Are I/O pins 5V TTL compatible?

[mohan]

Posted on December 12, 2007 at 11:08

Are I/O pins 5V TTL compatible?

[mohan]

Posted on May 17, 2011 at 12:19

I am using STM32F101 device.It is 3.3V operating.

I want to interface 5V compatible LCD to microcontroller. Are the I/O pins of microcontroller are 5V TTL compatible?

[sjackson]

Posted on May 17, 2011 at 12:19

If you look in the datasheet for the STM32 (Table 3 on page 20 of the latest datahseet), pins that are 5V tolerant are marked with ''FT'' in the I/O Level column. It is my understanding that these pins can handle up to 5V for an input, but will only be able to generate voltages up to Vdd.

Hope that helps. [ This message was edited by: SJackson on 12-12-2007 14:19 ]

[obtronix]

Posted on May 17, 2011 at 12:19

use a pullup resistor to the 5V rail to generate 5V outputs