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Nuvoton’s battery-monitoring ICs help an electric-vehicle battery-management system (BMS) measure cell voltage and temperature, as well as pack current. They are components in the battery-monitoring layer—not a complete battery pack or a system that independently drives EV adoption. Nuvoton’s 2023 fourth-generation chipset announcement describes separate cell-monitoring, pack-monitoring, and communication ICs, while its current automotive listing also features a distinct 26-cell device.
What does a battery-monitoring IC do in an EV?
An EV traction battery contains many cells connected in series. A BMS uses measurements from those cells and the battery pack to manage battery operation. A battery-monitoring IC supplies part of that information: Nuvoton describes its chipset as measuring individual cell voltage and temperature, along with pack current, for use by the BMS.
Those readings inform estimates such as remaining capacity, driving range, state of charge (SOC), and state of health (SOH). Nuvoton’s introduction material calls the monitoring chipset a key BMS-control component and says measurement accuracy affects these estimates. The ICs provide measurements; they are not the whole BMS or the battery itself.
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In its August 29, 2023 announcement, Nuvoton described a set of separate devices that work together and interface with a microcontroller:
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- 🔋High Value Battery Tester: BM200 is your go-to solution for 12V lead-acid and lithium battery. Equipped with advanced features like voltage & cranking & charging system test, abnormal alarm and real-time trip records.This battery monitor ensures your car battery is always in optimal condition. Whether it's for your car, motorcycle, truck, RV or boat, this 12V battery tester has got you covered. Get it, and forget winter breakdown worries.
- 🚗Keep Your Journey Smooth: Ever lose your car in a crowded parking lot? Not anymore! From real-time battery monitoring and smart alerts to multi-vehicle management and location tracking, the BM200 12v battery tester isn't just a battery tester—it’s your all-in-one vehicle management companion. Perfect for drivers who want to avoid battery surprises and keep their vehicles running smoothly every day. Note: Seek car function requires GPS permissions to be authorized for the device to identify the vehicle's location.
- 🎄Cranking & Charging System: The cranking test helps you assess the battery's performance during vehicle startup, while the charging test lets you evaluate the operational efficiency between the battery, alternator, and electrical system——keeping your vehicle running smoothly without any surprises. With reliable accuracy, the BM200 car battery tester gives you the info you need to stay ahead, no matter the conditions.
- ✌️Effortless Battery Testers: Enjoy hassle-free battery monitoring with Bluetooth 4.2 technology. No need to stand by your car's hood—sit back in your car or within a 15~30FT range to access real-time battery information. Whether it's hot, cold, or rainy, you can conveniently monitor your battery's condition. Plus, the enhanced Bluetooth connection provides faster pairing and a stable, reliable connection.
- 📈Accurate Data, Every Time: With this battery checker tester smart chip tech, you’ll get razor-sharp accuracy every time you check your battery health. Compatible with both iOS and Android, the ancel BM200 battery tester app lets you monitor up to 4 devices all at once—keeping you effortlessly connected. Additionaly, this saves the day by recording battery data every 2 minutes and stashing 70 days' worth of history, so you can always track back and see what's up with your power. It is recommended to install the device after the vehicle has been switched off for two hours, when the voltage will be stable and the data will be more stable.
| Device | Role described by Nuvoton | Cell capacity or other detail |
|---|---|---|
| KA84950UA | Cell battery-monitoring IC | Up to 25 series-connected cells |
| KA84930UA | Cell battery-monitoring IC | Up to 20 cells |
| KA84917UA | Pack-monitoring IC | Pack monitoring |
| KA84922UA | Communication IC | Interfaces with the monitoring devices and microcontroller |
The KA84950UA product page specifies ±1.5 mV voltage accuracy, an 11–125 V operating range, a QFP-100 package, an SPI/daisy interface, and an operating temperature range of −40 to +125 °C. Nuvoton says it is suitable for vehicle battery systems connecting 100 to 200 cells in series; this system-level suitability statement does not change the IC’s stated limit of up to 25 cells.
How many cells can the KA84950UA monitor?
Nuvoton specifies that the KA84950UA monitors up to 25 series-connected cells. This is the per-device cell-monitoring capacity, not a claim that a single KA84950UA directly monitors an entire 100-to-200-cell vehicle battery. Nuvoton describes the IC as suitable for battery systems in that larger series-cell range, where a system design uses the required components and architecture.
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- APPLICATION --- The battery testers can be used for testing battery voltage and capacity for electric motorcycle, motorcycle，golf cart, automotive , car, marine, RV, boat, etc.
- APPLICABLE BATTERY --- The digital battery monitor is suitable for 7-100V (12v 24v 36v 48v 60v 72v 84v) Ternary lithium battery, lead-acid,AGM battery, LiFePO4 battery. Default 12 volt lead acid battery .
- PROTECTION ---The smart battery monitor with fully colsed protective shell, dustproof ,IPX7 Waterproof ,It can be used for indoor and outdoor. Even if you soak in water for 72 hours, it will not get water.Input reverse connection protection.
- INSTALLATION --- The red wire for the positive and the black wire for the negative. The wires length are 23.62 inches(60.0cm),we provide mounting bracket,double-side adhensinve and screw for conventient installing.
- Buzzer Alarm&Temperature--- The battery monitor can set low and high voltage buzzer alarm and short press"M"key can switch voltage and temperature（Celsius).
What features does Nuvoton say support BMS design?
Redundant measurement and daisy-chain communication
Nuvoton says redundant measurement and daisy-chain communication are intended to make it easier to develop an automotive BMS in accordance with ISO 26262 ASIL-D. This is a manufacturer design-support claim, not evidence that every system using the chipset complies with the standard or that a complete vehicle battery system has been certified.
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Nuvoton says the chipset can continue monitoring the battery while the vehicle is parked or the host microcontroller is asleep, and wake the host if it detects abnormal cell voltage or temperature. That describes a feature of the manufacturer’s design; it is not an independent assessment of battery safety.
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- It compatible with all 12-volt vehicle batteries;Voltage: 9-16V With Bluetooth 4.0; Supports Solar Power Systems/RVs/Motorcycles/Boats/Cars/Trucks with All 12 Volts.
- Automatic LowVolt Alarm: Alert user if battery is LowVolt when enters Bluetooth range in 10 meters.
- Safe and Reliable: Battery load tester tells you everything about the battery: voltage, charge,cranking power, Engine starting detect automatically, etc.
- Free app for both iOS & Android, IOS: IOS 7.1 and Later Available: Android 4.3 and Later
- Easy to Operate: Battery Monitor’s App is Battery Monitor BM2. Please scan machine backup or user manual scan code to download software. Connecting Bluetooth and open app, no code, you can know battery or battery load’s Condition and check charging and starting system, list time of each driving.
Synchronized voltage and current measurements
Nuvoton says the chipset synchronizes cell-voltage and pack-current measurements within 10 μs. The company says this helps calculate internal impedance and supports more accurate SOC and SOH estimates. The figure and performance explanation are manufacturer claims, not results from an independent test.
Does Nuvoton’s battery chipset make an EV battery safer?
Battery monitoring can provide a BMS with information it needs to respond to cell or pack conditions. Nuvoton specifically describes redundant measurement, daisy-chain communication, parked monitoring, and host wake-up as design features. Those features may support a safety-oriented BMS design, but the chipset alone does not establish that a finished battery or vehicle is safe, nor does the announcement independently verify system-level safety or ISO 26262 compliance.
Rank #4
- 6V, 12V & 24V MONITORING - View voltage, estimated state of charge and temperature through the ANCEL BM300 Pro app. On supported 12V and 24V vehicle systems, review cranking and charging voltage tests. For 6V systems, use voltage, SOC and temperature monitoring; cranking and charging tests are not supported.
- MONITOR UP TO 4 BATTERIES - Each BM300 Pro connects to one battery. Add up to four BM300 Pro devices in the app to view four batteries from one phone, useful for multiple vehicles or separate battery banks. This package includes one monitor; additional batteries require additional monitors
- BLUETOOTH 5.3, NOT REMOTE CELLULAR - View live data and receive supported alerts when your phone is within Bluetooth range. The monitor stores up to 72 days of history while disconnected and syncs data when you reconnect. It does not provide Wi-Fi, cellular, or unlimited-distance monitoring
- APP DATA FOR BETTER CONTEXT - Review voltage, estimated SOC, temperature, cranking and charging results, trip records, and historical graphs. Trip and Find Car features use the phone’s location services and require permission; the monitor itself does not contain a GPS or cellular tracker
- MADE FOR LONG-TERM INSTALLATION - Average current draw is approximately 1mA. Built-in reverse-polarity and short-circuit protection support permanent installation, while the IP67-rated housing is designed for engine-bay conditions. For the best signal, mount away from thick metal obstructions and secure both terminal leads
How does the current KA85010UA listing differ?
Nuvoton’s current automotive product listing features the KA85010UA, described as a 26-cell, EIS-enabled battery-monitoring IC for EVs and energy-storage systems. The listing gives ±2.0 mV voltage accuracy at end of line and describes the device as “ISO 26262 ASIL-D Ready” and AEC-Q100 qualified. It is a distinct listed product, not one of the four devices named in the 2023 fourth-generation KA84950UA-family announcement.
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| Product context | Cell capacity | Voltage accuracy | Other listed detail |
|---|---|---|---|
| KA84950UA, fourth-generation family announcement | Up to 25 series-connected cells | ±1.5 mV | SPI/daisy interface; 11–125 V operating range; −40 to +125 °C; QFP-100 |
| KA85010UA, current automotive listing | 26 cells | ±2.0 mV at end of line | EIS-enabled; listed as “ISO 26262 ASIL-D Ready” and AEC-Q100 qualified |
The figures come from different Nuvoton product contexts and are not a like-for-like independent comparison. The KA85010UA listing does not establish the same interface, operating ranges, package, or full system behavior as the KA84950UA product page.
Best Value
- It compatible with all 12-volt vehicle Lead acid batteries;Voltage: 9-16V With Bluetooth 4.0; Supports Solar Power Systems/RVs/Motorcycles/Boats/Cars/Trucks with All 12 Volts.
- Automatic LowVolt Alarm: Alert user if battery is LowVolt when enters Bluetooth range in 10 meters.
- Safe and Reliable: Battery load tester tells you everything about the battery: voltage, charge,cranking power, Engine starting detect automatically, etc.
- Free app for both iOS & Android, IOS: IOS 7.1 and Later Available: Android 4.3 and Later
- Easy to Operate: Battery Monitor’s App is Battery Monitor BM2. Please scan machine backup or user manual scan code to download software. Connecting Bluetooth and open app, no code, you can know battery or battery load’s Condition and check charging and starting system, list time of each driving.
What engineering resources does Nuvoton list?
Nuvoton lists evaluation boards KE-KA84950UA, KE-KA84917UA, and KE-KA84922UA. Its automotive resource page says the boards include cables and software for microcontroller control to support performance verification and initial evaluation, and describes the KE-KA84950UA board as capable of measuring up to 25 cells. Nuvoton advises contacting the company first. These are engineering evaluation resources, not evidence of a consumer retail purchase route or a plug-in EV accessory.
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