PCA9541ADSLASH03 datasheet(1/41 Pages) NXP

номер детали	PCA9541AD/03

подробное описание детали	2-to-1 I2C-bus master selector with interrupt logic and reset

PDF	41 Pages

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производитель	NXP [NXP Semiconductors]

домашняя страница	http://www.nxp.com

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1.

General description

The PCA9541A is a 2-to-1 I2C-bus master selector designed for high reliability dual

master I2C-bus applications where system operation is required, even when one master

fails or the controller card is removed for maintenance. The two masters (for example,

primary and back-up) are located on separate I2C-buses that connect to the same

downstream I2C-bus slave devices. I2C-bus commands are sent by either I2C-bus master

and are used to select one master at a time. Either master at any time can gain control of

the slave devices if the other master is disabled or removed from the system. The failed

master is isolated from the system and will not affect communication between the on-line

master and the slave devices on the downstream I2C-bus.

Two versions are offered for different architectures. PCA9541A/01 with channel 0 selected

at start-up, and PCA9541A/03 with no channel selected after start-up.

The interrupt outputs are used to provide an indication of which master has control of the

bus. One interrupt input (INT_IN) collects downstream information and propagates it to

the 2 upstream I2C-buses (INT0 and INT1) if enabled. INT0 and INT1 are also used to let

the previous bus master know that it is not in control of the bus anymore and to indicate

the completion of the bus recovery/initialization sequence. Those interrupts can be

disabled and will not generate an interrupt if the masking option is set.

A bus recovery/initialization if enabled sends nine clock pulses, a not acknowledge, and a

STOP condition in order to set the downstream I2C-bus devices to an initialized state

before actually switching the channel to the selected master.

An interrupt is sent to the upstream channel when the recovery/initialization procedure is

completed.

An internal bus sensor senses the downstream I2C-bus trafﬁc and generates an interrupt

if a channel switch occurs during a non-idle bus condition. This function is enabled when

the PCA9541A recovery/initialization is not used. The interrupt signal informs the master

that an external I2C-bus recovery/initialization needs to be performed. It can be disabled

and an interrupt will not be generated.

The pass gates of the switches are constructed such that the VDD pin can be used to limit

the maximum high voltage, which will be passed by the PCA9541A. This allows the use of

different bus voltages on each pair, so that 1.8 V, 2.5 V, or 3.3 V devices can communicate

with 5 V devices without any additional protection.

The PCA9541A does not isolate the capacitive loading on either side of the device, so the

designer must take into account all trace and device capacitances on both sides of the

device, and pull-up resistors must be used on all channels.

External pull-up resistors pull the bus to the desired voltage level for each channel. All I/O

pins are 6.0 V tolerant.

PCA9541A

2-to-1 I2C-bus master selector with interrupt logic and reset

Rev. 03 — 16 July 2009

Product data sheet

Аналогичный номер детали - PCA9541AD/03

производитель	номер детали	датащи	подробное описание детали
NXP Semiconductors	PCA9541AD/03	383Kb / 45P	2-to-1 I2C-bus master selector with interrupt logic and reset Rev. 5 ??24 April 2014

More results

Аналогичное описание - PCA9541AD/03

производитель	номер детали	датащи	подробное описание детали
NXP Semiconductors	PCA9543	120Kb / 15P	2-channel I2C switch with interrupt logic and reset 2004 Oct 01
	PCA9541	279Kb / 30P	2-to-1 I2C master selector with interrupt logic and reset 2004 Oct 01
	PCA9541	216Kb / 43P	2-to-1 I2C-bus master selector with interrupt logic and reset Rev. 05-1 October 2007
Texas Instruments	PCA9543A	499Kb / 20P	TWO-CHANNEL I2C-BUS SWITCH WITH INTERRUPT LOGIC AND RESET
NXP Semiconductors	PCA9541	215Kb / 43P	2-to-1 I2C-bus master selector with interrupt logic and reset Rev. 06-11 September 2008
	PCA9543A	131Kb / 23P	2-channel I2C-bus switch with interrupt logic and reset Rev. 05-17 November 2008
	PCA9541	225Kb / 41P	2-to-1 I2C-bus master selector with interrupt logic and reset Rev. 07-2 July 2009
	PCA9543A	139Kb / 23P	2-channel I2C-bus switch with interrupt logic and reset Rev. 06-15 June 2009
	PCA9541A	383Kb / 45P	2-to-1 I2C-bus master selector with interrupt logic and reset Rev. 5 ??24 April 2014
	PCA9545A	455Kb / 33P	4-channel I2C-bus switch with interrupt logic and reset Rev. 10 - 27 September 2022

More results

PCA9541AD/03 датащи(PDF) 1 Page - NXP Semiconductors

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Аналогичный номер детали - PCA9541AD/03

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