Silicon Labs CP210x: Can I run an external IC with the built-in regulator?

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Silicon Labs CP210x: Can an external IC operate with the internal regulator?

CP21xx

The CP210x has an internal regulator so you can supply 5V to the REGIN (VREGIN) pin to generate the 3.3V needed to operate the CP210x. The generated 3.3V can be supplied to an external IC via the VDD pin.

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There is an upper limit to the current that a regulator can generate. Some of it is consumed by the CP210x itself, so the rest can be used by external ICs.
The following figures are excerpts from the datasheet. Please check the data sheet for the latest figures. Also, the CP210x current consumption does not include I/O consumption.

	Regulator Generated Current (MAX)	CP210x current consumption (TYP)	CP210x current consumption (MAX)
CP2102	100mA	20mA	26mA
CP2103	100mA	20mA	26mA
CP2104	100mA	17 mA	18.5mA
CP2105	100mA	17 mA	18.5mA
CP2108	150mA	56mA	-
CP2109	100mA	17 mA	23mA

Please refer to the Silicon Labs community site for the latest information.

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