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Monday, June 7, 2010

FTRIM on S08QD4
David E. migrated on Dec 31, 2013 at 11:00 AM
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4 comments

I have a number of boards that I use the S08QD4 on and I am not getting the specified accuracy. Most of the time, I do but about 30 to 40 percent of the time, the value is in the range of 0.0021 percent and 0.0044 percent in either plus or minus direction. Sometimes if I reprogram it several times the trim value will change and come in closer.

Is there a way that I can modify FTRIM only?

One of the frequencies that I need to output is 2280 Hz and sometimes, it is right on but as I said, frequently, it will be as low as 2270 or as high as 2289 or even 2290. it is mostly between 2285 and 2288 or 2272 and 2275 when it is out of spec.

Comment #1 David E. - migrated on Dec 31, 2013 at 11:00 AM

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QUOTE (CPUDave @ Jun 7 2010, 08:09 PM) [legacy comment]
I have a number of boards that I use the S08QD4 on and I am not getting the specified accuracy. Most of the time, I do but about 30 to 40 percent of the time, the value is in the range of 0.0021 percent and 0.0044 percent in either plus or minus direction. Sometimes if I reprogram it several times the trim value will change and come in closer.

Is there a way that I can modify FTRIM only?

One of the frequencies that I need to output is 2280 Hz and sometimes, it is right on but as I said, frequently, it will be as low as 2270 or as high as 2289 or even 2290. it is mostly between 2285 and 2288 or 2272 and 2275 when it is out of spec.


This is an update to add info: One one board, the calculated trim value was A2 and the output was 2272 Hz After reprogramming about 20 times it found a FTRIM value of A1 which changed the output frequency to 2285.5 Hz.

Comment #2 David E. - migrated on Dec 31, 2013 at 11:00 AM

Hello CPUDave,

What is the name and version number of the software that you are using?

What is the name and revision of P&E hardware interface that you are using?

What is the firmware version that this hardware interface is running?

We guarantee trim that we calculate to be within .2% of desired center frequency. Which frequency are you referring to in your previous post? 

Please attach exact FLASH programming algorithm that you are using to program device. The name of the file is 9S08QD4.s8p.

Best Regards,
Zahar
P&E

Comment #3 Zahar R. (PEMicro Staff) - migrated on Dec 31, 2013 at 11:00 AM

Hello Zahar,

My apologies for the delay.

QUOTE (Zahar Raskin @ Jun 11 2010, 12:31 PM) [legacy comment]
Hello CPUDave,

What is the name and version number of the software that you are using?
True-Time Simulator & Real-Time Debugger  V6.1 Build 7285

What is the name and revision of P&E hardware interface that you are using?
PE Micro USB Multilink Interface  Rev. C

What is the firmware version that this hardware interface is running?
5.72

We guarantee trim that we calculate to be within .2% of desired center frequency. Which frequency are you referring to in your previous post? 

Please attach exact FLASH programming algorithm that you are using to program device. The name of the file is 9S08QD4.s8p.

Best Regards,
Zahar
P&E

Comment #4 David E. - migrated on Dec 31, 2013 at 11:00 AM

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