{{Short description, Digital interface for sensors Peripheral Sensor Interface (PSI5) is a digital

interface Interface or interfacing may refer to: Academic journals * ''Interface'' (journal), by the Electrochemical Society * '' Interface, Journal of Applied Linguistics'', now merged with ''ITL International Journal of Applied Linguistics'' * '' Inter ...

for

sensor A sensor is often defined as a device that receives and responds to a signal or stimulus. The stimulus is the quantity, property, or condition that is sensed and converted into electrical signal. In the broadest definition, a sensor is a devi ...

s. PSI5 is a two-wire interface, used to connect peripheral sensors to electronic control units in

automotive electronics Automotive electronics are electronic systems used in vehicles, including engine management, ignition, radio, carputers, telematics, in-car entertainment systems, and others. Ignition, engine and transmission electronics are also found in tru ...

. Both point-to-point and bus configurations with

asynchronous Asynchrony is any dynamic far from synchronization. If and as parts of an asynchronous system become more synchronized, those parts or even the whole system can be said to be in sync. Asynchrony or asynchronous may refer to: Electronics and com ...

and

synchronous Synchronization is the coordination of events to operate a system in unison. For example, the conductor of an orchestra keeps the orchestra synchronized or ''in time''. Systems that operate with all parts in synchrony are said to be synchrono ...

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 code In telecommunications and data storage, Manchester code (also known as phase encoding, or PE) is a line code in which the encoding of each data bit is either low then high, or high then low, for equal time. It is a self-clocking signal with no ...

for bit encoding result in high immunity against interference from radiated emissions. The use of an inexpensive

twisted pair Twisted pair cabling is a type of communications cable in which two conductors of a single circuit are twisted together for the purposes of improving electromagnetic compatibility. Compared to a single conductor or an untwisted balanced ...

cable is thus sufficient for most applications, however, in automotive more expensive cabling is employed. Data words consist of two start bits, 8 to 24 data bits and a single

parity bit A parity bit, or check bit, is a bit added to a string of binary code. Parity bits are a simple form of error detecting code. Parity bits are generally applied to the smallest units of a communication protocol, typically 8-bit octets (bytes) ...

or optional three bit CRC (

cyclic redundancy check A cyclic redundancy check (CRC) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to digital data. Blocks of data entering these systems get a short ''check value'' attached, based on ...

). The bitrate is 125 kbit/s or optionally 189 kbit/s.

Standardization

Following the goal of an open interface standard, PSI5 was developed on the basis of existing proprietary implementations of companies Autoliv, Bosch and

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. A first common publication was released at the "Sensor" trade fair in Nuremberg in May 2005. Since summer 2006, Siemens VDO also supports the standardization of PSI5. Siemens VDO is now a part of the Continental group. IEC EMC standard for Peripheral Sensor Interface 5 (PSI5) IEC62228-6 "Integrated circuit - EMC Evaluation of transceivers - Part 6:PSI5 transceivers" is ongoing.

External links

psi5.org - PSI5

psi5-forum.com - PSI5-Forum
Serial buses

Functional description

Standardization

See also

External links