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PCA9541AD/01 Datasheet(PDF) 27 Page - NXP Semiconductors

Part # PCA9541AD/01
Description  2-to-1 I2C-bus master selector with interrupt logic and reset
PDF  41 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCA9541AD/01 Datasheet(HTML) 27 Page - NXP Semiconductors

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PCA9541A_3
© NXP B.V. 2009. All rights reserved.
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
002aae665
Z
A
Z
B
Z
C
Z
D
Z
E
Z
F
Z
G
Z
H
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



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