12F675 | 16F628 | 16F84 | 16f877 | 16F877A | 16F88 | 18F458 | ADC | AVR | Bootloader | CAN | CCS | CRC | EAGLE | EEPROM | ICD | ICSP | IDE | JDM | LED | Macros | Microchip | MPLAB | PCB-CAD | PIC10F | Pic12f675 | PIC16F84 | PIC16F84A | PIC16F877 | PIC18 | PIC18F452 | PicBasic | PICC | PICSTART | PWM | RS-485 | RS232 | SMT | SPI | UART | USART | USB | Wireless | Wisp628 | Xilinx

Hi there

What would make my pic warm up? I have a pic on breadboard and its hardly off cold, but i have one in a circuit and its getting warm. I had the circuit on all night, but never noticed if it heated, but i have just turned it on now, and its warm. What reason would it warm up? Obvioulsy if i had a wiring fault, but still, i'm not to sure!

Thanks


(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )

Hey! Let me answer this one! Have you defined the inputs and outputs correctly? Cause if you use a pin as an input that is defined as a output, it will cause problems, especially if your using about six pins like this!
LOL, must concentrate more!

----- Original Message -----
From: Paul L
To: p...@yahoogroups.com
Sent: Saturday, April 21, 2007 4:00 PM
Subject: [piclist] PIC18F4331 getting hot

Hi there

What would make my pic warm up? I have a pic on breadboard and its hardly off cold, but i have one in a circuit and its getting warm. I had the circuit on all night, but never noticed if it heated, but i have just turned it on now, and its warm. What reason would it warm up? Obvioulsy if i had a wiring fault, but still, i'm not to sure!

Thanks



(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )

If you are running an 18F at the full 40MHz then it will get warm. Not
hot mind you, but definitely warm. If it is driving current on a lot of
its IO lines it will get a lot warmer.

DLC

Paul L wrote:
> Hi there
>
> What would make my pic warm up? I have a pic on breadboard and its
> hardly off cold, but i have one in a circuit and its getting warm. I had
> the circuit on all night, but never noticed if it heated, but i have
> just turned it on now, and its warm. What reason would it warm up?
> Obvioulsy if i had a wiring fault, but still, i'm not to sure!
>
> Thanks
>

--
-------------------------------------------------
Dennis Clark TTT Enterprises
www.techtoystoday.com
-------------------------------------------------



(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )

--- In p...@yahoogroups.com, "Paul L" wrote:
>
> Hey! Let me answer this one! Have you defined the inputs and outputs
correctly? Cause if you use a pin as an input that is defined as a
output, it will cause problems, especially if your using about six
pins like this!
> LOL, must concentrate more!
>
> ----- Original Message -----
> From: Paul L
> To: p...@yahoogroups.com
> Sent: Saturday, April 21, 2007 4:00 PM
> Subject: [piclist] PIC18F4331 getting hot
>
> Hi there
>
> What would make my pic warm up? I have a pic on breadboard and its
hardly off cold, but i have one in a circuit and its getting warm. I
had the circuit on all night, but never noticed if it heated, but i
have just turned it on now, and its warm. What reason would it warm
up? Obvioulsy if i had a wiring fault, but still, i'm not to sure!
>
> Thanks
>

And this is why it is important to put 330 ohm resistors in series
with all pins during the development/breadboarding process.

Richard



(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )

> --- In p...@yahoogroups.com, "Paul L" wrote:
>>
>> Hey! Let me answer this one! Have you defined the inputs and outputs
> correctly? Cause if you use a pin as an input that is defined as a
> output, it will cause problems, especially if your using about six
> pins like this!
>> LOL, must concentrate more!
>>
>> ----- Original Message -----
>> From: Paul L
>> To: p...@yahoogroups.com
>> Sent: Saturday, April 21, 2007 4:00 PM
>> Subject: [piclist] PIC18F4331 getting hot
>>
>> Hi there
>>
>> What would make my pic warm up? I have a pic on breadboard and its
> hardly off cold, but i have one in a circuit and its getting warm. I
> had the circuit on all night, but never noticed if it heated, but i
> have just turned it on now, and its warm. What reason would it warm
> up? Obvioulsy if i had a wiring fault, but still, i'm not to sure!
>>
>> Thanks
>> And this is why it is important to put 330 ohm resistors in series
> with all pins during the development/breadboarding process.

I have recently found out that these resistors can play hades with
serial connections - My serial LCD would not work with this series
resistor and I had to jumper it out!

DLC
> Richard



(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )