The TPT29548 is a 1:8 bidirectional translating I2C switch. The SCL/SDA upstream pair fans out to eight downstream channels. Any single SCn/SDn channel or combination of channels can be selected, determined by the programmable control register.

If one of the downstream I2C buses is stuck in a low state, then an active-low reset (̅RESET ̅̅̅̅̅̅̅̅̅) input helps the TPT29548 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 TPT29548. 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.

TPT29548 is available in TSSOP24 and QFN24L package, and is characterized from −40°C to +85°C.

Features

 Bidirectional Translator of 1:8 I2C Switch

 Active-Low Reset Input

 Three address terminals, allowing up to 8 devices on the I2C Bus

 Operating Power-Supply Voltage Range of 2.3 V to 5.5 V

 Allows Voltage-Level Translation Between 2.5 V, 3.3 V, and 5 V Buses

 Support Standard Mode and Fast Mode I2C Devices，0 to 400-kHz Clock Frequency

 Low RON Switches

 Latch-Up performance exceeds 200 mA per JESD 78

 ESD Protection Exceeds JESD 22

− 3.5 kV Human-Body Model

− 1.5 kV Charged-Device Model

Applications

 Servers/Storages

 Routers (Telecom Switching Equipment)

 Factory Automation

 Products With I2C Slave Address Conflicts (e.g., Multiple, Identical Temp Sensors)