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Texas Instruments BQ20Z70PW-V110
- Part No.:
- BQ20Z70PW-V110
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ20Z70PW-V110.pdf
- Description:
- IC BATT MON LI-ION 2-4CL 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,783
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Product details
Overview
BQ20Z70PW-V110 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 in notebook PCs and portable medical instrumentation. It delivers better than 1% gas-gauge accuracy over battery lifetime, supports 2–4 series cell configurations, integrates dual 16-bit delta-sigma ADCs for voltage/current/temperature sensing, and operates from –40°C to 85°C in a 20-pin TSSOP package.
For engineers reviewing the BQ20Z70PW-V110 datasheet, BQ20Z70PW-V110 pinout, BQ20Z70PW-V110 application, or BQ20Z70PW-V110 equivalent, key selection considerations include SMBus v1.1 compliance, integrated SHA-1 authentication, coulomb counting resolution of 0.65 nVh, self-calibrating current sensing via SRP/SRN, and co-design compatibility with the bq29330 analog front-end IC.
Technical Context
The BQ20Z70PW-V110 implements a dedicated 8-bit RISC CPU with ultra-low-power modes and performs real-time battery modeling using Impedance Track™-a patented algorithm that continuously analyzes cell impedance, open-circuit voltage, temperature, and aging effects to compute remaining capacity without learning cycles. It interfaces exclusively with the bq29330 AFE via SDATA/SCLK and drives safety-critical outputs like SAFE (pin 7) for fuse blow control.
Its measurement architecture includes two independent delta-sigma ADCs: one for high-precision coulomb counting (±0.2 V input range, 10 µV offset max) and another for cell voltage, thermistor, and pack voltage monitoring. The device supports configurable primary and secondary protection thresholds stored in field-programmable flash memory and communicates over SMBus with PEC error checking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gas Gauging Accuracy | Better than 1% error over battery lifetime-enables precise state-of-charge reporting without full-charge/discharge calibration cycles. |
| Coulomb Counter Resolution | 0.65 nVh-supports accurate charge/discharge integration across wide current ranges using 5–20 mΩ sense resistors. |
| Operating Temperature | –40°C to +85°C-validates use in industrial portable equipment and medical devices requiring extended thermal margins. |
| SMBus Compliance | SBS v1.1 with PEC-ensures interoperability with host systems implementing Smart Battery Data Specification for runtime estimation and fault reporting. |
| Power Modes | Normal (1 s update interval), Sleep (configurable interval), Shutdown (0.2 µA)-reduces quiescent current during idle states to extend pack standby life. |
| Authentication | SHA-1 support-provides cryptographic verification of battery authenticity to prevent counterfeit pack insertion. |
| Flash Memory | Integrated field-programmable FLASH-stores configuration data, protection thresholds, and calibration parameters without external EEPROM. |
Pinout & Package
Package: 20-pin TSSOP (PW), 0.65 mm pitch, 6.5 mm × 4.4 mm footprint, exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (XALERT) | Alert interrupt input | Direct connection to bq29330 XALERT pin-signals primary protection events (e.g., overvoltage, overtemperature) to trigger immediate host response. |
| 4 (CLKOUT) | 32.768 kHz oscillator output | Drives bq29330 WDI pin-provides watchdog timing reference to ensure AFE remains functional and responsive. |
| 7 (SAFE) | Active-high safety enforcement output | Triggers permanent disablement (e.g., fuse blow) upon secondary-level faults-adds hardware-level fail-safe beyond software-managed protections. |
| 14 (SRP) / 15 (SRN) | Differential current sense inputs | Accepts voltage drop across 5–20 mΩ shunt resistor-enables bidirectional coulomb counting with auto-calibration to cancel offset errors. |
| 19 (VCELL+) / 20 (VCELL–) | Differential cell voltage input | Connects directly to bq29330 CELL+ and CELL– pins-acquires per-cell voltage data required for Impedance Track™ modeling and cell balancing decisions. |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ Technology | Real-time battery impedance analysis enables <1% SoC error across discharge rate, temperature, and aging-eliminates need for periodic full-charge learning cycles. |
| Integrated Dual Delta-Sigma ADCs | One ADC for ±0.2 V coulomb counting (10 µV offset), another for cell voltage/temperature-avoids external signal conditioning and improves measurement consistency. |
| Configurable Safety Architecture | Two-tier protection (primary + secondary) with programmable thresholds in flash memory-supports both fast-response fault handling and irreversible safety enforcement. |
| Smart Charger Control | Reports optimal CC/CV charging parameters and cell imbalance status via SMBus broadcasts-enables intelligent charger adaptation without host firmware changes. |
| SHA-1 Authentication | Verifies battery identity using challenge-response protocol-prevents unauthorized or non-OEM battery packs from operating in certified systems. |
Applications
| Notebook PC Battery Management | Portable Medical Instrumentation |
|---|---|
Use Scenario: Integrated into removable smart battery packs for business-class laptops requiring precise runtime estimation and OEM security. IC Role / Device Role / Timing Role: Primary SBS-compliant gas gauge and safety controller-interfaces with host EC via SMBus and coordinates with bq29330 AFE for cell-level monitoring. Use Value: Delivers <1% SoC accuracy across 500+ cycles and supports SHA-1 authentication to block counterfeit batteries, meeting OEM platform validation requirements. |
Use Scenario: Embedded in sealed battery modules for portable ECG monitors and infusion pumps where regulatory compliance and long-term reliability are critical. IC Role / Device Role / Timing Role: Gas gauge and dual-level protector-monitors cell voltage, temperature, and current while enforcing IEC 62368-1 compliant shutdown on overtemperature or overvoltage faults. Use Value: Enables 10-year data retention in internal flash for calibration history and meets medical-grade low-power sleep mode requirements (<50 µA with bq29330). |
| Test & Measurement Equipment | Industrial Portable Instrumentation |
Use Scenario: Used in handheld oscilloscopes and multimeters needing stable runtime prediction under variable load profiles and ambient temperatures. IC Role / Device Role / Timing Role: Real-time fuel gauge with Impedance Track™-compensates for discharge-rate-dependent voltage sag and aging-induced capacity loss. Use Value: Maintains ±0.8% SoC accuracy from 0.1C to 2C discharge rates and –20°C to 60°C, reducing user uncertainty during field measurements. |
Use Scenario: Deployed in ruggedized gas detectors and environmental sensors operating in harsh industrial environments with wide temperature swings. IC Role / Device Role / Timing Role: Battery health monitor and safety enforcer-tracks Qmax degradation, triggers SAFE output on critical faults, and logs protection events in nonvolatile memory. Use Value: Supports 10-year flash data retention and operates reliably at –40°C, enabling deployment in unheated outdoor enclosures without runtime drift. |
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 core architecture but adds integrated 32.768 kHz crystal oscillator (no external crystal required); otherwise identical pinout, firmware, and feature set. | Reduces BOM count by eliminating external crystal and load capacitors-ideal for space-constrained designs where PCB area is premium. | Select BQ20Z75-V110 when minimizing component count and layout complexity is prioritized over cost sensitivity. |
| BQ20Z90-V110 | Enhanced version with improved Impedance Track™ algorithm, lower quiescent current (8 µA sleep vs. 48 µA), and extended dataflash endurance (100k write cycles vs. 20k). | Targeted at next-gen platforms requiring longer battery shelf life and higher reliability-supports deeper sleep states and more frequent configuration updates. | Select BQ20Z90-V110 for new designs demanding >5-year field service life and frequent firmware-driven parameter reconfiguration. |
Compared with BQ20Z70PW-V110, the BQ20Z75-V110 reduces system-level component count without altering functionality, while the BQ20Z90-V110 extends operational lifetime and power efficiency-making it suitable for high-reliability, long-lifecycle deployments where maintenance intervals exceed three years.
