Hi Sean,
Yes. Checked everything like that - its in the right way, all I/O accounted
for but un-used, correct control, logic,etc

-----Original Message-----
From: Sean Breheny [mailto:shb7@CORNELL.EDU]
Sent: Monday, 8 May 2000 10:11
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: ?? Short ??


Hi John,

Did you check the circuit without the chip in?

Also, you might try taking a conductivity tester and checking the chip
itself to see if it is internally shorted.

Sean

At 10:04 AM 5/8/00 +1000, you wrote:
>Hi Tony and thanks for your resopnse,
>I/O that is not used is floating, only porta is configured as an output
port
>to toggle A0 on and off. The fault exists in reset state. Any ideas? I
guess
>I would throw them out if I was sure that I had done everything correctly
>and they still did'nt work. Chip is in the right way ( I made sure of that
>one from the start). Please advise.
>
>                                        John
>
>-----Original Message-----
>From: Tony Nixon [mailto:Tony.Nixon@ENG.MONASH.EDU.AU]
>Sent: Monday, 8 May 2000 9:47
>To: PICLIST@MITVMA.MIT.EDU
>Subject: Re: ?? Short ??
>
>
>John Orhan wrote:
>>
>> Hi PICster's,
>> I have had a harrowing experience yesterday with a couple of old
>PIC16C55s.
>> I hope someone has an explanation of sorts (more for my own peace of
mind)
>> for what I will convey. I was trying to program the '55 with standard
>> header,etc to do the LED-flash trick (before starting the main program)
>and
>> found upon power-up that the device was drawing almost 1A! Power supply
>> checked out, put the chip back in - same thing. I even tried another '55
>> chip with the same results. Has anyone heard of these devices shorting?
>> There are no tricks with what I'm doing....chip control ( reset, etc)
>logic
>> levels are in their right states. Please advise.
>>
>> John Orhan
>> Detection Systems / EDM Engineering Department
>> Ph: 02 96721233 (ext 219)
>> Fx: 02 9672 4093
>> Email: jorhan@edm.com.au
>
>Are the IO pins set as outputs and hard connected to 5V or GND?
>Is the chip in backwards?
>Tie MCLR low instead of high and see if the short still exists.
>Maybe they are duds.
>
>--
>Best regards
>
>Tony
>
>http://www.picnpoke.com
>mailto:sales@picnpoke.com
>
|
| Sean Breheny
| Amateur Radio Callsign: KA3YXM
| Electrical Engineering Student
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