The datasheet mentions multiple TCA9517s can be connected in series
as long as the A side is connected to the B side.
I guess that TCA9517 cannot be connected A-side to A-side in series.
What is the reason?
Thanks in advance.
takishin
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Takishin,
Page 2 of the datasheet says, "This type of design on the B side prevents it from being used in series with the PCA9515A and another TCA9517 (B side). This is because these devices do not recognize buffered low signals as a valid low and do not propagate it as a buffered low again."
An A-side to A-side connection is allowed, but doing so would prevent you from connect more than 2 in series.
This is why A-side to B-side connections are shown in Figure 8 on the datasheet.