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SCPS132C – JUNE 2006 – REVISED JUNE 2014 PCA9518 Expandable Five-Channel I2C HUB
1 Features 2 Description The PCA9518 is an expandable five-channel
bidirectional buffer for I2C and SMBus applications.
The I2C protocol requires a maximum bus
capacitance of 400 pF, which is derived from the
number of devices on the I2C bus and the bus length.
The PCA9518 overcomes this restriction by
separating and buffering the I2C data (SDA) and
clock (SCL) lines into multiple groups of 400-pF
segments. Any segment-to-segment transition sees
only one repeater delay. Each PCA9518 can
communicate with other PCA9518 hubs through a 4wire inter-hub expansion bus. Using multiple
PCA9518 parts, any width hub (in multiples of five)
can be implemented using the expansion pins, with
only one repeater delay and no functional
degradation of the system performance. 1 Expandable Five-Channel Bidirectional Buffer
400-kHz Fast I2C Bus …
