PCA9546A

更新时间： 2024-11-08 22:50:43

品牌	Logo	应用领域
恩智浦 - NXP		开关
页数	文件大小	规格书
25页	141K
描述
4-channel I2C switch with reset

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PCA9546A 数据手册

PCA9546A

4-channel I²C switch with reset

Rev. 03 — 6 April 2005

Product data sheet

1. General description

The PCA9546A is a quad bi-directional translating switch controlled via the I²C-bus. The

SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual

SCx/SDx channel or combination of channels can be selected, determined by the

contents of the programmable control register.

An active LOW reset input allows the PCA9546A to recover from a situation where one of

the downstream I²C-buses is stuck in a LOW state. Pulling the RESET pin LOW resets the

I²C-bus state machine and causes all the channels to be deselected as does the internal

Power-On Reset (POR) function.

The pass gates of the switches are constructed such that the V_DDpin 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 or 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 V tolerant.

2. Features

■ 1-of-4 bi-directional translating switches

■ I²C-bus interface logic; compatible with SMBus standards

■ Active LOW reset input

■ 3 address pins allowing up to 8 devices on the I²C-bus

■ Channel selection via I²C-bus, in any combination

■ Power-up with all switch channels deselected

■ Low R_onswitches

■ 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 stand-by current

■ Operating power supply voltage range of 2.3 V to 5.5 V

■ 5 V tolerant Inputs

■ 0 kHz to 400 kHz clock frequency

■ ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per

JESD22-A115, and 1000 V CDM per JESD22-C101

■ Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

■ Three packages offered: SO16, TSSOP16, and HVQFN16

12 3 4 5 6 7...25

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