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:
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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\$– cylexCommented Dec 19, 2016 at 21:23
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\$\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\$ Commented Dec 19, 2016 at 21:29