2016-09-30 04:51 AM
Hello, Why are pins PB6 and PB9 connected to VDD through 4.7KOhm resistors in STM32F4-Discovery board?
2016-09-30 05:58 AM
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 and for more details).-Mayla-To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.