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TMS320F2812

Started by February 10, 2007
Hey guys, I'm thinking of making a quick serial interface for the
TMS320F2812 ezDSP board with a max232 and the necessary caps.  I read
somewhere that a 5V signal will blow the chip (SCI is a 5v ttl signal
right?).  Is this true for all interfaces, or just the GPIO.

Thanks for any input!

divzr0@gmail.com wrote:

>Hey guys, I'm thinking of making a quick serial interface for the >TMS320F2812 ezDSP board with a max232 and the necessary caps. I read >somewhere that a 5V signal will blow the chip (SCI is a 5v ttl signal >right?). Is this true for all interfaces, or just the GPIO.
Go for the MAX3232, or a similar IC, then you can convert the +-12V to 0V/3V logics...

divzr0@gmail.com wrote:

> Hey guys, I'm thinking of making a quick serial interface for the > TMS320F2812 ezDSP board with a max232 and the necessary caps. I read > somewhere that a 5V signal will blow the chip (SCI is a 5v ttl signal > right?). Is this true for all interfaces, or just the GPIO.
Quick and dirty solution: one 74HC00 and a resistor of 10k is all that you need. 1. Power the 74HC00 from 3.3V on the board. 2. Use one invertor with R = 10k in series with the input as RxD input buffer. 3. Use the other invertor as the TxD output buffer. Although I wouldn't recommend to use this solution in production, it is quite good for the prototyping purpose. Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com