VCCB

A-Side

B-Side

ICS

TCA980x

I

2C Slave

15

TCA9803

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SCPS267B – MARCH 2017 – REVISED FEBRUARY 2020

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9.4.1.2.2

IEXT-O

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.

Figure 14. IEXT-O Example