Your privacy is very important to us. When you visit our website, please agree to the use of all cookies. For more information about personal data processing, please go to Privacy Policy.


4-channel I2C Switch with Interrupt and Reset


The TPT29545 is a 1:4 bidirectional translating I2C switch. The SCL/SDA upstream pair fans out to four downstream channels. Any single SCn/SDn channel or combination of channels can be selected, determined by the programmable control register.

Four interrupt inputs (INT0 - INT3), which are designed as one for each of the downstream pairs. One interrupt (INT) output acts as an AND of the four interrupt inputs.

If one of the downstream I2C buses is stuck in a low

state, then an active-low reset (RESET) input helps the TPT29545 to recover. Pulling RESET low resets the I2C state machine and causes all the channels to be deselected, as does the internal power-on reset function.

The pass gates of the switches are constructed such that the VCC terminal can be used to limit the maximum high voltage, which will be passed by the TPT29545. This allows the use of different bus voltages on each pair, so that 2.5V, or 3.3V parts can communicate with 5V parts, without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O terminals are 5.5V tolerant.

TPT29545 is available in the TSSOP20 package, and is characterized from -40°C to +85°C.

  • Status


  • Rating


  • Drivers Per Package


  • Receivers Per Package


  • VCC(Min)(V)


  • VCC(Max)(V)


  • Data Rate(Max)(kBPS)


  • ICC (Max)(mA)


  • ESD HBM(kV)


  • IEC-61000-4-2 Contact(kV)


  • Operating Temperature Range(℃)

    -40 to +85

  • Package


TPT29545 Sample Request Form

Place Sample Order

Need Help? Contact Us.

TPT29545 Ordering Options

Place Order

Need Help? Contact Us.