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GSM Intreface!

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auto_mitch

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Hi!
i have a problem on interfacing my GSM module with ATMega 128.
i use the A2D Falcom GSM Module. The voltage outputs of gsm is 3.8V Cmos i want to convert it to ttl signal.
i thing of using a buffer chip but i dont know which one.
Could u help me???
thanks
 
A 3.8V CMOS level will normally fall within the acceptable range for a TTL level input gate. That is, 0-0.8V for low and 2.5-5.0V for high. You may try connecting it directly to test.
 
auto_mitch said:
Hi!
i have a problem on interfacing my GSM module with ATMega 128.
i use the A2D Falcom GSM Module. The voltage outputs of gsm is 3.8V Cmos i want to convert it to ttl signal.
i thing of using a buffer chip but i dont know which one.
Could u help me???
thanks

An easier alternative would be to buy my 5v CMOS GSM cellular modem ;)

It'll connect directly up to either of the mega128's UARTs, and it'll come with a printed 300 page manual of commands for the modem! I even lovingly hand punched every hole myself to put it into a 3 ring binder and it also has a blood red development kit to use with it!
 
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