[SOLVED] Do I need a Logic Level Shifter

[kulks]

Hi All,

I'm interfacing a GPS module with a ARM processor using UART communication.

I tested the output voltage from the GPS, its 2.85 v as per the datasheet and the pin which I'm connecting on the board(MCB 1700, LPC 1768 microcontroller) has a description like this

“5v Tolerant pad providing digital I/O functions with TTL levels and hysteresis. This pin is pulled up to a voltage level of 2.3V to 2.6V”

So, I believe 2.85 v shouldn't cause a problem as its 5v tolerant and shouldn't it be able to pull up with 2.85v.

Do you think I need a level shifter to bring down the voltage to fall with in the range of 2.3v to 2.6 v or I can go ahead with direct interfacing?

Thanks.

 

[sivamani]

Since uc support 5v Tolerant IOs it should not be a problem.

 

[kulks]

Since uc support 5v Tolerant IOs it should not be a problem.

Thank you Sivamani for the reply