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Texas Instruments BQ20Z40PWR-R1
- Part No.:
- BQ20Z40PWR-R1
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ20Z40PWR-R1.pdf
- Description:
- IC GAS GAUGE LI-ION 2-4C 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,126
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Product details
Overview
BQ20Z40PWR-R1 from Texas Instruments is an SBS 1.1-compliant gas gauge IC with Impedance Track™ technology, designed for Li-ion/Li-polymer battery packs in notebook PCs and portable medical instrumentation. It integrates an 8-bit RISC CPU, dual delta-sigma ADCs (for current and voltage/temperature), SMBus v1.1 interface, SHA-1 authentication, and programmable protection logic. It operates with the bq29330 AFE and delivers <1% gas-gauge error over battery lifetime.
For engineers reviewing the BQ20Z40PWR-R1 datasheet, BQ20Z40PWR-R1 pinout, BQ20Z40PWR-R1 application, or BQ20Z40PWR-R1 equivalent, key selection criteria include Impedance Track™ accuracy, dual thermistor support (TS1/TS2), 20-pin TSSOP (PW) package compatibility, SMBus communication with PEC, and integrated safety features including primary/secondary overvoltage/overcurrent/overtemperature protection.
Technical Context
The BQ20Z40PWR-R1 implements a closed-loop gas-gauging architecture where the integrated 8-bit RISC CPU continuously executes the Impedance Track™ algorithm using real-time measurements from its integrating delta-sigma coulomb counter (SRP/SRN) and dual-input delta-sigma ADCs (VCELL±, TS1, TS2). It relies on external bq29330 for cell balancing, FET control, and analog front-end functions.
It supports three power modes-Normal (1-s update interval), Sleep (programmable interval with wake-on-current), and Shutdown-with operating current as low as 0.1 µA. Communication occurs exclusively via SMBus v1.1 with Master Mode and Package Error Checking (PEC), and it complies fully with Smart Battery Specification v1.1 for host interoperability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gas-gauge accuracy | Better than ±1% error over battery lifetime-enables precise remaining capacity reporting without full-charge/discharge learning cycles. |
| Supply voltage | 2.4 V to 2.6 V-tight regulation required; absolute max –0.3 V to 2.75 V relative to VSS. |
| Operating temperature | –40°C to +85°C-supports industrial and portable computing environments with extended thermal range. |
| Current measurement | Integrating delta-sigma ADC with ±0.2 V input range across SRP/SRN-supports 5 mΩ to 20 mΩ sense resistors for charge/discharge monitoring. |
| SMBus interface | v1.1 compliant with PEC, 10–100 kHz clock, open-drain SMBC/SMBD-ensures robust host communication in noisy battery-pack environments. |
| Protection features | Configurable primary (cell OV/UV, OC, OT) and secondary (SAFE pin-triggered fuse blow) safety layers-meets JEITA guidelines and enables fail-safe battery management. |
| Authentication | SHA-1 challenge-response protocol-prevents counterfeit battery pack integration in OEM systems. |
| Memory | Integrated data flash with 10-year retention and 20,000 write cycles-stores lifetime logging data (min/max voltage, temperature, current, power). |
Pinout & Package
Package: 20-pin TSSOP (PW), 0.65 mm pitch, body size 6.5 mm × 4.4 mm, exposed pad not present. Thermal resistance θJA = 89.5°C/W (JEDEC high-K board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 XALERT | Input from bq29330 | Signals fault condition from AFE; triggers internal safety response and status reporting. |
| 2 TS2 / 3 TS1 | Analog thermistor inputs | Support two independent NTC thermistors (e.g., Semitec 103AT) for differential thermal monitoring of battery cells. |
| 4 CLKOUT | Output | 32.768 kHz clock output directly connected to bq29330 AFE-synchronizes timing-critical protection functions. |
| 5 PRES / 6 PFIN | Digital inputs | PRES detects system insertion; PFIN reads secondary protector status-enables dynamic mode switching and fault escalation. |
| 7 SAFE | Active-high output | Drives external fuse or latch to permanently disable pack during critical faults (e.g., safety OV/OC/OT). |
| 8 SMBD / 10 SMBC | SMBus bidirectional I/O | Open-drain data/clock lines compliant with SMBus v1.1-enable host read/write of SBS registers and extended commands. |
| 11 SDATA / 12 SCLK | Interface to bq29330 | Serial communication bus between gas gauge and AFE-transfers cell voltage, balance status, and protection decisions. |
| 14 SRP / 15 SRN | Current-sense analog inputs | Accept bipolar differential voltage (±0.2 V) across sense resistor-feed coulomb counter for precise charge/discharge tracking. |
