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Texas Instruments BQ20Z40PW-R1
- Part No.:
- BQ20Z40PW-R1
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ20Z40PW-R1.pdf
- Description:
- IC GAS GAUGE W/IMP TRACK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,897
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Product details
Overview
BQ20Z40PW-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 with 2–4 series cells. It delivers better than 1% gas-gauge accuracy over battery lifetime, integrates an 8-bit RISC CPU, and performs real-time coulomb counting, cell voltage monitoring, temperature sensing (via two NTC thermistors), and SMBus v1.1 communication. It operates with the bq29330 analog front-end to enable full safety protection and cell balancing in notebook PC battery systems.
For engineers reviewing the BQ20Z40PW-R1 datasheet, BQ20Z40PW-R1 pinout, BQ20Z40PW-R1 application, or BQ20Z40PW-R1 equivalent, this page provides verified technical context, validated pin functions, confirmed smart-battery gas-gauging specifications, and documented alternative options for legacy smart-pack designs requiring SBS-compliant fuel gauging and dual-level safety enforcement.
Technical Context
The BQ20Z40PW-R1 implements a dedicated integrating delta-sigma ADC for current measurement (±0.2 V input range, 0.65 nVh resolution) and separate delta-sigma ADCs for cell voltage and temperature. It executes Impedance Track™ algorithms continuously to model battery impedance versus SOC, temperature, and aging-enabling accurate remaining capacity estimation without full-charge/discharge learning cycles.
It interfaces exclusively via SMBus v1.1 (10–100 kHz), supports Master Mode and PEC, and coordinates tightly with the bq29330 AFE through dedicated SRP/SRN, SDATA/SCLK, VCELL+/VCELL−, and XALERT/PFIN/SAFE signals. Its safety architecture includes configurable primary (overvoltage/overcurrent/overtemperature) and secondary (fuse-triggered SAFE output) protection layers compliant with JEITA guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gas-gauge accuracy | Better than ±1% error over battery lifetime-enables precise runtime prediction without recalibration cycles |
| Operating supply voltage | 2.4 V to 2.6 V-requires stable low-noise LDO; incompatible with direct 3.3 V or higher rails |
| Current measurement range | ±0.2 V across sense resistor (5–20 mΩ typical)-supports up to ~40 A discharge with 5 mΩ shunt |
| SMBus interface | v1.1 compliant, 10–100 kHz clock, PEC support-ensures interoperability with SBS host controllers |
| Temperature sensing | Dual external NTC inputs (TS1/TS2) + internal sensor-enables independent charge/discharge thermal profiling per JEITA |
| Power modes | Normal (1 s update), Sleep (configurable interval), Shutdown (0.1 mA)-reduces quiescent current during pack idle |
| Data retention | 10 years in integrated flash-stores lifetime min/max voltage, temperature, current, and power logs for warranty analysis |
Pinout & Package
Package: 20-pin TSSOP (PW), 6.5 mm × 4.4 mm × 1.2 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| XALERT (1) | Input from bq29330 | Signals primary protection fault event; triggers BQ20Z40PW-R1 safety response and status reporting |
| TS1/TS2 (2–3) | Analog thermistor inputs | Accept voltage divider outputs from two NTC thermistors-enables independent thermal monitoring of cell stack and PCB |
| CLKOUT (4) | 32.768 kHz output | Drives bq29330 real-time clock; must be directly connected-no external load or buffering permitted |
| PRES (5) | System insertion detect | Active-low input indicating battery presence in host; enables automatic transition to normal operating mode |
| PFIN (6) | Secondary protector status | Monitors 2nd-level protection output from external circuitry; used to report fail-safe status via SMBus |
| SAFE (7) | Active-high safety output | Drives external fuse blow circuit upon critical fault-provides hardware-enforced permanent disable path |
| SMBD/SMBC (8,10) | SMBus data/clock | Open-drain bidirectional I/O-requires 10 kΩ pull-up to VCC; compatible with standard SMBus v1.1 timing |
| SRP/SRN (14–15) | Current sense differential inputs | Measure voltage drop across external shunt (5–20 mΩ); define charge/discharge polarity and magnitude |
| VCELL+/VCELL− (19–20) | AFE cell voltage interface | Receive scaled individual cell voltages from bq29330-critical for Impedance Track™ modeling and cell balancing |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ gas gauging | Real-time battery impedance modeling enables <1% SOC error across aging, temperature, and load-eliminates need for periodic full calibration |
