M5Stack Extend Serial I/O Unit PCA9554PW Port Expander

The EXT.IO Unit from M5Stack adds 8 inputs and outputs to a controller. It uses the PCA9554PW port expander and connects to Port A via I2C, the default address is 0x27.

Recommended Accessories:

• M5Stack Basic Core ESP32 IoT Development Kit V2.7
• M5Stack 1 to 3 HUB Unit

Features:

• 8 GPIO, each usable as input or output
• Logic level 2.3 to 5.5 V
• Address can be changed via the solder pads A0 to A2 (R6 to R8) (M5Stack)
• Connects to Port A (I2C), which the Basic Core itself also has
• 2 mounting holes for snap pins or screws

Application Examples:

• Additional buttons and LEDs
• Driving relays or displays when pins run short

Documentation:

• M5Stack documentation Unit EXT.IO
• Arduino example by M5Stack (GitHub)
• PCA9554 datasheet (PDF)

Technical Data:

• Manufacturer: M5Stack
• Manufacturer SKU: U011
• Chip: PCA9554PW
• Number of I/O: 8
• Logic level: 2.3 to 5.5 V
• I2C address: 0x27
• Connection: Grove HY2.0-4P, Port A (I2C)
• Pinout: black GND, red 5V, yellow SDA, white SCL
• On the M5Stack Basic: yellow G21, white G22
• Dimensions: 32 × 24 × 10.2 mm
• Weight: 16.6 g

Scope of Delivery:

• 1× M5Stack Extend Serial I/O Unit PCA9554PW Port Expander
• 1× Grove cable 20 cm
• 1× storage box