PCA9546A - 具有复位功能的 4 通道 I2C 和 SMBus 开关

PCA9546A是TI德州仪器公司的一款I2C多路复用器、开关产品，PCA9546A是具有复位功能的 4 通道 I2C 和 SMBus 开关，本站介绍了PCA9546A的封装应用图解、特点和优点、功能等，并给出了与PCA9546A相关的TI元器件型号供参考。

PCA9546A - 具有复位功能的 4 通道 I2C 和 SMBus 开关 - I2C多路复用器、开关 - I2C - 德州仪器

产品描述

The PCA9546A is a quad bidirectional translating switch controlled via the I2C bus. The SCL/SDA upstream pair fans out to four 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.

An active-low reset (RESET) input allows the PCA9546A to recover from a situation in which one of the downstream I2C buses is stuck in a low state. Pulling RESET low resets the I2C 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 pin can be used to limit the maximum high voltage, which will be passed by the PCA9546A. 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-4 Bidirectional Translating Switches
I2C Bus and SMBus Compatible
Active-Low Reset Input
Three Address Pins, Allowing up to Eight PCA9546A 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 JESD 78
ESD Protection Exceeds JESD 22
- 2000-V Human-Body Model (A114-A)
- 1000-V Charged-Device Model (C101)

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