SCPS267B March 2017 – February 2020 TCA9803
IEXT-O is an unintentional current from the TCA980x's internal current source that is external. Leaking ESD cells are a common contributor to leakage current. This type of input leakage may not exceed the IEXT-O maximum spec, or else the TCA980x can interpret this excessive current as an external device transmitting a low, causing the bus to latch. It is important to consider the total sum of I2C slave device's leakage to ground, and that it does not violate IEXT-O. An example showing a typical IEXT-O leakage path through an ESD cell is shown in Figure 14.