Peripheral Sensor Interface 5
Encyclopedia
Peripheral Sensor Interface (PSI5) is a digital interface
for sensor
s.
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.
for bit encoding result in high immunity against interference from radiated emissions. The use 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
). The bitrate is 125 kbit/s or optionally 189 kbit/s.
Interface (computer science)
In the field of computer science, an interface is a tool and concept that refers to a point of interaction between components, and is applicable at the level of both hardware and software...
for sensor
Sensor
A sensor is a device that measures a physical quantity and converts it into a signal which can be read by an observer or by an instrument. For example, a mercury-in-glass thermometer converts the measured temperature into expansion and contraction of a liquid which can be read on a calibrated...
s.
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 the transmission of data on the power supply lines. The relatively high sending current and the use of a Manchester CodeManchester code
In telecommunication and data storage, Manchester code is a line code in which the encoding of each data bit has at least one transition and occupies the same time...
for bit encoding result in high immunity against interference from radiated emissions. The use of an inexpensive twisted pair
Twisted pair
Twisted pair cabling is a type of wiring in which two conductors are twisted together for the purposes of canceling out electromagnetic interference from external sources; for instance, electromagnetic radiation from unshielded twisted pair cables, and crosstalk between neighboring pairs...
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
Parity bit
A parity bit is a bit that is added to ensure that the number of bits with the value one in a set of bits is even or odd. Parity bits are used as the simplest form of error detecting code....
or optional three bit CRC (Cyclic Redundancy Check
Cyclic redundancy check
A cyclic redundancy check is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to raw data...
). The bitrate is 125 kbit/s or optionally 189 kbit/s.