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PCA9541 Datasheet(PDF) 28 Page - NXP Semiconductors

Part # PCA9541
Description  2-to-1 I2C-bus master selector with interrupt logic and reset
PDF  43 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCA9541 Datasheet(HTML) 28 Page - NXP Semiconductors

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PCA9541_6
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 06 — 11 September 2008
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
Z
A
Z
B
Z
C
Z
D
Z
E
Z
F
Z
G
Z
H
Fig 22. Bus initialization/recovery application
002aab616
PCA9541/03
SLAVE 1
SDA
SCL
SLAVE 2
slave I2C-bus
MASTER
SLAVE 0
RESET
SDA/SCL



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