SPRUIU1C July 2020 – February 2024 DRA821U , DRA821U-Q1
The noise filter is used to suppress any noise that is 50 ns or less in case of F/S operation modes, and any noise that is 10 ns or less in case of HS mode operation. The noise filter is always one period of the INTERNAL_CLK clock. This way, for HS mode operation (prescaler bypassed), the filter suppresses spikes of less than 10.4 ns.
For standard mode (for example, the I2C_PSC[7-0] PSC bit field = 4), the maximum width of suppressed spikes is 46.1 ns.
To ensure correct filtering, the prescaler must be programmed accordingly by the I2Ci.I2C_PSC[7-0] PSC bit field.