Regarding the TCA9517: This device is interfacing with a Xilinx FPGA. Xilinx has gone on record saying its I2C controller does not implement glitch filtering (max 50 ns). Does the TCA9517 include any glitch filtering on the SDA and SCL lines? How about the TCA9517A?
https://www.xilinx.com/support/answers/61861.html
Thanks, David
Hey David,
Glitch filters are specified in the I2C standard to be in slave devices. As such slaves are required to have a 50ns glitch filter. This means devices that are not slaves do not have a glitch filter (as they are not required). TCA9517 is a buffer and not a slave device (it is not addressable) so that device would not work.
If you really wanted an integrated glitch filter then choosing one of our switches would work (addressable and has glitch filters of 50ns). An example would be TCA9543A which is a 2 channel switch.Note it is the main channels which have the glitch filter.
Alternatively the other approach would be to passively add a glitch filter. Please see the app note below on this:
Thanks,
-Bobby
