I am facing some issues in driving output to low using output_low(PIN_A2).
Here are the readings:
1) output_low(PIN_A2) : 0.71V
2) output_high(PIN_A2): 3.3V
Kindly let me know what can be the issue. This problem occuring on PORTA and PORTC but not on PORTG. I am using PIC18F67J50.
Please let me know what can be reason. I am not using fast_io.
Thanks
SherpaDoug
Joined: 07 Sep 2003 Posts: 1640 Location: Cape Cod Mass USA
Posted: Fri Apr 23, 2010 9:26 pm
Those seem like valid logic low and high voltage levels. How much current are you putting through the pin? What is your supply voltage? What does the data sheet say you should be expecting? _________________ The search for better is endless. Instead simply find very good and get the job done.
akshaymathur39
Joined: 05 Aug 2008 Posts: 11
Posted: Sat Apr 24, 2010 10:10 pm
Maximum Low Voltage: 0.4V
Minimum High Voltage: 2.4V specified at Vdd = 3.3V
My supply voltage is 3.3V and I am just using multimeter to check voltage, there is no load driven through the pin.
vinniewryan
Joined: 29 Jul 2009 Posts: 154 Location: at work
Posted: Sun Apr 25, 2010 1:23 am
Are you using a pull-down resistor? If you want a lower 'low', connect a resistor from the pin to ground. I use 100K pulldown resistors for most of the output pins I use, and 2.2-10K for inputs that need a good ground reference. It really depends on your circuits needs. _________________ Vinnie Ryan
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