I've need help on interfacing the output 5V from counter to the input 0.8V of my fabricated chip. Would someone give ideas on how to do this without burn my chip.Thanks
Thanks for the response. But is voltage divider works fine with the digital signal? or do I have to use logic level converter or level shifter? I do need to make it as simple as possible because I need to test my chip urgently.
You didn't specify anything about the signal, is it a very high frequency, does your input stage of the chip have a high impedance?
Other than that a resistive voltage divider can easily be used.
I'm afraid I haven't used anything like that, I have only used a divider in mcu signals but I think that you have to use a divider like in an oscilloscope probe with a capacitor.
I'm afraid that a simple potential divider will not work with such high speed signal. I tried it with baud rate 115k and it slow down the connection speed.
I find it strange, maybe it had to do with the characteristics on the TXD and RXD signals of the GPRS?
What divider did you use, was it 5v to 3v3 from mcu to GPRS in the transmit line?
And what about the signal from the GPRS to the mcu, did you connect the 3v3 to the 5v mcu?