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GPIO expander and Keypad Matrix controller - for matrix keypads - TCA8418 - STEMMA QT / Qwiic - Adafruit 4918
The Adafruit module is equipped with the TCA8418 chip working as a matrix keyboard controller. The chip has a total of 18 I / O pins in a 10 column and 8 row arrangement that can be arranged as a matrix of buttons on a total of 80 switches, or you can use any subset as an individual GPIO input or output. The controller has 10 bytes of FIFO to store the 10-element event queue. The Adafruit 4918 module can also be used as a standard GPIO pin expander, which extends the design possibilities by 18 ports.
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Product description: GPIO expander and Keypad Matrix controller - for matrix keyboards - TCA8418 - STEMMA QT / Qwiic - Adafruit 4918
The Adafruit module is equipped with the TCA8418 chip working as a matrix keyboard controller. The chip has a total of 18 I / O pins in a 10 column and 8 row arrangement that can be arranged as a matrix of buttons on a total of 80 switches, or you can use any subset as an individual GPIO input or output. The controller has 10 bytes of FIFO to store the 10-element event queue. The Adafruit 4918 module can also be used as a standard GPIO pin expander , which extends the design possibilities by 18 ports.
The manufacturer has also prepared a detailed user guide - check it out!
Elements included in the kit.
Botland is an official distributor of Adafruit electronics. These dependable American solutions cover sensors, controllers, Arduino shields, educational systems, smart building and a wide range of accessories. The Botland range holds original Adafruit products only.
All pins on the board have markings, which greatly facilitates prototyping.
Pinout description
- VIN - power pin from 3 V to 5 V DC
- 3Vo - 3.3V output from the voltage regulator
- GND - the ground of the system
- SCL - clock line of the I2C bus
- SDA - data line of the I2C bus
- C0 - C9 - GPIO pins or columns in the keyboard matrix. The column number corresponds to the pin number
- R0 - R7 - GPIO pins or rows in the keyboard matrix. The row number corresponds to the pin number
- INT - Open-drain - active-low interrupt output
- RST - reset pin
Technical Specifications
- Built-in chip: TCA8418
- Standby (idle) current consumption: 3 μA
- Supports 80 buttons using 18 GPIO pins
- Supports QWERTY keyboards and GPIO extensions
- Supports 1-MHz Fast Mode Plus I2C bus
- Storage memory: 10 bytes of FIFO
- Communication interface: I2C bus
- Interface address: 0x34 (default)
- Conclusions:
- solder pads (goldpin 2.54 mm strip is included in the set)
- STEMMA QT / Qwiic connectors
- Tile sizes: 35.5 x 17.7 x 4.6 mm
Kit contents
- GPIO expander and Keypad Matrix controller - for matrix keyboards - TCA8418 - STEMMA QT / Qwiic - Adafruit - 1 piece
- 1x16 goldpin strip - 2.54 mm raster - 2 pieces
An example of a connection diagram using Adafruit 4918.
Useful links
| Name | Value |
|---|---|
| Width | 8 cm |
| Height | 12 cm |
| Depth | 1 cm |
| Weight | 0.006 kg |
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30 days to return, without giving a reason
If the product does not meet your expectations, you have 30 days from receiving the parcel to withdraw from the contract. The product only has to be complete. The right of return belongs to consumers (a purchase unrelated to business activity).
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If the product turns out to be faulty, you can make a claim under the guarantee or the statutory warranty. We handle claims without delay, at the latest within 14 working days of receiving the report together with the goods.
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Instructions and documents
GPSR data
Product information
This product is a component intended for further assembly or prototyping. It is not a finished product within the meaning of the product safety regulations.
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