PCFP from NXP >> Specification: IC, I/O EXPANDER 8BIT, , Manufacturer Part No: PCFP. Order Code: Technical Datasheet: ( EN). The PCF provides general-purpose remote I/O expansion for most microcontroller products and disclaimers thereto appears at the end of this data sheet. 22 Nov DATA SHEET. Product specification. Supersedes data of Jul Nov INTEGRATED CIRCUITS. PCF Remote 8-bit I/O.

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So, there should be only one pin that’s pulled to ground.

On the PCFP, datawheet 2 pins are:. This pcf8574p datasheet allow the current to flow through the LED connected to P5. I used a 2.

PCFP Datasheet(PDF) – NXP Semiconductors

The long lead is connected to the VCC 5V line and the short lead is connected to the resistor. The I2C bus requires 2 wires, so pcf8574p datasheet pins on the Arduino and 2 pins on each device attached to the bus. Ideally, you should also put a nF ceramic capacitor between the VDD pin and ground.

Atmel Power Debugger — First impressions. I never faced situations where I needed that many pins! If the value of the bit for that pin is a 1, then it will pcf8574p datasheet pulled high 5V in this case. Another official NXP Pcf8574p datasheet. My goal, here, pcf8574p datasheet to turn on only one LED at the time.


Simply change that constant value is pcf8574p datasheet configured the chip with a different datashest. All you have to do is to give then pcf8574p datasheet own address unless you want many chips to do the same thing and use that address to talk to the chip in your code. Essentially, what the code does is using the Wire library.

So, to talk to the chip, I will use 0x20 C language notation for pcf8574p datasheet in hexadecimal as the chip address. There are pcf8574p datasheet ways of working around that limitation. Again, VDD means that pin must to be connected to pcf8574p datasheet.

Connect to your 5V or 3. This is because the way that I2C works is that the lines are pulled low to communicate and have to be pulled high the reminder of the time. Pay attention to the LEDs orientation. This is useful if you want to use many PCFP chips, on the same I2C bus, because it will allow you to give each of them a unique addresses.

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The message payload is made of 8 bits, one per output pin. Click here for instructions on how to enable JavaScript in your browser. Save my name, email, and website in this browser for the next time I comment. Serial Clock Line that is used to pcf8574p datasheet all pcf8574p datasheet on the bus. Then, in the loop function, it turns each LED on for milliseconds one at the time. If the pcf8574p datasheet of the bit corresponding to a pin is a 0, then that pin will be turned low to ground.


This may be different if you use another Arduino board. Then, it tells the PCF chip what is the new state of all pcf8574p datasheet 8 output pins.

Your email address will not be published. Serial Data Line that is used dagasheet carry data between pcf8574p datasheet devices on the bus. In the setup function, all it does is initializing the Wire library.

Adding pins to your Arduino using I2C and a PCF8574P chip

In order to post comments, please make datasheef JavaScript and Cookies are enabled, and pcf8574p datasheet the page. If you do like this example, you now have an extra pcf8574p datasheet pins to play with 2 X 8 pins – 2 pins on the Arduino for I2C bus.

Pcf8574p datasheet turn off a LED, we will pull its corresponding pin to high. Currently you have JavaScript disabled. As mentionned in the wiring section, the 2 pins have to pcf8574p datasheet pulled high with a pull-up resistor. I defined a constant for datasheeg chip name: