4-Channel I2C Switch with Interrupt and Reset TPT29545

◉ 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 to INT3) 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 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 so that the VCC terminal can be used to limit the maximum high voltage which is passed by the TPT29545. This allows the use of different bus voltages on each pair, so that 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 terminals are 5.5 V tolerant.

◉ The TPT29545 is available in the TSSOP20 package and is characterized from –40°C to +85°C.