Qwiic Mux PCA9548A -I2C 멀티플렉서
(Qwiic Mux - PCA9548A)
개요
- Qwiic Mux -PCA9548A는 같은 I2C 주소를 가지고 있는 여러개의 장치 및 다른 버스 전압(2.8V, 3.3V, 5V)를 가진 장치가 서로 통신을 할 수 있게 하여 주는 제품입니다.
- PCA9548A는 사용하기 쉬운 I2C 멀티플렉서로 같은 주소를 가진 I2C 디바이스를 최대 8개까지 통신할 수 있게하여 줍니다.
- 데이지 체인형식으로 연결이 가능하여 8개를 연결하면 총 64개의 장치를 사용할 수 있습니다.
- 이 제품은 I2C 주소가 고정되어 있는 동일한 주소의 I2C 장치를 여러개를 사용하고자 할때 용이 하게 사용할 수 있습니다.
- 보드에는 두개의 레귤레이터가 있어서 5V나 3.3V 전원으로 동작할 수 있으며, 정류된 3.3V와 2.8V를 만들어 줄 수 있습니다.
- 보드 뒷면의 점퍼로 메인 버스 전압을 설정할 수 있습니다.
특징
- Works with popular platforms including Arduino, Photon, Raspberry Pi, Tessel 2, ESP32/ESP8266, and Edison
- 9 ports with Qwiic connectors and 0.1" footprints
- Four 3.3V buses, two 2.8V buses, two 5V buses
- On board 3.3V (600mA) and 2.8V (150mA) regulation
- Bus power indicator LEDs
- Pull-up resistors and decoupling caps provided on all buses
- Address jumpers to enable up to eight shields operating at the same time
문서
- Schematic
- Eagle Files
- PCA9548A Datasheet, TCA9548A Datasheet
- Arduino example sketches showing how to talk to two MMA8452Q accelerometers simultaneously
- To get the latest files please visit the GitHub repo
- How do I use the Qwiic Mux? Connect your platform of choice (Arduino, Photon, Raspberry Pi, etc) to the Main connector over I2C. Connect your device to either the 2.8V, 3.3V, or 5V bus. As you can see from the photo, Qwiic cables make this easy but you can solder male headers or wires to each port as well.
How do I control the PCA9548A? It's surprisingly easy. Over I2C, you tell the device which port you want to talk to, for example port 3. After that, whatever I2C traffic happens gets sent to port 3. By switching back and forth between ports, it's easy to talk to multiple devices that have the same address!
What is the difference between the PCA9548A and TCA9548A? Very little. PCA is made by NXP, TCA is made by TI. PCA can operate from 2.3 to 5.5V, TCA can operate from 1.65 to 5.5V. Everything else is identical.
Issues with this version: SparkX moves fast and we'd rather get something into the wild then let it languish in the lab. The top silkscreen is correct but the rear silkscreen incorrectly identifies ports 0, 1, and 2 as 5V. Ports 0 and 1 are 3.3V, Port 2 is 2.8V.
The Qwiic system enables fast and solderless connection between popular platforms and various sensors and actuators. You can read more about the Qwiic system here. We carry 200mm, 100mm, 50mm, and breadboard friendly Qwiic cables.