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Texas Instruments BQ78350DBTR-R1
- Part No.:
- BQ78350DBTR-R1
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 30-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ78350DBTR-R1.pdf
- Description:
- IC BATT MON MULTI 3-15C 30TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,026
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Product details
Overview
BQ78350DBTR-R1 from Texas Instruments is a Li-ion and LiFePO₄ battery management controller and fuel gauge companion to the bq769x0 analog front-end (AFE), providing CEDV-based state-of-charge estimation, SMBus 1.1 host interface, programmable protection (voltage/current/temperature), lifetime data logging, and SHA-1 authentication for 3–15-series battery packs up to 320 Ah in e-bikes and power tools.
For engineers reviewing the BQ78350DBTR-R1 datasheet, BQ78350DBTR-R1 pinout, BQ78350DBTR-R1 application, or BQ78350DBTR-R1 equivalent, key selection considerations include its 30-pin TSSOP package, dual-oscillator architecture (4.194 MHz + 32.768 kHz), 16-bit ADC with 13–14-bit effective resolution, SMBus slave address configurability via SMBA, and integration with external AFE for cell voltage, current, and thermistor monitoring.
Technical Context
The BQ78350DBTR-R1 operates as a system-level BMS controller-not a standalone AFE-relying on digital communication (SDA/SCL) with companion bq76920/bq76930/bq76940 devices for raw cell voltage, current, and temperature acquisition. Its internal CoolRISC CPU executes CEDV fuel gauging, protection logic, and data logging using firmware stored in program memory and backed by 20,000-cycle data flash.
It implements three power modes (NORMAL, SLEEP, SHUTDOWN) with supply currents ranging from 0.1 µA (SHUTDOWN) to 650 µA (NORMAL), and uses VEN-controlled external voltage translation at the BAT pin to minimize quiescent power during cell voltage measurement. Protection decisions are executed in real time with configurable thresholds and independent charge/discharge overtemperature alarms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.4 V to 2.6 V - tight regulation required; operation outside this range invalidates all electrical specs |
| Operating Temperature | –40°C to +85°C - supports industrial and outdoor battery applications including e-scooters and UPS systems |
| ADC Resolution | 16-bit with 13–14-bit effective resolution - enables precise coulomb counting and voltage scaling for large-capacity cells |
| SMBus Frequency | 10–100 kHz - compatible with standard SMBus 1.1 master controllers; supports PEC for error detection |
| Data Retention | 10 years - non-volatile flash stores lifetime diagnostics (cycle count, max/min temp/voltage, safety events) |
| Flash Endurance | 20,000 write cycles - sufficient for field firmware updates and long-term parameter calibration storage |
| Oscillators | 4.194 MHz (HFO) ±3% and 32.768 kHz (LFO) ±2.5% - provides timing for real-time clock, protection sampling, and low-power wake-up |
Pinout & Package
Package: 30-pin TSSOP (DBT), 7.80 mm × 6.40 mm body size, lead pitch 0.5 mm, exposed thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM | Open-drain LCD common | Drives shared cathode/anode for multiplexed LCD segments; leave unconnected if LED-only display used |
| ALERT | AFE interrupt input | Active-low signal from bq769x0 indicating fault condition (e.g., cell OV/UV, OC); triggers immediate BQ78350DBTR-R1 response |
| SDA / SCL | AFE I²C interface | Bi-directional data/clock lines to bq769x0 AFE; require 10-kΩ pull-ups to VCC for proper level translation |
| PRECHG | Precharge FET control | Open-drain output with programmable polarity; drives gate of precharge MOSFET during 0-V battery recovery |
| VAUX / BAT | Analog inputs | VAUX: auxiliary voltage sensing; BAT: translated pack voltage for fuel gauge algorithm (controlled by VEN pin) |
| SMBD / SMBC | SMBus interface | Open-drain bidirectional data/clock; support slave-only SMBus 1.1 with PEC; SMBA pin sets slave address |
| SAFE | Secondary safety output | Active-high signal to blow fuse or disable charging path upon critical fault (e.g., safety OV/UV, FET fault) |
