ts-7000
[Top] [All Lists]

Re: [ts-7000] TTL serial on a TS7200

To: "" <>
Subject: Re: [ts-7000] TTL serial on a TS7200
From: Jim Jackson <>
Date: Fri, 28 Feb 2014 22:52:17 +0000 (GMT)


On Fri, 28 Feb 2014, Jonathan Leslie wrote:

> wait a sec, the resistor will fix the the 5v to 3.3 volt issue by limiting 
> the current?   I don't understand. 

It's a common trick when interfacing 5v logic to 3.3v logic devices. Nearly
all devices have, effectively, forward diodes between inputs and the +power
line and a reverse diode to ground. By just using a resistor from a 5v
ouput to a 3.3 volt input you use the forward diode to the 3.3v supply to
clamp the output. See Tip #10 of Microchip's 3v Tips and tricks. A copy be
had at...

  
http://www.newark.com/pdfs/techarticles/microchip/3_3vto5vAnalogTipsnTricksBrchr.pdf

cheers
Jim

>
>
>
> >________________________________
> > From: Didier Juges <>
> >To: 
> >Sent: Friday, February 28, 2014 3:08 PM
> >Subject: Re: [ts-7000] TTL serial on a TS7200
> >
> >
> >
>
> >Be careful that some GPS modules output 5V TTL. That will fry rour TS-xxxx 
> >in a hurry. I know that for a fact.
> >
> >
> >You do not need RS-232 level shifters, but you may need one to go from 5V to 
> >3.3V. Usually, a 4.7k resistor in series with the Tx output of the GPS is 
> >all you need. The input of the TS-xxxx will clamp at 3.3V and the resistor 
> >will limit the current to a safe value. No need to do anything with the Tx 
> >output of the TS-xxxx. The 5V device will accept 3.3V inputs just fine.
> >
> >
> >Didier
> >
> >
> >
> >
> >On Fri, Feb 28, 2014 at 9:46 AM, Jonathan Leslie <> wrote:
> >
> >
> >> 
> >>I dont' know the ts7200 specifically, but the ts7500 you just solder onto 
> >>the RX and GND pins to the gps modules TX and GND pins and you are hardware 
> >>ready to go. The GPS module broadcasts 1 a second a dump at 4800 BPS. 
> >>
> >>
> >>
> >>
> >>  
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>>________________________________
> >>> From: Yan Seiner <>
> >>>To: 
> >>>Sent: Friday, February 28, 2014 10:40 AM
> >>>Subject: [ts-7000] TTL serial on a TS7200
> >>>
> >>>
> >>>
> >>> 
> >>>I have a TS7200 that I'd like to interface with a GPS module.  Most of
> >>>the bare modules are TTL - 3.3 to 5V.  Is there a way to set up a serial
> >>>port on the 7200 with ttl levels?
> >>>
> >>>I need RX, TX, and DCD pins active on the serial port for the GPS.
> >>>
> >>>
> >>>
> >
> >
> >
> >

------------------------------------

Yahoo Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/ts-7000/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/ts-7000/join
    (Yahoo! ID required)

<*> To change settings via email:
    
    

<*> To unsubscribe from this group, send an email to:
    

<*> Your use of Yahoo Groups is subject to:
    http://info.yahoo.com/legal/us/yahoo/utos/terms/

<Prev in Thread] Current Thread [Next in Thread>
Admin

Disclaimer: Neither Andrew Taylor nor the University of NSW School of Computer and Engineering take any responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the birding-aus mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU