PCA9545A

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
27页	151K
描述
4-channel I2C switch with interrupt logic and reset

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PCA9545A 数据手册

PCA9545A

4-channel I²C switch with interrupt logic and reset

Rev. 03 — 3 March 2005

Product data sheet

1. General description

The PCA9545A 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. Four interrupt inputs, INT0 to INT3, one for

each of the downstream pairs, are provided. One interrupt output, INT, acts as an AND of

the four interrupt inputs.

An active LOW reset input allows the PCA9545A 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 PCA9545A. 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

■ 4 active LOW interrupt inputs

■ Active LOW interrupt output

■ Active LOW reset input

■ 2 address pins allowing up to 4 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 protection exceeds 100 mA per JESD78

12 3 4 5 6 7...27

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与PCA9545A相关器件

型号	品牌	获取价格	描述	数据表
PCA9545A_16	TI	获取价格	Interrupt Logic and Reset Functions
PCA9545ABS	NXP	获取价格	4-channel I2C switch with interrupt logic and reset
PCA9545AD	NXP	获取价格	4-channel I2C switch with interrupt logic and reset
PCA9545AD,118	NXP	获取价格	PCA9545A/45B/45C - 4-channel I²C-bus switch w
PCA9545ADGVR	TI	获取价格	4-CHANNEL I2C AND SMBus SWITCH WITH INTERRUPT LOGIC AND RESET FUNCTIONS
PCA9545ADGVRG4	TI	获取价格	4-Channel I<sup>2</sup>C And SMBus Multiplexer With Interrupt Logic And Reset
PCA9545ADGVT	TI	获取价格	4-CHANNEL I2C AND SMBus SWITCH WITH INTERRUPT LOGIC AND RESET FUNCTIONS
PCA9545ADW	TI	获取价格	4-CHANNEL I2C AND SMBus SWITCH WITH INTERRUPT LOGIC AND RESET FUNCTIONS
PCA9545ADWR	TI	获取价格	4-CHANNEL I2C AND SMBus SWITCH WITH INTERRUPT LOGIC AND RESET FUNCTIONS
PCA9545ADWRG4	TI	获取价格	9545 SERIES, 4 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDSO20, GREEN, PLASTIC, SOIC-20

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