PCF8575官方文档
PCF8575引脚图：
PCF8575管脚功能：
PCF8575内部结构框图：
Description
This 16-bit I/O expander for the two-line bidirectional
bus (I2C) is designed for 4.5-V to 5.5-V VCC operation.
The PCF8575C provides general-purpose remote I/O
expansion for most microcontroller families via the I2C interface serial clock (SCL) and serial data (SDA).
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 canbe 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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pcf8575c.pdf
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