Interface microcontroller output(0 to 4.7) to gsm (0 to 3 )

[karthikchittur]

Hi everyone,

i am doing a project on GSM and microcontroller(AT90CAN128).I want to connect
serial communication pins (Tx,Rx) of uC to gsm (TTL and CMOS respectively).

Please help me to build a simple interface circuit without any ic (space problem).


Thanks in advance.
Karthik

 

[Rafael]

Re: Interface microcontroller output(0 to 4.7) to gsm (0 to

Be carefull with Q switching time...

Hope this help

Rafael

 

[karthikchittur]

Re: Interface microcontroller output(0 to 4.7) to gsm (0 to

Does this ckt works ????

 

[gorkin]

Re: Interface microcontroller output(0 to 4.7) to gsm (0 to

Exist ic dedicated for this funcrion, check for "voltage translators" in ti and maxim-dallas website.

Gorkin.

 

[karthikchittur]

Re: Interface microcontroller output(0 to 4.7) to gsm (0 to

Sorry guys i forgot to mention that i have limited space on my board.
So i can only use basic circuits but not IC's.

 

[enggashar]

I am having the same sort of problem in interfacing the CMOS to TTL.
Can any body name a specific IC for the translation?