Help With College project - Comms Level Shift

[Kirky]

I am working on my college project in which I need to perform a level shift
but am unsure where to start.

The levels are as follows


Unit 1 Unit 2

Logic 0 -0.6v 0v
Logic 1 +5 to +6 2.5 to 4.1v

Unit 2 Unit 1

Logic 0 0 to 0.3v 0 to 0.8v
Logic 1 +0.7v to 3.3v 0.7v(min 0.5mA)

The Supply voltage I am working from is 3.6v.

Any help would be much appreciated.

 

[Fred Bloggs]

Kirky wrote:

Baud Rate is 1200, Unit 1 is a Data Logger which we use at work which has
OPTO coupled comms lines and Unit 2 is a National Semiconducter LMX9820
Blue-Tooth serial port module.

Sorry for being vague but im a novice at the moment. Ive got the datasheet
for the LMX9820 but am unsure as to what the impedances are.

Unit 1(S) to Unit 2(R)

Logic 0 -0.6v 0v
Logic 1 +5 to +6 2.5 to 4.1v

Unit 2(S) to Unit 1(R)

Logic 0 0 to 0.3v 0 to 0.8v
Logic 1 +0.7v to 3.3v 0.7v(min 0.5mA)

Unit 1(R) Logic 1 makes no sense- you say 0.7V?

 

[Kirky]

sorry my mistake, that should be 2v.

"Fred Bloggs" <nospam@nospam.com> wrote in message
news:41D83A21.2040608@nospam.com...

Kirky wrote:
Baud Rate is 1200, Unit 1 is a Data Logger which we use at work which
has
OPTO coupled comms lines and Unit 2 is a National Semiconducter LMX9820
Blue-Tooth serial port module.

Sorry for being vague but im a novice at the moment. Ive got the
datasheet
for the LMX9820 but am unsure as to what the impedances are.

Unit 1(S) to Unit 2(R)

Logic 0 -0.6v 0v
Logic 1 +5 to +6 2.5 to 4.1v

Unit 2(S) to Unit 1(R)

Logic 0 0 to 0.3v 0 to 0.8v
Logic 1 +0.7v to 3.3v 2v(min 0.5mA)

Unit 1(R) Logic 1 makes no sense- you say 0.7V?