Product description
Battery monitoring IC for multi-cell Li-ion systems
The KA49701A is designed as a battery monitoring IC for multi-cell lithium-ion battery systems. The device supports up to 17 cells connected in series and is intended for battery systems with voltages up to 85 V. 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 low-speed current measurement and a coulomb counter. It also provides 5 analog inputs for thermistor-based temperature monitoring. This architecture supports BMS designs that require continuous tracking of cell condition, pack status, and thermal behaviour.
Built for protection and status monitoring
Core 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 IC also supports external cell balancing, low-side N-MOSFET control for CHG and DIS, and an integrated fuse driver for secondary protection.
Interfaces and integration into BMS topologies
For system integration, the IC provides an SPI interface up to 1 MHz with CRC and watchdog timer, 4 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
Target applications include pedelec, e-bike, UPS, server backup systems, power tools, and energy storage systems. The IC is therefore well suited to battery monitoring tasks where multiple Li-ion cells must be supervised safely and integrated into 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.
Technische Spezifikationen
- Manufacturer: Nuvoton
- Product: KA49701A
- MPN: KA49701A
- Product type: Battery monitoring IC
- Category: Non Stackable
- Cell count: up to 17 battery cells in series
- Maximum battery voltage: 85 V
- Supply voltage VVBAT: 12.5 V to 85 V
- VREGEXT: 2.3 V to 5.5 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: ±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: low-side N-MOSFET control for CHG, DIS, and FETOFF
- 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
- Current consumption: typ. 160 µA active, 60 µA low power, 13 µA sleep, 0 to 1 µA shutdown
- SRP/SRN measurement range: -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
- Package power dissipation: 1.34 W at Ta = 25 °C, 0.268 W at Ta = 105 °C
- Operating temperature: -40 °C to 105 °C
- Junction temperature: up to 125 °C
- Storage temperature: -55 °C to 125 °C
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 IC supports external cell balancing with external MOSFET control.
What kinds of applications is the device suited for?
Listed use cases include pedelec, e-bike, UPS, server backup systems, power tools, and energy storage systems.
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