Unit EXT.IO
Description
EXT.IO is a GPIO Expander. With simple I2C commands it's possible to extend the GPIO pins for up to 8 extra GPIOs.
The EXT.IO Integrates the PCA9554PW chipset. This 8-bit I/O expander for the two-line bi-directional-bus (I2C) is designed for 2.3-V to 5.5-V VCC with Open-Drain Active-Low Interrupt Output operation.
It provides general-purpose remote I/O expansion for most micro controller families via the I2C interface.
I2C address by default is 0x27, unless changed manually.
It’s difficult to foresee the needs of your project from the start. EXT.IO is the perfect solution for expanding the number of IO. It allows you to add new features, logic, timing and sensing to already highly integrated designs.
Features
Include
- 1x EXT.IO Unit
- 1x Grove Cable
Specifications
| Resources | Parameter |
|---|---|
| I2C address | 0x27 |
| I/O Number of expansions | 8 |
| Net weight | 5g |
| Gross weight | 16g |
| Product Size | 32*24*11mm |
| Package Size | 67*53*12mm |
EasyLoader
- After downloading the software, double-click to run the application, connect the M5 device to the computer through the data cable, select the port parameters, click "Burn" to start burning. (For M5StickC burning, please Set the baud rate to 750000 or 115200)
PinMap
| M5Core(GROVE A) | GPIO22 | GPIO21 | 5V | GND |
|---|---|---|---|---|
| EXT.IO Unit | SCL | SDA | 5V | GND |
Schematic
With reference to the schematic diagram and the PCA9554PW data sheet, the Unit can modify the I2C address of the device by controlling the level combination of the A0~A2 pins. (The default address is 0x27, please check the datasheet for more information) There are three chip resistance welding positions reserved on the PCB of the Unit, which are A0-A2 (R6-R8), as shown in the following figure.
Related Link
- Datasheet - PCA9554PW
Example
Arduino
To get the complete code, please click here
