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I2C multiplexer TCA9548A

SolderedElectronics·I2C-multiplexer-TCA9548A-breakout-hardware-design·CAD/V1.1.1/I2C multiplexer TCA9548A breakout.kicad_pcb

I2C multiplexer TCA9548A PCB layout, top view — open source board by SolderedElectronics
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About the I2C multiplexer TCA9548A PCB

I2C multiplexer TCA9548A is an open source PCB design by SolderedElectronics, published on GitHub under the TAPR-OHL-1.0 license. It is a 2-layer board measuring 54 × 38 mm, with 35 components from 8 distinct parts.

Other key parts include the TCA9548APWR. By type, the board carries 19 relays, 6 resistors, 3 jumpers, 2 capacitors and 1 IC.

It belongs with the dev boards & breakouts and sensors designs in this gallery.

From the project

Hardware design, BOM, gerbers and 3D files for I2C-multiplexer-TCA9548A-breakout designed by Soldered Electronics.

Have you ever found yourself wanting to connect more than one I2C device to a single controller and couldn’t because they have identical I2C addresses? There you have it, I2C multiplexer (I2C MUX) allows you to use up to 8 devices with the same address on the same bus! If we mention that TCA9548A, the IC on which this breakout is based, has three adjustable pins for the I2C address, which means a total of 8 possible addresses. We can reach 64 devices with the same address on the same bus. For example, it is possible to connect 64 BME680 sensors that are read by only one microcontroller.

I2C multiplexer TCA9548A, from the project README
From the project README

Main components on the I2C multiplexer TCA9548A

TCA9548APWR

I2C multiplexer TCA9548A bill of materials (BOM)

35 components, 8 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
TCA9548APWR
U1
4
HOLE_3.2mm
H1, H2, H3, H4
3
SMD_JUMPER
JP1, JP2, JP3
10
easyC-SMD
K1, K2, K6, K7, K10, K11, K14, K15 +2
9
HEADER_MALE_4X1
K3, K4, K5, K8, K9, K12, K13, K16 +1
1
100n
C1
1
10u
C2
6
10k
R1, R2, R3, R4, R5, R6

I2C multiplexer TCA9548A design files

The KiCad project lives in the SolderedElectronics/I2C-multiplexer-TCA9548A-breakout-hardware-design repository on GitHub; these links point at the commit this page was built from.

I2C multiplexer TCA9548A: common questions

How big is the I2C multiplexer TCA9548A PCB?

The I2C multiplexer TCA9548A measures 54 × 38 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the I2C multiplexer TCA9548A?

35 components, from 8 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the I2C multiplexer TCA9548A design files?

From the SolderedElectronics/I2C-multiplexer-TCA9548A-breakout-hardware-design repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the I2C multiplexer TCA9548A design in my own project?

Yes, under the terms of its TAPR-OHL-1.0 license, which SolderedElectronics chose for the repository.

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