ST7FLITE09Y0M6 / can the PLL by 4 be used at 5v to reduce power cosumption?
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‎2002-10-21 1:08 PM
Posted on October 21, 2002 at 22:08
ST7FLITE09Y0M6 / can the PLL by 4 be used at 5v to reduce power cosumption?
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‎2002-10-17 10:51 PM
Posted on October 18, 2002 at 07:51
My question concerns the ST7FLITE09 PLL. is it possible to use it (PLL*4) at 5v and which will be the oscillator (Fosc) accuracy ?
The specification mentions PLL*4 can be used between 2.4V and 3.3v but nothing concerning between 3.3v and 5.5v ? I need to reduce the consumption and one way should be to work at 4Mhz !!! thanks JPOptions
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‎2002-10-21 1:08 PM
Posted on October 21, 2002 at 22:08
I asked the exact same question few months ago to a ST tech support in France and the response was negative.
At 5V, your only options are either the PLL x 8 or no PLL. However, keep in mind that you can set the RC circuitry at a different calibration than the popular 1MHz. Per the datasheet (see rev 2.2 from Sept 2002, page 81/115), you can get down to 760kHz typ at 25C when RCCR = FFh. And 760kHz times 8 using the Pll gives you 6MHz. It is not the 4MHz but it is better than nothing Regards, Jojo