Datasheet > UCA9543

UCA9543

更新时间： 2024-10-01 14:54:47

品牌	Logo	应用领域
友顺 - UTC		/
页数	文件大小	规格书
15页	340K
描述
2-channel i2c bus switch with interrupt logic and reset

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UCA9543 数据手册

UNISONIC TECHNOLOGIES CO., LTD

UCA9543

Advance

CMOS IC

2-CHANNEL I²C BUS SWITCH

WITH INTERRUPT LOGIC AND

RESET



DESCRIPTION

The UTC UCA9543 is a dual bidirectional translating switch

controlled by the I²C bus. The SCL/SDA upstream pair fans out to

two downstream pairs, or channels. Either individual SCn/SDn

channel or both channels can be selected, determined by the

contents of the programmable control register. Two interrupt inputs

(INT1-INT0 ), one for each of the downstream pairs, are provided.

One interrupt output (INT ) acts as an AND of the two interrupt

inputs.

An active-low reset (RESET ) input allows the UTC UCA9543

to recover from a situation where one of the downstream I²C buses

is stuck in a low state. Pulling RESET low resets the I²C state

machine and causes both of 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_CCpin can be used to limit the maximum high voltage, which will

be passed by the UTC UCA9543. This allows the use of different

bus voltages on each pair, so that 1.8V, 2.5V, or 3.3V parts can

communicate with 5V 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 5.5V tolerant.



FEATURES

* 1-of-2 Bidirectional Translating Switches

* I²C Bus and SMBus Compatible

* Two Active-Low Interrupt Inputs

* Active-Low Interrupt Output

* Active-Low Reset Input

* Two Address Pins Allowing up to Four UTC UCA9543

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 1.8V, 2.5V, 3.3V and

5V Buses

* No Glitch on Power-up

* Supports Hot Insertion

* Low Standby Current

* Operating Power-Supply Voltage Range of 2.3V to 5.5V

* 5.5-V Tolerant Inputs

* 0 to 400-kHz Clock Frequency

www.unisonic.com.tw

1 of 15

QW-R140-022.b

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