Hi!
To protect the MSP, I use a resistor and a zener diode. Works fine :-)
Some TTL inputs recognites 2.4V as Hi level. And that TTL inputs dont
provide voltage to damage the MSP...
cya
Samuel
Ricardo H. Wiggers wrote:
Hi All..
Thanks, but I still have a question.. In the case o MSP can I rely on the
internal protection diodes and simply add a resistor between buses (5V and
3V), provided my 5V chip accepts TTL levels (and MSP grants it)? With TI
2407 I know it´s possible, provided I keep the current low enough (and thats
not a problem with MOS...). Lets say a 10k res. between buses (in series).
----- --------
| |
MSP |----\/\/\-----| 5VCI
| |
----- --------
Thanks,
Ricardo
----- Original Message -----
From: "Matthias Weingart" <[email protected]>
To: <[email protected]>
Sent: Sunday, October 06, 2002 5:54 AM
Subject: Re: [Mspgcc-users] Guys, what do you think of this...
You only need one N-Fet and a resistor for bidirectional coupling
between 3 and 5 volt ports:
http://www.semiconductors.philips.com/buses/i2c/facts/index.html#levelshifti
ng
(it works especially for open collector or open drain like outputs, a
MSP430
port is just fine).
Matthias
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