PCF8575TS (NXP) Remote 16-BIT I 2C AND SMBus I/O Expander with Interrupt Output MCP23017

PCF8575 Remote16-BIT I2C AND SMBus I/O Expander with Interrupt Output

 Features
• I2C to Parallel-Port Expander
• Open-Drain Interrupt Output
• Low Standby-Current Consumption of 10 μA Max
• Compatible With Most Microcontrollers
• 400-kHz Fast I 2C 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
• Current Source to VCC for Actively Driving a High at the Output
• 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 

Description
This 16-bit I/O expander for the two-line bidirectional bus (I2C) is designed for 2.5-V to 5.5-V VCC operation.

The PCF8575 is a silicon CMOS circuit. It provides general purpose remote I/O expansion for most microcontroller families via the two-line bidirectional bus (I2C-bus).

The device consists of a 16-bit quasi-bidirectional port and an I2C-bus interface. The PCF8575 has a low current consumption and includes latched outputs with high current drive capability for directly driving LEDs. It also possesses an interrupt line (INT) which can be connected to the interrupt logic of the microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I2C-bus. This means that the PCF8575 is an I2C-bus slave transmitter/receiver.

Every data transmission from the PCF8575 must consist of an even number of bytes, the first byte will be referred to as P07 to P00 and the second byte as P17 to P10. The third will be referred to as P07 to P00 and so on