The PCA9548A I2C 8-Channel Multiplexer Development Board is the ideal solution for managing multiple I2C devices with identical addresses on a single bus. This board features 1-to-8 bidirectional translating switches, allowing seamless communication between your microcontroller and I2C devices. With an I2C address of 0x70 (default), you can easily select the desired output channel through simple commands. Designed with low standby current, 5V tolerant inputs, and hot insertion support, the PCA9548A ensures reliable and efficient operation in complex multi-device setups. Its compact size and advanced features make it perfect for I2C expansion in Arduino and microcontroller projects. Featured By RoboticsBD.
Product Images are shown for illustrative purposes only and may differ from the actual product.
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Features:
- 1-to-8 Multiplexing: Provides 8 bidirectional translating switches for I2C bus extension.
- I2C Bus Compatible: Fully compatible with I2C and SMBus protocols for seamless integration.
- Low Standby Current: Optimized for energy efficiency in low-power applications.
- 5V Tolerant Inputs: Supports 5V logic levels while maintaining compatibility with lower voltage devices.
- Hot Insertion Support: Allows devices to be added or removed without disrupting operations.
- Active-Low Reset: Ensures safe operation with power-up channels deselected by default.
- Robust Design: Latch-up performance exceeds 100 mA per JESD 78, Class II standards.
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Applications:
- I2C Device Multiplexing: Enables multiple devices with identical I2C addresses to share the same bus.
- Arduino and Microcontroller Projects: Ideal for expanding I2C capabilities in advanced projects.
- IoT Development: Perfect for integrating multiple sensors and peripherals in IoT systems.
- Embedded Systems: Enhances communication in multi-device embedded applications.
- Prototyping and Testing: Simplifies testing of multiple I2C devices in development environments.
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| General Specifications |
| Multiplexing Channels | 8 bidirectional translating switches |
| Default I2C Address | 0x70 |
| Reset Input | Active-low |
| Power-Up State | All channels deselected |
| Compatibility | I2C and SMBus |
| Input Voltage Tolerance | 5V |
| Latch-Up Performance | Exceeds 100 mA (JESD 78, Class II) |
| Standby Current | Low |
| Hot Insertion | Supported |
| Dimensions | 7 x 5 x 2 cm |
| Shipment Weight | 0.0043 kg |
| Shipment Dimensions | 7 x 5 x 2 cm |
Please allow 5% measuring deviation due to manual measurement.
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Documentation:
Pin Description :
Power Pins:
- Vin – this is the power pin. Since the sensor chip uses 3-5 VDC. To power, the board, give it the same power as the logic level of your microcontroller – e.g. for a 5V micro like Arduino, use 5V.
- GND – common ground for power and logic.
I2C Control-Side pins :
- SCL – this is the I2C clock pin for the chip itself, connect to your microcontrollers I2C clock line.
- SDA – this is the I2C data pin for the chip itself, connect to your microcontrollers I2C data line.
- RST – this is the reset pin, for resetting the multiplexer chip. Pulled high by default, connect to ground to reset
- A0 A1 A2 – these are the address selection pins for the multiplexer. By default, the multiplexer is at address 0x70 and these three pins are pulled low. Connect them to Vin to set the address to 0x71 – 0x77.
- A0 is the lowest-significant bit (if it is pulled high, it will increase the address by 1).
- A1 is the 2nd-lowest-significant bit (if it is pulled high, it will increase the address by 2).
- A2 is the 3rd-lowest-significant bit (if it is pulled high, it will increase the address by 4).
I2C Multiplexed-Side pins:
- SDx and SCx: There are 8 sets of SDx and SCx pins, from SD0/SC0 to SD7/SC7. These are the multiplexed pins. Each one is a completely separate I2C bus set. So you have 8 I2C devices with identical addresses, as long as they are on one I2C bus each.
- These pins do not have any pullups installed, so if you are using a chip or breakout without I2C pull-ups be sure to add them! Nicely, you can have Vin be 3.3V and have these pins pulled up to 5V (that is, they are 5V compliant).
Program :
We suggest using this little helper to help you select the port
#define TCAADDR 0x70
void tcaselect(uint8_t i) {
if (i > 7) return;
Wire.beginTransmission(TCAADDR);
Wire.write(1 << i);
Wire.endTransmission();
}
You can then call tcaselect(0) thru tcaselect(7) to set up the multiplexer.
Note that you if you happen to have I2C devices with I2C address 0x70, you will need to short one of the Addr pins on the TCA9548 breakout to Vin in order to make it not conflict. Given that you can have 0x70 thru 0x77, just find one that’s free and you’re good to go.
Package Includes:
1 x PCA9548A I2C 8 Channel Multiple Extensions Development Board
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