TCA9543A Overview
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. Pulling RESET low resets the I2C state machine and causes both of the channels to be deselected, as does the internal power-on reset function. (e.g. Processor) SDA SCL INT VCC RESET Channel 0 SD0 SC0 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in...
TCA9543A Key Features
- 1 1-of-2 Bidirectional Translating Switches
- I2C Bus and SMBus patible
- Two active-low interrupt inputs
- Active-low interrupt output
- Active-low reset input
- Two address pins allowing up to four TCA9543A
- Channel selection via I2C bus, in any bination
- Power-up with all switch channels deselected
- Low RON switches
- Allows voltage-level translation between