(Alban fixed link)
Message Edited by Alban on 05-09-2006 10:51 AM
Message Edited by UK_CF_FAE on 05-10-200603:15 PM
Hello Toussaint,
Provided you don't need a lot of speed, the use of open drain N-channel MOSFETs might be suitable. The MOSFET type should be capable of switching with 3V logic levels at its gate (and would also suitable for 5V levels). The drain would connect to the logic input, and would also require a suitable pull-up resistor to either 3V or 5V, depending on the conversion direction. The resistor value will depend to some extent on the speed you require.
Of course your code will need to allow for inverted polarity through the device.
An alternative to the MOSFET could be the use of bi-polar NPN transistors, but these would need an additional resistor in series with the base.
Regards,
Mac
BC 109 wrote:
Hi,
I'm a brand new user of HCS08 family (HCS08QG8). This MCU is running at 3.3v, and I have no experience about how to connect 5v peripherals. I was previously using HC11 at 5v.
I read lots of things about 5v-tolerant inputs, direct-driving of 5v inputs from 3.3v outputs, and various level converters (74LVC, 74ALVT, etc...) As I'm completely novice with 3.3v logic, could someone point me out some kind of tutorial or 3.3v beginner's guide in relation with HCS08 MCU ?
Also, are there anny Application Notes about that ?
Thank you in advance,
Toussaint OTTAVI