Availability
BQ20Z70PW-V110 is available at Aetrix Electronics and suitable for notebook PC battery packs, portable medical instrumentation, test & measurement equipment, and industrial portable instrumentation requiring stable component supply, long-term lifecycle support, and SBS v1.1 compliance.
Supply support for BQ20Z70PW-V110 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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and battery management solutions.
The BQ20Z70PW-V110 belongs to TI's Smart Battery Fuel Gauge product line, engineered specifically for high-accuracy, secure, and standards-compliant battery monitoring in portable computing and mission-critical portable electronics.
FAQ
What is the primary function of the BQ20Z70PW-V110 in a smart battery system?
The BQ20Z70PW-V110 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; applies Impedance Track™ modeling to calculate remaining capacity with <1% error; enforces primary and secondary protection thresholds; and communicates results to the host via SMBus v1.1. Its design requires co-use with the bq29330 AFE for cell-level sensing.
Does the BQ20Z70PW-V110 require an external crystal oscillator?
No, the BQ20Z70PW-V110 includes a fully integrated low-frequency oscillator generating a precise 32.768 kHz clock internally-eliminating the need for an external crystal or load capacitors. This clock drives the bq29330 watchdog (via CLKOUT pin) and supports accurate time-based gauging functions. The high-frequency oscillator (4.194 MHz) is also on-chip and used for CPU timing.
How does the BQ20Z70PW-V110 achieve better than 1% gas-gauge accuracy over battery lifetime?
The BQ20Z70PW-V110 achieves this through Impedance Track™-a proprietary algorithm that continuously models battery impedance, open-circuit voltage, temperature, and aging effects in real time. Unlike coulomb counting alone, it dynamically adjusts capacity estimates based on actual cell behavior across discharge rates and cycle count, validated to maintain <1% error from 0% to 100% SoC over 500+ cycles without learning cycles.
Can the BQ20Z70PW-V110 operate independently without the bq29330 analog front-end?
No-the BQ20Z70PW-V110 is architecturally dependent on the bq29330 AFE. It relies on the bq29330 for cell voltage multiplexing, FET drive, overcurrent/short-circuit protection, and cell balancing control. Critical pins (VCELL+, VCELL–, SDATA, SCLK, XALERT, CLKOUT) are explicitly defined for direct interconnection with the bq29330, and no standalone operation mode is supported in the datasheet or application schematics.
What safety features does the BQ20Z70PW-V110 provide, and how are they implemented?
The BQ20Z70PW-V110 implements two-tier safety: primary (fast-response) features like cell over/under-voltage, charge/discharge overcurrent, and overtemperature detection; and secondary (fail-safe) features including safety overvoltage, overcurrent, and overtemperature-triggering the SAFE pin (pin 7) to permanently disable the pack. All thresholds are stored in field-programmable flash and configurable per application, with fault logging and SMBus-reportable status registers.
BQ20Z70PW-V110 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-V110 FAQ
1.How can I place an order for BQ20Z70PW-V110 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ20Z70PW-V110 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-V110 reliable?
The price and inventory of BQ20Z70PW-V110 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ20Z70PW-V110 is usually 5 days.
3.What payment methods are accepted for BQ20Z70PW-V110?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ20Z70PW-V110 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ20Z70PW-V110?
BQ20Z70PW-V110 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ20Z70PW-V110 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-V110?
For technical support, including BQ20Z70PW-V110 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ20Z70PW-V110 requirements.
6.How does Aetrix verify that BQ20Z70PW-V110 is sourced from the original manufacturer or authorized distributors?
All BQ20Z70PW-V110 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-V110 meets industry standards.
7.What is the process for return or replacement of BQ20Z70PW-V110?
All BQ20Z70PW-V110 units undergo pre-shipment inspection (PSI). If there is an issue with BQ20Z70PW-V110, 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-V110 part is unused and in its original packaging.
Return procedure for BQ20Z70PW-V110:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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