The TPT29545 is a 1:4 bidirectional translating I 2C 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 I 2C buses is stuck in a low state,then an active-low reset(RESET)input helps the TPT29545 to recover.Pulling RESET low resets the I 2C 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 5.5 V tolerant.TPT29545 is available in the TSSOP20 package,and is characterized from 40°C to+85°C.

Features

Bidirectional Translator of 1:4 I2C Switch

Four Active-Low Interrupt Inputs

Active-Low Interrupt Output and Active-Low Reset Input

Two Address Terminals,Allowing up to Four Devices on the I2C Bus

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

Allow Voltage-Level Translation among 2.5V,3.3V,and 5V 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

−±4000V Human-Body Model

−±1500V Charged-Device Model

Applications

Servers/Storages

Routers(Telecom Switching Equipment)

Factory Automation

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