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TCA9548APWR Description

The TCA9548APWR is an eight-channel bidirectional translating I2C switch. The slave devices SC0/SD0-SC7/SD7 receive the master SCL/SDA signal pair. You can choose from any of the eight downstream channels, or any combination of them.

The TCA9548APWR has an active-low RESET input that resets the state machine and aids recovery if one of the downstream I2C buses is stuck in a low state. The device’s state machine can also be reset by cycling the power supply, which is generally referred to as a power-on reset (POR). When you use the RESET function or a POR, all channels are deselected.

TCA9548APWR CAD Model

Symbol

Footprint

3D Model

TCA9548APWR Features

• I2C master pin savings, as each switch is enabled or isolated via I2C software.

• Voltage-level translation is supported for any bus voltage between 1.65 and 5.5 V, which is critical in mixed voltage I2C systems.

• Bidirectional translating switches with a range of 1 to 8

• Compatible with I2C and SMBus

• Input for active-low reset

• Three address pins allow up to eight TCA9548A devices to be connected to an I2C bus.

• Any mix of channels can be selected via an I2C Bus.

• Turn on the device with all switch channels turned off.

• Switches with low RON

• Transforms voltage levels between 1.8-V, 2.5-V, 3.3-V, and 5-V buses.

• No hiccups when turning on the power

• Allows for hot insertion

• Low standby power consumption

• 1.65 V to 5.5 V operating power supply voltage range

• Inputs that can withstand 5 volts

• Clock frequency ranges from 0 to 400 kHz

• According to JESD 78, class II, latch-up performance exceeds 100 mA.

• ESD protection is superior to JESD 22.

– Human-body model 2000-V (A114-A)

— Model 200-V Machine (A115-A)

— Charged-device model with 1000 volts (C101)

TCA9548APWR Functional Block Diagram

TCA9548APWR Circuit Diagram

The I2C multiplexer/switch shown in this diagram allows I2C systems to grow while keeping the two-wire bus basic. It also has the ability to do voltage translation and segment isolation.

Dual bidirectional translating switch controlled via I2C bus

TCA9548APWR Layout

For the TCA9548APWR‘s PCB layout, standard PCB layout concepts must be followed, but additional issues related to high-speed data transfer, such as matching impedances and differential pairs, are not an issue for I2C signal speeds. Ground-connected pins must have a low-impedance path to the ground plane in the form of big polygon pours and many vias, which is often found on an inner layer of the board. By-pass and decoupling capacitors are commonly used to manage the voltage on the VCC pin, with a bigger capacitor delivering more power in the event of a short power supply glitch and a smaller capacitor filtering out the high-frequency ripple.

In an application where voltage translation isn’t required, all VDPUX voltages and VCC may be at the same potential, and a single copper plane could connect all of the pull-up resistors to the right reference voltage. In an application where voltage translation is required, VDPUM and VDPU0 – VDPU7 may all be on the same layer of the board with split planes to separate unique voltage potentials.

To reduce overall I2C bus capacitance provided by PCB parasitics, data lines (SCn and SDn) must be as short as possible, and trace widths must be maintained to a minimum (for example, 5-10 mils depending on copper weight).

TCA9548APWR Applications

• I2C address conflicts are resolved.

• Isolation of the I2C bus

• Expansion of the I2C bus

• Dishwashers Routers are a type of router (telecom switching equipment)

• Automated manufacturing

• I2C slave products resolve conflicts (such as multiple, identical temperature sensors)

• Networking and communication

TCA9548APWR Package