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HomeIoTAdafruit Teases New STEMMA QT Multiplexer, GPIO Growth Boards

Adafruit Teases New STEMMA QT Multiplexer, GPIO Growth Boards

Adafruit has teased designs for a pair of latest STEMMA QT breakout boards, one which works across the ongoing part shortages and one other that takes a preferred I2C multiplexer breakout however makes it a solder-free drop-in — creating what the corporate jokes is a “STEMMA QT [to] QTQTQTQTQTQTQTQT” board.

“We promote a useful TCA9584 [I2C] expander breakout,” Adafruit’s Phillip Torrone explains, pointing to a low-cost breadboard-friendly board which permits a number of units to share the identical I2C handle. “It is nice for whenever you need to join eight units of the identical I2C handle — however what if you wish to do to it with none breadboarding, utilizing STEMMA QT or Qwiic? Somebody emailed us about it, and we gotta admit, they’re kinda proper.”

The answer, in the event you hadn’t but guessed, is a board primarily based across the similar Texas Devices TCA9584 I2C multiplexer chip however within the STEMMA QT fashion — boasting a single solderless STEMMA QT port to the host microcontroller and eight for the multiplexed units, no soldering required.

“It [also] has a degree shift[er]/selector from Vin or 3.3V,” Torrone continues, “which signifies that in the event you’re interfacing to three.3V Qwiic boards from a 5V logic [Arduino] UNO it is going to do the conversion for you — however if you’d like that 5V energy handed via, you are able to do that as properly.”

Torrone has additionally unveiled a second new STEMMA QT board design, this time a 16-pin general-purpose enter/output (GPIO) expander — constructed to work round ongoing shortages of the Microchip MCP23017 utilized in Adafruit’s current board design. “[This chip] doesn’t have any handle choose pins (boo!),” Torrone warns, “but it surely does have two financial institution VCCIO pins so you need to use it for degree shifting (yay!).

“We’d additionally check out the [Semtech] SX1509,” Torrone provides, “which is a little more costly and requires 3.3V energy/logic however does has PWM [Pulse Width Modulation] and keypad scanning assist.”

Adafruit has not confirmed when it plans to place both board into manufacturing, nor when they are going to be out there to order on the shop.



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