Maxim to replace MCU-based automotive authentication devices
DS28E40 Automotive 1-Wire Certification Device Launched
Small PCB space and code base, resulting in high reliability


As vehicle functions become increasingly sophisticated, safety and security risks are also rising. Vehicle manufacturers use authentication devices to verify that OEM-certified components are properly installed for safe vehicle operation and to mitigate the risk of malware attacks. However, most security MCUs require a relatively large footprint, and software development teams are also needed to generate code for testing and debugging.

Maxim Integrated Korea launched the 'DS28E40', a DeepCover® automotive 1-wire security authentication device that operates on parasitic power to enhance the safety, security, and data integrity of systems installed in vehicles and reduce design complexity, on the 14th.

For MCU-based solutions, the larger the codebase, the greater the risk of bugs that negatively impact performance or the infiltration of malware. Furthermore, ^I2 C/SPI interface automotive security solutions require as many as 5 to 6 interface pins, including dedicated power and reset lines; the more pins there are, the higher the cost and the more reliability issues arise.

The DS28E40 meets the AEC-Q100 standard Grade 1 performance criteria and replaces MCU-based methods. It reduces system design complexity while meeting security demands by providing manufacturers with the desired algorithms and command sets. It includes public/private key asymmetric ECDSA (ECC-P256 curve) as well as other key authentication algorithms, allowing for the elimination of the need for proprietary device-level code development.

The 1-wire interface combines power and communication onto a single pin, requiring only two connection pins, including a ground pin, compared to the six pins previously required. Fewer connection pins allow for a smaller cable harness size to connect the ECU to a remote endpoint, thereby reducing costs and ensuring reliability. It is housed in a 4mm × 3mm TDFN package with an operating temperature range of –40 to +125°C.

The DS28E40 supports the embedded symmetric key security hash algorithm (SHA-256). It provides hardware-based security stronger than software-based methods by offering secure storage of ECDSA and SHA-256 keys, as well as one-time programmable (OTP) non-volatile memory for storing digital certificates and production data.