TCA9548ARGER IC

Technical Specifications of TCA9548ARGER

Datasheet	TCA9548ARGER datasheet
Category	Integrated Circuits (ICs)
Family	Logic – Signal Switches, Multiplexers, Decoders
Manufacturer	Texas Instruments
Series	TCA
Packaging	Tape & Reel (TR)
Part Status	Active
Type	Bus Switch
Circuit	1 x 8:1
Independent Circuits	1
Current – Output High, Low	–
Voltage Supply Source	Single Supply
Voltage – Supply	1.65 V ~ 5.5 V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	24-VFQFN Exposed Pad
Supplier Device Package	24-VQFN (4×4)

TCA9548ARGER Description

The I 2C bus can be used to handle the TCA9548A’s eight switches that can translate in both directions. The SCL/SDA upstream pair splits into eight channels, or downstream pairs. Depending on what is in the programmable control register, any SCn/SDn channel or mix of channels can be chosen. I2C slave address conflicts can be solved by using these downstream routes. For example, if the program needs 8 identical digital temperature sensors, one sensor can be hooked up to each channel: 0-7.

By asserting a low on the restart input, the system master can restart the TCA9548A if it timed out or did something else wrong. In the same way, the power-on reset clears all channels and starts up the I2C/SMBus state machine. If you press restart, the same restart and initialization will happen without having to turn off the part. This makes it possible to fix things if one of the I2C buses further down gets stuck in a low state.

The switches’ pass gates are made so that the VCC pin can be used to limit the highest high voltage that the TCA9548A lets through. In order to employ unique bus voltages for each pair, the highest high voltage must be capped. This means that parts with 1.8 V, 2.5 V, or 3.3 V can talk to parts with 5 V without any extra protection. Pullup resistors on the outside of the circuit raise the voltage on the bus to the amount that each channel needs. All I/O pins are 5-V tolerant.

TCA9548ARGER Features

• 1-to-8 Translating switches that work both ways.
• I can use both 2C Bus and SMBus.
• Active-low input to reset.
• With its three address pins, the I2C bus can connect up to eight TCA9548A devices.
• Any mix of channels can be chosen with an I2C Bus.
• Turn on the power with no switch channels chosen.
• Switches with low RON.
• Allows voltage levels to be changed between buses with 1.8 V, 2.5 V, 3.3 V, and 5 V.
• No problem with powering up.
• Allows for hot entry.
• Low stream at rest.
• The voltage range of the power source is 1.65 V to 5.5 V. Tolerant sources range from 0 to 400 kHz.
• Per JESD 78, class II, the latch-up performance is more than 100 mA.

TCA9548ARGER Detailed Description

The TCA9548A is an 8-channel I2C switch that can work in both directions. The master’s SCL/SDA signal pair goes to eight slave channels, SC0/SD0-SC7/SD7. The eight available downstream channels can be used singly or in any combination. The device has an active-low restart input that can be used to restart the state machine and let the TCA9548A recover if one of the I2C buses downstream gets stuck in a low state. The device’s state machine can also be reset by cycling the device’s power source, VCC. This is also called a power-on reset (POR). When you use the RESET function or press the POR button, all channels are turned off.

The connections of the I 2C data path are handled by a single I 2C master device that can talk to multiple I 2C slaves by switching. After the slave address has been confirmed (which can be done with the A0, A1, and A2 pins), the chosen channels are written to or read from a single 8-bit control register. The TCA9548A can also be used to translate voltages. This allows for individual SCn/SDn pairs to operate on their own bus voltages, letting 1.8-V, 2.5-V, or 3.3-V parts talk to 5-V parts. To do this, pull-up resistors on the outside of the master and each child channel pull the bus up to the right voltage.

Feature Description

The TCA9548A is an 8-channel, bidirectional translating switch that can be used with both Standard-Mode (100 kHz) and Fast-Mode (400 kHz) I 2C lines. The single 8-bit control register of the TCA9548A turns on or off one of the chip’s eight I2C data-flow switch channels. Depending on how it is used, the TCA9548A can also change the voltage of the I2C bus. This lets parts that run on 1.8 V, 2.5 V, or 3.3 V connect with parts that run on 5 V. Also, the TCA9548A can be reset to normal operation using the RESET pin or a power-on reset, which happens when the device’s power is turned off and on again. This happens when the I2C bus link goes into a fault state.

TCA9548ARGER Device Functional Modes

● RESET Input

Active-low RESET inputs can recover from bus faults. The TCA9548A resets its registers and I 2C state machine and deselects all channels when this signal is low for tWL. A pull-up resistor connects RESET to VCC.

● Power-On Reset

The TCA9548A is reset until VCC reaches VPORR via an internal power-on reset. At this point, the resetting condition is no longer true, the TCA9548A registers and I2C state machine are defaulted, which are all 0. This means that none of the channels are chosen. To reset the gadget, VCC must be brought down below VPORF.

● Bus Transactions

Reading and writing records in the slave devices makes it possible to send and receive data to and from the slaves. The records of a slave hold data that the slave needs to send to its master, like how it is set up or a sample of its data. The master device uses these registers to tell the slave device what to do. Even though most I2C slaves have registers, it’s important to know that this isn’t true for all slave devices.

For devices with only one register, data can be put to that register without an address because it can be sent along with the slave address. Single-register devices like the TCA9548A need an I2C command set to work. Because the state of each channel can be shown by a single bit, only one register is needed. When writing to the slave address, the master only needs to leave out the register number.

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