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Texas Instruments BQ20Z70PW-V160
- Part No.:
- BQ20Z70PW-V160
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ20Z70PW-V160.pdf
- Description:
- IC GAS GAUGE FOR BQ29330 20TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
BQ20Z70PW-V160 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 instrumentation. It delivers better than 1% gas-gauge accuracy over battery lifetime, integrates an 8-bit RISC CPU, two 16-bit delta-sigma ADCs, and supports SHA-1 authentication.
For engineers reviewing the BQ20Z70PW-V160 datasheet, BQ20Z70PW-V160 pinout, BQ20Z70PW-V160 application, or BQ20Z70PW-V160 equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative options, and supply-chain support for industrial and OEM battery-pack development.
Technical Context
The BQ20Z70PW-V160 implements a dual-ADC architecture: one integrating delta-sigma converter measures charge/discharge current via SRP/SRN (±0.2 V range, 0.65 nVh resolution), while another digitizes cell voltage, temperature, and thermistor inputs. It operates with the bq29330 analog front-end to enable full pack protection and cell balancing control.
Its Impedance Track™ algorithm continuously models battery impedance across discharge rate, temperature, and aging-enabling instant accuracy without learning cycles and supporting SBS-compliant SMBus v1.1 communication with PEC. The device features three power modes (Normal, Sleep, Shutdown) and internal 4.194 MHz + 32.768 kHz oscillators-no external crystals required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gas-gauge accuracy | Better than 1% error over battery lifetime-enables reliable runtime prediction without recalibration. |
| Current measurement | Integrating delta-sigma ADC with ±0.2 V input range and 0.65 nVh resolution-supports precise coulomb counting using 5–20 mΩ sense resistors. |
| Cell voltage monitoring | 16-bit delta-sigma ADC with configurable sampling via bq29330 multiplexer-enables per-cell voltage tracking and impedance calculation for Impedance Track™. |
| SMBus interface | SBS v1.1–compliant master/slave mode with PEC, 10–100 kHz clock, and automatic off-state detection after ≥2 s bus idle-ensures robust host communication in smart battery systems. |
| Power consumption | 400 µA typical operating current (bq20z70 only); 475 µA with bq29330; 8 µA in Sleep Mode-extends pack standby life without compromising safety monitoring. |
| Operating temperature | –40°C to +85°C-validated for use in notebook PCs, medical devices, and portable test equipment with wide ambient ranges. |
| Authentication | SHA-1–based secure authentication via dedicated command (0x2F)-prevents unauthorized charger or host interaction with the battery pack. |
Pinout & Package
20-pin TSSOP (PW) package, 6.4 mm × 4.4 mm × 1.2 mm max height, RoHS-compliant NiPdAu finish, MSL Level-1 (260°C reflow unlimited), tube packaging (70 units).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 XALERT | Interrupt input | Receives fault alerts from bq29330 AFE-triggers immediate safety response or host notification. |
| 2 TS2 / 3 TS1 | Analog thermistor inputs | Monitor dual NTC thermistors (e.g., Semitec 103AT) for battery temperature-enables charge/discharge inhibit and thermal protection. |
| 4 CLKOUT | 32.768 kHz output | Drives bq29330 watchdog timer-ensures AFE remains responsive during system sleep or low-power states. |
| 14 SRP / 15 SRN | Current-sense differential inputs | Connect across 5–20 mΩ shunt resistor-measures bidirectional charge/discharge current with auto-calibration capability. |
| 19 VCELL+ / 20 VCELL− | Differential cell voltage input | Interface to bq29330 CELL pins-enables accurate per-cell voltage acquisition for impedance modeling and balancing decisions. |
| 7 SAFE | Active-high safety output | Asserts to blow external fuse on critical faults (e.g., safety overvoltage/overcurrent)-provides hardware-level fail-safe isolation. |
| 8 SMBD / 10 SMBC | SMBus bidirectional lines | Open-drain interface compliant with SBS v1.1-supports standard battery data registers (e.g., RemainingCapacity, Temperature, BatteryStatus). |
| 16 MRST | Master reset input | Hardware reset synchronized with bq29330 XRST-ensures coordinated initialization of gas gauge and protection IC. |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ algorithm | Real-time impedance modeling eliminates learning cycles and maintains <1% SOC error across aging, temperature, and load variation. |
