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Texas Instruments BQ20Z70PW-V110G4
- Part No.:
- BQ20Z70PW-V110G4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ20Z70PW-V110G4.pdf
- Description:
- IC GAS GAUGE FOR BQ29330 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,603
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Product details
Overview
BQ20Z70PW-V110G4 from Texas Instruments is a Smart Battery System (SBS) v1.1–compliant gas gauge IC with Impedance Track™ technology, designed for Li-ion/Li-polymer battery packs. It delivers better than 1% gas-gauge accuracy over battery lifetime, supports 2–4 series cells, integrates dual 16-bit delta-sigma ADCs for voltage/current/temperature sensing, and works with the bq29330 analog front-end to provide full pack protection and cell balancing in notebook PCs and portable medical instrumentation.
For engineers reviewing the BQ20Z70PW-V110G4 datasheet, BQ20Z70PW-V110G4 pinout, BQ20Z70PW-V110G4 application, or BQ20Z70PW-V110G4 equivalent, key selection considerations include SMBus v1.1 compliance, SHA-1 authentication support, integrated 32.768 kHz oscillator, self-calibrating coulomb counter (0.65 nVh resolution), and programmable safety thresholds for voltage, current, and temperature across primary and secondary protection levels.
Technical Context
The BQ20Z70PW-V110G4 implements a dedicated 8-bit RISC CPU with ultra-low-power sleep/shutdown modes and performs real-time battery modeling using Impedance Track™-continuously analyzing cell impedance, open-circuit voltage, and temperature to compute remaining capacity without learning cycles. It interfaces exclusively via SMBus v1.1 (with PEC), communicates bidirectionally with the bq29330 AFE through SDATA/SCLK, and drives external safety circuitry via the SAFE pin for fuse blow control.
Its analog subsystem includes two independent delta-sigma ADCs: one for high-precision coulomb counting (±0.2 V input range, 10 µV offset, ±0.037% INL) and another for cell voltage (via bq29330 multiplexer), thermistor inputs (TS1/TS2), and internal temperature sensing. All measurements feed into firmware-executed gas-gauging and protection algorithms stored in integrated field-programmable FLASH memory.
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 |
| Coulomb Counter Resolution | 0.65 nVh - supports sub-mAh charge/discharge tracking accuracy at typical sense resistor values (5–20 mΩ) |
| Operating Voltage Range | 2.4 V to 2.6 V - tightly regulated supply requirement ensures stable ADC and CPU operation |
| SMBus Compliance | SBS v1.1 with PEC - guarantees interoperability with host systems implementing Smart Battery Data Specification |
| Protection Levels | Primary + secondary safety layers - provides redundant overvoltage/overcurrent/overtemperature detection with SAFE pin-driven fail-safe action |
| FLASH Memory | Field-programmable, 20,000 write cycles, 10-year data retention - stores configuration, calibration, and safety thresholds without external EEPROM |
| Oscillators | Integrated 4.194 MHz high-frequency and 32.768 kHz low-frequency oscillators - eliminates need for external crystals or timing components |
Pinout & Package
Package: 20-pin TSSOP (PW), 0.65 mm pitch, body size 6.5 mm × 4.4 mm, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| XALERT (1) | Interrupt input | Accepts active-low alert signal from bq29330 to trigger immediate fault processing |
| TS1 / TS2 (2–3) | Analog thermistor inputs | Monitor battery pack temperature using NTC thermistors (e.g., Semitec 103AT); support dual-point thermal profiling |
| CLKOUT (4) | 32.768 kHz clock output | Drives bq29330 watchdog timer (WDI pin); enables synchronized safety monitoring |
| PRES (5) | System presence detection | Monitors PU pin pull-down to detect host system insertion; used for wake-up and state initialization |
| PFIN (6) | Secondary protector status input | Reads fault status from external secondary protector to enable cascaded safety response |
| SAFE (7) | Fail-safe output | Active-high signal to blow inline fuse during critical faults (e.g., safety overvoltage, FET failure) |
| SMBD / SMBC (8,10) | SMBus bidirectional data/clock | Open-drain interface compliant with SMBus v1.1 timing (10–100 kHz); supports PEC and broadcast commands |
| SDATA / SCLK (11–12) | AFE communication interface | Direct serial link to bq29330 for cell voltage acquisition, cell balancing control, and AFE register access |
| SRP / SRN (14–15) | Coulomb counter differential inputs | Measure voltage drop across 5–20 mΩ sense resistor to compute charge flow with auto-calibration |
