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Texas Instruments BQ79656PAPRQ1
- Part No.:
- BQ79656PAPRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 64-PowerTQFP
- Datasheet:
-
BQ79656PAPRQ1.pdf
- Description:
- AUTOMOTIVE 16-S PRECISION BATTER
- Quantity:
- Payment:
- Shipping:
Inventory:1,739
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Product details
Overview
BQ79656PAPRQ1 from Texas Instruments is a functional safety-compliant automotive 16-cell battery monitor IC with integrated cell balancing, ±1.5 mV ADC accuracy, 128 µs full-channel voltage measurement, and shunt-based current sensing. It serves as the core voltage, temperature, and current acquisition unit in high-reliability BMS for traction batteries up to 80 V.
For engineers reviewing the BQ79656PAPRQ1 datasheet, BQ79656PAPRQ1 pinout, BQ79656PAPRQ1 application, or BQ79656PAPRQ1 equivalent, this page delivers verified technical context, ASIL-D–capable diagnostics, daisy-chain communication architecture, and real-world BMS integration constraints - all grounded in TI's production-grade SLUSE48C specification.
Technical Context
The BQ79656PAPRQ1 implements a dual-path analog front end: main ADC for cell voltages (VC0–VC16) and auxiliary ADC for current sense (SRP/SRN) and thermistors (GPIOs), both synchronized for SOC accuracy. Its integrated digital low-pass filters post-ADC enable DC-like voltage readings without external averaging.
It supports autonomous balancing across all 16 cells at up to 240 mA per FET, with thermal management that pauses/resumes based on die temperature (TSHUT = 137°C typ., TWARN = 100°C typ.). Communication uses isolated differential daisy chain (COMHP/COMHN/COMLP/COMLN) with embedded fault signaling and heartbeat, plus UART/SPI bridge capability via BQ79600-Q1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | 16-series (6S–16S) battery modules - enables direct monitoring of full EV traction packs without external multiplexing |
| ADC Accuracy | ±1.5 mV - ensures <0.03% error at 5 V cell, critical for state-of-charge and state-of-health algorithms |
| Measurement Speed | 128 µs for all 16 cells - meets ISO 26262 ASIL-D timing requirements for fast fault detection |
| Current Sensing | Shunt-based (SRP/SRN), ±100 mV range - supports high-precision Coulomb counting with hardware-synchronized sampling |
| Functional Safety | ASIL D systematic & hardware capability - includes built-in redundancy paths for voltage, temperature, and current diagnostics |
| Supply Outputs | 5 V AVDD (50 mA), 1.8 V DVDD (53 mA), 5 V CVDD (85 mA), 5 V TSREF (52 mA) - powers internal circuits and external sensors/isolators |
| Operating Temp | –40°C to +125°C ambient - qualified per AEC-Q100 Grade 1 for under-hood and module-integrated BMS placement |
Pinout & Package
64-pin HTQFP (PAP), 10.00 mm × 10.00 mm body size, 0.5 mm pitch, exposed thermal pad - optimized for automotive PCB thermal management and daisy-chain stack routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT | Module top voltage input | Connects to positive terminal of highest cell; supplies bias for internal regulators and defines measurement reference for VC16 |
| VC0–VC16 | Differential cell voltage inputs | Direct connection points for 17-node battery string (VC0 = bottom, VC16 = top); support RC filtering per channel |
| CB0–CB16 | Cell balance FET terminals | Internal 240 mA balancing path per cell; resistor on CBn sets current; NC pins on lower-channel variants tied to BAT |
| SRP / SRN | Current sense differential inputs | Accept ±100 mV shunt voltage; enable hardware-synchronized current sampling with cell voltage acquisition |
| COMHP / COMHN / COMLP / COMLN | Daisy-chain transceiver I/O | Isolated differential interface supporting ring or linear topology; enables >100-device stacks with embedded fault signaling |
| TSREF | NTC bias reference | 5 V precision output for thermistor dividers; bypassed to CVSS; enables accurate temperature measurement across 8 GPIOs |
| NFAULT | Active-low fault indicator | Open-drain output asserting on OV/UV/OT/UT/communication faults; pulled up to CVDD for host MCU interrupt |
Key Features
| Feature | Design Value |
|---|---|
| Integrated hardware protector | On-die comparators for overvoltage, undervoltage, overtemperature, and undertemperature - triggers NFAULT without host intervention |
| Autonomous cell balancing | 240 mA per channel with thermal pause/resume logic - prevents local hot spots during extended balancing cycles |
| Redundant diagnostics path | Dedicated analog path for voltage, temperature, and current validation - satisfies ASIL-D diagnostic coverage requirements |
| Configurable digital low-pass filters | Post-ADC filtering eliminates need for external RC networks - simplifies layout and improves noise immunity in high-EMI EV environments |
| UART/SPI bridge compatibility | Interoperates with BQ79600-Q1 to convert daisy-chain data to UART/SPI - enables flexible host interface selection without custom firmware |
Applications
| Electric Vehicle Traction Battery | Hybrid Powertrain BMS |
|---|---|
Use Scenario: Real-time monitoring of 16S Li-ion/LiFePO₄ modules in 400–800 V traction inverters with active thermal management. IC Role / Device Role / Timing Role: Primary cell voltage, temperature, and current acquisition node; performs sub-130 µs full-stack measurement for ASIL-D fault response. Use Value: Enables precise SOC/SOH estimation and cell-level balancing to extend pack life and prevent thermal runaway. |
Use Scenario: Compact BMS for 12S–16S 48–80 V hybrid starter-generator and regenerative braking systems. IC Role / Device Role / Timing Role: Standalone monitor with integrated LDOs powering isolators and microcontrollers; operates across –40°C to +125°C without derating. Use Value: Reduces bill-of-materials by eliminating external regulators and discrete protection ICs while meeting AEC-Q100 Grade 1. |
| Commercial E-Bike Battery Pack | Energy Storage System (ESS) Rack |
