4 Channel I2C Multiplexer Breakout
![]() Cliquer pour agrandir |
![]() |
4 Channel I2C Multiplexer Breakout
The 4 Channel I2C Multiplexer is basically a digital switch for up to 4 I2C devices. It uses a PCA9544A multiplexer IC to allow one of four devices to be connected to the I2C bus at one time, whilst disconnecting the other three. This is really useful for I2C devices that have a fixed I2C address.
An example of such a device is the BMP180 Barometric Pressure Sensor which has a single fixed I2C address (0xEE). Therefore you can only have one such device connected to your I2C bus. The I2C Multiplexer board lifts this limitation allowing you to have 4 such devices (or a mix of other devices) connected to the I2C bus.
The Multiplexer board itself is controlled via the I2C bus so no additional microcontroller pins are required.
4 Channel I2C Multiplexer Breakout Features
- PCA9544A I2C Multiplexer IC
- 1-of-4 bidirectional translating I2C multiplexer
- I2C-bus interface logic; compatible with SMBus
- 4 active LOW interrupt inputs (pullup resistors on board)
- Active LOW interrupt output
- 3 address pins allowing up to 8 Mutiplexer boards on the I2C-bus (pull down resistors on board)
- I2C Channel selection via I2C-bus
- Power-on with all multiplexer channels deselected
- 0 Hz to 400 kHz clock frequency
- Logic level translation between 1.8 V, 2.5 V, 3.3 V and 5 V buses
- Onboard 3.3V Voltage Regulator for powering 3.3V I2C devices (default)
The multiplexer chip has in-built logic level conversion from the supply voltage / master I2C input to the I2C channel voltage. The default configuration for the board is
- Supply and Master I2C Voltage 3.3V or 5V
- I2C device voltage 3.3V
Documents
PCA9544A Datasheet
Multiplexer Breakout Schematic
Example Arduino Sketch with 4x MPL3115A sensors
![]() MPL3115A2 Altitude/Pressure/Temp Sensor Breakout MPL3115A2 7,91€ ![]() |
![]() MinIMU-9 V5 Gyro, Accelerometer, and Compass (LSM6DS33 and LIS3MDL) MINIMU-9-V5 15,11€ |
![]() SparkFun 9 Degrees of Freedom IMU Breakout - LSM9DS1 SEN-13284 23,02€ |
![]() CMPS11 - Tilt Compensated Compass Module CMPS11 30,51€ |
![]() 9DOF ITG3205 ADXL345 HMC5883L Sensor Breakout 9DOF-BB 27,49€ |
![]() 3-Axes Accéléromètre Capteur - ADXL345 ADXL345 17,27€ |
![]() MS5611 High Resolution Atmospheric Pressure Module MS5611 12,95€ |
![]() Triple Axis Magnetometer Breakout - MAG3110 MAG3110 13,67€ |
![]() MLX90614 - Infrared Thermometer MLX90614 17,99€ |
![]() MMA8452Q - Triple Axis Accelerometer Breakout SEN-12756 10,79€ |
![]() ADXL345 3-Axes Accéléromètre Capteur ADXL345-BB 12,95€ ![]() |
![]() I2C Bi-directional Logic Level Converter LOGIC2 3,60€ ![]() |
Votre avis : N.B. : Le HTML n'est pas pris en charge !
Évaluation : Mauvais Bon
Saisir le code ci-dessous :