November 24th, 2021
Media Contact:
Management Administration Department
Nuvoton Technology Corporation Japan
NTCJ_PR@nuvoton.com

Launch of New Generation Battery Monitoring ICs for Automotive
Kyoto, Japan – Nuvoton Technology Corporation
Japan (NTCJ) today announced 3rdgeneration

enhanced functional safety battery monitoring ICs(BM-ICs) for automotive battery management system

Accelerate the electrificationof automobiles toward carbon
neutrality.

(BMS).
Benefit
1. Enhanced redundancy measurement system and communication function tofacilitate development and design of BMS compliant with ASIL-D of in-vehicle
functional safety standard (ISO26262).
2. Achieved high-precision measurement with a voltage measurement error of 1.5mV (our conventional product is at 2.5 mV) and realized BMS compatible withvarious types of battery cells and applications.
3. Simplify in-vehicle battery system connecting 100 to 200 battery cells in series bymeasuring up to 20 series-connected battery cells with one IC, which is thehighest level in the industry.
/ Please check here for details:
https://www.nuvoton.com/products/battery-management/battery-monitoringics/automotive-qualified
Battery electric vehicles (BEVs) and hybrid electric vehicles (HEVs) are becoming more
and more popular to achieve carbon neutrality worldwide. Automakers are encouraged
to ensure safety against hazardous events such as lithium-ion batteries catching fire andemitting fumes. The cruising range per charge of BEVs must be extended equivalent toa single fueling of internal combustion engine vehicle. Lithium-ion batteries have various
battery chemistries such as NMC[1], LiFePO4[2], and LTO[3], depending on thematerials used for the positive electrode and negative electrode. A battery monitoring IC
can measure a wider voltage in wide temperatures is required to select the optimum
battery according to the application for considering of energy efficiency, safety and cost.

Automakers are required to install a large-capacity, high-output lithium-ion battery in asmall space of BEVs and HEVs.
Our new BM-ICs can detect a wide range of battery cell abnormalities and BMS failureswith a redundant measurement system consisting duplicates of the battery cell input
terminal, multiplexer, and AD converter in a single IC. It is equipped with a daisy
communication function that is more robust than conventional products. This will enable
automakers and battery module manufacturers to easily develop and design battery
systems that comply with ISO26262 ASIL-D requirements. The new devices with a highprecision voltage measurement error of 1.5 mV, help to extend the cruising range ofBEVs, and support wide input voltage range thereby maximizes the performance oflithium-ion batteries; and enable to deploy a common platform for various vehicle modelsand applications. In addition, the new products measure up to 20 connected battery cells
in series, which have been well-established from the previous generation. As a result,
BMS can be configured with smaller number of components for a high-voltage battery
system with many battery cells connected in series, contributing to the miniaturization of
the battery module.
Technological Features:
1. The elements and functional blocks are electrically separated by utilizing thecharacteristics of the well-established proprietary SOI process. This separates
the measurement terminals of the battery cell into two systems. The enhanced
measurement system enables failure detection of the input filter composed ofexternal parts. The bidirectional daisy communication enables the configurationof a robust communication topology with higher redundancy.
2. The new ICs have the industry's highest level of absolute voltage measurement
accuracy due to implementing a high-precision reference circuit and adjusting thetemperature fluctuation characteristics at the time of shipping inspection. The
new products achieve high measurement over wide voltage ranges andtemperatures by circuit technology that suppresses leakage current and corrects
minute deviations in voltage accuracy at high temperatures.
3. The new devices have high withstand voltage at a maximum rated voltage 144V
with integrated functions by fine process, and a highly safe redundant design thatare advantage of SOI process technologies.
Applications
Battery electric vehicles (BEVs), hybrid electric vehicles (HEV), large-capacity energy
storage systems (ESS), etc.
Part Number
3rd generation battery monitoring ICs (KA84933 series) for automotive
KA84933UA / KA84923UA / KA84939UA

Definition of Terms[1] NMC (Lithium nickel manganese cobalt oxide):
Batteries that use NMC (a compound that consists of Nickel, Manganese, and Cobalt)
for the positive electrode with a low calorific value, excellent discharge characteristics at
low temperatures, and a high energy density, used in medical equipment and electricvehicles.
[2] LiFePO4 (lithium iron phosphate):
Batteries that use phosphoric acid for the positive electrode. It is highly safe because
thermal runaway rarely happens, and the raw material cost is relatively low. It is used inelectric tools and electric vehicles.
[3] LTO (lithium-titanate-oxide):
Batteries that use LTO instead of graphite for the negative electrode material. Thevoltage is low and the capacity is small, but the thermal stability is high and the cycle
characteristics are appropriate.
[4] SOI (Silicon on Insulator) process:The elements are separated by an insulator (SiO2 layer). The electrical separation
between the elements is separated by a PN junction in conventional process.
Press contact:
Shigenori Matsumoto,Management Administration Department, Nuvoton Technology Corporation Japan
NTCJ_PR@nuvoton.com
Technical contact:
Yoshihide Kanakubo, Director
Marketing Department, Battery and Analog Solution Business Group,
Nuvoton Technology Corporation Japan
NTCJ_mkt_Battery_Analog@nuvoton.com
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, as well as spatial sensing
solutions and battery application solutions that optimally combine them. We value
relationships with our customers and partners, and by providing added value thatexceeds 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/.