| LED1–LED5 | Display segment drivers | Five open-drain outputs supporting 5-segment LED bar or LCD segments; firmware-configurable for SoC indication |
| GPIOA / GPIOB | Configurable I/O | General-purpose pins usable as inputs (e.g., key-switch sense) or outputs (e.g., status indicators); tie to VSS if unused |
| MRST | Master reset input | Active-low hardware reset; must be held high for normal operation; asynchronous to internal clock domains |
Key Features
| Feature | Design Value |
|---|---|
| CEDV Fuel Gauging | Compensates discharge voltage for temperature and SoC to deliver accurate remaining capacity estimation across aging and load conditions |
| Programmable Protection | Independent charge/discharge overcurrent, overtemperature, and cell voltage thresholds with configurable delay and latch behavior |
| Lifetime Data Logging | Records 12 most common safety events plus cycle count, min/max voltage per cell, and min/max temperature for warranty analysis |
| SHA-1 Authentication | Enables secure host verification of battery authenticity and prevents unauthorized pack replacement or firmware tampering |
| Voltage Translation Control | VEN pin enables/disables external BAT voltage divider to reduce quiescent current during idle periods without sacrificing accuracy |
Applications
| e-Bikes & Pedelecs | Power Tools |
|---|---|
|
Use Scenario: 10S–13S Li-ion battery pack powering mid-drive motor with regenerative braking and pedal-assist torque sensing. IC Role / Device Role / Timing Role: BQ78350DBTR-R1 acts as primary fuel gauge and protection coordinator, communicating with bq76940 AFE to monitor cell voltages, pack current, and NTC temperatures every second. Use Value: Enables precise state-of-charge reporting under dynamic load, prevents over-discharge during hill climbs, and logs lifetime cycle data for predictive maintenance. |
Use Scenario: 12S Li-ion pack in cordless drill with high-pulse discharge (up to 320 A) and rapid charge cycles. IC Role / Device Role / Timing Role: BQ78350DBTR-R1 manages CC-CV charging, precharge for deeply discharged cells, and real-time overcurrent protection using integrated coulomb counter and AFE-reported current. Use Value: Supports safe fast-charging while preventing thermal runaway during burst loads, and retains diagnostic history for end-of-life analysis. |
| UPS & Telecom Backup | Robot Vacuums |
|
Use Scenario: 8S LiFePO₄ battery in 48 V telecom backup system requiring >10-year service life and remote health monitoring. IC Role / Device Role / Timing Role: BQ78350DBTR-R1 performs long-term SoH tracking via CEDV model drift, stores lifetime min/max voltage/temperature, and reports metrics over SMBus to central BMS. Use Value: Extends usable battery life through adaptive gauging and enables predictive replacement before failure, reducing site visits. |
Use Scenario: 4S Li-ion pack in autonomous vacuum with space-constrained layout and frequent partial charge cycles. IC Role / Device Role / Timing Role: BQ78350DBTR-R1 drives 5-segment LED SoC indicator, monitors battery temperature via external NTC, and enforces charge suspend when hot. Use Value: Provides intuitive user feedback without MCU overhead, maintains safety during docking/charging, and minimizes standby current via SLEEP mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery management controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| bq78350-R1EVM | Evaluation module with preloaded firmware, onboard bq76940 AFE, and USB-SMBus bridge - not a direct replacement IC | Used for prototyping and validation only; lacks production-grade packaging and qualification | Select only for development; requires separate BQ78350DBTR-R1 for volume deployment |
| bq76952 | Integrated AFE + MCU in single chip; includes built-in 16-bit ADC, 32-bit RISC-V core, and enhanced protection features | Eliminates need for companion AFE; supports up to 16-series cells and higher current sensing resolution | Choose for new designs seeking reduced BOM count and higher integration; not pin-compatible with BQ78350DBTR-R1 |
Compared with BQ78350DBTR-R1, the bq76952 offers monolithic integration and extended cell count, while the bq78350-R1EVM serves strictly as a debug platform - neither provides drop-in replacement capability, and both require PCB redesign and firmware adaptation.