| 19 VCELL+ / 20 VCELL− | Analog inputs from bq29330 | Receive scaled individual cell voltage readings-used for impedance calculation and state-of-charge estimation. |
| 17 VSS / 18 VCC | Power supply | Ground and regulated 2.4–2.6 V supply-requires local decoupling; VCC must exceed 1.7 V for POR activation. |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ algorithm | Real-time modeling of battery impedance vs. SOC, temperature, aging, and discharge rate-delivers <1% gas-gauge error without periodic recalibration. |
| Two-level safety architecture | Primary protection (OV/UV/OC/OT) plus secondary SAFE pin assertion for irreversible shutdown-meets stringent portable electronics safety requirements. |
| JEITA-compliant charging control | Supports split-temperature-range charging profiles with independent voltage/current limits per zone-enables safe fast-charging across wide ambient conditions. |
| Lifetime data logging | Nonvolatile storage of 12+ lifetime metrics (e.g., min/max cell voltage, avg discharge current, max temp)-supports warranty analysis and field failure root-cause investigation. |
| SHA-1 authentication | Secure challenge-response handshake with host system-prevents unauthorized or cloned battery packs from operating in certified devices. |
| Flexible power management | Three operational modes (Normal/Sleep/Shutdown) with wake-on-current capability-reduces average current to ≤8 µA in sleep mode for long-term storage. |
Applications
| Notebook PC Battery Management | Portable Medical Instrumentation |
|---|---|
Use Scenario: Integrated into removable smart battery packs for ultrabooks and business-class laptops requiring accurate runtime prediction and safety compliance. IC Role / Device Role / Timing Role: Primary SBS 1.1 gas gauge and safety controller; coordinates with bq29330 AFE to manage cell balancing, FET control, and JEITA charging. Use Value: Enables <1% remaining capacity accuracy across 500+ cycles and supports Windows ACPI battery reporting via SMBus. | Use Scenario: Embedded in sealed battery modules for portable ECG monitors, infusion pumps, and handheld diagnostic tools operating in clinical environments. IC Role / Device Role / Timing Role: Gas gauge and dual-thermistor safety monitor; provides lifetime logging of max/min cell voltage and temperature for regulatory traceability. Use Value: Meets IEC 62366 usability and IEC 60601-1 safety requirements through configurable overtemperature thresholds and SHA-1 authentication. |
| Test & Measurement Equipment | Industrial Portable Instrumentation |
Use Scenario: Used in battery-powered oscilloscopes, multimeters, and spectrum analyzers requiring stable runtime under variable load and temperature. IC Role / Device Role / Timing Role: Real-time coulomb counter and cell voltage supervisor; interfaces with host MCU via SMBus to report AtRateTimeToEmpty and StateOfHealth. Use Value: Delivers consistent runtime estimates despite fluctuating discharge currents (e.g., during signal acquisition bursts) due to Impedance Track™ dynamic compensation. | Use Scenario: Deployed in handheld gas detectors, environmental sensors, and ruggedized field testers operating in harsh industrial settings (-20°C to +60°C). IC Role / Device Role / Timing Role: Dual-NTC thermal manager and safety enforcer; uses TS1/TS2 inputs to trigger charge inhibit when ambient exceeds preset thresholds. Use Value: Prevents lithium battery thermal runaway by enforcing JEITA-compliant charging suspension above 45°C and below 0°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ20Z45DBTR-R1 | Same Impedance Track™ core but in 32-pin QFN (RSM); adds integrated LDO and enhanced EEPROM endurance. | Preferred for new designs requiring lower thermal resistance (θJA = 37.4°C/W) and PCB space optimization over TSSOP. | Select BQ20Z45DBTR-R1 if layout allows QFN and higher integration (integrated LDO) is desired; not pin-compatible with BQ20Z40PWR-R1. |
| BQ20Z65-R1 | Successor with extended SBS command set, improved SHA-1 implementation, and support for 5-series Li-ion configurations. | Targets next-gen notebooks and tablets needing higher cell count support and updated security protocols. | Choose BQ20Z65-R1 for new designs requiring >4-cell support or enhanced cryptographic authentication; requires firmware and layout updates. |
Compared with BQ20Z40PWR-R1, BQ20Z45DBTR-R1 offers superior thermal performance and integrated power regulation but requires QFN rework, while BQ20Z65-R1 extends functionality for multi-cell and security-critical applications at the cost of design migration effort.
