德州仪器的I2C 多路复用器、开关 PCA9543ADr和PCA9543Apwr
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2-Channel I2C Bus Switch With Interrupt Logic and Reset

特性
1-of-2 Bidirectional Translating Switches
I2C Bus and S*us Compatible
Two Active-Low Interrupt Inputs
Active-Low Interrupt Output
Active-Low Reset Input
Two Address Pins Allowing up to Four Devices on the I2C Bus
Channel Selection Via I2C Bus, in Any Combination
Power Up With All Switch Channels Deselected
Low ron Switches
Allows Voltage-Level Translation Between 1.8-V, 2.5-V, 3.3-V, and 5-V Buses
No Glitch on Power Up
Supports Hot Insertion
Low Standby Current
Operating Power-Supply Voltage Range of 2.3 V to 5.5 V
5-V Tolerant Inputs
0 to 400-kHz Clock Frequency
Latch-Up Performance Exceeds 100 mA Per J*D78
*D Protection Exceeds J*D 22
2000-V Human-Body Model (A114-A)
200-V Machine Model (A115-A)
1000-V Charged-Device Model (C101)

D*CRIPTION/ORDERING INFORMATIONThe PCA9543A is a bidirectional translating switch controlled by the I2C bus. The SCL/SDA upstream pair fans out to two downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register. Two interrupt inputs (INT0-INT1), 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 (R*ET) input allows the PCA9543A to recover from a situation where one of the downstream I2C buses is stuck in a low state. Pulling R*ET low resets the I2C state machine and causes all the channels to be deselected, as does the internal power-on reset function.

The p* gates of the switches are constructed such that the VCC pin can be used to limit the maximum high voltage, which will be p*ed by the PCA9543A. 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 pullup resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5-V tolerant.

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