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Texas Instruments BQ79654PAPRQ1
- Part No.:
- BQ79654PAPRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 64-PowerTQFP
- Datasheet:
-
BQ79654PAPRQ1.pdf
- Description:
- AUTOMOTIVE 14-S PRECISION BATTER
- Quantity:
- Payment:
- Shipping:
Inventory:996
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Product details
Overview
BQ79654PAPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive battery monitor IC for 14-cell (14S) lithium-ion battery packs, delivering ±1.5 mV cell voltage measurement accuracy, integrated current sensing via SRP/SRN inputs, and autonomous 240 mA internal cell balancing with thermal pause/resume control. It operates across –40°C to +125°C ambient and supports daisy-chain communication for BMS stack scalability in hybrid/electric powertrain systems.
For engineers reviewing the BQ79654PAPRQ1 datasheet, BQ79654PAPRQ1 pinout, BQ79654PAPRQ1 application, or BQ79654PAPRQ1 equivalent, key selection criteria include ASIL D functional safety compliance, 128 µs full-cell-voltage acquisition time, HTQFP-64 package compatibility, and pin/software interoperability within the BQ7965x-Q1 family for scalable 12S/14S/16S designs.
Technical Context
The BQ79654PAPRQ1 implements a high-speed, multi-channel delta-sigma ADC architecture with post-ADC configurable digital low-pass filters to deliver DC-like voltage measurements, synchronized shunt-based current sensing, and redundant diagnostics for voltage, temperature, and current paths. Its isolated daisy-chain interface supports ring topology and embeds fault signaling and heartbeat monitoring over the communication line.
It integrates a 5 V LDO (CVDD), 1.8 V digital supply (DVDD), analog rail (AVDD), and negative charge pump (NEG5V) to power internal circuitry and external isolators, while its GPIOs support NTC thermistor biasing (TSREF), external voltage monitoring, and SPI master operation - all under ISO 26262 system-level design guidance for ASIL D implementation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | Configured for 14-series (14S) battery modules; supports 6S–14S range with full functionality |
| Cell Voltage Accuracy | ±1.5 mV - enables precise state-of-charge (SoC) and state-of-health (SoH) estimation in automotive BMS |
| Full-Cell Acquisition Time | ≤128 µs - allows rapid snapshot capture of all 14 cell voltages for real-time balancing decisions |
| Internal Balancing Current | 240 mA per channel - delivers active energy redistribution without external FETs or heatsinks |
| Operating Temperature | –40°C to +125°C ambient - qualified per AEC-Q100 Grade 1 for under-hood and traction battery applications |
| Functional Safety Level | Hardware and systematic capability up to ASIL D - includes documentation for ISO 26262 integration and built-in redundancy diagnostics |
| Current Sense Interface | Differential SRP/SRN inputs - supports shunt-based current measurement with synchronization to voltage sampling for improved SoC calculation |
Pinout & Package
Package: HTQFP-64 (PAP), 10.00 mm × 10.00 mm, thermally enhanced quad flat pack with exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT | Module top-rail supply and sense reference | Connects to positive terminal of topmost cell; serves as primary analog power input and daisy-chain reference point |
| VC0–VC14 | Cell voltage sense inputs | Differential inputs for cells 0 through 14; VC0 is cell 1 negative terminal, VC14 is cell 14 positive terminal |
| CB0–CB14 | Cell balance FET connections | Direct connection points to internal balancing FETs; RC filter resistors set 240 mA balancing current |
| SRP / SRN | Shunt current sense differential pair | Enables high-accuracy bidirectional current measurement with programmable gain and synchronization to voltage ADC |
| COMHP / COMHN / COMLP / COMLN | Daisy-chain transceiver I/O | Isolated differential interface supporting vertical stack communication and optional ring architecture with embedded fault signaling |
| CVDD / DVDD / AVDD / NEG5V | Integrated power rails | 5 V daisy-chain/I/O supply (CVDD), 1.8 V digital core (DVDD), 5 V analog (AVDD), and –4.6 V charge pump (NEG5V) for ADC and isolation drivers |
Key Features
| Feature | Design Value |
|---|---|
| ASIL D Functional Safety Architecture | Includes hardware redundancy paths for voltage, temperature, and current diagnostics plus ISO 26262 documentation support for system-level certification |
| Autonomous Thermal-Aware Balancing | Automatic pause/resume of 240 mA balancing based on die temperature - prevents thermal runaway during extended equalization |
| Synchronized Current & Voltage Sampling | Shunt current measurement aligned with cell voltage acquisition - improves Coulomb counting accuracy for SoC estimation |
| Configurable Digital Low-Pass Filtering | Post-ADC filtering eliminates noise without external analog components - simplifies front-end RC design and improves EMI robustness |
| Embedded Communication Diagnostics | Fault signal and heartbeat transmitted over daisy-chain line - enables real-time stack health monitoring without host polling overhead |
Applications
| Electric Powertrain Battery Pack | 48V Mild Hybrid System |
|---|---|
Use Scenario: Monitoring and balancing 14S Li-ion modules in traction inverters and onboard chargers for PHEVs and BEVs. IC Role / Device Role / Timing Role: Primary cell monitor and balancer in distributed BMS architecture; acquires full 14-cell voltage set in ≤128 µs for real-time state estimation. Use Value: Enables accurate SoC/SoH tracking under dynamic load conditions and supports functional safety requirements up to ASIL D for ISO 26262-compliant vehicle platforms. |
Use Scenario: Managing 48V battery stacks in 48V mild hybrid vehicles with regenerative braking and start-stop functionality. IC Role / Device Role / Timing Role: Standalone or stacked monitor providing voltage, temperature, and current data to central BMS controller via daisy-chain interface. Use Value: Reduces bill-of-materials by integrating 5 V LDO (CVDD), 1.8 V digital supply (DVDD), and negative charge pump - eliminating need for external regulators and isolator bias supplies. |
| E-Bike / E-Scooter Battery Pack | Energy Storage System (ESS) Rack |
Use Scenario: Compact, high-reliability BMS for consumer-grade e-mobility batteries requiring overvoltage, undervoltage, and overtemperature protection. IC Role / Device Role / Timing Role: Integrated hardware protector with configurable OV/UV/OT/UT comparators and autonomous balancing - reduces MCU intervention latency. Use Value: Delivers certified AEC-Q100 Grade 1 performance in non-automotive environments, enabling reuse of automotive-grade reliability and safety features in cost-sensitive mobility applications. |
Use Scenario: Modular BMS node in stationary grid-scale or commercial ESS racks where scalability and long-term calibration stability are critical. IC Role / Device Role / Timing Role: Stackable monitor supporting ring-architecture daisy chain - enables fault-tolerant communication across dozens of series-connected modules. Use Value: Built-in redundancy diagnostics and ±1.5 mV accuracy ensure decade-long calibration retention and minimize maintenance cycles in mission-critical energy infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ79656PAPRQ1 | Supports up to 16S configuration; identical pinout, software, and feature set except for extended cell count and additional VC15/VC16/CB15/CB16 pins (NC on BQ79654PAPRQ1) | Required for >14S battery stacks; otherwise functionally interchangeable in 14S designs with unused pins tied to BAT | Select when future scalability to 16S is needed or when consolidating inventory across 12S/14S/16S variants |
| BQ79652PAPRQ1 | Supports up to 12S configuration; shares same HTQFP-64 package and software framework but omits VC13–VC14 and CB13–CB14 pins (NC on BQ79654PAPRQ1) | Optimized for compact 12S packs; not suitable for 14S without redesign due to missing sense/balance channels | Prefer for cost-sensitive 12S applications where full 14S capability is unnecessary and PCB layout reuse is prioritized |
Compared with BQ79654PAPRQ1, the BQ79656PAPRQ1 offers headroom for 16S expansion with no layout change, while the BQ79652PAPRQ1 reduces channel count for smaller packs - all three share identical safety architecture, timing performance, and supply regulation, enabling unified firmware development across vehicle platforms.
