AnsweredAssumed Answered

GPIO power on STM32 (STM32F205RBT6) can be different voltages?

Question asked by woolfson.aaron on Jun 7, 2013
Latest reply on Jun 7, 2013 by Clive One
Good morning. First time poster.  I am somewhat new at using the STM32 line of MCU's and have a general question that nobody can seem to answer for me.  I am using the STM32F205RBT6 inside of a design.  The STM32 will talk to a couple of different parts; one of the parts uses 1.8v for its' I/O , the other part uses 2.4v for its' I/O.  

If I power the MCU with 3.3volt, does the GPIO output at 3.3volt; if I power the MCU at 1.8v, does the GPIO output at 1.8v?  Is there any way to power the MCU with 3.3v but bias the GPIO at 3.3v; or visa-versa?  Without using something like a Texas Instruments  SN74AVC4T245 bus level shifter?

Thank you, in advance, for your thoughts.

Outcomes