Most MEMS devices to date feature a digital interface compatible with standard communication protocols like I2C and SPI. However, increasingly rigorous automotive requirements—particularly those related to real-time, deterministic communications, and safety-critical applications— have driven the development of a new communication bus known as PSI5 (Peripheral Sensor Interface 5). This protocol was initially developed for safety-critical airbag applications but is also widely used in other areas, including powertrain, chassis, and broader safety systems. PSI5 operates on a reliable two-wire current communication system, typically transmitting data at 125 kbps (up to 189 kbps). This efficient setup allows multiple distributed sensors in a vehicle to connect using only two wires for both power and data.