IEICE Electronics Express
Online ISSN : 1349-2543
A battery monitoring IC with an isolated communication interface for electric vehicles
Tong WangYe ZhaoJie Chen
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2018 Volume 15 Issue 12 Pages 20180513


This paper presents a Li-ion battery monitoring and protection IC suitable for monitoring 12 battery cells for electric vehicles (EVs). A two-wire, transformer based, isolated interface is proposed to provide the interface for the cascaded ICs. The interface uses the “balanced” two-wire technology and encodes the four SPI signals into DC-free pulse that can be coupled by a transformer, which features high-speed, low electromagnetic interference (EMI), and reliable data transmission. The IC was fabricated in a 0.18 µm, 60 V BCD process, with a total chip area of 4.4 × 3.6 mm2. Measurement results show that the proposed interface can achieve a data rate up to 1 Mbps. Meanwhile, the measured current consumption is less than 45 µA in sleeping mode.

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© 2018 by The Institute of Electronics, Information and Communication Engineers
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