On a microcontroller board that I am working on, there is a buffer chip between the microcontroller
TI msp430 F1611 and USB interface
FTDI FT232BL. The chip is named NC7WZ126.
My question is, why they have used that buffer? what benefits it has and what would happen if that chip was not there at all?
I am asking this because I want to wire up directly to TX/RX pins of the msp430 for some debugging purpose. So should I directly wire to the msp430 pins (Pins #34 and #35)? Or I should wire to the inputs of the buffer (pin 2 and 3 of NC7WZ126)
AFAIK msp430 is using 0-3.3V for low-high (Since its get its Vcc after a 3.3 regulator) bits and that FTDI is 5 Volts (powered by USB) so can be that a reason for that buffer? Considering That I want to feed in 5V CMOS to RX/TX of msp 430, then I should wire to the buffer and not to the 430?