Philips Semiconductors
PCA9511A
Hot swappable I2C-bus and SMBus bus buffer
BACKPLANE
BACKPLANE
CONNECTOR
VCC
R1
10 kΩ
R2
10 kΩ
SDA
SCL
I/O PERIPHERAL CARD 1
C1
0.01 µF
R4
10 kΩ
R5
10 kΩ
R6
10 kΩ
C2
0.01 µF
ENABLE VCC SDAOUT
SDAIN
SCLOUT
SCLIN
READY
GND
CARD1_SDA
CARD1_SCL
I/O PERIPHERAL CARD 2
C3
0.01 µF
R8
10 kΩ
R9
10 kΩ
R10
10 kΩ
C4
0.01 µF
ENABLE VCC SDAOUT
SDAIN
SCLOUT
SCLIN
READY
GND
CARD2_SDA
CARD2_SCL
002aab585
Fig 8. Hot swapping multiple I/O cards into a backplane using the PCA9511A in a PCI system
VCC = 5 V
R1
R4
10 kΩ 10 kΩ
SDA1
SCL1
to other
System 1
devices
I2C-bus System 1
I2C-bus System 2
C1
0.01 µF
VCC
ENABLE SDAOUT
SDAIN
SCLOUT
SCLIN
READY
GND
R5
10 kΩ
R2
1 kΩ
R3
1 kΩ
R6
10 kΩ
long
distance
bus
C2
0.01 µF
VCC
SDAOUT ENABLE
SCLOUT
SDAIN
READY
SCLIN
GND
VCC
R7
R8
10 kΩ 10 kΩ
SDA1
SCL1
to other
System 2
devices
002aab586
Remark: See Application Note AN255, ‘I2C repeaters, hubs, and expanders’ for more information on other devices better
optimized for long distance transmission of the I2C-bus or SMBus.
Fig 9. Repeater/bus extender application using the PCA9511A
9397 750 13269
Product data sheet
Rev. 01 — 15 August 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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