9 to 15-series cell li-ion and li-phosphate battery monitor (bq76940 family)
Product details
Parameters
Package | Pins | Size
Features
- AFE monitoring features
- Pure digital interface
- Internal ADC measures cell voltage, die temperature, and external thermistor
- A separate, internal ADC measures pack current (coulomb counter)
- Directly supports up to three thermistors (103AT)
- Hardware protection features
- Overcurrent in Discharge (OCD)
- Short Circuit in Discharge (SCD)
- Overvoltage (OV)
- Undervoltage (UV)
- Secondary protector fault detection
- Additional features
- Integrated cell balancing FETs
- Charge, discharge low-side NCH FET drivers
- Alert interrupt to host microcontroller
- 2.5-V or 3.3-V output voltage regulator
- No EEPROM programming necessary
- High supply voltage absolute maximum (up to 108 V)
- Simple I2C compatible interface (CRC option)
- Random cell connection tolerant
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Description
The bq769x0 family of robust analog front-end (AFE) devices serves as part of a complete pack monitoring and protection solution for next-generation, high-power systems, such as light electric vehicles, power tools, and uninterruptible power supplies. The bq769x0 is designed with low power in mind: Sub-blocks within the IC may be enabled or disabled to control the overall chip current consumption, and a SHIP mode provides a simple way to put the pack into an ultra-low power state.
The bq76920 device supports up to 5-series cells or typical 18-V packs, the bq76930 handles up to 10-series cells or typical 36-V packs, and the bq76940 works for up to 15-series cells or typical 48-V packs. A variety of battery chemistries may be managed with these AFEs, including Lithium Ion, Lithium iron phosphate, and more. Through I2C, a host controller can use the bq769x0 to implement many battery pack management functions, such as monitoring (cell voltages, pack current, pack temperatures), protection (controlling charge/discharge FETs), and balancing. Integrated A/D converters enable a purely digital readout of critical system parameters, with calibration handled in TI’s manufacturing process.
Technical documentation
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
The bq76940EVM is a populated circuit board for evaluation of the bq76940 analog front-end (AFE) along with the bq78350 Battery Management Controller that serves as part of a complete pack monitoring and protection solution for 9 to 15-series Lithium Ion, Lithium iron phosphate, and more battery (...)
Features
- Bq7694000 AFE IC
- Bq78350 Battery Management controller
- FETs for current control
- Test point patterns for easy evaluation
Software development
Reference designs
Design files
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download TIDA-010030 BOM Files.zip (345KB) -
download TIDA-010030 Assembly Files.zip (317KB) -
download TIDA-010030 Layer Plots.zip (1275KB) -
download TIDA-010030 Gerber (Rev. A).zip (1423KB) -
download TIDA-010030 CAD Files (Rev. B).zip (4151KB)
Design files
-
download TIDA-00792 BOM.pdf (70KB) -
download TIDA-00792 Assembly Drawing.pdf (441KB) -
download TIDA-00792 PCB.pdf (2197KB) -
download TIDA-00792 Gerber.zip (845KB) -
download TIDA-00792 CAD Files (Rev. A).zip (1909KB)
Design files
Design files
-
download TIDA-00255 BOM.pdf (114KB) -
download TIDA-00255 Assembly Drawing.pdf (1167KB) -
download TIDA-00255 Fabrication Drawing.pdf (579KB) -
download TIDA-00255 PCB.pdf (5251KB) -
download TIDA-00255 Altium.zip (1865KB) -
download TIDA-00255 Gerber.zip (1058KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
TSSOP (DBT) | 44 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
Support & training
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