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PCA9511A Datasheet PDF : 24 Pages
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NXP Semiconductors
PCA9511A
Hot swappable I2C-bus and SMBus bus buffer
8.9 Hot swapping and capacitance buffering application
Figure 7 through Figure 10 illustrate the usage of the PCA9511A in applications that take
advantage of both its hot swapping and capacitance buffering features. In all of these
applications, note that if the I/O cards were plugged directly into the backplane, all of the
backplane and card capacitances would add directly together, making rise time and
fall time requirements difficult to meet. Placing a bus buffer on the edge of each card,
however, isolates the card capacitance from the backplane. For a given I/O card, the
PCA9511A drives the capacitance of everything on the card and the backplane must drive
only the capacitance of the bus buffer, which is less than 10 pF, the connector, trace, and
all additional cards on the backplane.
See Application Note AN10160, ‘Hot Swap Bus Buffer’ for more information on
applications and technical assistance.
BACKPLANE
BACKPLANE
CONNECTOR
VCC
R1
10 kΩ
R2
10 kΩ
BD_SEL
SDA
SCL
POWER SUPPLY
HOT SWAP
I/O PERIPHERAL CARD 1
R3
10 kΩ
C1
0.01 µF
R4
10 kΩ
R5
10 kΩ
R6
10 kΩ
ENABLE VCC SDAOUT
SDAIN
SCLOUT
SCLIN
READY
GND
CARD1_SDA
CARD1_SCL
POWER SUPPLY
HOT SWAP
I/O PERIPHERAL CARD 2
R7
10 kΩ
C3
0.01 µF
R8
10 kΩ
R9
10 kΩ
R10
10 kΩ
ENABLE VCC SDAOUT
SDAIN
SCLOUT
SCLIN
READY
GND
CARD2_SDA
CARD2_SCL
POWER SUPPLY
HOT SWAP
I/O PERIPHERAL CARD N
R11
10 kΩ
C5
0.01 µF
R12
10 kΩ
R13
10 kΩ
R14
10 kΩ
ENABLE VCC SDAOUT
SDAIN
SCLOUT
SCLIN GND READY
CARDN_SDA
CARDN_SCL
002aab584
Fig 7.
Remark: The PCA9511A can be used in any combination depending on the number of rise time accelerators that are needed
by the system. Normally only one PCA9511A would be required per bus.
Hot swapping multiple I/O cards into a backplane using the PCA9511A in a cPCI, VME, and AdvancedTCA
system
PCA9511A_4
Product data sheet
Rev. 04 — 19 August 2009
© NXP B.V. 2009. All rights reserved.
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