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Texas Instruments TCA9548A 8-Channel I2C Switch

Texas Instruments TCA9548A 8-Channel I2C Switch has eight bidirectional translating switches, which can be controlled through the I2C bus. The SDA/SCL upstream pair fans out to eight downstream channels or pairs. Any individual SDn/SCn channel or a combination of channels can be selected, which is determined by the contents of the programmable control register. These downstream channels can be used to resolve any I2C slave address conflicts. If eight identical digital temperature sensors are needed in the application, one sensor can be connected at each channel, 0 to 7.

The system master can reset the Texas Instruments TCA9548A during a time-out or improper operation by asserting a low in the RESET input. The power-on reset can also deselect all channels and initialize the SMBus/I2C state machine. Asserting a RESET causes the same reset and initialization without powering down the part. This feature would allow recovery if one of the downstream I2C buses were stuck in a low state.

Features

  • 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 1.8V, 2.5V, 3.3V, and 5V buses
  • There is no glitch on the power-up
  • Supports hot insertion
  • Low standby current
  • Operating power-supply voltage range of 1.65V to 5.5V
  • 5V tolerant inputs
  • 0 to 400kHz clock frequency
  • Latch-up performance exceeds 100mA Per JESD 78, class II
  • ESD protection exceeds JESD 22
    • ±2000V Human-body model (A114-A)
    • 200V Machine model (A115-A)
    • ±1000V Charged-device model (C101)

Applications

  • Servers
  • Routers (telecom switching equipment)
  • Factory automation
  • Products with I2C target address conflicts (such as multiple, identical temperature sensors)

Simplified Application Diagram

Application Circuit Diagram - Texas Instruments TCA9548A 8-Channel I2C Switch
View Results ( 5 ) Page
Part Number Datasheet Package/Case Description
TCA9548ARGERQ1 TCA9548ARGERQ1 Datasheet VQFN-24 Switch ICs - Various Automotive 8-channel 1.65- to 5.25v I2C/
TCA9548ADGSR TCA9548ADGSR Datasheet VSSOP-24 Switch ICs - Various 8-channel 1.65- to 5 .5-V I2C/SMBus swit
TCA9548AMRGER TCA9548AMRGER Datasheet VQFN-24 Switch ICs - Various 8-channel 1.65- to 5 .5-V I2C/SMBus swit
TCA9548APWR TCA9548APWR Datasheet TSSOP-24 Switch ICs - Various 8-Channel I2C Switch
TCA9548ARGER TCA9548ARGER Datasheet VQFN-24 Switch ICs - Various 8-CH I2C Switch w/ R eset
Published: 2017-06-01 | Updated: 2024-11-07