SCPS267B March 2017 – February 2020 TCA9803
The TCA980x has an active-high enable (EN) input with an internal pull-up to VCCA, which allows the user to select when the repeater is active. This can be used to isolate a badly behaved slave on power-up reset. The EN input must change state only when the global bus and repeater port are in an idle state. to prevent system or communication failures. When enable is a logic LOW while VCCB is powered on, the internal current source on B side is still enabled. The enable pin does not disable the internal current source.