Discovery board connections

Moamen Ayman · ‎2016-09-30

Posted on September 30, 2016 at 13:51

Hello, Why are pins PB6 and PB9 connected to VDD through 4.7KOhm resistors in STM32F4-Discovery board?

Amel NASRI · ‎2016-09-30

Posted on September 30, 2016 at 14:58

Hi ayman.moamen,

PB6 and PB9 are the I2C pins used to connect CS43L22. The 4.7Kohm pull-up resistors are required by the I2C (refer to

http://www.st.com/content/ccc/resource/technical/document/datasheet/ef/92/76/6d/bb/c2/4f/f7/DM00037051.pdf/files/DM00037051.pdf/jcr:content/translations/en.DM00037051.pdf

and

http://www.st.com/content/ccc/resource/technical/document/user_manual/70/fe/4a/3f/e7/e1/4f/7d/DM00039084.pdf/files/DM00039084.pdf/jcr:content/translations/en.DM00039084.pdf

for more details).

-Mayla-

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