TCA9543A Series
2-channel 1.65- to 5.5-V I2C/SMBus switch with interrupt, reset & voltage translation
Manufacturer: Texas Instruments
Catalog
2-channel 1.65- to 5.5-V I2C/SMBus switch with interrupt, reset & voltage translation
Key Features
• 1-of-2 Bidirectional Translating SwitchesI2C Bus and SMBus CompatibleTwo active-low interrupt inputsActive-low interrupt outputActive-low reset inputTwo address pins allowing up to four TCA9543A devices on the I2C busChannel selection via I2C bus, in any combinationPower-up with all switch channels deselectedLow RONswitchesAllows voltage-level translation between1.8-V, 2.5-V, 3.3-V, and 5-V busesNo glitch on power-upSupports hot insertionLow standby currentOperating power-supply voltage range of 1.65-V to 5.5-V5.5-V Tolerant inputs0 to 400-kHz Clock frequencyLatch-up Performance exceeds 100-mA Per JESD78ESD Protection exceeds JESD 224000-V Human-body model (A114-A)1500-V Charged-device model (C101)1-of-2 Bidirectional Translating SwitchesI2C Bus and SMBus CompatibleTwo active-low interrupt inputsActive-low interrupt outputActive-low reset inputTwo address pins allowing up to four TCA9543A devices on the I2C busChannel selection via I2C bus, in any combinationPower-up with all switch channels deselectedLow RONswitchesAllows voltage-level translation between1.8-V, 2.5-V, 3.3-V, and 5-V busesNo glitch on power-upSupports hot insertionLow standby currentOperating power-supply voltage range of 1.65-V to 5.5-V5.5-V Tolerant inputs0 to 400-kHz Clock frequencyLatch-up Performance exceeds 100-mA Per JESD78ESD Protection exceeds JESD 224000-V Human-body model (A114-A)1500-V Charged-device model (C101)
Description
AI
The TCA9543A is a dual bidirectional translating switch controlled by the I2C bus. The SCL/SDA upstream pair fans out to two downstream pairs, or channels. Either individual SCn/SDn channel or both channels can be selected, determined by the contents of the programmable control register. Two interrupt inputs (INT1–INT0), one for each of the downstream pairs, are provided. One interrupt output (INT) acts as an AND of the two interrupt inputs.
An active-low reset (RESET) input allows the TCA9543A to recover from a situation where one of the downstream I2C buses is stuck in a low state. PullingRESETlow resets the I2C state machine and causes both of 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 TCA9543A. This allows the use of different bus voltages on each pair, so that 1.8-V, 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 TCA9543A is a dual bidirectional translating switch controlled by the I2C bus. The SCL/SDA upstream pair fans out to two downstream pairs, or channels. Either individual SCn/SDn channel or both channels can be selected, determined by the contents of the programmable control register. Two interrupt inputs (INT1–INT0), one for each of the downstream pairs, are provided. One interrupt output (INT) acts as an AND of the two interrupt inputs.
An active-low reset (RESET) input allows the TCA9543A to recover from a situation where one of the downstream I2C buses is stuck in a low state. PullingRESETlow resets the I2C state machine and causes both of 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 TCA9543A. This allows the use of different bus voltages on each pair, so that 1.8-V, 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.
