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Achieving standardized HS-CAN communication from a 3.3VCC supply

Posted: 14 Aug 2009     Print Version  Bookmark and Share

Keywords:CAN communications  transceiver MAX13041  MAX638 charge 

Charge pumps are often the best choice for powering an application requiring a combination of low-power, low-voltage operation and low cost. This application note explains how to supply the MAX13041 HS-CAN transceiver with the MAX683, a 3.3V-input-to-regulated-5V-output charge pump. It also discusses the impact on electromagnetic emissions and immunity.

Compliance with the ISO 11898-2 standard for high-speed CAN communication is only guaranteed if the VCC power supply of the MAX13041 is between 4.75V and 5.25V (normal operating-voltage range).1 That means, if CAN communication is required, a 5V rail for the CAN transceiver supply has to be available.

A familiar problem in system engineering, however, is that the subsystem's power requirements are not met by the main supply rails. In such cases, the available power rails are often not directly usable: there is only a single 3.3V supply available, or the direct use of the battery voltage is not an option for generating all required rails. Lack of space can prevent inclusion of the optimal number of supplies. In other cases, generating the 5V directly from the battery rail might not be acceptable due to heat dissipation issues, especially in systems that need CAN communication at high battery voltages (e.g. during a double-battery condition in a vehicle or in a 24V truck system).

Voltage converters can generate the desired voltage levels, and charge pumps are often the best choice for applications requiring some combination of low power, simplicity, and low cost. Charge pumps are easy to use, because they do not require expensive inductors or additional semiconductors.

View the PDF document for more information.





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