STM32 HSE Cristal selection
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2010-01-11 10:32 PM
Posted on January 12, 2010 at 07:32
STM32 HSE Cristal selection
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2011-05-17 4:37 AM
Posted on May 17, 2011 at 13:37
Hello All,
I'm actually working on STM32F107 in an Ethernet application that requires a 25 Mhz crystal I used AN2867 as a reference for the quartz selection but I found some problem in following the indications about the selection of REXT. The STM3210C evaluation board is fitted with an HOSONIC quartz ( whose characteristics are summarized in table 9 at pag. 16 of AN2867) with a 220 Ohm REXT (R63). If I perform the gain margin check including REXT as indicated at page 13 of the AN2867, it turn out that the gain margin is 3.3 < 5 and so the oscillation startup criteria is not satisfied. Can someone help me about this ? Can someone provide some suitable pn in 3.2x2.5mm or 5x3.2 mm case ? Thanks in advance !!