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PCA9543AD,118

更新时间： 2025-08-21 18:16:15

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
23页	131K
描述
2-channel I2C-bus switch with interrupt logic and reset

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PCA9543AD,118 数据手册

PCA9543A/43B/43C

2-channel I²C-bus switch with interrupt logic and reset

Rev. 05 — 17 November 2008

Product data sheet

1. General description

The PCA9543A/43B/43C 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 SCx/SDx channels or combination of channels can be selected, determined by

the contents of the programmable control register. Two interrupt inputs, INT0 and INT1,

one for each of the downstream pairs, are provided. One interrupt output, INT, which acts

as an AND of the two interrupt inputs, is provided.

An active LOW reset input allows the PCA9543X 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 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 PCA9543X. This allows the use of

different bus voltages on each SCx/SDx 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 V tolerant.

The PCA9543A, PCA9543B and PCA9543C are identical except for the ﬁxed portion of

the slave address.

2. Features

I 1-of-2 bidirectional translating switches

I I²C-bus interface logic; compatible with SMBus standards

I 2 active LOW interrupt inputs

I Active LOW interrupt output

I Active LOW reset input

I 2 address pins allowing up to 4 devices on the I²C-bus

I Alternate address versions A, B and C allow up to a total of 12 devices on the bus for

larger systems or to resolve address conﬂicts

I Channel selection via I²C-bus, in any combination

I Power-up with all switch channels deselected

I Low R_onswitches

I Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V and 5 V buses

I No glitch on power-up

I Supports hot insertion

I Low standby current

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

12 3 4 5 6 7...23

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PCA9543AD,118 替代型号

型号	品牌	替代类型	描述	数据表
PCA9543APW,112	NXP	完全替代	PCA9543A/43B - 2-channel I²C-bus switch with

与PCA9543AD,118相关器件

型号	品牌	获取价格	描述	数据表
PCA9543AD-T	NXP	获取价格	2-channel I2C-bus switch with interrupt logic and reset - # of Addresses: 4 ; I2C-bus: 400
PCA9543ADG4	TI	获取价格	TWO-CHANNEL I2C-BUS SWITCH WITH INTERRUPT LOGIC AND RESET
PCA9543ADR	TI	获取价格	TWO-CHANNEL I2C-BUS SWITCH WITH INTERRUPT LOGIC AND RESET
PCA9543ADRG4	TI	获取价格	TWO-CHANNEL I2C-BUS SWITCH WITH INTERRUPT LOGIC AND RESET
PCA9543APW	TI	获取价格	TWO-CHANNEL I2C-BUS SWITCH WITH INTERRUPT LOGIC AND RESET
PCA9543APW	NXP	获取价格	2-channel I2C-bus switch with interrupt logic and reset
PCA9543APW,112	NXP	获取价格	PCA9543A/43B - 2-channel I²C-bus switch with
PCA9543APW,118	NXP	获取价格	PCA9543A/43B - 2-channel I²C-bus switch with
PCA9543APWG4	TI	获取价格	TWO-CHANNEL I2C-BUS SWITCH WITH INTERRUPT LOGIC AND RESET
PCA9543APWR	TI	获取价格	TWO-CHANNEL I2C-BUS SWITCH WITH INTERRUPT LOGIC AND RESET

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