Availability
BQ78350DBTR-R1 is available at Aetrix Electronics and suitable for light electric vehicles, cordless power tools, and telecom backup systems requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial battery packs.
Supply support for BQ78350DBTR-R1 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 experience in battery safety and precision measurement ICs.
The BQ78350DBTR-R1 belongs to TI's battery management controller product line, designed specifically to complement the bq769x0 AFE family for scalable, high-accuracy Li-ion and LiFePO₄ pack monitoring in cost-sensitive, high-reliability applications.
FAQ
What is the primary function of the BQ78350DBTR-R1 in a battery management system?
The BQ78350DBTR-R1 serves as a dedicated battery management controller and fuel gauge that works exclusively with TI's bq769x0 AFE family. It executes CEDV-based state-of-charge calculation, runs protection algorithms (voltage/current/temperature), logs lifetime diagnostics, and communicates results over SMBus 1.1. It does not measure cell voltages or current directly - those functions reside in the companion AFE.
Does the BQ78350DBTR-R1 support standalone operation without an external AFE?
No, the BQ78350DBTR-R1 cannot operate standalone. It relies on digital communication via SDA/SCL pins with a bq76920, bq76930, or bq76940 AFE to acquire cell voltage, current, and temperature data. The BQ78350DBTR-R1 contains no analog front-end circuitry - its ADC inputs (BAT, VAUX) are for auxiliary measurements only, not cell-level monitoring.
How is the SMBus slave address configured on the BQ78350DBTR-R1?
The SMBus slave address of the BQ78350DBTR-R1 is set by applying a voltage to the SMBA pin (Pin 30) using a resistor divider. Eight unique addresses are supported by selecting one of eight voltage thresholds. ADREN (Pin 29) can disable the divider after power-on to reduce leakage current. Address configuration occurs at POR or system-present detection - not dynamically during runtime.
What protection features does the BQ78350DBTR-R1 provide, and how are they implemented?
The BQ78350DBTR-R1 implements two-tier protection: primary (cell OV/UV, charge/discharge OC, short-circuit, OT/UT) and secondary (safety OV/UV, safety OC, FET faults, imbalance). Primary protections trigger ALERT and control CHG/DSG FETs via AFE commands; secondary protections assert the SAFE pin to blow a fuse. All thresholds and delays are fully programmable via SMBus registers.
Can the BQ78350DBTR-R1 drive an LCD display, and what are the requirements?
Yes, the BQ78350DBTR-R1 supports multiplexed LCD displays via the COM pin and LED1–LED5 outputs. When LCD mode is enabled in firmware, COM becomes the common electrode driver and LED1–LED5 serve as segment drivers. External bias circuitry (typically resistive or capacitive) is required, and the display must be compatible with the device's 32.768 kHz LFO timing reference for stable contrast.
BQ78350DBTR-R1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 30-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Battery Monitor
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 3 ~ 15
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage
- Interface:
- SMBus
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 30-TSSOP
BQ78350DBTR-R1 FAQ
1.How can I place an order for BQ78350DBTR-R1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ78350DBTR-R1 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 BQ78350DBTR-R1 reliable?
The price and inventory of BQ78350DBTR-R1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ78350DBTR-R1 is usually 5 days.
3.What payment methods are accepted for BQ78350DBTR-R1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ78350DBTR-R1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ78350DBTR-R1?
BQ78350DBTR-R1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ78350DBTR-R1 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 BQ78350DBTR-R1?
For technical support, including BQ78350DBTR-R1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ78350DBTR-R1 requirements.
6.How does Aetrix verify that BQ78350DBTR-R1 is sourced from the original manufacturer or authorized distributors?
All BQ78350DBTR-R1 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 BQ78350DBTR-R1 meets industry standards.
7.What is the process for return or replacement of BQ78350DBTR-R1?
All BQ78350DBTR-R1 units undergo pre-shipment inspection (PSI). If there is an issue with BQ78350DBTR-R1, 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 BQ78350DBTR-R1 part is unused and in its original packaging.
Return procedure for BQ78350DBTR-R1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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