Overview
The BQ76940, specifically the BQ7694003DBTR, is a robust analog front-end (AFE) device from Texas Instruments designed for battery pack monitoring and protection. This component is part of the BQ769x0 family, which supports various battery chemistries including Li-ion and Li-iron phosphate. The BQ76940 is tailored for high-power systems, such as light electric vehicles, power tools, and uninterruptible power supplies, and it can manage up to 15-series cells or typical 48-V packs.
Key Specifications
| Parameter | Description |
|---|---|
| Supported Cell Count | Up to 15-series cells |
| Typical Pack Voltage | 48 V |
| Package Type | TSSOP (DBT) - 44 pins |
| Interface | Pure digital interface, I2C compatible with CRC option |
| ADC Resolution | 14-bit for cell voltage, die temperature, and external thermistor; 16-bit for pack current (coulomb counter) |
| Thermistor Support | Directly supports up to three thermistors (103AT) |
| Protection Features | Overcurrent in Discharge (OCD), Short Circuit in Discharge (SCD), Overvoltage (OV), Undervoltage (UV), Secondary protector fault detection |
| Output Voltage Regulator | 2.5-V or 3.3-V output voltage regulator |
| Power Consumption | Low power design with sub-blocks that can be enabled or disabled; SHIP mode for ultra-low power state |
Key Features
- AFE monitoring features with internal ADCs for cell voltage, die temperature, and external thermistor measurements.
- A separate ADC for pack current measurement (coulomb counter).
- Integrated cell balancing FETs and charge/discharge low-side NCH FET drivers.
- Alert interrupt to host microcontroller.
- No EEPROM programming necessary.
- High supply voltage absolute maximum (up to 108 V).
- Random cell connection tolerant.
Applications
The BQ76940 is designed for use in various high-power systems, including:
- Light electric vehicles.
- Power tools.
- Uninterruptible power supplies (UPS).
Q & A
- What is the BQ76940 used for? The BQ76940 is used for battery pack monitoring and protection in high-power systems.
- How many series cells can the BQ76940 support? The BQ76940 can support up to 15-series cells.
- What types of battery chemistries does the BQ76940 support? The BQ76940 supports Li-ion, Li-iron phosphate, and other battery chemistries.
- What interface does the BQ76940 use? The BQ76940 uses a pure digital interface and is I2C compatible with a CRC option.
- What protection features does the BQ76940 have? The BQ76940 includes protection features such as 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 maximum supply voltage for the BQ76940? The maximum supply voltage for the BQ76940 is up to 108 V.
- Can the BQ76940 operate in low power modes? Yes, the BQ76940 has a low power design with sub-blocks that can be enabled or disabled, and it includes a SHIP mode for an ultra-low power state.
- What types of thermistors does the BQ76940 support? The BQ76940 directly supports up to three thermistors (103AT).
- What is the package type of the BQ7694003DBTR? The package type is TSSOP (DBT) with 44 pins.