Availability
BQ20Z40PWR-R1 is available at Aetrix Electronics and suitable for notebook PC battery packs, portable medical instrumentation, and industrial test equipment requiring stable component supply and legacy SBS 1.1 interoperability.
Supply support for BQ20Z40PWR-R1 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 BQ20Z40PWR-R1 belongs to TI's Smart Battery Fuel Gauge product line, engineered specifically for high-accuracy, safety-critical Li-ion/Li-polymer battery monitoring in portable computing and medical devices.
FAQ
What is the primary function of the BQ20Z40PWR-R1 in a battery management system?
The BQ20Z40PWR-R1 serves as an SBS 1.1-compliant gas gauge and safety controller that accurately measures remaining capacity using Impedance Track™ technology while managing primary and secondary protection functions. It works in tandem with the bq29330 AFE to provide cell voltage monitoring, current sensing, thermal management, and SMBus communication. Its role is central to runtime prediction, safety enforcement, and host-system battery status reporting in the BQ20Z40PWR-R1-based battery pack.
Does the BQ20Z40PWR-R1 support standalone operation without the bq29330 AFE?
No, the BQ20Z40PWR-R1 does not operate standalone. It requires the bq29330 analog front-end IC for cell voltage multiplexing, FET gate driving, cell balancing, and overvoltage/overcurrent protection execution. The BQ20Z40PWR-R1 handles computation, communication, and decision logic, while the bq29330 performs analog signal conditioning and power-path control. Their interface uses dedicated SDATA/SCLK pins, and CLKOUT from the BQ20Z40PWR-R1 synchronizes the AFE.
What are the key thermal characteristics of the BQ20Z40PWR-R1 in its TSSOP (PW) package?
The BQ20Z40PWR-R1 in 20-pin TSSOP (PW) has a junction-to-ambient thermal resistance (θJA) of 89.5°C/W under JEDEC high-K board conditions, junction-to-board (θJB) of 41.0°C/W, and junction-to-case (top) (θJC) of 23.4°C/W. These values indicate moderate self-heating under continuous operation and emphasize the need for adequate PCB copper area and airflow in compact battery pack designs. The device is rated for –40°C to +85°C operation, and thermal derating is not specified beyond absolute maximum ratings.
How does the BQ20Z40PWR-R1 implement SHA-1 authentication, and what is its purpose?
The BQ20Z40PWR-R1 implements SHA-1 authentication via the SMBus Authenticate command (0x2F) using stored secret keys (AuthenKey0–3) in protected flash memory. During host interrogation, it performs challenge-response hashing to verify battery authenticity. This prevents counterfeit or non-OEM battery packs from powering certified devices-critical for safety, warranty enforcement, and system integrity in premium notebooks and medical equipment using the BQ20Z40PWR-R1.
Is the BQ20Z40PWR-R1 recommended for new designs, and what are the implications?
No-the BQ20Z40PWR-R1 is marked "Not Recommended for New Designs" in its official TI documentation. While fully functional and supported, TI recommends migrating to successors like BQ20Z45DBTR-R1 (QFN variant) or BQ20Z65-R1 (enhanced feature set) for new projects. This designation reflects obsolescence planning rather than immediate discontinuation; existing designs may continue using BQ20Z40PWR-R1 with full datasheet and technical support, but long-term supply assurance favors newer alternatives.
BQ20Z40PWR-R1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Impedance Track™
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 2 ~ 4
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage, Short Circuit
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
BQ20Z40PWR-R1 FAQ
1.How can I place an order for BQ20Z40PWR-R1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ20Z40PWR-R1 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 BQ20Z40PWR-R1 reliable?
The price and inventory of BQ20Z40PWR-R1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ20Z40PWR-R1 is usually 5 days.
3.What payment methods are accepted for BQ20Z40PWR-R1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ20Z40PWR-R1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ20Z40PWR-R1?
BQ20Z40PWR-R1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ20Z40PWR-R1 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 BQ20Z40PWR-R1?
For technical support, including BQ20Z40PWR-R1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ20Z40PWR-R1 requirements.
6.How does Aetrix verify that BQ20Z40PWR-R1 is sourced from the original manufacturer or authorized distributors?
All BQ20Z40PWR-R1 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 BQ20Z40PWR-R1 meets industry standards.
7.What is the process for return or replacement of BQ20Z40PWR-R1?
All BQ20Z40PWR-R1 units undergo pre-shipment inspection (PSI). If there is an issue with BQ20Z40PWR-R1, 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 BQ20Z40PWR-R1 part is unused and in its original packaging.
Return procedure for BQ20Z40PWR-R1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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