Overview
The BQ7694006DBTR, part of the BQ76940 family, is a robust analog front-end (AFE) device designed by Texas Instruments for monitoring and protecting lithium-ion (Li-ion) and lithium-iron phosphate battery packs. This device is tailored for high-power applications such as light electric vehicles, power tools, and uninterruptible power supplies. It supports up to 15-series cells or typical 48-V packs, making it versatile for various battery chemistries.
The BQ76940 family is known for its low power consumption, with features like sub-block enable/disable and a SHIP mode for ultra-low power states. It communicates with a host controller via an I2C interface, enabling comprehensive battery pack management functions including monitoring, protection, and balancing.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Supply Voltage (BAT–VSS) | Maximum voltage at the battery terminal | Up to 108 V |
| Cell Input Differential | Voltage difference between cell inputs | 2 to 5 V |
| Package Type | Package format | 44-TSSOP (DBT) |
| Operating Temperature | Range of operating temperatures | -40 to 85°C |
| Output Voltage Regulator | Output voltage options | 2.5 V or 3.3 V |
| Thermistor Support | Number of thermistors supported | Up to three thermistors (103AT) |
| Cell Balancing Current | Current per cell for balancing | 5 mA |
| I2C Interface | Communication interface with host controller | I2C with CRC option |
Key Features
- AFE Monitoring Features: Pure digital interface with internal ADCs measuring cell voltage, die temperature, and external thermistor.
- Hardware Protection Features: Overcurrent in discharge (OCD), short circuit in discharge (SCD), overvoltage (OV), undervoltage (UV), and secondary protector fault detection.
- Integrated Cell Balancing FETs: For balancing cells within the battery pack.
- Charge and Discharge FET Drivers: Low-side NCH FET drivers for charge and discharge control.
- Alert Interrupt: Alert interrupt to the host microcontroller for critical events.
- Low Power Mode: SHIP mode for ultra-low power states.
- Random Cell Connection Tolerant: The device can handle random cell connections.
Applications
- Light Electric Vehicles: Ideal for battery management in electric scooters, e-bikes, and other light electric vehicles.
- Power Tools: Suitable for high-power battery management in power tools and equipment.
- Uninterruptible Power Supplies (UPS): Used in UPS systems to ensure reliable and efficient battery management.
- Other High-Power Systems: Applicable in various high-power systems requiring robust battery monitoring and protection.
Q & A
- What is the maximum number of series cells supported by the BQ7694006DBTR?
The BQ7694006DBTR supports up to 15-series cells.
- What types of battery chemistries can be managed by the BQ76940 family?
The BQ76940 family can manage Li-ion, Li-iron phosphate, and other battery chemistries.
- How does the BQ76940 communicate with the host controller?
The BQ76940 communicates with the host controller via an I2C interface.
- What are the key hardware protection features of the BQ76940?
The key hardware protection features include overcurrent in discharge (OCD), short circuit in discharge (SCD), overvoltage (OV), undervoltage (UV), and secondary protector fault detection.
- Does the BQ76940 require EEPROM programming?
No, the BQ76940 does not require EEPROM programming.
- What is the purpose of the SHIP mode in the BQ76940?
The SHIP mode puts the pack into an ultra-low power state to conserve energy.
- How many thermistors can the BQ76940 support?
The BQ76940 can support up to three thermistors (103AT).
- What is the output voltage range of the built-in voltage regulator?
The output voltage regulator can provide 2.5 V or 3.3 V.
- What is the operating temperature range of the BQ7694006DBTR?
The operating temperature range is -40 to 85°C.
- What package type is the BQ7694006DBTR available in?
The BQ7694006DBTR is available in a 44-TSSOP (DBT) package.
