Product details

Addresses 8 Supply voltage (Max) (V) 5.25 Supply voltage (Min) (V) 1.65 Features Reset Pin Frequency (Max) (kHz) 400 Operating temperature range (C) -40 to 85 Number of channels (#) 8 TI functional safety category Functional Safety-Capable
Addresses 8 Supply voltage (Max) (V) 5.25 Supply voltage (Min) (V) 1.65 Features Reset Pin Frequency (Max) (kHz) 400 Operating temperature range (C) -40 to 85 Number of channels (#) 8 TI functional safety category Functional Safety-Capable
VQFN (RGE) 24 16 mm² 4 x 4
  • AEC-Q100 (grade 1): Qualified for automotive applications
  • Functional Safety-Capable
  • 1-to-8 Bidirectional translating switches
  • I2C Bus and SMBus compatible
  • Active-low reset input
  • Three address pins, allowing up to eight TCA9548A-Q1 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 quiescent current
  • Operating power-supply voltage range of 1.65 V to 5.25 V
  • 5 V tolerant Inputs
  • 0 to 400 kHz clock frequency
  • Latch-up performance exceeds 100 mA per JESD 78, class II
  • AEC-Q100 (grade 1): Qualified for automotive applications
  • Functional Safety-Capable
  • 1-to-8 Bidirectional translating switches
  • I2C Bus and SMBus compatible
  • Active-low reset input
  • Three address pins, allowing up to eight TCA9548A-Q1 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 quiescent current
  • Operating power-supply voltage range of 1.65 V to 5.25 V
  • 5 V tolerant Inputs
  • 0 to 400 kHz clock frequency
  • Latch-up performance exceeds 100 mA per JESD 78, class II

The TCA9548A-Q1 device has eight bidirectional translating switches that can be controlled through the I2C bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register. These downstream channels can be used to resolve I2C target address conflicts. For example, if eight identical digital temperature sensors are needed in the application, one sensor can be connected at each channel: 0-7.

The system controller can reset the TCA9548A-Q1 in the event of a time-out or other improper operation by asserting a low in the RESET input. Similarly, the power-on reset deselects all channels and initializes the I2C/SMBus state machine. Asserting RESET causes the same reset and initialization to occur without powering down the part. This allows recovery should one of the downstream I2C buses get stuck in a low state.

The pass gates of the switches are constructed so that the VCC pin can be used to limit the maximum high voltage, which is passed by the TCA9548A-Q1. Limiting the maximum high voltage allows the use of different bus voltages on each pair, so that 1.8 V, 2.5 V or 3.3 V parts can communicate with 5 V parts, without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5 V tolerant.

The TCA9548A-Q1 device has eight bidirectional translating switches that can be controlled through the I2C bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register. These downstream channels can be used to resolve I2C target address conflicts. For example, if eight identical digital temperature sensors are needed in the application, one sensor can be connected at each channel: 0-7.

The system controller can reset the TCA9548A-Q1 in the event of a time-out or other improper operation by asserting a low in the RESET input. Similarly, the power-on reset deselects all channels and initializes the I2C/SMBus state machine. Asserting RESET causes the same reset and initialization to occur without powering down the part. This allows recovery should one of the downstream I2C buses get stuck in a low state.

The pass gates of the switches are constructed so that the VCC pin can be used to limit the maximum high voltage, which is passed by the TCA9548A-Q1. Limiting the maximum high voltage allows the use of different bus voltages on each pair, so that 1.8 V, 2.5 V or 3.3 V parts can communicate with 5 V parts, without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5 V tolerant.

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Type Title Date
* Data sheet TCA9548A-Q1 Automotive 8-Channel I2C Switch with Reset datasheet (Rev. B) 08 Apr 2021
Functional safety information TCA9548A-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA 22 Feb 2021
Application note I2C Solutions for Hot Swap Applications 31 Jan 2020

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