User's Manual

802.11b/g/n Wireless LAN WICED Module
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8 COMMUNICATIONS INTERFACE
8.1 I2C Interface Characteristics
The I2C bus interfaces can operate in multi-master and slave modes. They can support the
Standard- and Fast-modes. The I2C characteristics are described in below Table. If need
detail information, please refer to STM32F205RG I/0 or Interface manual.
I2C characteristics
1. Guaranteed by design, not tested in production.
2. fPCLK1 must be higher than 2 MHz to achieve standard mode I2C frequencies. It must be higher
than 4 MHz to achieve the fast mode I2C frequencies and it must be a multiple of 10 MHz in order
to reach the I2C fast mode maximum clock speed of 400 kHz
3. The maximum hold time of the Start condition has only to be met if the interface does not stretch
the low period of SCL signal.
4. The device must internally provide a hold time of at least 300ns for the SDA signal in order to
bridge the undefined region of the falling edge of SCL.