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leejok2003
Joined: 25 Dec 2008
Posts: 32
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| PIC restarting when connected with ENC28J60 |
 Posted: Tue Jan 20, 2009 11:44 am |
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Hi,
I am still stuck with the PIC18F4620+ENC28J60 TCPIP project, again. I have discover a problem:
1. When I programmed CCS TCPIP stack, example 10b, which have the ICMP function into 18F4620, without any power supply (power supply is source from PIC's 5v to 3.3v voltage regulator) to ENC28J60, the PIC seems working and display the message "CCS TCPIP STACK EXAMPLE10B...". But when i supply the power to ENC28J60, the PIC begins to reset and reset and stay in the loop. I have check pin 1 at PIC, the voltage is 5v and ENC is running at 3.3v. I have tried disconnect all the connection between PIC and ENC, but when I supply the power to ENC, the PIC begin turned reset like in a loop.
Does anyone have any idea??? I am building the CCS TCPIP development board without the LCD and EEPROM model. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Jan 20, 2009 2:47 pm |
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| Quote: | I have tried disconnect all the connection between PIC and ENC, but
when I supply the power to ENC, the PIC begin turned reset like in a loop. |
Look at the power supply voltage on the Vdd pins of the PIC.
The Vdd level is probably being pulled down below the BROWNOUT
voltage setting, and the PIC then resets. |
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asmallri
Joined: 12 Aug 2004
Posts: 1635
Location: Perth, Australia
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| Re: PIC restarting when connected with ENC28J60 |
| Posted: Tue Jan 20, 2009 3:48 pm |
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| leejok2003 wrote: | Hi,
I am still stuck with the PIC18F4620+ENC28J60 TCPIP project, again. I have discover a problem:
1. When I programmed CCS TCPIP stack, example 10b, which have the ICMP function into 18F4620, without any power supply (power supply is source from PIC's 5v to 3.3v voltage regulator) to ENC28J60, the PIC seems working and display the message "CCS TCPIP STACK EXAMPLE10B...". But when i supply the power to ENC28J60, the PIC begins to reset and reset and stay in the loop. I have check pin 1 at PIC, the voltage is 5v and ENC is running at 3.3v. I have tried disconnect all the connection between PIC and ENC, but when I supply the power to ENC, the PIC begin turned reset like in a loop.
Does anyone have any idea??? I am building the CCS TCPIP development board without the LCD and EEPROM model. |
Is your on-board power supply capable of delivering 200mA at 3.3 volts to the ENC28J60?
Do you have large power supply filter capacitors before and after the 3.3 volt regulator to supply the large transient currents produced by the ENC28J60?
_________________
Regards, Andrew
http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!! |
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leejok2003
Joined: 25 Dec 2008
Posts: 32
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| Posted: Wed Jan 21, 2009 2:12 am |
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| PCM programmer wrote: | | Quote: | I have tried disconnect all the connection between PIC and ENC, but
when I supply the power to ENC, the PIC begin turned reset like in a loop. |
Look at the power supply voltage on the Vdd pins of the PIC.
The Vdd level is probably being pulled down below the BROWNOUT
voltage setting, and the PIC then resets. |
How to check the BROWNOUT setting? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Jan 21, 2009 2:26 am |
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Look at your #fuses statement. Do you have any of these settings in it ?
| Code: | | BROWNOUT, BORV21, BORV28, BORV43, BORV46 |
Also look at the end of the .LST file for your project. It shows the Config
bits generated by the compiler. You can see what the settings are for
Brownout.
Also, tell us about your power supply circuit, as asmallri suggests.
Post the part numbers of the voltage regulator ICs used on your board. |
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leejok2003
Joined: 25 Dec 2008
Posts: 32
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| Posted: Wed Jan 21, 2009 2:50 am |
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Hi,
i have found something on my board when testing it:
If i would have connect a LED to the SO pin of the ENC28J60 chip, it can be ping sucessfully but with losses. It can stop the PIC restarting, but the communication is unstable. Any ideas? |
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leejok2003
Joined: 25 Dec 2008
Posts: 32
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| Posted: Wed Jan 21, 2009 3:12 am |
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| PCM programmer wrote: | Look at your #fuses statement. Do you have any of these settings in it ?
| Code: | | BROWNOUT, BORV21, BORV28, BORV43, BORV46 |
Also look at the end of the .LST file for your project. It shows the Config
bits generated by the compiler. You can see what the settings are for
Brownout.
Also, tell us about your power supply circuit, as asmallri suggests.