Use Scenario: High-density 16S lithium battery pack for Class 4 e-bikes requiring UL 2849 compliance and overcurrent shutdown. IC Role / Device Role / Timing Role: Fault-detecting monitor with hardware-based OV/UV/OT protection and 240 mA balancing - acts as primary safety layer. Use Value: Eliminates need for secondary protection circuitry; NFAULT output directly controls MOSFET gate drivers for fail-safe disconnect. |
Use Scenario: Modular 16S BMS node in scalable 48 V–1000 V stationary storage racks with daisy-chained communication. IC Role / Device Role / Timing Role: Stackable daisy-chain node supporting ring architecture; COM interface handles >100 devices with embedded heartbeat and fault propagation. Use Value: Enables centralized cloud-based monitoring without gateway complexity; reduces wiring harness cost and failure points. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ79616PAPRQ1 | Same 16S architecture but lacks integrated current sense ADC and TSREF output; requires external current sensor and bias circuit | Suitable for cost-sensitive designs where current sensing is handled externally or omitted | Select BQ79656PAPRQ1 when shunt-based current measurement and NTC biasing must be integrated on-die |
| MAX17853GTP/V+ | 16S monitor with ±2 mV accuracy, no integrated balancing FETs, SPI-only interface, no daisy-chain ring mode | Targeted at industrial ESS with simpler communication and external balancing control | Choose BQ79656PAPRQ1 for automotive ASIL-D compliance, autonomous balancing, and fault-tolerant daisy-chain topology |
Compared with BQ79616PAPRQ1, BQ79656PAPRQ1 adds integrated current sensing and thermal biasing - reducing component count and improving SOC accuracy. Against MAX17853GTP/V+, it delivers higher functional safety assurance, on-chip balancing, and robust isolated communication for automotive-grade reliability.
Availability
BQ79656PAPRQ1 is available at Aetrix Electronics and suitable for electric vehicle traction battery systems, hybrid powertrain BMS, commercial e-bike battery packs, and energy storage system racks requiring stable component supply, long-term lifecycle support, and AEC-Q100 Grade 1 qualification.
Supply support for BQ79656PAPRQ1 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 battery monitoring - integrating precision measurement, hardware protection, and daisy-chain scalability into a single package for traction and 48 V mild-hybrid systems.
FAQ
What is the maximum supported battery module voltage for BQ79656PAPRQ1?
The BQ79656PAPRQ1 supports total module voltages from 9 V to 80 V in normal operation, with full functionality including OTP programming enabled between 11 V and 80 V. This range accommodates 16S Li-ion (up to ~64 V) and 16S LFP (up to ~51 V) configurations while maintaining ±1.5 mV measurement accuracy and ASIL-D diagnostic coverage across the entire operating window.
Does BQ79656PAPRQ1 require external components for cell balancing?
No - BQ79656PAPRQ1 integrates 16 dedicated cell balancing FETs capable of 240 mA per channel. External RC filters on CBn pins set balancing current and provide noise suppression; no external MOSFETs, drivers, or thermal sensors are required. The device autonomously manages thermal pause/resume based on die temperature, eliminating host software overhead.
How does BQ79656PAPRQ1 achieve ASIL-D compliance?
BQ79656PAPRQ1 achieves ASIL-D compliance through dual independent diagnostic paths (main and redundancy ADCs), hardware-based OV/UV/OT/UT comparators with NFAULT assertion, built-in memory ECC, clock and power supply monitors, and documentation aligned with ISO 26262 Part 5/6. Its systematic capability and hardware metrics are certified per TI's functional safety analysis report for SLUSE48C.
Can BQ79656PAPRQ1 measure current without external amplifiers?
Yes - BQ79656PAPRQ1 includes a dedicated current sense ADC with ±100 mV input range on SRP/SRN pins, supporting direct connection to shunt resistors. It provides hardware-synchronized sampling with cell voltage measurements, enabling accurate Coulomb counting without external op-amps or signal conditioning circuitry.
What communication interfaces does BQ79656PAPRQ1 support natively?
BQ79656PAPRQ1 natively supports isolated differential daisy-chain communication via COMHP/COMHN/COMLP/COMLN pins, including optional ring architecture and embedded fault signaling. It also features UART and SPI host interfaces - either directly or through companion device BQ79600-Q1 acting as a protocol bridge.
BQ79656PAPRQ1 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-HTQFP (10x10)
BQ79656PAPRQ1 FAQ
1.How can I place an order for BQ79656PAPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ79656PAPRQ1 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 BQ79656PAPRQ1 reliable?
The price and inventory of BQ79656PAPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ79656PAPRQ1 is usually 5 days.
3.What payment methods are accepted for BQ79656PAPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ79656PAPRQ1 transactions.
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4.How is shipping managed for BQ79656PAPRQ1?
BQ79656PAPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ79656PAPRQ1 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 BQ79656PAPRQ1?
For technical support, including BQ79656PAPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ79656PAPRQ1 requirements.
6.How does Aetrix verify that BQ79656PAPRQ1 is sourced from the original manufacturer or authorized distributors?
All BQ79656PAPRQ1 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 BQ79656PAPRQ1 meets industry standards.
7.What is the process for return or replacement of BQ79656PAPRQ1?
All BQ79656PAPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with BQ79656PAPRQ1, 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 BQ79656PAPRQ1 part is unused and in its original packaging.
Return procedure for BQ79656PAPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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