Description
TCA9548A 1-to-8 I2C Multiplexer Multi-channel Expansion Board 8 Channel Analog Multiplexer Development Board TCA9548A
Product Description
You just found the perfect I2C sensor, and you want to wire up two or three or more of them to your Arduino when you realize "Uhoh, this chip has a fixed I2C address, and from what I know about I2C, you cannot have two devices with the same address on the same SDA/SCL pins!" Are you out of luck? You would be, if you didn't have this ultra-cool TCA9548A 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.
Like all Adafruit breakouts, we put this nice chip on a breakout for you so you can use it on a breadboard with capacitors, and pullups and pulldowns to make usage a snap. Some header is required and once soldered in you can plug it into a
solderless-breadboard. The chip itself is 1.8V - 5V compliant so you can use it with any logic level.
solderless-breadboard. The chip itself is 1.8V - 5V compliant so you can use it with any logic level.
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Chip Features
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1
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1-to-8 Bidirectional translating switches
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2
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I2C Bus and SMBus compatible
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3
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Active-low reset input
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4
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Three address pins, allowing up to eight TCA9548A devices on the I 2C bus
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5
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Channel selection through an I 2C Bus, in any combination
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6
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Power up with all switch channels deselected
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7
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Low RON switches
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8
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Allows voltage-level translation between 1.8-V, 2.5-V, 3.3-V, and 5-V buses
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9
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No glitch on power up
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10
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Supports hot insertion
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11
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Low standby current
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12
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Operating power-supply voltage range of 1.65 V to 5.5 V
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13
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5-V Tolerant inputs
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14
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0- to 400-kHz Clock frequency
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15
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Latch-up performance exceeds 100 mA Per JESD 78, class II
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16
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ESD Protection exceeds JESD 22
– ±2000-V Human-body model (A114-A)
– 200-V Machine model (A115-A)
– ±1000-V Charged-device model (C101)
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Details Images
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