PCA9541AD View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
Manufacturer
PCA9541AD Datasheet PDF : 41 Pages
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NXP Semiconductors
PCA9541A
2-to-1 I2C-bus master selector with interrupt logic and reset
A
B
C
D
E
F
G
H
Z
Z
Z
Z
Z
Z
Z
Z
Fig 21. Gatekeeper multiplexer application
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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.
MASTER
SDA/SCL
SLAVE 0
SDA
PCA9541A/03
SCL
RESET
Fig 22. Bus initialization/recovery application
SLAVE 1
SLAVE 2
slave I2C-bus
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PCA9541A_3
Product data sheet
Rev. 03 — 16 July 2009
© NXP B.V. 2009. All rights reserved.
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