The CJMCU PCA9548A I2C 8-Channel Multiple Extensions Development Board is a versatile module designed to expand the I2C communication capabilities of microcontrollers. It allows a single I2C master device to communicate with up to eight I2C slave devices, even if they share the same address, by dynamically switching between channels via I2C commands.

Features of CJMCU PCA9548A I2C 8-Channel Multiple Extensions Development Board:

1. 1-to-8 Bidirectional Translating Switches enables communication with up to eight I2C devices individually.
2. I2C Address is default address is 0x70; can be adjusted to 0x70–0x77 using A0, A1, A2 pins.
3. Supports hot insertion that means devices can be connected or disconnected without powering down the system.
4. Low standby current for efficient power consumption during idle states.
5. 5V Tolerant Inputs: Compatible with both 3.3V and 5V logic levels.
6. Active-Low reset Input that allows resetting the multiplexer to its default state.
7. Power-Up with all channels deselected which ensures no unintended communication upon startup.
8. I2C Bus and SMBus compatible that helps in broad compatibility with various communication protocols.
9. Latch-Up performance exceeds 100 mA per JESD 78, Class II which ensures robust operation under various conditions.

Specifications of CJMCU PCA9548A I2C 8-Channel Multiple Extensions Development Board:

• IC: PCA9548A (Texas Instruments)
• Operating Voltage: 2.3V to 5.5V
• Logic Level Compatibility: 3.3V and 5V systems
• Number of Channels: 8 independently controlled I2C channels
• I2C Address: Default 0x70; configurable via A0, A1, A2 pins to addresses 0x70–0x77
• Communication Interface: Standard I2C
• Multiplexed-Side Pins: 8 sets (SD0/SC0 to SD7/SC7) for connecting I2C slave devices
• PCB Material: FR-4
• Mounting: Onboard header pins with mounting holes

Package Includes:

1 × CJMCU PCA9548A I2C 8-Channel Multiple Extensions Development Board

2 × 12-pin male header strips (unsoldered)