BQ79656PAPRQ1 - 16S ASIL-D Battery Monitor, Balancer | TI
MPN: BQ79656PAPRQ1 β Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
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| 500 | $0 | $0.00 |
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BQ79656PAPRQ1 Overview
A battery monitor IC is a mixed-signal power-management device that measures individual cell voltages, temperatures and pack current in multi-cell battery stacks. It sits at the lowest level of the battery management system (BMS) hierarchy, feeding a pack-level controller over a daisy-chained differential bus. Accurate cell measurement is the foundation of state-of-charge estimation, cell balancing, fault protection and functional-safety compliance in automotive and industrial energy storage systems.
Key features include high-accuracy cell voltage measurement of up to 16 series cells, a complete stack scan in less than 200 us, a passive balancing architecture supporting up to 240 mA balancing current per TI listing, and an integrated hardware protector for autonomous overvoltage and undervoltage fault response. The integrated shunt current-sense front end removes the need for a separate current-sense device in many BMS topologies.
The BQ7965x-Q1 family (BQ79656-Q1/16S, BQ79654-Q1/14S, BQ79652-Q1/12S) shares a common architecture and supports stack configurations from a minimum of 6S, so a single PCB design can be scaled across battery module sizes. The integrated front-end filters enable simple, low-voltage-rated differential daisy-chain communication between stacked devices, improving EMC robustness in high-voltage traction inverters and packs. Functional-safety compliance to ASIL-D targets supports ISO 26262-driven designs.
Typical applications include electric-vehicle (EV) and hybrid (HEV) traction battery modules, 48V mild-hybrid systems, energy storage systems, and e-mobility packs such as e-bikes and light electric vehicles where 16S monitoring, balancing and safety protection are required.
Design-wise, follow TI's daisy-chain layout guidance: use twisted or tightly coupled differential bus pairs, place the integrated front-end filter components close to the device pins, and verify balancing thermal dissipation in the 10x10 mm HTQFP footprint.
This page adds information gain beyond the manufacturer datasheet: distributor availability comparison, drop-in same-family alternatives, and application-specific design notes not found on TI.com.
Drop-in alternatives for BQ79656PAPRQ1 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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BQ79654PAPRQ1
β Drop-Inπ Reference alternative (not in catalog)
BQ79652PAPRQ1
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View Datasheet βBQ79656PAPRQ1 Specifications
| Cell Count (Max) | 16S |
| Cell Count (Min) | 6S |
| Function | Battery monitor, balancer, integrated hardware protector, current sense |
| Functional Safety | ASIL-D compliant |
| Qualification | Automotive (AEC-Q100 Grade 1) |
| Stack Scan Time | < 200 us |
| Balancing Current | 240 mA |
| Current Sensing | Integrated shunt-resistor current sense |
| Communication Interface | Differential daisy-chain, SPI support |
| Operating Temperature | -40C to +125C |
| Package | HTQFP-64 (PAP), 10x10 mm |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
BQ79656PAPRQ1 htqfp-64 (pap), 10x10 mm Pin Configuration Guide
Pin configuration for BQ79656PAPRQ1 (htqfp-64 (pap), 10x10 mm package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for BQ79656PAPRQ1.
Refer to the datasheet for full pin configuration.
Typical Applications
BQ79656PAPRQ1 is suitable for 6 applications: EV Traction Battery Modules, 48V Mild-Hybrid Battery Systems, Stationary Energy Storage Systems, E-Mobility and Light Electric Vehicles, Battery Test and Formation Equipment, Industrial High-Voltage DC Systems.
EV Traction Battery Modules
The BQ79656PAPRQ1 is purpose-built for electric-vehicle traction battery modules that require 16-series-cell monitoring. Its sub-200 us full-stack scan gives the pack controller fast, coherent cell voltages for state-of-charge estimation and rapid fault detection, while ASIL-D functional-safety compliance supports ISO 26262 safety goals for high-voltage packs. The integrated hardware protector responds autonomously to overvoltage and undervoltage events even if the communication domain fails, a key redundancy for safety ratings. The integrated shunt current-sense front end replaces a discrete current-sense monitor in many architectures, reducing BOM count. Its differential daisy-chain bus with integrated front-end filters lets several devices span a 400V-800V string using simple low-voltage-rated components, and the -40C to +125C AEC-Q100 range covers underbody module environments.
Recommended
48V Mild-Hybrid Battery Systems
In 48V mild-hybrid and P0/P2 hybrid architectures, battery stacks typically use 12S-16S lithium cells, exactly matching the BQ79656PAPRQ1's 6S-16S configurable range. The fast stack scan (less than 200 us) supports the dynamic charge-acceptance monitoring needed for regenerative braking events, and the 240 mA passive balancing per channel keeps cell spread controlled in compact 48V packs with limited thermal mass. The integrated current sensing via shunt resistor simplifies current and power telemetry at the pack level, useful for hybrid energy-management algorithms. The ASIL-D-compliant monitor with hardware protector meets the safety requirements of torque-path-adjacent 48V systems. Differential daisy-chain communication tolerates the EMC environment near belt-starter generators, and the common footprint allows the same PCB to serve 12S, 14S, or 16S 48V pack variants.