| MRST (16) | Master reset input | Forces hardware reset when pulled low; connected directly to XRST pin of bq29330 for coordinated startup |
| VCELL+ / VCELL− (19–20) | Differential cell voltage inputs | Receive conditioned cell voltage signals from bq29330 CELL+ and CELL− pins for impedance modeling |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ gas gauging | Enables instant accuracy (<1% error) without full-charge/discharge learning cycles - reduces time-to-deployment and improves user runtime estimates |
| Integrated dual delta-sigma ADCs | One ADC for ±0.2 V coulomb counting (10 µV offset), another for cell voltage/temperature - eliminates external signal conditioning and reduces BOM count |
| Programmable dual-level safety | Configurable first-tier (e.g., 4.3 V COV) and second-tier (e.g., 18 V SOV) protection thresholds - supports fail-safe shutdown before catastrophic failure |
| SHA-1 authentication | Verifies host identity during SMBus transactions - prevents unauthorized charger or host interaction with battery pack |
| Cell balancing algorithm | Gradually equalizes cell voltages during charging using bq29330 drive outputs - extends pack cycle life and usable energy by preventing premature termination |
| Ultra-low-power sleep mode | 8 µA typical current (with bq29330) - enables months of shelf-life monitoring while maintaining accurate state-of-charge |
Applications
| Notebook PC Battery Packs | Portable Medical Devices |
|---|---|
Use Scenario: Integrated into removable Li-ion battery packs for business-class laptops requiring precise runtime estimation and OEM-level safety certification. IC Role / Device Role / Timing Role: Primary SBS-compliant gas gauge and safety manager; coordinates with bq29330 AFE to enforce JEITA-compliant charge profiles and thermal limits. Use Value: Delivers <1% remaining capacity error across 500+ cycles and supports Windows ACPI battery reporting via SMBus v1.1 - enabling accurate OS-level power management. |
Use Scenario: Used in battery-powered infusion pumps and portable ECG monitors where regulatory compliance (IEC 60601-1) mandates redundant safety layers. IC Role / Device Role / Timing Role: Dual-level protector and authenticated fuel gauge; triggers SAFE pin to disable power delivery on critical overtemperature or cell imbalance events. Use Value: Meets Class BF isolation requirements via galvanically isolated SMBus interface and provides audit-ready SHA-1 logs for device authentication traceability. |
| Test & Measurement Equipment | Industrial Portable Instrumentation |
Use Scenario: Embedded in rechargeable battery modules for handheld oscilloscopes and multimeters needing long-term calibration stability and low self-discharge. IC Role / Device Role / Timing Role: Gas gauge with auto-calibrating coulomb counter and integrated 32.768 kHz oscillator - replaces external RTC and sense-resistor amplifiers. Use Value: Maintains ±0.65 nVh integration accuracy over –40°C to 85°C, enabling <2% runtime error even after 12-month storage at elevated temperatures. |
Use Scenario: Deployed in explosion-proof gas detectors and handheld analyzers operating in remote field environments with wide temperature swings. IC Role / Device Role / Timing Role: Low-power battery monitor with dual thermistor inputs (TS1/TS2) and shutdown mode (0.2 µA with bq29330) - extends operational uptime between charges. Use Value: Supports configurable charge inhibit windows (e.g., –20°C to 60°C) and reports absolute state-of-charge via SMBus - critical for hazardous-area safety protocols. |
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 |
|---|---|---|---|
| BQ20Z75-V110 | Same Impedance Track™ core but adds integrated 5-V LDO regulator and enhanced SHA-1 key management; requires no external VDD regulation | Preferred for new designs where board space is constrained and single-supply simplification is prioritized | Select BQ20Z75-V110 if eliminating external LDO and supporting advanced cryptographic key provisioning are required |
| BQ20Z65-V110 | Lacks SHA-1 authentication and secondary safety features; reduced FLASH memory (8 KB vs. 16 KB); no SAFE pin output | Suitable only for cost-sensitive consumer applications without security or fail-safe requirements | Choose BQ20Z65-V110 only for non-critical applications where authentication and dual-level protection are unnecessary |
Compared with BQ20Z75-V110 and BQ20Z65-V110, the BQ20Z70PW-V110G4 uniquely balances full SBS v1.1 compliance, SHA-1 security, and dual-level safety in a minimal 20-pin TSSOP footprint - making it optimal for industrial and medical battery packs requiring certified reliability without added regulators or reduced feature sets.
Availability
BQ20Z70PW-V110G4 is available at Aetrix Electronics and suitable for notebook PC battery packs, portable medical devices, test equipment, and industrial portable instrumentation requiring stable component supply, long-lifecycle support, and guaranteed SBS v1.1 interoperability.
Supply support for BQ20Z70PW-V110G4 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 BQ20Z70PW-V110G4 belongs to TI's Smart Battery Fuel Gauge product line, engineered specifically for high-accuracy, safety-certifiable Li-ion/Li-polymer battery pack monitoring in mission-critical portable systems.
FAQ
What is the primary function of the BQ20Z70PW-V110G4 in a battery pack?
The BQ20Z70PW-V110G4 serves as the central Smart Battery System (SBS) v1.1–compliant gas gauge and safety manager. It measures and models battery state using Impedance Track™ technology, reports remaining capacity and runtime via SMBus, enforces programmable voltage/current/temperature protections, and coordinates with the bq29330 analog front-end to execute cell balancing and fail-safe actions. Its role is foundational to achieving <1% gas-gauge accuracy and dual-level safety compliance in certified battery packs.
Does the BQ20Z70PW-V110G4 require an external crystal or oscillator?
No, the BQ20Z70PW-V110G4 integrates both a 4.194 MHz high-frequency oscillator and a 32.768 kHz low-frequency oscillator on-die. These eliminate the need for external crystals or resonators, reducing bill-of-materials cost and PCB area. The 32.768 kHz output (CLKOUT pin) is specifically routed to the bq29330 watchdog input, ensuring synchronized safety timing without external components.
How does the BQ20Z70PW-V110G4 achieve better than 1% gas-gauge accuracy without learning cycles?
The BQ20Z70PW-V110G4 achieves this using Impedance Track™ technology - a proprietary algorithm that continuously models battery impedance, open-circuit voltage, temperature, and load history in real time. Unlike coulomb-counting-only gauges, it dynamically adjusts capacity estimates based on aging, discharge rate, and temperature effects. This eliminates the need for full-charge/discharge learning cycles while maintaining <1% error across the battery's lifetime, as validated in TI's SLUS742 datasheet.
Can the BQ20Z70PW-V110G4 operate independently of the bq29330 analog front-end?
No - the BQ20Z70PW-V110G4 is architecturally designed to work in tandem with the bq29330. It relies on the bq29330 for cell voltage multiplexing (via VCELL+/VCELL−), FET drive control, cell balancing, and primary protection execution. While the BQ20Z70PW-V110G4 hosts the gas-gauge CPU and SMBus interface, its analog measurement capability is limited to thermistors (TS1/TS2), current sense (SRP/SRN), and communication lines (SDATA/SCLK). Full functionality requires the bq29330 co-processor.
What safety features does the BQ20Z70PW-V110G4 provide beyond basic overvoltage and overcurrent protection?
Beyond first-tier protections (e.g., cell overvoltage, charge/discharge overcurrent), the BQ20Z70PW-V110G4 implements second-level safety features including safety overvoltage (SOV), safety overcurrent (SOC), safety overtemperature (SOT), and AFE communication fault detection. These trigger the SAFE pin (Pin 7) to initiate irreversible actions like fuse blow. Configuration values for all safety thresholds - including time delays and recovery conditions - are stored in the device's integrated FLASH memory and can be customized per application requirements.
BQ20Z70PW-V110G4 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:
- Obsolete
- 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:
- SMBus
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
BQ20Z70PW-V110G4 FAQ
1.How can I place an order for BQ20Z70PW-V110G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ20Z70PW-V110G4 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 BQ20Z70PW-V110G4 reliable?
The price and inventory of BQ20Z70PW-V110G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ20Z70PW-V110G4 is usually 5 days.
3.What payment methods are accepted for BQ20Z70PW-V110G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ20Z70PW-V110G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ20Z70PW-V110G4?
BQ20Z70PW-V110G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ20Z70PW-V110G4 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 BQ20Z70PW-V110G4?
For technical support, including BQ20Z70PW-V110G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ20Z70PW-V110G4 requirements.
6.How does Aetrix verify that BQ20Z70PW-V110G4 is sourced from the original manufacturer or authorized distributors?
All BQ20Z70PW-V110G4 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 BQ20Z70PW-V110G4 meets industry standards.
7.What is the process for return or replacement of BQ20Z70PW-V110G4?
All BQ20Z70PW-V110G4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ20Z70PW-V110G4, 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 BQ20Z70PW-V110G4 part is unused and in its original packaging.
Return procedure for BQ20Z70PW-V110G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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