Searching \ for '[SX] running at 50MHZ with 3V' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/ubicom/devices.htm?key=sx
Search entire site for: 'running at 50MHZ with 3V'.

Exact match. Not showing close matches.
PICList Thread
'[SX] running at 50MHZ with 3V'
2006\03\29@210349 by kwanhkn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, kwanhk wrote:

Hello everybody!

I have make a project using SX28 running at 50MHz with 3V power supply. Before I started the project, I tested that the SX28 can run with the Murata 50MHz ceramic resonator at 3V supply (using a simple flashing LED programme). During the development, I test everything with SX-Key debugger. However, as I completed the code for my project and tested it along, I found that it can't run properly at 3V. The power supply has to be more than 3.8V in order to make it run properly.


I have already used a 0.1uF ceramic and 47uF eletrolytic cap for power bypass.


What is the problem? What can I do to maintain the configuration of 50MHz, 3V and using a ceramic resonator. Or is there any solution that enable me to maintain 50MHz at 3V?

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=117785
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)

2006\03\29@223724 by George Herzogn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

Are all your parts really rated for that low a service?

Is your oscillator failing to run?
If so, it may be the oscillator settings, it may be the lack of a resistor in parallel with it .
The shift to a lower voltage may under-power the resonator with fine tuning.

My personal goal is to operate at 3.3volts.  
It seems that many ICs are tolerant to the range from 3.3 to 5.5 volts, so I can buy for either.  Also, if you consider diodes usually have 0.7volts of voltage drop, I suspect that lower voltage ICs must stay about an absolute minimum of about 4 x 0.7volts = 2.8volts.  You are getting quite close to that.  Being higher gives you more leeway as you actually have more power to correctly drive the system.

Trying to bounce off the absolute minimum may force you to sort and select parts from a larger population as production runs do vary.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=117785#m117796
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)

2006\03\30@041018 by beann/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

Please post your device settings.
You may need a BOR26 setting on the device line.
Or as Kramer has pointed out a different OSC setting.

Bean.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=117785#m117809
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)

2006\03\30@092441 by naten/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, nate wrote:

Kramer,
I have to ask, how in the world did you come up with:

"Also, if you consider diodes usually have 0.7volts of voltage drop, I suspect that lower voltage ICs must stay about an absolute minimum of about 4 x 0.7volts = 2.8volts."
Nate
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=117785#m117884
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)

2006\03\30@094856 by George Herzogn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

Can I erase that part, or does it have to stay?

First, I am not an EE.  My degree is actually in Fine Art.
Second, I am in Taiwan with a limited amount of knowledge and a few books.
Third, I have missed most of the evolution in computer electronics in the past 15 years due to being abroad.

Result, it is just a wild guess?
After saying that, I went shopping to some EEPROMs and see that CMOS technologies are well below that. 25XX256s can go below 2 volts at slower speeds.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=117785#m117886
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)


'[SX] running at 50MHZ with 3V'
2006\04\04@232807 by kwanhkn/a
flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, kwanhk wrote:

I am using the SX28AC/DP and the Murata 50MHz ceramic resonator delivered together with tool kit.
I have tried bith OSC1 and OSC2 other settings are:
internal feedback resistor enabled
BOROFF
TURBO
STACKX
WATCHDOG
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=117785#m119010
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)

2006\04\05@014917 by George Herzogn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

1. An additional external parallel resistor of 1 meg might get the Oscillator going if that is the problem.
2. Seems that BOROFF should allow it to run at the lower voltage.
3. I wonder if the WATCHDOG has some programing bug that causing this problem.
4. STACKX and TURBO are standard operation.

Could there be a faulty soldering of a capacitor [a solder bridge] that demands the extra voltage?

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=117785#m119021
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)

2006\04\05@015308 by George Herzogn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

1. An additional external parallel resistor of 1 meg might get the Oscillator going if that is the problem.
2. Seems that BOROFF should allow it to run at the lower voltage.
3. I wonder if the WATCHDOG has some programing bug that causing this problem.
4. STACKX and TURBO are standard operation.

Could there be a faulty soldering of a capacitor [a solder bridge] that demands the extra voltage?
Could there be a cold solder joint at the point of power supply that is demanding extra voltage.

These things might show up if you remove the ICs and trace all your power supply traces.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=117785#m119024
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)

2006\04\05@041525 by beann/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

Change "BOROFF" to "BOR26" and add "OSCHS2".
Bean.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=117785#m119030
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)

2006\04\05@075538 by kwanhkn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, kwanhk wrote:

Dear Bean,
Thank you very much for your advice!

After changing from "BOROFF" to "BOR26", the MCU can run at low as 3.2V.

But I don't understand why the brownout level affect the operation of my programme. Can you tell me why? Thanks a lot.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=117785#m119050
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)

2006\04\05@081511 by beann/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

It has to do with the rise time of the power supply. Without a BOR setting the processors tries to run at very low voltages and gets "hung-up" for some reason. Some power supplies work without the BOR setting, but I always use it to be safe.

Bean.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=117785#m119058
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)

2006\04\05@083429 by Coriolisn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote:

It has to do with the level of bypass capacitors used, they take time to charge, and the SX cant run at 50MHz at the lowest voltage it can run at (~2.7V), so if the normal waiting period before execution occurs and the voltage isnt high enough to permit 50 mhz operation the SX will hang. The BOR setting will force the SX into reset (plus some additional time) until the voltage levels rise enough to permit full 50mhz operation.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=117785#m119062
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)

More... (looser matching)
- Last day of these posts
- In 2006 , 2007 only
- Today
- New search...