Recommended
Stationary Energy Storage Systems
Grid-tied and commercial energy storage systems (ESS) built on 16S LFP prismatic modules benefit from the BQ79656PAPRQ1's high cell-count coverage and precise measurement chain. Accurate cell voltages under 200 us scan windows enable reliable state-of-charge balancing across parallel strings, extending usable capacity and calendar life. The integrated hardware protector provides a hardware-level safety net against cell overcharge even when the supervisory MCU is offline - valuable for unattended ESS installations. Shunt-based current sensing supports coulomb counting for long-lifetime SOC tracking, and SPI support eases integration with the site controller. While automotive Q1 qualification exceeds typical ESS requirements, it delivers margin for harsh outdoor container environments spanning -40C to +125C, and the family scaling to 12S/14S simplifies product-line variants across module sizes.
Recommended
E-Mobility and Light Electric Vehicles
E-bikes, e-scooters, e-mopeds and light electric vehicles commonly use 13S-16S lithium packs, squarely within the BQ79656PAPRQ1's range. Although ASIL-D capability exceeds LEV minimum requirements, it provides future-proofing for performance e-motorcycles approaching automotive safety norms. The sub-200 us scan rate detects fast cell-level anomalies that slow monitoring can miss during high-discharge acceleration, and the integrated hardware protector adds a redundant safety layer in compact packs where thermal margins are small. Passive balancing at 240 mA handles the moderate cell spread typical of consumer cell lots. The 10x10 mm HTQFP footprint fits dense BMS boards, and the differential daisy-chain allows a stacked monitor architecture without high-voltage-rated isolators, controlling cost in price-sensitive LEV products while -40C to +125C rating covers outdoor riding conditions.
Recommended
Battery Test and Formation Equipment
Battery formation, grading and end-of-line test racks monitor many cells simultaneously and need measurement speed plus channel density. The BQ79656PAPRQ1's sub-200 us full-stack scan enables high-throughput synchronous sampling across channels, improving test-cycle time versus slower multiplexed front ends. Its 6S-16S configurability lets one tester hardware design service multiple module sizes, reducing fixture variants. Integrated shunt current sensing supports in-situ current verification during formation charge/discharge cycles, and the ASIL-D-grade measurement chain gives laboratory-grade channel consistency. The differential daisy-chain scales to long strings of modules in cabinet-level testers while the SPI interface integrates directly with rack controllers. The AEC-Q100 -40C to +125C range also tolerates the elevated ambient temperatures typical of formation rooms without derating the measurement accuracy specifications.
Recommended
Industrial High-Voltage DC Systems
Telecom rectifiers, UPS systems and industrial DC bus systems using 16S lithium strings can use the BQ79656PAPRQ1 as the front-end cell monitor. Its integrated hardware protector provides autonomous undervoltage/overvoltage cutoff support that keeps the string safe during controller faults or firmware updates, a resilience requirement in always-on infrastructure. The sub-200 us scan supports fast transfer decisions in UPS transfer logic, while shunt current sensing feeds power telemetry to the site management system. Differential daisy-chain communication with integrated front-end filters maintains signal integrity across ground-potential differences common in large industrial cabinets, reducing isolation component count versus discrete monitoring. RoHS compliance and the 10x10 mm HTQFP package fit standard industrial PCB processes, and one footprint covering 12S-16S simplifies multi-product platform designs.
Recommended
Recommended Products Summary
Engineering reference data for BQ79656PAPRQ1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BQ79654PAPRQ1 | BQ79652PAPRQ1 | BQ79606-Q1 |
|---|---|---|---|---|
| Package | HTQFP-64 (PAP) 10x10 mm | HTQFP-64 (PAP) 10x10 mm - same | HTQFP-64 (PAP) 10x10 mm - same | 64-pin QFP - same footprint, no current sense (per TI page) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Max Cell Count | 16S | 14S | 12S | 16S |
| Integrated Current Sense | Yes (shunt) | Yes | Yes | No - external current sense required |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
Key Differentiators
- Full 16S cell coverage with integrated current sense (vs BQ79654PAPRQ1)
- Integrated shunt current-sense front end (vs BQ79606-Q1)
- Platform scalability across 12S/14S/16S (vs BQ79652PAPRQ1)
Design Notes
Use the integrated front-end filters exactly as specified in the TI BQ79656-Q1 datasheet daisy-chain application section: low-voltage-rated capacitors/resistors placed directly at the COMH/COML pins, with the differential bus routed as a tightly coupled pair. This allows the stacked daisy chain to cross cell-module boundaries without high-voltage isolation components. Keep cell-input filter components symmetric per channel to preserve measurement matching across all 16 channels, and place balancing current paths away from the cell sense traces to avoid Kelvin-measurement errors.
Estimated: passive balancing at 240 mA per channel across 16 channels represents substantial internal dissipation if many cells balance simultaneously. In a 10x10 mm HTQFP, verify junction temperature against the -40C to +125C rating using your PCB thermal resistance (theta_JA depends heavily on copper pour under the exposed thermal structure). Limit simultaneous balancing duty cycle or stagger balancing across scan cycles if the thermal estimate approaches the rating. Use TI's thermal guidelines for the PAP-64 package when computing the budget.
Configure the device cell count (6S to 16S) to match the physical stack - unused inputs on a 14S or 12S build must be handled per the datasheet configuration guidance, especially when reusing a 16S PCB for family variants. Do not omit the hardware protector wiring: it is the autonomous safety layer behind ASIL-D compliance and must be verified in FMEA. Finally, confirm firmware timing assumes the sub-200 us scan - adding software delays is safe, but assuming slower legacy monitor timing may miss fault-detection windows in your safety analysis.
Compliance Information
RoHS compliance indicated by JLCPCB listing. Automotive Q1 designation and -40C to +125C range per TI product page indicate AEC-Q100 Grade 1 qualification. REACH/halogen/conflict-minerals status not stated in retrieved data.