Availability
BQ79654PAPRQ1 is available at Aetrix Electronics and suitable for electric powertrain battery management, 48V mild hybrid systems, and e-mobility applications requiring stable component supply, automotive qualification, and long-term lifecycle support.
Supply support for BQ79654PAPRQ1 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 automotive ICs, with decades of experience in battery management and functional safety solutions.
The BQ7965x-Q1 product line is designed specifically for ASIL D-compliant automotive BMS applications, integrating precision monitoring, hardware protection, and scalable daisy-chain communication into a single-package solution for traction battery systems.
FAQ
What is the maximum supported battery stack configuration for the BQ79654PAPRQ1?
The BQ79654PAPRQ1 is configured for 14-series (14S) battery modules and supports operation across a 6S to 14S range. It provides dedicated sense inputs (VC0–VC14) and balancing connections (CB0–CB14) for all 14 cells, with unused pins on lower-channel variants (e.g., BQ79652PAPRQ1) tied to BAT per TI's Cell Connections guidance. The BQ79654PAPRQ1 does not support 15S or 16S configurations - those require BQ79656PAPRQ1.
Does the BQ79654PAPRQ1 include integrated functional safety features required for ASIL D compliance?
Yes, the BQ79654PAPRQ1 is developed for functional safety applications with documented hardware and systematic capability up to ASIL D per ISO 26262. It includes built-in redundancy paths for voltage, temperature, and current diagnostics, embedded fault signaling over daisy-chain, and comprehensive safety documentation - including FMEDA reports and safety manuals - to support system-level certification of automotive BMS designs.
How does the internal cell balancing operate on the BQ79654PAPRQ1, and what is its current rating?
The BQ79654PAPRQ1 provides autonomous internal cell balancing with a nominal current of 240 mA per channel. Balancing is thermally managed: the device automatically pauses balancing when die temperature exceeds the thermal warning threshold and resumes once temperature falls below the hysteresis level. The balancing current is set by external RC filter resistors connected to CBn pins, and thermal control avoids overtemperature conditions without host MCU intervention.
Can the BQ79654PAPRQ1 perform simultaneous current and voltage measurements?
Yes, the BQ79654PAPRQ1 supports synchronized shunt-based current sensing via SRP/SRN inputs and cell voltage measurement via VCn pins. This synchronization enables correlated sampling for improved state-of-charge (SoC) calculation accuracy, especially during dynamic load transitions. The current sense ADC is integrated and shares timing control with the main cell voltage ADC, ensuring deterministic phase alignment between current and voltage data streams.
What communication interfaces does the BQ79654PAPRQ1 support for host connectivity and inter-device stacking?
The BQ79654PAPRQ1 supports UART for direct host MCU communication and isolated daisy-chain communication using differential COMHP/COMHN/COMLP/COMLN pins. The daisy-chain interface supports both linear and ring architectures, includes embedded fault signaling and heartbeat monitoring, and operates independently of the host UART. It does not support native SPI or I²C host interfaces - those require companion devices like the BQ79600-Q1 bridge IC.
BQ79654PAPRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 64-PowerTQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- -
- Number of Cells:
- 1
- Fault Protection:
- Over Temperature
- Interface:
- SPI, UART
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-HTQFP (10x10)
BQ79654PAPRQ1 FAQ
1.How can I place an order for BQ79654PAPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ79654PAPRQ1 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 BQ79654PAPRQ1 reliable?
The price and inventory of BQ79654PAPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ79654PAPRQ1 is usually 5 days.
3.What payment methods are accepted for BQ79654PAPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ79654PAPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ79654PAPRQ1?
BQ79654PAPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ79654PAPRQ1 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 BQ79654PAPRQ1?
For technical support, including BQ79654PAPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ79654PAPRQ1 requirements.
6.How does Aetrix verify that BQ79654PAPRQ1 is sourced from the original manufacturer or authorized distributors?
All BQ79654PAPRQ1 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 BQ79654PAPRQ1 meets industry standards.
7.What is the process for return or replacement of BQ79654PAPRQ1?
All BQ79654PAPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with BQ79654PAPRQ1, 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 BQ79654PAPRQ1 part is unused and in its original packaging.
Return procedure for BQ79654PAPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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