5 DB CJMCU-9548 TCA9548 TCA9548A 1-8 I2C 8-utas többcsatornás bővítőkártya IIC modulfejlesztő kártya
5PCS CJMCU- 9548 TCA9548 TCA9548A 1-to-8 I2C 8 -way multi-channel Expansion Board IIC Module Development Board
Product Description
CJMCU- 9548 TCA9548A 1-to-8 I2C 8 -way multi-channel expansion board IIC module development board
You just found the perfect I2C sensor, them to your when you realize "Uh oh, this chip has a fixed I2C address, and from what I know about I2C, you can not have Two devices with the same same on the same SDA / SCL pins! "Are you out of luck? You would be, if you did not have this ultra-cool CJMCU-9548 1-to-8 I2C multiplexer!
Finally, a way to get up to 8 same-address I2C devices hooked up to one microcontroller - this multiplexer acts as a gatekeeper, shuttling the commands to the selected set of I2C pins with your command.
Using it is fairly straight-forward: the multiplexer itself is on I2C address 0x70 (but can be adjusted from 0x70 to 0x77) and you simply write a single byte with the desired multiplexed output number to that port, and bam - any future I2C packets Will get sent to that port. In theory, you could have 8 of these multiplexers on each of 0x70-0x77 addresses in order to control 64 of the same-I2C-addressed-part.
we put this nice chip on a breakout for you so you can use it on a breadboard with capacitor, and pullups and pulldowns to make usage a snap. Some header is required and once soldered in you can plug it into a Solder the chip is very easy to use it with any logic level.
Product Features
The adapter is connected to an I2C device with multiple identical addresses on the same I2C port on the main control board for normal communication and use.
There are 8 I2C interfaces on one expander, and there are eight bidirectional transfer switches that can be controlled by I2C bus. This means that after 1 expander is transferred, 8 identical addresses can be connected to the same I2C port. The device is also in normal use. The default address of this expander is 0x70, the address can be changed, and can be set within 0x70~0x77 according to your needs. In theory, 8 expanders can be cascaded in the address of 0x70~0x77, and each expander can connect 8 devices with the same address. This realizes the same I2C port and connects 64 devices with the same address and uses them normally. Very powerful!
Compatible with IIC bus and system management bus (SMBus), active low reset input, support for hot insertion, low standby current, no glitch during power-up, support for voltages between 1.8V, 2.5V, 3.3V and 5V buses Level shifting.
Depending on the contents of the programmable control registers, any single SCn/SDn channel or combination of channels can be selected. When a timeout or other improper operation occurs, the system master can reset the TCA9548A by asserting the /RESET input low. Similarly, a power-on reset deselects all channels and initializes the I2C/SMBus state machine. Reset and initialization can also be achieved by asserting /RESET and there is no need to power down the part. The switch has a turn-on gate so that the VCC pin can be used to limit the maximum high voltage through the TCA9548A. Limiting the maximum high voltage allows different bus voltages to be used on each channel pair so that 1.8V, 2.5V or 3.3V components can communicate with 5V components without any additional protection, for each channel, external pull-up resistors The device pulls up the bus voltage to the desired voltage level. All I/O pins are 5V withstand voltage.
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Product Parameters
Working voltage: 1.65V~5.5V
IIC clock frequency: 0 ~ 400KHz
Working environment temperature: -40 ° C ~ 85 ° C
Small board size: 31.5mm*21.4mm with two M3 mounting holes

Instructions For Use
The /RESET, SDA, SCL, A0, A1, and A2 pins on the small board are connected to the pull-up 10K resistor, no need to connect externally.
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