935289361118 datasheet, PDF - EEWORLD Datasheet

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935289361118: DescriptionMicroprocessor Circuit; CategoryThe embedded processor and controller Microcontrollers and processors; File Size378KB，45 Pages; ManufacturerNXP; Websitehttps://www.nxp.com

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Microprocessor Circuit

935289361118 Parametric

Parameter Name	Attribute value
Maker	NXP
package instruction	,
Reach Compliance Code	unknown
uPs/uCs/peripheral integrated circuit type	MICROPROCESSOR CIRCUIT

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PCA9541A

2-to-1 I

C-bus master selector with interrupt logic and reset

Rev. 5 — 24 April 2014

Product data sheet

1. General description

The PCA9541A is a 2-to-1 I

C-bus master selector designed for high reliability dual

master I

C-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 I

C-buses that connect to the same

downstream I

C-bus slave devices. I

C-bus commands are sent by either I

C-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 does not affect communication between the

on-line master and the slave devices on the downstream I

C-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 I

C-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. If the masking option is set,

those interrupts can be disabled and do not generate an interrupt.

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

STOP condition in order to set the downstream I

C-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 I

C-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 I

C-bus recovery/initialization must be performed. It can be disabled and

an interrupt is not generated.

The pass gates of the switches are constructed such that the V

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.

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