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I'm trying to make my STM32 communicate VIA Can. Therefore I'm making use of the CAN transceiver MCP 2551. In many circuits I've seen a 100 nF between Ground and Vdd. What is the reason for that? Here an example:Example schematic showing a MCP2551 with 100nF capacitor between VDD and VSS

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It's called a decoupling or power supply bypass capacitor. It's used to reject noise from the supply pins of an IC.

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  • \$\begingroup\$ Ok thanks! How do I determine which capacity is needed for a decoupling capacitor? \$\endgroup\$ – zerocool Dec 19 '16 at 21:23
  • \$\begingroup\$ Dig around dim's links for some good suggestions and explanations if you're curious, but the most common (that I've seen) is 0.1uF. \$\endgroup\$ – calcium3000 Dec 19 '16 at 21:29

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