[aprssig] GPS and PIC16F628

Scott Miller scott at opentrac.org
Wed Apr 24 19:21:26 EDT 2013

The parameter you want is Vih.  The data sheet says it's 2.0v for 5v 
operation, or .25 Vdd * 0.8V otherwise for ports with TTL buffer.  For 
Schmitt trigger inputs it's 0.8 * Vdd.  You'll need to look up which the 


On 4/24/2013 3:45 PM, Andrew Rich wrote:
> Hello
> Wondering if someone can help
> I am having troubles spotting the minimum voltage swing for a GPS
> voltage on a PIC16F628 PIC MCU USART
> http://ww1.microchip.com/downloads/en/devicedoc/40300c.pdf
> I want to use Scotts TTL GPS but I need to make sure it swings high
> enough to make 1 and 0
> So I can do away with the MAX232 chip I am using now
> - Andrew -
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