Tca955x - I/O Expander device family

Summary

The TCA955X device family provides 8/16-bit, general purpose I/O expansion for I2C. The devices can be configured with polarity inversion and interrupts.

Device Family

The family contains the TCA9554 (8-bit) and the TCA9555 (16-bit) device. Both devices are compatible with 400kHz Bus speed.

• TCA9554: datasheet
• TCA9555: datasheet

Interrupt support

The Tca955x has one interrupt pin. The corresponding pins need to be connected to a master GPIO controller for this feature to work. You can use a GPIO controller around the MCP device to handle everything for you:

// Gpio controller from parent device (eg. Raspberry Pi)
_gpioController = new GpioController();
_i2c = I2cDevice.Create(new I2cConnectionSettings(1, Tca955x.DefaultI2cAddress));
// The "Interrupt" line of the TCA9554 is connected to GPIO input 11 of the Raspi
_device = new Tca9554(_i2c, 11, _gpioController, false);
GpioController theDeviceController = new GpioController(_device);
theDeviceController.OpenPin(1, PinMode.Input);
theDeviceController.RegisterCallbackForPinValueChangedEvent(1, PinEventTypes.Rising, Callback);

Binding Notes

The bindings includes an Tca955x abstract class and derived for 8-bit Tca9554 and 16-bit Tca9555.