High Accuracy Measurement of Battery Parameter Accelerates Electric Mobility Shift

Nuvoton Releases New Series Automotive Battery Monitoring Chipset
Kyoto, Japan, AUGUST 29, 2023 - Nuvoton Technology Corporation Japan (NTCJ) today announced the launch of 4th generation ofbattery monitoring chipset for automotive battery control to measure the voltage and temperature of battery cells and thecurrent of a battery pack with high accuracy.
Achievements:
1. Simplifying an automotive battery system; one IC manages up to 25 in-series battery cells
2. Battery Management System (BMS) compliant to ASIL-D; redundant measurement system*1 and bidirectional ring
communication*2 support its safety
3. Offering safety function; a stand-alone chipset which detects abnormalities during car-parking and starts a hostmicrocontroller
4. Accurate estimation of battery’s State of Charge (SOC*3) and State of Health (SOH*4); ensured by synchronized current andvoltage measurements within 10us.
Product details:
https://www.nuvoton.com/products/battery-management/battery-monitoring-ics/automotive-qualified/index.html
With Electric Vehicle (EV) market growth toward a carbon neutral society realization, automobile manufacturers are encouraged
to meet demands for a safety improvement of a Lithium-ion battery pack, as well as for a longer EV driving range by enhancing
the pack capacity and integration. Furthermore, in order to realize a sustainable society in which mass-produced batteries arereused without being disposed, it is desirable to use batteries for a longer period of time. Not only does BMS secure both highbattery capacity and safety, but it also needs a technology that collects various battery parameters such as battery temperature,charging and discharging current to extend battery life.
NTCJ launches 4th generation of battery monitoring chipset, consisting of a battery monitoring IC that accurately measures thevoltage and temperature of battery cells, a new line of pack monitoring IC that precisely measures a battery pack’s current andmonitors its internal control, and a communication IC that serves as an interface with the ICs above and a microcontroller.
Features:
1. One IC manages up to 25 battery cells in series, simplifying an automotive battery system that generally consists of 100 to200 in-series battery cells
NTCJ’s currently developed battery monitoring IC can measure up to 25 in-series battery cells which is a 25 percent increase in
number compared to the amount of our conventional products. It contributes to the miniaturization and weight reduction of thebattery pack since the BMS with higher-capacity and higher-power can be built with less number of components.
2. Redundancy measurement system and daisy-chain communication make it easier to develop and design a BMS inaccordance with ASIL-D of ISO26262
For higher safety, NTCJ introduces a redundancy measurement system into the circuits of the battery monitoring IC and the packmonitoring IC to measure the battery parameter.
A daisy-chain communication among chipset ICs adopts bidirectional ring communication to ensure continuous communicationin case abnormalities are detected. This redundancy realizes a system with higher robustness, which suppresses communications
disruption in case of failures. This makes it easier for car makers and battery pack manufactures to develop and design
automotive BMS achieving Automotive Safety Integrity Level D (ASIL-D) of ISO26262.
3. Continuous battery monitoring is available in car-parking or microcontroller-in-sleep state to start your system whenabnormalities detected
NTCJ’s 4th generation chipset shifts to a low power consumption mode that regularly permits stand-alone monitoring of battery
status while the microcontroller is in sleep state. In case abnormalities are detected in the temperature or voltage of the battery
cells, the chipset wakes up the microcontroller utilizing the daisy-chain communication to start the BMS.
This function allows to monitor abnormalities of the battery while a car parks or a system sleeps, minimizing system power
consumption of batteries. It contributes to a safer system design of EVs which are adaptable to various use scenarios.
4. Synchronized current and voltage measurement within 10us improves calculation accuracy of internal impedance inbattery cells, resulting in high-accuracy estimation of SOC and SOH
The new chipset automatically synchronizes the voltage of battery cells and the current of the battery pack within 10us tocalculate the electric power and internal impedance of the battery with higher accuracy, enabling the BMS to precisely estimate
2023 © Nuvoton Technology Corporation Japan. All Rights Reserved. | 1 Kotari-yakemachi, Nagaokakyo City, Kyoto, Japan | https://www.nuvoton.co.jp/

SOC and SOH of the battery.
Applications:
Battery Electronic Vehicle (BEV), Hybrid Electric Vehicle (HEV), Energy Storage System (ESS), etc.
Product name:
The 4th generation automotive battery monitoring chipset
Composed of KA84950UA, KA84930UA, KA84917UA, KA84922UA
Specification:
Battery monitoring IC
Product number
Maximum connectable cells
Maximum absolute voltage

KA84950UA

KA84930UA

25 battery cells

20 battery cells
132V

Voltage measurement accuracy+/- 1.5mV

Communication interface
Maximum connectable devices

SPI and daisy
55 devices

Package

QFP-100pin（14mm x 14mm）

Pack monitoring IC
Product number

KA84917UA

Maximum absolute voltage

6V

Voltage measurement accuracy+/- 0.3%

Communication interface

SPI and daisy

General-purpose input output

12 channels

Package

QFP-48pin（7mm x 7mm）

Communication IC
Product number
Maximum absolute voltage

KA84922UA
6V

Transmission speed (SPI)

4Mbps

Communication interface

SPI and daisy (Two of each mounted)

Package

SOP-24pin（4.4mm x 7.8mm）

2023 © Nuvoton Technology Corporation Japan. All Rights Reserved. | 1 Kotari-yakemachi, Nagaokakyo City, Kyoto, Japan | https://www.nuvoton.co.jp/

Typical application:

Mass sales:
Starting from September, 2023
Definitions:*1. Redundancy measurement system: a system which duplicates all circuits including input terminals of battery cells to ensure
the battery parameter continue the measurement in case of failure*2. Bidirectional ring communication: a communication method which secures alternative communication path in case one pathfaces abnormalities*3. State of Charge (SOC): amount of energy available in a battery expressed as a percentage of the battery's fully charged
capacity*4. State of Health (SOH): an indicator of the degree of battery deterioration; representing Capacity State of Health (SOHC) andPower State of Health (SOHR)

2023 © Nuvoton Technology Corporation Japan. All Rights Reserved. | 1 Kotari-yakemachi, Nagaokakyo City, Kyoto, Japan | https://www.nuvoton.co.jp/

About Nuvoton Technology Corporation Japan (NTCJ)
Nuvoton Technology Corporation Japan (NTCJ) joined Nuvoton Group in 2020. As a dedicated global semiconductor manufacturer, NTCJ provides technology and various products
cultivated over 60 years since its establishment, and solutions that optimally combine them. We value relationships with our customers and partners, and by providing added valuethat exceeds expectations, we are working as a global solution company that solves various issues in society, industry, and people's lives. For more information, please visit
https://www.nuvoton.co.jp/en/.

Media contact:

Shigenori, Matsumoto,Management Administration Department, Nuvoton Technology Corporation Japan
NTCJ_PR@nuvoton.com

Technical contact:

Yoshihide Kanakubo,Marketing Department, Battery and Analog Solution Business Group, Nuvoton Technology Corporation Japan
NTCJ_mkt_Battery_Analog@nuvoton.com

2023 © Nuvoton Technology Corporation Japan. All Rights Reserved. | 1 Kotari-yakemachi, Nagaokakyo City, Kyoto, Japan | https://www.nuvoton.co.jp/