Product description
Battery monitoring IC for multi-cell Li-ion systems
The KA49702A is positioned as a battery monitoring IC for multi-cell lithium-ion battery systems. Based on the provided sources, the device is designed for applications with up to 17 cells connected in series and for battery voltages up to the 85 V range. This makes it suitable for compact battery monitoring and protection circuitry in industrial energy systems.
Precise voltage and current acquisition at IC level
The IC integrates a 14-bit voltage ADC for cell voltage monitoring together with 16-bit current measurement and a coulomb counter. It also provides analog inputs for thermistor-based temperature monitoring. This architecture supports BMS designs that require continuous tracking of cell condition, pack condition, and thermal behavior.
Built for protection and status monitoring
Supported functions include overvoltage and undervoltage monitoring, overcurrent and short-circuit detection, and temperature-related monitoring. Through alarm pins and the SPI interface, status information can be reported to a microcontroller. The provided sources also mention support for external cell balancing and FET-related protection logic.
Interfaces and integration into BMS topologies
For system integration, the IC offers an SPI interface with CRC and watchdog timer, multiple GPIOs, dedicated TMONI inputs, and measurement inputs for cells and current sensing. This makes the device suitable for BMS architectures that combine measurement acquisition, protection response, and host communication in a compact monitoring IC.
Suitable for industrial battery applications
The provided materials list application examples such as e-bike, UPS, server backup systems, power tools, and energy storage systems. This positions the IC for battery monitoring tasks in systems where multiple Li-ion cells need to be monitored safely and connected to higher-level energy management electronics.
For project inquiries and technical coordination, please use the Contact Form, phone 089 895050, or store-ate@atxx.de.
Application Areas
- Battery management systems for multi-cell lithium-ion battery packs.
- E-bike and pedelec batteries with serial cell monitoring.
- UPS and server backup systems with precise cell and current supervision.
- Power tools with integrated protection and monitoring concepts.
- Energy storage systems with cell voltage, current, and temperature monitoring.
- Industrial BMS designs with SPI connection to a host microcontroller.
Technical Specifications
- Manufacturer: Nuvoton
- Product: KA49702A
- MPN: KA49702A
- Product type: Battery monitoring IC
- Category: Non Stackable
- Cell count: up to 17 battery cells in series
- Maximum battery voltage: 85 V
- Recommended operating range VVBAT: 12.5 V to 85 V
- Voltage ADC: 14-bit for cell voltage monitoring
- Current measurement: 16-bit low-speed current measurement ADC, coulomb counter
- Current sensing principle: low-side sense resistor current measurement and monitoring
- Cell voltage resolution: typ. 0.3 mV
- Cell voltage accuracy: up to ±3 mV at ΔCn = 2.0 V to 4.3 V, ADV_AVE = 10
- Analog temperature inputs: 5 channels for thermistor measurement
- SPI: up to 1 MHz, with CRC code correction and watchdog timer
- Alarm functions: overvoltage, undervoltage, overcurrent, short circuit
- Temperature monitoring: OT / UT monitoring, thermal shutdown
- GPIO: 4 general GPIO interrupt signals
- FET control: CHG, DIS, and FETOFF control
- Fuse driver: integrated, for secondary protection functions
- REGEXT: selectable 3.3 V / Hi-z, up to 50 mA
- VDD50 output: 4.75 V to 5.25 V
- VDD15 output: typ. 1.50 V
- Operating modes: active, standby / low power, sleep, shutdown
- Supply current: typ. 160 µA active, 60 µA low power, 13 µA sleep, 0 to 1 µA shutdown
- Current monitor range SRP/SRN: -180 mV to 180 mV
- Wake-up signal: VPC
- Package: TQFP 48 / HQFP 48L, 7 x 7 x 1 mm, lead pitch 0.5 mm
- Operating temperature: -40 °C to 105 °C
- Junction temperature: up to 125 °C
- Storage temperature: -55 °C to 125 °C
- Application examples: pedelec, e-bike, UPS, server backup system, power tool, energy storage systems
FAQ
FAQ
How many Li-ion cells can the IC support?
The IC supports up to 17 battery cells connected in series.
Which communication interface is available?
The device provides an SPI interface with up to 1 MHz, plus CRC and a watchdog timer.
Which measurement functions are integrated?
It integrates 14-bit cell voltage monitoring, 16-bit current measurement with a coulomb counter, and 5 analog thermistor inputs.
Which protection functions does the IC support?
Supported functions include overvoltage, undervoltage, overcurrent, short circuit, together with temperature monitoring and alarm outputs.
Does the device support external cell balancing?
Yes. The provided materials mention support for external cell balancing.
What kinds of applications is the device suited for?
Listed use cases include e-bike, pedelec, UPS, server backup systems, power tools, and energy storage systems.
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