PCA9541ADSLASH03 datasheet(27/41 Pages) NXP

Nome de Peças	PCA9541AD/03

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

PDF	41 Pages

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Fabricante Electrônico	NXP [NXP Semiconductors]

Página de início	http://www.nxp.com

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27 / 41 page

PCA9541A_3

Product data sheet

Rev. 03 — 16 July 2009

27 of 41

NXP Semiconductors

PCA9541A

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

10.5 Bus initialization/recovery to initialize slaves without hardware reset

If the I2C-bus is hung, I2C-bus devices without a hardware reset pin (for example, Slave 1

and Slave 2 in Figure 22) can be isolated from the master by the PCA9541A/03. The

PCA9541A/03 disconnects the bus when it is reset via the hardware reset line, restoring

the master's control of the rest of the bus (for example, Slave 0). The bus master can then

command the PCA9541A/03 to send 9 clock pulses/STOP condition to reset the

downstream I2C-bus devices before they are reconnected to the master or leave the

downstream devices isolated.

Fig 21. Gatekeeper multiplexer application

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Fig 22. Bus initialization/recovery application

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PCA9541A/03

SLAVE 1

SDA

SCL

SLAVE 2

slave I2C-bus

MASTER

SLAVE 0

RESET

SDA/SCL

PCA9541AD/03 Folha de dados(PDF) 27 Page - NXP Semiconductors