Post the part numbers of the voltage regulator ICs used on your board. |
i did't have those fuse in the source code. The voltage regulator IC i am using is LM3940 from NS, which outputs 1A. |
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leejok2003
Joined: 25 Dec 2008
Posts: 32
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| Re: PIC restarting when connected with ENC28J60 |
| Posted: Wed Jan 21, 2009 4:24 am |
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| asmallri wrote: | | leejok2003 wrote: | Hi,
I am still stuck with the PIC18F4620+ENC28J60 TCPIP project, again. I have discover a problem:
1. When I programmed CCS TCPIP stack, example 10b, which have the ICMP function into 18F4620, without any power supply (power supply is source from PIC's 5v to 3.3v voltage regulator) to ENC28J60, the PIC seems working and display the message "CCS TCPIP STACK EXAMPLE10B...". But when i supply the power to ENC28J60, the PIC begins to reset and reset and stay in the loop. I have check pin 1 at PIC, the voltage is 5v and ENC is running at 3.3v. I have tried disconnect all the connection between PIC and ENC, but when I supply the power to ENC, the PIC begin turned reset like in a loop.
Does anyone have any idea??? I am building the CCS TCPIP development board without the LCD and EEPROM model. |
Is your on-board power supply capable of delivering 200mA at 3.3 volts to the ENC28J60?
Do you have large power supply filter capacitors before and after the 3.3 volt regulator to supply the large transient currents produced by the ENC28J60? |
I have one with 0.47uF for input voltage and 22uF for output voltage |
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asmallri
Joined: 12 Aug 2004
Posts: 1635
Location: Perth, Australia
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| Posted: Wed Jan 21, 2009 7:05 am |
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| leejok2003 wrote: | Hi,
i have found something on my board when testing it:
If i would have connect a LED to the SO pin of the ENC28J60 chip, it can be ping sucessfully but with losses. It can stop the PIC restarting, but the communication is unstable. Any ideas? |
This implies there may be something wrong with your SPI bus implementation - the LED appears to be functioning as a pull-up resistor.
_________________
Regards, Andrew
http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!! |
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leejok2003
Joined: 25 Dec 2008
Posts: 32
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| Posted: Wed Jan 21, 2009 7:37 am |
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Hi asmallri,
If the situation is like that, how to fix it? Can you give me some idea of it? Thanks...
So sad that i only have 1 PIC working with the PING and i have forgot the configuration of it!!! Now trying back to bring back the solution so that i can go futher...hopefully  |
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asmallri
Joined: 12 Aug 2004
Posts: 1635
Location: Perth, Australia
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| Posted: Wed Jan 21, 2009 8:06 am |
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| leejok2003 wrote: | Hi asmallri,
If the situation is like that, how to fix it? Can you give me some idea of it? Thanks...
So sad that i only have 1 PIC working with the PING and i have forgot the configuration of it!!! Now trying back to bring back the solution so that i can go futher...hopefully |
If you have copied the circuit from elsewhere then I would check to see if you have copied it correctly. If it is your own circuit then post the schematic.
HOWEVER the most important piece of this is still your power supply circuitry including the type of power source, regulator circuit, power supply filter capacitors and decoupling capacitors. ANY of these can cause the problems you are describing.
_________________
Regards, Andrew
http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!! |
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leejok2003
Joined: 25 Dec 2008
Posts: 32
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| Posted: Wed Jan 21, 2009 8:29 am |
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The circuit bellow is which i am working on it:
1. The connection to RJ45 is not shown.
2.The power supply for ENC28J60 is shown which uses 5v input from 5v regulator.
3.The capacitor value is as shown.
4. The WOL' pin is not shown in the circuit.
[img]http://www.freeimagehosting.net/image.php?6d64b9c464.jpg[/img] |
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asmallri
Joined: 12 Aug 2004
Posts: 1635
Location: Perth, Australia
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| Posted: Wed Jan 21, 2009 9:00 am |
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| leejok2003 wrote: | The circuit bellow is which i am working on it:
3.The capacitor value is as shown.
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Hopefully you have an additional 100uF or similar capacitor on the input of the regulator which is not shown.
_________________
Regards, Andrew
http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!! |
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andrewg
Joined: 17 Aug 2005
Posts: 316
Location: Perth, Western Australia
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| Posted: Sun Jan 25, 2009 7:16 am |
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The ENC28J60 is supposed to have ceramic 0.1uF caps on all the VDD/VSS pairs, including the OSC, RX, TX, and PLL pairs (total five pairs). I can't see a 0.1uF bypass cap for your PIC, either.
Also, you should read the errata for the ENC28J60, there are some issues relating to the SPI bus speeds. I forget the details (I've misplaced my errata files), but I've always used one of the recommended workarounds which is to use the ENC CLKOUT to clock the PIC.
_________________
Andrew |
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asmallri
Joined: 12 Aug 2004
Posts: 1635
Location: Perth, Australia
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| Posted: Sun Jan 25, 2009 7:41 am |
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| andrewg wrote: | The ENC28J60 is supposed to have ceramic 0.1uF caps on all the VDD/VSS pairs, including the OSC, RX, TX, and PLL pairs (total five pairs). I can't see a 0.1uF bypass cap for your PIC, either.
Also, you should read the errata for the ENC28J60, there are some issues relating to the SPI bus speeds. I forget the details (I've misplaced my errata files), but I've always used one of the recommended workarounds which is to use the ENC CLKOUT to clock the PIC. |
For early rev ENC28J60s you had to have the SPI speed at 8MHz or above.
_________________
Regards, Andrew
http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!! |
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