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{{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'' * '' Inte ...
for
sensor A sensor is a device that produces an output signal for the purpose of sensing a physical phenomenon. In the broadest definition, a sensor is a device, module, machine, or subsystem that detects events or changes in its environment and sends ...
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 code 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 wiring used for communications 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 ba ...
cable is thus sufficient for most of the 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 t ...
). 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 the companies Autoliv, Bosch and Continental. A first common publication was released at the "Sensor" trade fair in Nuremberg in May 2005. Since summer 2006, SiemensVDO also supports the standardization of PSI5. Siemens VDO is now a part of the Continental group of companies. IEC EMC standard for Peripheral Sensor Interface 5 (PSI5) IEC62228-6 "Integrated circuit - EMC Evaluation of transceivers - Part 6:PSI5 transceivers" is ongoing.


See also

*
List of network buses List of electrical characteristics of single collision domain segment "slow speed" network buses: {, class="wikitable sortable" style="width:100%;" ! Name !! Multidrop !! Max nodes !! Electrical type !! Cable type !! data-sort-type="number", Max ...


External links


psi5.org - PSI5

psi5-forum.com - PSI5-Forum
Serial buses