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I2C Analog pins

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Manuel Hollfelder edited this page Oct 25, 2020 · 2 revisions

Arduino Uno R3 format dictates that A4 and A5 are also used for I2C operations, so when I2C is enabled analogue inputs A4 and A5 are NOT available.

On Arduino Uno R3 this is an alternate pin function, depending on which XMC-for-Arduino boards this could be an alternate pin function, or other case as described below.

Board Functionality Note
XMC1100 Boot Kit NOT supported A4 + A5 are separate
A6 + A7 are alternate pin configurations to I2C
XMC1300 Boot Kit NOT same pin format
as Arduino Uno R3		 A10 + A11 are alternate pin configurations to I2C
XMC1400 Arduino Kit Alternate pin function Matches Arduino Uno
XMC4400 Platform 2Go External hard wired pins For 3V3 boards set I2C pins to tristate or open drain to use
For 5V boards see Wiki board page on track cuts to enable A4 and A5 to work
Level shifter on the 5V board could interfere with tristate/open drain setting
XMC4700 Relax Kit
(and variants)		 External hard wired pins For 3V3 boards set I2C pins to tristate or open drain to use
For 5V boards see Wiki board page on track cuts to enable A4 and A5 to work
Level shifter on the 5V board could interfere with tristate/open drain setting
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