Among the currently available sensor interfaces for automotive applications, only the PSI5 interface - as standardized in the new 2001 PSI5 V2.0 - meets the rising system requirements, the increased requirements of the new environmental regulations, and the requirements of current functional safety standards. PSI5 not only features the capability to transmit highly accurate sensor data, high EMC robustness, bus capability, and bidirectional communication, but also offers savings in the cable harness and a reduced number of connector pins by using just two wires. It therefore offers enhanced technical functionality at a reasonable cost. To improve the environmental friendliness and sustainable operation of drive concepts, Bosch is also employing sophisticated and cross-linked sensors, actuators and control units. In addition, there is also the need to optimize system functions, weight, construction space and costs. The new version PSI5 V2.0 is a universal standard for automotive applications from the airbag, chassis and powertrain domains. In particular, the new standard satisfies the specific powertrain requirements: lower supply voltage, fast initialization, new flexible data frame format and protocol. PSI5 fulfills the future requirements for OBD legislation and manipulation detection, improves sensor signal accuracy, and features detailed and reliable error and status indication for diagnostic purposes at the ECU. In future, the first advantageous application of PSI5 will be realized at the digital rail pressure sensor for Common Rail injection systems and its connected control unit. Further applications with transmission of several sensor signals on 2 wires and the connection of sensors to one sensor bus are planned. The next generation of automotive microcontrollers in powertrain control units of Bosch MDG1, with series production planned for 2014, fully supports PSI5.
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