TCA9548ARGER I2C Switch: Diagram, Pinout, and Datasheet

The  I2C  bus can be used to control the TCA9548ARGER, which is an eight-channel Bidirectional Translating Switch. The upstream SCL/SDA pair splits into eight downstream pairs or channels. The contents of the programmable control register can be used to select any specific SCn/SDn channel or combination of channels. By asserting a low on the RESET input, the system master can reset the TCA9548ARGER in the event of a time-out or other inappropriate operation. The power-on reset, likewise, deselects all channels and resets the I2C/ SMBus  state machine. When you press RESET, the part is reset and initialized without having to turn it off.

The switches' pass gates are designed so that the VCC pin can be utilized to limit the highest high voltage that the TCA9548ARGER can pass. By limiting the maximum high voltage, multiple bus voltages can be used on each pair, allowing 1.8, 2.5, or 3.3V parts to connect with 5V parts without the need for additional protection.

The TCA9548ARGER Pinout is shown as follows.

The following figures are TCA9548ARGER Symbol, Footpoint and 3D Model.

Symbol

Footprint

3D Model

• 1-to-8 Bidirectional translating switches

• I2C Bus and  SMBus  compatible

• Active-low reset input

• Three address pins, allowing up to eight TCA9548A devices on the I2C bus

• Channel selection through an  I2C Bus , in any combination

• Power up with all switch channels deselected

• Low RON switches

• Allows voltage-level translation between 1.8-V, 2.5-V, 3.3-V, and 5-V buses

• No glitch on power up

• Supports hot insertion

• Low standby current

• Operating power-supply voltage range of 1.65 V to 5.5 V

• 5-V Tolerant inputs

• 0- to 400-kHz Clock frequency

• Latch-up performance exceeds 100 mA Per JESD 78, class II

• ESD Protection exceeds JESD 22

– ±2000-V Human-body model (A114-A)

– 200-V Machine model (A115-A)

– ±1000-V Charged-device model (C101)

• Green product and no Sb/Br

The following figure is TCA9548ARGER Functional Block Diagram.

Functional Block Diagram

The following figure shows an application in which the TCA9548ARGER can be used.

Typical Application

One or more data pull-up voltages, VDPUX, are used in a typical TCA9548ARGER application, one for the master device (VDPUM) and one for each of the configurable slave channels (VDPU0 – VDPU7). VDPUM = VDPUX = VCC if the master device and all slave devices are both powered by the same voltage. Additional design criteria must be considered when determining an adequate VCC voltage in an application where voltage translation is required.

The slave address of the TCA9548ARGER is controlled via the A0, A1, and A2 pins, which are hardware configurable. In some applications, these ports can be connected directly to GND or VCC.

If the application activates numerous slave channels at the same time, the total IOL from SCL/SDA to GND on the master side equals the sum of the currents through all pull-up resistors, Rp.

The TCA9548ARGER's pass-gate transistors are designed in such a way that the VCC voltage can be utilized to limit the maximum voltage that can be transmitted from one I 2C bus to the next.

Common PCB layout guidelines must be followed for the TCA9548ARGER, but extra considerations connected to high-speed data transfer, such as matching impedances and differential pairs, are not an issue at I 2C signal speeds. A dedicated ground plane on an inner layer of the board is typical, and ground-connected pins must have a low-impedance path to the ground plane in the form of large polygon pours and many vias. To manage the voltage on the VCC pin, by-pass and de-coupling capacitors are typically employed, with a larger capacitor providing more power in the event of a short power supply glitch and a smaller capacitor filtering out high-frequency ripple.

All VDPUX voltages and VCC might be at the same potential in an application where voltage translation isn't necessary, and a single copper plane could link all of the pull-up resistors to the proper reference voltage. VDPUM and VDPU0 – VDPU7 may all be on the same layer of the board with split planes to separate distinct voltage potentials in an application where voltage translation is necessary.

Data lines (SCn and  SDn ) must be as short as feasible, and trace widths must be kept to a minimum (for example, 5-10 mils depending on copper weight) to reduce overall I 2C bus capacitance added by PCB parasitics.

• Servers

• Routers (telecom switching equipment)

• Factory automation

• Products with I2C slave address conflicts (such as multiple, identical temperature sensors)

• Communications & Networking

The following figure is TCA9548ARGER Package.

Package

Texas Instruments Incorporated (TI) is a Texas-based technology company that designs and manufactures semiconductors and integrated circuits for electronic designers and manufacturers all over the world. It is one among the top ten semiconductor companies in the world based on sales volume. The company's major focus is analog chips and embedded processors, which account for more than 80% of the company's sales. Calculators, microcontrollers, and multi-core processors, as well as TI digital light processing technologies and education technology, are all manufactured by TI.