PCA9543A - PCA9543A, PCA9543B, PCA9543C

PCA9543A是TI德州仪器公司的一款I2C多路复用器、开关产品，PCA9543A是PCA9543A, PCA9543B, PCA9543C，本站介绍了PCA9543A的封装应用图解、特点和优点、功能等，并给出了与PCA9543A相关的TI元器件型号供参考。

PCA9543A - PCA9543A, PCA9543B, PCA9543C - I2C多路复用器、开关 - I2C - 德州仪器

产品描述

The PCA9543A 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 PCA9543A 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.

The pass gates of the switches are constructed such that the VCC pin can be used to limit the maximum high voltage, which will be passed 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 pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5.5-V tolerant.

产品特性

1-of-2 Bidirectional Translating Switches
I2C Bus and SMBus Compatible
Two Active-Low Interrupt Inputs
Active-Low Interrupt Output
Active-Low Reset Input
Two Address Pins Allowing up to Four PCA9543A 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
5.5-V Tolerant Inputs
0 to 400-kHz Clock Frequency
Latch-Up Performance Exceeds 100-mA Per JESD78
ESD Protection Exceeds JESD 22
- 2000-V Human-Body Model (A114-A)
- 1000-V Charged-Device Model (C101)

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