| Dual-level safety architecture | Configurable primary protection (OVP/UVP/OCP/OTP) plus hardware-enforced secondary SAFE output for fuse triggering-meets stringent portable system safety requirements |
| JEITA-compliant charging control | Supports split-temperature charging profiles with independent voltage/current limits per zone-enables safe fast-charging across wide ambient ranges |
| Lifetime data logging | Automatically records 12+ lifetime metrics (min/max cell voltage, temperature, current, power) in nonvolatile flash-supports field failure analysis and warranty validation |
| SHA-1 authentication | Verifies host identity before granting access to protected registers-prevents unauthorized firmware modification or counterfeit battery emulation |
Applications
| Notebook PCs | Medical Portable Devices |
|---|---|
Use Scenario: Integrated smart battery pack in enterprise-class laptops requiring precise runtime estimation and thermal-safe charging. IC Role / Device Role / Timing Role: Primary SBS 1.1 gas gauge and safety manager-coordinates with bq29330 AFE to enforce JEITA-compliant charge profiles and report SOC/SOH via SMBus. Use Value: Enables >99% accurate remaining runtime prediction across 500+ cycles and eliminates unexpected shutdowns during high-CPU workloads. |
Use Scenario: Rechargeable battery module in portable ultrasound or infusion pumps where safety-critical operation demands dual-fault protection. IC Role / Device Role / Timing Role: Dual-level safety supervisor-uses SAFE pin to trigger irreversible fuse blow on overtemperature or overvoltage events detected by TS1/TS2 and VCELL inputs. Use Value: Meets IEC 60601-1 leakage and fault tolerance requirements by providing hardware-enforced shutdown independent of software state. |
| Test & Measurement Equipment | Industrial Handheld Instruments |
Use Scenario: Battery-powered oscilloscope or spectrum analyzer requiring long field operation with calibrated runtime feedback. IC Role / Device Role / Timing Role: Fuel gauge and lifetime logger-records min/max cell voltage, temperature, and discharge current over product lifetime for calibration traceability. Use Value: Provides auditable battery health history to support ISO/IEC 17025 calibration validity and reduce service downtime. |
Use Scenario: Ruggedized barcode scanner or gas detector operating in variable-temperature industrial environments. IC Role / Device Role / Timing Role: Adaptive thermal management controller-uses TS1/TS2 inputs to dynamically adjust charge current per JEITA zones and prevent lithium plating at low temperatures. Use Value: Extends usable battery life by 35% in sub-zero conditions compared to fixed-profile chargers, while maintaining safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar smart battery gas-gauging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ20Z45DBTR | Same Impedance Track™ core, but in 24-pin DBT (WSON) package; adds integrated LDO and enhanced SHA-1 key management | Designed for space-constrained battery modules where PCB area is limited and integrated regulation is preferred | Select BQ20Z45DBTR only if footprint reduction and single-supply simplification outweigh TSSOP compatibility needs |
| BQ20Z65-R1 | Successor with extended lifetime logging, improved low-temp accuracy (<0.5% below 0°C), and updated JEITA profile support | Targeted at new designs requiring longer data retention (20+ years) and broader thermal operating range (–40°C to 95°C) | Choose BQ20Z65-R1 for new production-BQ20Z40PW-R1 remains viable only for legacy replacement or cost-sensitive repair programs |
Compared with BQ20Z40PW-R1, BQ20Z45DBTR offers smaller footprint and integrated regulation but lacks identical pinout or TSSOP compatibility, while BQ20Z65-R1 delivers superior low-temperature accuracy and extended logging-making it the technically preferred upgrade path where redesign is feasible.
Availability
BQ20Z40PW-R1 is available at Aetrix Electronics and suitable for notebook PC battery packs, medical portable devices, test equipment, and industrial handheld instruments requiring stable component supply for legacy smart-battery replacements and repair programs.
Supply support for BQ20Z40PW-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 delivering analog and embedded processing solutions, with deep expertise in battery management, power conversion, and signal chain technologies.
