PCA9541BSSLASH03 datasheet(28/43 Pages) NXP

Il numero della parte	PCA9541BS/03

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

PDF	43 Pages

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Produttore elettronici	NXP [NXP Semiconductors]

Homepage	http://www.nxp.com

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28 / 43 page

PCA9541_5

Product data sheet

Rev. 05 — 1 October 2007

28 of 43

NXP Semiconductors

PCA9541

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 PCA9541/03. The

PCA9541/03 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 PCA9541/03 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

002aab615

Fig 22. Bus initialization/recovery application

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PCA9541/03

SLAVE 1

SDA

SCL

SLAVE 2

slave I2C-bus

MASTER

SLAVE 0

RESET

SDA/SCL

PCA9541BS/03 Scheda tecnica(PDF) 28 Page - NXP Semiconductors