Kyoto – September 29, 2026 -- Nuvoton Technology Corporation Japan (NTCJ) will begin sampling its KA85010UA battery monitoring IC in January 2027, a 26-cell chip that integrates electrochemical impedance spectroscopy (EIS) directly on-chip while cutting PCB temperature rise during measurements by approximately 93% compared with conventional methods.
Inductor-based design slashes power loss and heat by 93%
The KA85010UA replaces the industry-standard resistor method with NTCJ's proprietary inductor approach for EIS measurement, reducing both energy loss and PCB temperature rise by roughly 93%, according to company evaluations. The lower thermal footprint allows EIS functionality to be embedded directly into automotive batteries and energy storage systems without dedicated external measurement equipment.
On-chip EIS enables continuous battery diagnostics during operation, charging and rest
EIS works by superimposing an AC current on a battery and calculating impedance from the voltage and current response, a technique previously reliant on standalone lab equipment. By embedding this capability into the battery monitoring IC, NTCJ enables continuous, in-system monitoring of internal battery conditions across all operating states -- driving, charging and idle.
Chip targets state-of-health estimation and early fault detection for EV and storage batteries
Impedance data collected through EIS allows estimation of state of health (SOH) and internal temperature, prediction of battery lifetime, and early detection of cell abnormalities -- metrics that conventional voltage, current and temperature sensing alone cannot reliably capture. NTCJ positions the capability as a safety enhancement for electric vehicle batteries and stationary energy storage systems.
NTCJ pairs silicon with EIS analysis algorithms and automaker-validated support
Beyond the IC itself, NTCJ is providing EIS analysis algorithms and end-to-end integration support, covering measurement environment setup through estimation and abnormality-detection functions. The company says this expertise was developed through verification work with automakers and research institutions, intended to shorten development cycles for customers building battery diagnostic systems from scratch.