Editing CAN bus (section)

{{Short description|Standard for serial communication between devices without host computer}}
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{{lead too short|date=November 2020}}
{{Technical|date=January 2024}}
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{{Use American English|date=May 2023}}

{{Infobox connector <!-- NOTE: Not a perfect template match, but good enough for now -->
| name = Controller Area Network
| type = [[Serial communication]] [[Bus (computing)|bus]]
| image = Image:CAN Logo.svg
| logo = 
| caption = Unofficial logo of the CAN bus by CAN-in-Automation.
| designer = [[Bosch GmbH]]
| design_date = {{Start date and age|1983}}
| manufacturer =
| key_people =
| production_date =
| superseded =
| superseded_by =
| superseded_by_date =
| external = No
| hotplug =
| length =
| width =
| height =
| electrical = Differential
| maximum_voltage = 16V DC
| maximum_current =
| data_signal = Transceiver driven
| data_bit_width = 1 bit (bidirectional)
| pin_custom1_name = CAN-H
| pin_name_custom1 = CAN High (Yellow)
| pin_custom2_name = CAN-L
| pin_name_custom2 = CAN Low (Green)
| data_bandwidth = CAN 2.0 up to 1{{nbs}}[[Megabit|Mbit/s]],<br />[[CAN FD]] up to 8{{nbs}}Mbit/s,<br />CAN XL up to 20{{nbs}}Mbit/s
| data_devices = 32, 64 or 127 (depending on standard)
| data_style = [[Serial communication|Serial]], [[half-duplex]], Asynchronous
| cable =
| physical_connector =
| num_pins =
| pinout_col1_name =
| pinout_col2_name =
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| pinout_notes =
}}

A '''controller area network bus''' ('''CAN bus''') is a [[vehicle bus]] standard designed to enable efficient communication primarily between electronic control units (ECUs). Originally developed to reduce the complexity and cost of electrical wiring in automobiles through [[multiplexing]],<ref name="can-cia" /> the CAN bus protocol has since been adopted in various other contexts. This [[Broadcasting (networking)|broadcast-based]], [[Message passing|message-oriented]] protocol ensures data integrity and prioritization through a process called [[Arbiter (electronics)|arbitration]], allowing the highest priority device to continue transmitting if multiple devices attempt to send data simultaneously, while others back off. Its reliability is enhanced by [[Differential signalling|differential signaling]], which mitigates electrical noise. Common versions of the CAN protocol include CAN 2.0, [[CAN FD]], and CAN XL which vary in their data rate capabilities and maximum data payload sizes.