Datasheet > PCA9544A_09

PCA9544A_09

更新时间： 2024-09-17 11:51:35

品牌	Logo	应用领域
恩智浦 - NXP		复用器
页数	文件大小	规格书
26页	139K
描述
4-channel I2C-bus multiplexer with interrupt logic

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PCA9544A_09 数据手册

PCA9544A

4-channel I²C-bus multiplexer with interrupt logic

Rev. 04 — 15 June 2009

Product data sheet

1. General description

The PCA9544A is a 1-of-4 bidirectional translating multiplexer, controlled via the I²C-bus.

The SCL/SDA upstream pair fans out to four SCx/SDx downstream pairs, or channels.

Only one SCx/SDx channel is selected at a time, determined by the contents of the

programmable control register. Four interrupt inputs, INT0 to INT3, one for each of the

SCx/SDx downstream pairs, are provided. One interrupt output, INT, which acts as an

AND of the four interrupt inputs, is provided.

A power-on reset function puts the registers in their default state and initializes the I²C-bus

state machine with no channels selected.

The pass gates of the multiplexer are constructed such that the V_DDpin can be used to

limit the maximum high voltage which will be passed by the PCA9544A. 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.

2. Features

I 1-of-4 bidirectional translating multiplexer

I I²C-bus interface logic; compatible with SMBus

I 4 active LOW interrupt inputs

I Active LOW interrupt output

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

I Channel selection via I²C-bus

I Power-up with all multiplexer 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

I 5 V tolerant Inputs

I 0 Hz to 400 kHz clock frequency

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

JESD22-A115 and 1000 V CDM per JESD22-C101

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

I Three packages offered: SO20, TSSOP20 and HVQFN20

12 3 4 5 6 7...26

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