Supply-monitoring IC offers functional safety features for automotive systems
ROHM Semiconductor’s BD39040MUF-C is the industry’s first power supply monitoring IC that includes a built-in self-test (BIST), self-diagnostics that address the extreme functional safety necessary for advanced driver-assistance systems (ADAS) and automated driving applications. Fail-safe systems targeted include electric power steering and cameras and sensors for autonomous driving. In addition, the IC specifically addresses applications such as radar, electronic control units (ECUs), dashboard cluster, LCD panels, infotainment, lamps, and any power system requiring fail-safe measures beyond ASIL-B standards.
The BD39040MUF-C provides self-diagnosis and flexible support and integrates the monitoring necessary for automotive power supplies and ECUs.
The power supply monitoring IC features voltage monitoring functions (Power Good, reset) and a watchdog timer. Relying on ROHM technology, the IC makes it possible to detect power supply IC failure without affecting existing systems. ROHM’s LCD chipset, created in 2017, included LCD drivers and power supply ICs ahead of the industry. The following year, ROHM received certification of the development process under ISO 26262. Now, to address system safety and redundancy, the BD39040MUF-C integrates a wide range of self-test and monitoring functions into a compact 3-mm square package, delivering high safety and addressing the industry’s miniaturization requirements.
Features also include multiplexed reference voltage and oscillator circuits, enabling continuous monitoring between systems, improving safety during normal operation. Specs include an input voltage range of 2.7 V to 5.5 V, a reset function, and a four-channel monitoring function for overvoltage and undervoltage. There are also reference and oscillation frequency self-monitoring functions.
The IC is currently sampling, with OEM quantities expected in August 2019.
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