Z75DBT | Earlier generation; lacks SHA-1 authentication, lifetime logging, and pulse charging support. | Suitable for cost-sensitive, non-authenticated battery packs without regulatory data retention needs. | Choose BQ20Z75DBT only for legacy designs where security and field analytics are not mandated. |
Compared with BQ20Z80DBT, BQ20Z90DBT adds energy-based alarms and longer LED timing but shares identical pinout, firmware structure, and Impedance Track™core; BQ20Z75DBT omits authentication and logging-making it unsuitable for medical or authenticated systems.
Availability
BQ20Z80DBT is available at Aetrix Electronics and suitable for notebook PC battery packs, medical portable devices, and industrial instrumentation requiring stable component supply, long-term lifecycle support, and SBS 1.1 compliance.
Supply support for BQ20Z80DBT 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 battery management expertise.
The BQ20Z80DBT belongs to TI's Smart Battery Manager product line, engineered specifically for high-accuracy, SBS-compliant gas gauging in multi-cell Li-ion packs used in portable computing and mission-critical portable equipment.
FAQ
What is the primary function of the BQ20Z80DBT in a smart battery system?
The BQ20Z80DBT serves as the core SBS 1.1-compliant gas gauge and safety manager in smart battery packs. It uses Impedance Track™ technology to calculate remaining capacity with <1% error over battery life, monitors cell voltage, current, and temperature via integrated delta-sigma ADCs, and enforces primary and secondary protection-always in conjunction with the bq29312A AFE. The BQ20Z80DBT delivers real-time SoC, SoH, and fault status over SMBus to the host system.
Does the BQ20Z80DBT require an external crystal oscillator?
No-the BQ20Z80DBT supports both internal and external 32.768 kHz oscillators. By default, it attempts internal oscillation using a 100-kΩ resistor on ROSC (pin 33); if that fails or is omitted, it auto-switches to external crystal mode via XCK1/XCK2 (pins 34/33). Installing both resistor and crystal simultaneously is prohibited per TI design guidelines. The BQ20Z80DBT achieves ±1% frequency accuracy with the internal option and ±0.25% with crystal.
How does the BQ20Z80DBT handle battery safety protection?
The BQ20Z80DBT implements two-tier safety: primary protection (cell/pack OV/UV, 3× discharge OC, short-circuit, overtemperature) triggers internal FET control, while secondary protection (cell imbalance, AFE comm error, fuse-blow failure) asserts SAFE (pin 7, active-high) and SAFE (pin 12, active-low) to drive external fuses. These outputs are complementary and fail-safe-ensuring permanent disablement on critical faults. The BQ20Z80DBT logs all safety events in its lifetime data array for forensic analysis.
Can the BQ20Z80DBT operate without the bq29312A analog front-end?
No-the BQ20Z80DBT is explicitly designed to work with the bq29312A AFE. Its VIN, SCLK, SDATA, and CLKOUT pins interface directly to the bq29312A; cell voltage measurement, FET drive, and protection enforcement depend on this co-processor. TI documentation states "The bq20z80 features are only available with the bq29312A." Operating the BQ20Z80DBT standalone results in loss of cell monitoring, FET control, and primary safety functions-rendering it nonfunctional as a complete gas gauge solution.
What communication protocol does the BQ20Z80DBT use, and what commands are supported?
The BQ20Z80DBT uses SMBus v1.1 with Packet Error Checking (PEC) and supports all standard SBS commands (e.g., RemainingCapacity, Voltage, Current, BatteryStatus) plus extended commands including StateOfHealth (0x4f), SafetyAlert (0x50), PackVoltage (0x5a), and Authenticate (0x2f). It also implements manufacturer-specific registers for AFEData (0x45), FETControl (0x46), and DataFlash configuration. All commands are accessible via 7-bit slave address and comply with SBS 1.1 timing specifications (10–100 kHz).
BQ20Z80DBT 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 FAQ
1.How can I place an order for BQ20Z80DBT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ20Z80DBT 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 reliable?
The price and inventory of BQ20Z80DBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ20Z80DBT is usually 5 days.
3.What payment methods are accepted for BQ20Z80DBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ20Z80DBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ20Z80DBT?
BQ20Z80DBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ20Z80DBT 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?
For technical support, including BQ20Z80DBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ20Z80DBT requirements.
6.How does Aetrix verify that BQ20Z80DBT is sourced from the original manufacturer or authorized distributors?
All BQ20Z80DBT 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 meets industry standards.
7.What is the process for return or replacement of BQ20Z80DBT?
All BQ20Z80DBT units undergo pre-shipment inspection (PSI). If there is an issue with BQ20Z80DBT, 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 part is unused and in its original packaging.
Return procedure for BQ20Z80DBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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