CAN FD transceivers feature high bus fault protection and CMTI

By Alex Pluemer, contributing writer

Texas Instruments Inc. recently launched two new isolated controller area network (CAN) flexible data rate (FD) transceivers that the company claims feature the highest bus fault protection, highest common-mode transient immunity (CMTI), and lowest electromagnetic emissions on the market.

The ISO1042 and the ISO1042-Q1 deliver faster communication speeds than the classic CAN standard and a higher working voltage than their competitors in a 35% smaller package, helping designers to better protect low-voltage circuits and increase communication throughput in hybrid and electric vehicles as well as in industrial applications ranging from grid infrastructure and motor drives to building automation.

The ISO1042 and ISO1042-Q1 devices provide a working voltage of 1,000 Vrms — 18% higher than the competition — and a withstand voltage of 5,000 Vrms, resulting in longer device lifetimes and enhanced system reliability. They also feature a high bus fault protection of ±70 V that provides a 20% higher short-to-DC margin, allowing them to protect 12-V, 24-V, and 48-V battery or power supply systems during high-voltage shorts.

The devices’ high electromagnetic immunity — featuring a CMTI of 85 kV/us (minimum) and an ESD protection of ±8 kV according to the International Electrotechnical Commission (IEC) testing standard — allows developers to design electronic devices that can reliably operate in noisy conditions. Both transceivers also provide industry-low electromagnetic compatibility (EMC) emissions — ensuring system signal integrity — and the ISO1042-Q1 meets the automotive industry standard (IEC TS62228) for robust EMC.

The ISO1042 and ISO1042-Q1 support CAN speeds of up to 5 Mbits/s with a short loop delay of 215 ns maximum, resulting in faster payload compared to traditional CAN-based systems.

Both are currently available from the TI store and TI’s authorized distributors in a 16-pin, 10.3 × 7.5-mm package or an eight-pin, 5.8 × 7.5-mm SOIC package. Pricing begins at $1.69 for industrial versions and $1.99 for automotive versions (both in quantities of 1,000).

TI also offers evaluation modules for the new transceivers, the ISO1042DWEVM and ISO1042DWVEVM , for $49.00 at the TI store or through authorized distributors. TI offers additional resources such as datasheets, application notes, videos, and a community forum.