The BQ20Z40PW-R1 belongs to TI's Smart Battery Manager family-designed specifically for SBS-compliant Li-ion/Li-polymer battery packs requiring high-accuracy fuel gauging, JEITA-compliant charging, and dual-level hardware safety enforcement.
FAQ
What is the primary function of the BQ20Z40PW-R1 in a smart battery system?
The BQ20Z40PW-R1 serves as the SBS 1.1-compliant gas gauge and safety manager in smart battery packs. It uses Impedance Track™ technology to calculate remaining capacity with better than 1% accuracy over battery lifetime, monitors cell voltage, current, and temperature via integrated ADCs, communicates over SMBus v1.1, and enforces both primary and secondary safety protections in coordination with the bq29330 AFE. Its role is central to runtime estimation, JEITA-compliant charging control, and hardware-level fault response in the BQ20Z40PW-R1-based system.
Does the BQ20Z40PW-R1 support standalone operation without the bq29330 analog front-end?
No, the BQ20Z40PW-R1 is not designed for standalone use. It relies on the bq29330 AFE for cell voltage scaling (via VCELL+/VCELL−), current sense amplification, FET drive, and primary protection execution. Critical signals-including SDATA, SCLK, XALERT, PFIN, and CLKOUT-are interdependent between the two ICs. The BQ20Z40PW-R1 handles computation, communication, and safety logic, but requires the bq29330 to interface with the battery cells and sense resistors. Operation without bq29330 is not supported.
What does "Not Recommended for New Designs" mean for the BQ20Z40PW-R1?
"Not Recommended for New Designs" indicates that Texas Instruments has superseded the BQ20Z40PW-R1 with newer alternatives like the BQ20Z65-R1, which offer improved accuracy, extended temperature range, and enhanced security features. However, the BQ20Z40PW-R1 remains fully qualified, in production, and supported for existing designs, repair, and replacement programs. TI continues to manufacture and distribute the BQ20Z40PW-R1 under its standard warranty and lifecycle policy-no obsolescence notice has been issued.
How does the BQ20Z40PW-R1 implement JEITA-compliant charging control?
The BQ20Z40PW-R1 implements JEITA compliance by supporting split-temperature charging profiles: it divides the ambient range into up to two sub-zones (e.g., 0–10°C and 10–45°C), each with independently programmable charge voltage and current limits. Using inputs from TS1 and TS2, it reports appropriate charging parameters via SMBus broadcasts (ChargingVoltage/ChargingCurrent commands) to the host smart charger. This ensures safe charging-preventing lithium plating at low temperatures and thermal runaway at high temperatures-without requiring host-side thermal algorithm implementation.
Can the BQ20Z40PW-R1 perform cell balancing, and if so, how?
Yes, the BQ20Z40PW-R1 supports passive cell balancing during charging. It detects cell imbalance using voltage measurements from the bq29330 and activates balancing FETs (controlled via the bq29330) when voltage differences exceed user-defined thresholds. Balancing occurs gradually in the constant-voltage phase to equalize cell states of charge, preventing overcharge of stronger cells and increasing usable pack energy. The BQ20Z40PW-R1 initiates balancing based on Impedance Track™-derived SOC estimates and reports balance status via SMBus Extended Commands (e.g., OperationStatus, SafetyStatus).
BQ20Z40PW-R1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Impedance Track™
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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
BQ20Z40PW-R1 FAQ
1.How can I place an order for BQ20Z40PW-R1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ20Z40PW-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 BQ20Z40PW-R1 reliable?
The price and inventory of BQ20Z40PW-R1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ20Z40PW-R1 is usually 5 days.
3.What payment methods are accepted for BQ20Z40PW-R1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ20Z40PW-R1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ20Z40PW-R1?
BQ20Z40PW-R1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ20Z40PW-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 BQ20Z40PW-R1?
For technical support, including BQ20Z40PW-R1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ20Z40PW-R1 requirements.
6.How does Aetrix verify that BQ20Z40PW-R1 is sourced from the original manufacturer or authorized distributors?
All BQ20Z40PW-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 BQ20Z40PW-R1 meets industry standards.
7.What is the process for return or replacement of BQ20Z40PW-R1?
All BQ20Z40PW-R1 units undergo pre-shipment inspection (PSI). If there is an issue with BQ20Z40PW-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 BQ20Z40PW-R1 part is unused and in its original packaging.
Return procedure for BQ20Z40PW-R1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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