Peripheral Sensor Interface 5
PSI5 (Peripheral Sensor Interface 5) is a digital interface for sensors.
PSI5 is a two-wire interface, used to connect peripheral sensors to electronic control units in automotive electronics. Both point-to-point and bus configurations with asynchronous and synchronous data transmission are supported.
Functional Description
PSI5 is a current interface with modulation of the sending current for data transmission on the power supply lines. The relatively high sending current and the usage of a Manchester Code for bit encoding results in a high immunity against radiated immission. The usage of an inexpensive twisted pair cable is thus sufficient for most of the applications. Data words consist of two start bits, 8 to 24 data bits and a single parity bit or optional three bit CRC (Cyclic Redundancy Check).
Standardization
Following the goal of an open interface standard, PSI5 was developed on the basis of existing proprietary implementations of the companies Autoliv, Bosch and Continental. A first common publication was released at the "Sensor" trade ferry in Nuremberg in Mai, 2005. Since summer 2006, SiemensVDO is also supporting the standardization of PSI5.