This 16-bit I/O expander for the two-line bidirectional bus
(I2C) is designed for 4.5-V to 5.5-V VCC
The PCF8575C provides general-purpose remote I/O expansion for most microcontroller
families via the I2C interface serial clock (SCL) and serial data
The device features a 16-bit quasi-bidirectional input/output (I/O) port (P07–P00,
P17–P10), including latched outputs with high-current drive capability for directly driving LEDs.
Each quasi-bidirectional I/O can be used as an input or output without the use of a data-direction
control signal. At power on, the I/Os are in 3-state mode. The strong pullup to
VCC allows fast-rising edges into heavily loaded outputs. This device turns
on when an output is written high and is switched off by the negative edge of SCL. The I/Os should
be high before being used as inputs. After power on, as all the I/Os are set to 3-state, all of
them can be used as inputs. Any change in setting of the I/Os as either inputs or outputs can be
done with the write mode. If a high is applied externally to an I/O that has been written earlier
to low, a large current (IOL) flows to GND.
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