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 Post subject: ratio between vcc and vccq
PostPosted: January 23rd, 2018, 10:07 
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Joined: March 5th, 2012, 11:17
Posts: 37
Location: argentina
Hello Vnr users, how are you all ?

I have a case is a pendrive and the memorie is very damage after all night trying to correct one dump only correct half with 74% of error. Now the voltages in the reader are settings in vcc 2.3 V and Vccq 3.3 V. And now i am thinking to low the voltage to 1.8v of vcc but is necessary low the Vccq to and in a specific ratio between the 2 voltages.

Thanks very much
My best regards


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 Post subject: Re: ratio between vcc and vccq
PostPosted: January 23rd, 2018, 11:35 
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Joined: December 4th, 2012, 1:35
Posts: 3133
Location: Adelaide, Australia
depends on the chip. I wouldn't go lower thank 2.2 for vcc... never seen good results lower. Maybe read retry needs to be tinkered with, or vcc applied to other pins. have you tried lowering vccq and raising slightly vcc

You should add the chip part number and ID.

Are the pins nice and clean?

cheers


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 Post subject: Re: ratio between vcc and vccq
PostPosted: January 26th, 2018, 11:10 
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Joined: March 5th, 2012, 11:17
Posts: 37
Location: argentina
HaQue thanks very much to answer my question!!!!!


is possible improve the reading lowering the vccq and raise up vcc ? i belive the reading impreve when the voltage of the core are lower

Thanks very much

my best regards


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 Post subject: Re: ratio between vcc and vccq
PostPosted: January 26th, 2018, 12:12 
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Joined: December 4th, 2012, 1:35
Posts: 3133
Location: Adelaide, Australia
Yes you can try that too. just don't raise VCC too much.

You should add the chip part number and ID to this post.


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 Post subject: Re: ratio between vcc and vccq
PostPosted: January 26th, 2018, 12:52 
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Joined: March 5th, 2012, 11:17
Posts: 37
Location: argentina
the id is 983A98A376
and the part number is fd32b08uch1-49

thanks very much HaQue
my best regards


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