oscillator problem
I'm running an 18f1320 at 40mhz using a 10mhz crystal with PLL enabled.
The oscillator worked fine on a breadboard, but when I built a PCB for it, it worked for a while and then stopped working.
It works again for a little while if I melt the solder points for the oscillator with my soldering iron, but 20 mins later it stops working again.
Ive attached the PCB design. Anyone have ideas?
Last edited by Acetronics2; - 4th September 2010 at 10:55. Reason: reset original post
"I think fish is nice, but then I think that rain is wet, so who am I to judge?" - Douglas Adams
|
Melt the solder where?
But what if you try MCLR as an input? Or are you?
Dave
Always wear safety glasses while programming.
|
If I melt the solder that connects the crystal's pins to the pcb it works for a while. I assume it's because it's heating up the crystal?.Originally Posted by mackrackit
Currently I have MCLR enabled, and have a 10k resistor pulling it high.
"I think fish is nice, but then I think that rain is wet, so who am I to judge?" - Douglas Adams
|
Hi, Kamikaze
No decoupling capacitors anywhere ??? ... especially the magic 0.1µF between supply pins ???
Further ... having your config header could have helped, but surely "Top secret matter"
Waiting for more infos ...
Alain
PS : sorry for the first post ... I've hit the wrong button ...
************************************************** ***********************
Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
************************************************** ***********************
IF there is the word "Problem" in your question ...
certainly the answer is " RTFM " or " RTFDataSheet " !!!
*****************************************
|
Yes there is a 0.1uF cap close to the VCC pin from there to ground. There is also a 100uF cap at the point that the supply enters the board (board is supplied by an external 5v source).No decoupling capacitors anywhere ??? ... especially the magic 0.1µF between supply pins ???
Further ... having your config header could have helped, but surely "Top secret matter"
config:
Code:__CONFIG _CONFIG1H, _HSPLL_OSC_1H __CONFIG _CONFIG2H, _WDT_ON_2H & _WDTPS_512_2H __CONFIG _CONFIG3H, _MCLRE_ON_3H __CONFIG _CONFIG4L, _LVP_OFF_4L
"I think fish is nice, but then I think that rain is wet, so who am I to judge?" - Douglas Adams
|
Just to be sure, I just added another 0.1uF cap directly across the supply pins of the pic and it didnt help.
I've also turned off MCLR, but also no luck.
I've also just tried replacing the PIC but same issue.
I'm stumped.
"I think fish is nice, but then I think that rain is wet, so who am I to judge?" - Douglas Adams
|
Could you try
as a config , to be sure of.Code:@ __CONFIG _CONFIG1H, _IESO_OFF_1H & _FSCM_OFF_1H & _HSPLL_OSC_1H @ __CONFIG _CONFIG2L, _PWRT_ON_2L & _BOR_OFF_2L & _BORV_27_2L @ __CONFIG _CONFIG2H, _WDT_ON_2H & _WDTPS_32K_2H @ __CONFIG _CONFIG3H, _MCLRE_ON_3H @ __CONFIG _CONFIG4L, _DEBUG_OFF_4L & _LVP_OFF_4L & _STVR_OFF_4L @ __CONFIG _CONFIG5L, _CP0_OFF_5L & _CP1_OFF_5L @ __CONFIG _CONFIG5H, _CPB_OFF_5H & _CPD_OFF_5H @ __CONFIG _CONFIG6L, _WRT0_OFF_6L & _WRT1_OFF_6L @ __CONFIG _CONFIG6H, _WRTC_OFF_6H & _WRTB_OFF_6H & _WRTD_OFF_6H @ __CONFIG _CONFIG7L, _EBTR0_OFF_7L & _EBTR1_OFF_7L @ __CONFIG _CONFIG7H, _EBTRB_OFF_7H
Alain
************************************************** ***********************
Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
************************************************** ***********************
IF there is the word "Problem" in your question ...
certainly the answer is " RTFM " or " RTFDataSheet " !!!
*****************************************
Members who have read this thread : 0You do not have permission to view the list of names.
Posting Permissions
Bookmarks