PCF8575 I/O Expander : Pinout, Schematic and Datasheet

The PCF8575  is a remote16-BIT I2C and SMBus I/O expander with interrupt output. Which provides general-purpose remote I/O expansion for most microcontroller families by way of the I2C interface [serial clock (SCL), serial data (SDA)]. 

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 high. In this mode, only a current source to VCC is active. On board 3.3V level converter circuit, if you donot solder VCC-VDD pad, the PCF8575 level is 3.3V. If you solder it, the level will be the same with VCC. 

The module connects via the I2C bus to your microcontroller and offers I2C address selection by closing solder jumpers on the bottom side (base address is 0x20). You can either use it on 3.3V or 5V thanks to its on-board LDO and level shifter. 

The VDD pin is the power supply for 5V, the VCC pin is the 3.3V output voltage of the LDO. If you use it as 5V device, you supply 5V on VDD. If you use it as 3.3V device, you supply 3.3V to the VCC pin and close the solder jumper VCC-VDD on the bottom side. In a mixed mode, with 5V GPIO ports but connected to a 3.3V microcontroller, you supply 5V to VDD but leave the VCC-VDD jumper open.

Footprint

3D Model

•  Low Standby-Current Consumption of 10 µA Max

•  I²C to Parallel-Port Expander

• Open-Drain Interrupt Output

• 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

• Current Source to VCC for Actively Driving a high at the output

• Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II

• Working voltage: 2.5 - 5.5VDC

• Working current: 100mA(MAX)

• I²C address: 0x20(default),can be modified by soldering A1 and A2 selection pads.

• 16 individually addressable pins.

• Each pin configurable for input or output pin for input change interrupt.

• Arduino available library: PCF8575

• Suitable for Arduino UNO R3 and other MCU to control simple relay, buzzer, button, led.

• ESD Protection Exceeds JESD 22

– 2000-V Human-Body Model (A114-A)– 200-V Machine Model (A115-A)

– 1000-V Charged-Device Model (C101)

Texas Instruments PCF8575PW technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments PCF8575PW.

● Used in Telecom Shelters: Filter Units

● Used in Servers

● Used in Routers (Telecom Switching Equipment)

● Used in Personal Computers

● Used in Personal Electronics

● Used in Industrial Automation

● Used in Products with GPIO-Limited Processors

Texas Instruments (TI) is an American technology company headquartered in Dallas, Texas, which designs and manufactures semiconductors and various integrated circuits, and sells them to electronic designers and manufacturers worldwide. It is one of the top 10 semiconductor companies in global sales. The company focuses on the development of analog chips and embedded processors, which account for more than 80% of its revenue. TI also produces TI digital light processing technology and educational technology products, including calculators, microcontrollers and multi-core processors. As of 2016, the company has 45,000 patents worldwide.