| Integrated dual delta-sigma ADCs | One dedicated to high-resolution current integration (0.65 nVh), another to voltage/temperature-reduces external component count and layout sensitivity. |
| Programmable safety hierarchy | Two-tier protection: primary (cell OVP/UVP, overtemp) and secondary (SAFE pin-triggered fuse blow)-enables fail-operational and fail-safe behavior. |
| Field-programmable FLASH memory | 20,000 write cycles, 10-year data retention-stores calibration coefficients, chemistry parameters, and custom thresholds without external EEPROM. |
| Smart charger coordination | Reports optimal charging current/voltage via SMBus broadcasts and supports pre-charge, fast-charge, and zero-volt recovery-enables adaptive charging algorithms. |
Applications
| Notebook PC Battery Packs | Medical Portable Diagnostic Devices |
|---|---|
Use Scenario: Integrated into removable Li-ion battery packs for ultraportable laptops requiring precise runtime estimation and SBS compliance. IC Role / Device Role / Timing Role: Primary gas gauge and SMBus interface controller-manages capacity reporting, safety alarms, and charger handshaking per SBS v1.1. Use Value: Delivers >99% runtime accuracy across 300+ cycles without recalibration-reducing user-reported "battery drain" complaints and warranty returns. |
Use Scenario: Embedded in sealed battery modules for handheld ultrasound or ECG monitors needing FDA-grade reliability and thermal safety. IC Role / Device Role / Timing Role: Dual-thermistor–monitored fuel gauge with secondary safety output (SAFE pin)-enables redundant overtemperature shutdown and audit-ready event logging. Use Value: Supports Class II medical device certification via SHA-1 authentication, dual-level protection, and traceable flash-stored calibration data. |
| Industrial Portable Test Equipment | High-Accuracy Field Instrumentation |
Use Scenario: Used in battery-powered multimeters and oscilloscopes where stable runtime and low self-discharge are critical between calibrations. IC Role / Device Role / Timing Role: Low-power gas gauge in Sleep Mode (8 µA with bq29330)-maintains state-of-charge during 6-month storage without periodic wake-up. Use Value: Achieves <1% capacity drift over 12 months at 25°C-eliminates need for field recalibration and extends service intervals. |
Use Scenario: Deployed in ruggedized environmental sensors operating in remote locations with infrequent maintenance windows. IC Role / Device Role / Timing Role: Cell-balancing enabler working with bq29330-equalizes series cells during charging to prevent premature termination and extend usable energy. Use Value: Increases effective pack capacity by up to 8% over 200 cycles-directly extending deployment duration in solar-charged sensor nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas-gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ20Z75PW-V160 | Enhanced firmware with extended SBS command set (e.g., PackVoltage, StateOfHealth), same pinout and electrical specs. | Supports deeper diagnostics and health reporting-preferred for next-gen smart batteries requiring predictive maintenance data. | Select when advanced telemetry (e.g., SOH, PFStatus) is required; backward-compatible with BQ20Z70PW-V160 firmware interfaces. |
| BQ20Z65-R1PW | Legacy variant with identical Impedance Track™ core but no SHA-1 authentication and reduced FLASH endurance (10k cycles vs. 20k). | Lacks cryptographic security-suitable only for cost-sensitive consumer applications where authentication is not mandated. | Choose only for non-security-critical designs; not recommended for medical or industrial deployments requiring tamper resistance. |
Compared with BQ20Z70PW-V160, the BQ20Z75PW-V160 adds diagnostic depth without changing hardware integration, while the BQ20Z65-R1PW sacrifices security and longevity for lower BOM cost-making BQ20Z70PW-V160 the balanced choice for certified, field-deployed smart battery systems.
Availability
BQ20Z70PW-V160 is available at Aetrix Electronics and suitable for notebook PC battery packs, portable medical diagnostics, and industrial test equipment requiring stable component supply, long-lifecycle support, and SBS v1.1 compliance.
Supply support for BQ20Z70PW-V160 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-V160 belongs to TI's Smart Battery Fuel Gauge product line, engineered specifically for high-accuracy, SBS-compliant Li-ion/Li-polymer battery packs in portable computing and mission-critical portable instrumentation.
FAQ
What is the primary function of the BQ20Z70PW-V160 in a smart battery system?
The BQ20Z70PW-V160 serves as the core gas gauge and SMBus interface controller in smart battery systems. It uses Impedance Track™ technology to measure and report remaining capacity, voltage, temperature, and health metrics to the host system. It works in tandem with the bq29330 AFE to execute protection, balancing, and authentication functions-all while maintaining SBS v1.1 compliance. Its role is central to runtime accuracy, safety enforcement, and charger coordination in the BQ20Z70PW-V160–based battery pack.
Does the BQ20Z70PW-V160 require external components for oscillator operation?
No, the BQ20Z70PW-V160 fully integrates both a 4.194 MHz high-frequency oscillator and a 32.768 kHz low-frequency oscillator-eliminating the need for external crystals or resonators. This integration reduces bill-of-materials cost and PCB area while ensuring timing stability across –40°C to +85°C. The 32.768 kHz output (CLKOUT, Pin 4) is specifically routed to drive the bq29330 watchdog, confirming tight co-design between the BQ20Z70PW-V160 and its companion AFE.
How does the BQ20Z70PW-V160 achieve better than 1% gas-gauge accuracy over battery lifetime?
The BQ20Z70PW-V160 achieves better than 1% accuracy through patented Impedance Track™ technology, which continuously models battery impedance in real time-accounting for discharge rate, temperature, aging, and cell-to-cell variation. Unlike coulomb-counting-only gauges, it correlates voltage, current, and temperature measurements to dynamically adjust capacity estimates. This eliminates learning cycles and maintains precision across 300+ charge/discharge cycles, as validated in TI's SLUS686B datasheet for the BQ20Z70PW-V160.
Can the BQ20Z70PW-V160 operate independently without the bq29330 analog front-end?
No-the BQ20Z70PW-V160 is designed to operate exclusively with the bq29330 AFE. Its pinout (e.g., VCELL+, VCELL−, SDATA, SCLK, XALERT, CLKOUT) and functional blocks (cell voltage acquisition, FET control, safety outputs) assume direct interconnection to the bq29330. While the BQ20Z70PW-V160 contains the computation engine and SMBus interface, all analog sensing, protection switching, and cell multiplexing are delegated to the bq29330. Standalone operation is neither supported nor electrically feasible.
What safety features does the BQ20Z70PW-V160 provide, and how are they implemented?
The BQ20Z70PW-V160 implements a two-tier safety architecture: primary protection (cell over/under-voltage, overcurrent, overtemperature) handled internally and reported via SMBus alarms; and secondary protection asserted on the SAFE pin (Pin 7) for catastrophic faults like safety overvoltage or AFE communication failure. The SAFE signal is intended to trigger irreversible actions-e.g., blowing a fuse-to disable the pack. This layered approach ensures both recoverable warnings and hardware-enforced shutdown, as defined in the BQ20Z70PW-V160's safety feature set and validated in TI application notes.
BQ20Z70PW-V160 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Impedance Track™
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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-V160 FAQ
1.How can I place an order for BQ20Z70PW-V160 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ20Z70PW-V160 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-V160 reliable?
The price and inventory of BQ20Z70PW-V160 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ20Z70PW-V160 is usually 5 days.
3.What payment methods are accepted for BQ20Z70PW-V160?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ20Z70PW-V160 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ20Z70PW-V160?
BQ20Z70PW-V160 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ20Z70PW-V160 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-V160?
For technical support, including BQ20Z70PW-V160 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ20Z70PW-V160 requirements.
6.How does Aetrix verify that BQ20Z70PW-V160 is sourced from the original manufacturer or authorized distributors?
All BQ20Z70PW-V160 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-V160 meets industry standards.
7.What is the process for return or replacement of BQ20Z70PW-V160?
All BQ20Z70PW-V160 units undergo pre-shipment inspection (PSI). If there is an issue with BQ20Z70PW-V160, 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-V160 part is unused and in its original packaging.
Return procedure for BQ20Z70PW-V160:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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