Upsd33xx power supply

francescatodiego2 · ‎2005-08-12

Posted on August 12, 2005 at 14:56

francescatodiego2 · ‎2011-05-17

Posted on May 17, 2011 at 12:06

I am working with uPSD32xx (5V model) and I plan to migrate to uPSD33xx but I have a problem:

5V supply is only for PSD, microcontroller work with 3.3V, is true ?

If yes, I must work with microcontroller bus at 3.3V and external peripheral chip select from port B at 5V ?

Demo board DK3300-ELCD work with PSD3.3V or PSD 5V?

thanks for help

gbillard9 · ‎2011-05-17

Posted on May 17, 2011 at 12:06

Yes, uPSD core is 3.3 V

If you work with external peripheral port at 5V you have to route the pin of the bus on a PSD port and to adapt the level of rd/ an wr/. The second solution is to find a componant to adapt the 3.3V bus to 5V

Demo board DK3300 work with 3.3V for MCU