Searching \ for 'max-232 and LVTTL levels?' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/index.htm?key=max+232+lvttl+levels
Search entire site for: 'max-232 and LVTTL levels?'.

Truncated match.
PICList Thread
'max-232 and LVTTL levels?'
2007\01\23@004346 by Art

picon face
Greetings all,

I need a level converter to convert from LVTTL to RS-232. I have a
3.3 volt OEM GPS module that I need to hook up to an RS-232.

If I power the max232 with 3.3 volts, will it limit it's output to
levels between 0 and 3.3 volts on the TTL outputs and still provive
the necessary RS-232 levels as well, or do I need a specialty level
converter for LVTTL to RS-232?

Thanks,

Art

2007\01\23@031346 by Vasile Surducan

face picon face
MAX3232

On 1/23/07, Art <spam_OUTKY1KTakeThisOuTspamverizon.net> wrote:
> Greetings all,
>
> I need a level converter to convert from LVTTL to RS-232. I have a
> 3.3 volt OEM GPS module that I need to hook up to an RS-232.
>
> If I power the max232 with 3.3 volts, will it limit it's output to
> levels between 0 and 3.3 volts on the TTL outputs and still provive
> the necessary RS-232 levels as well, or do I need a specialty level
> converter for LVTTL to RS-232?
>
> Thanks,
>
> Art
>
> -

2007\01\23@064549 by peter green

flavicon
face

> If I power the max232 with 3.3 volts, will it limit it's output to
> levels between 0 and 3.3 volts on the TTL outputs and still provive
> the necessary RS-232 levels as well, or do I need a specialty level
> converter for LVTTL to RS-232?
my guess is that the 3.3V side will be fine but the voltages on the RS232 side will be lower than normal and it may not be able to run as fast, whether thats a problem depends on if the stuff you are talking to is really RS232 compliant (iirc RS232 devices are supposed to be able to recognise an input as low as +-3V but some need higher)

if i had a max232 hanging arround and wanted to do a quick and dirty prototype i'd try it but a chip designed for the job  is probablly your best bet for a dependable setup (note: it seems the max3232 also only uses a voltage doubler so its line voltage is also relatively low, if you want maximum compatibility it may be better to use a max232 running on 5V with some level shifters).



2007\01\23@111343 by Herbert Graf

flavicon
face
On Tue, 2007-01-23 at 00:43 -0500, Art wrote:
> Greetings all,
>
> I need a level converter to convert from LVTTL to RS-232. I have a
> 3.3 volt OEM GPS module that I need to hook up to an RS-232.
>
> If I power the max232 with 3.3 volts, will it limit it's output to
> levels between 0 and 3.3 volts on the TTL outputs and still provive
> the necessary RS-232 levels as well, or do I need a specialty level
> converter for LVTTL to RS-232?

Use a level converter meant for 3.3V. The MAX3232 is one I've used with
success.

No point in my mind trying to use a part out of spec.

TTYL

2007\01\23@121936 by Art

picon face
Thanks to all who commented. The MAX2333 is the answer.

Regards,

Art

At 11:13 AM 1/23/2007, you wrote:
{Quote hidden}

>

More... (looser matching)
- Last day of these posts
- In 2007 , 2008 only
- Today
- New search...