描述 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 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.

特性 Features

? I2C to Parallel-Port Expander
? Open-Drain Interrupt Output
? Low Standby-Current Consumption of 10?μA?Maximum
? Compatible With Most Microcontrollers
? 400-kHz Fast I2C Bus
? Address by Three Hardware Address Pins for Use of up to Eight Devices
? Latched Outputs With High-Current Drive Capability for Directly Driving LEDs
? Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
? ESD Protection Exceeds JESD 22
? 2000-V Human-Body Model
? 200-V Machine Model
? 1000-V Charged-Device Model