Re: PIC 16F84A Problems

From: Activ8 (reply2group_at_ndbbm.net)
Date: 07/08/04 

Date: Thu, 8 Jul 2004 18:29:50 -0400

On 8 Jul 2004 14:36:20 -0700, Andrew Holme wrote:

> "Cason" <casonclagg@cox.net> wrote in message news:<jgdHc.60930$rn1.26356@okepread07>...
>> What kind of output do the pins of the 16F84A have as far as Voltage and
>> Current when they are high/low? I use 4.5 Volts to run my circuit.
>
> See http://ww1.microchip.com/downloads/en/DeviceDoc/35007b.pdf
>
> The output swing is VOL=0.6V (max) to VOH=3.8V (min) with a 4.5V
> supply. The absolute maximum output current for PORTB is 100mA.
> There is a weak pull-up mode but it can only source a few hundred
> micro-amps and your program is not selecting it. You need series
> resistors.

Another good reason to gaff the '84. The '62x ports can handle 200
mA (or 25 mA per pin) which means you can drive 8 leds at 25 mA
each. 

-- 
Best Regards,
Mike
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