ST STM32F301 6 Series Reference Manual page 653

RM0366
Item
Filtering capacity
Benefits
Drawbacks
1. Maximum duration of spikes that the filter can suppress
Caution: The filter configuration cannot be changed when the I2C peripheral is enabled.
I2C timings
To ensure correct data hold and setup times, the corresponding timings must be configured
through the PRESC[3:0], SCLDEL[3:0], and SDADEL[3:0] bitfields of the I2C_TIMINGR
register.
The STM32CubeMX tool calculates and provides the I2C_TIMINGR content in the I2C
configuration window.
Table 84. Comparison of analog and digital filters
Analog filter
(1)
≥ 50 ns
Available in Stop mode
Filtering capacity
variation with
temperature, voltage, and
silicon process
RM0366 Rev 5
Inter-integrated circuit interface (I2C)
Digital filter
One to fifteen I2CCLK periods
– Programmable filtering capacity
– Extra filtering capability versus I²C-bus
specification requirements
– Stable filtering capacity
Wake-up from Stop mode on address match not
supported when the digital filter is enabled
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