Datasheet
PCA9513A_PCA9514A_4 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 04 — 18 August 2009 10 of 26
NXP Semiconductors
PCA9513A; PCA9514A
Hot swappable I
2
C-bus and SMBus bus buffer
8.9 Hot swapping and capacitance buffering application
Figure 8 through Figure 11 illustrate the usage of the PCA9513A and PCA9514A 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 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 PCA9513A and PCA9514A drive 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.
Remark: The PCA9514A can be used in any combination depending on the number of rise time accelerators that are needed
by the system. Normally only one PCA9514A would be required per bus.
Fig 8. Hot swapping multiple I/O cards into a backplane using the PCA9514A in a cPCI, VME, and AdvancedTCA
system
002aab584
R4
10 kΩ
C1
0.01 µF
SDAOUT
SCLOUT
READY
V
CC
GND
R5
10 kΩ
R6
10 kΩ
R3
10 kΩ
ENABLE
SDAIN
SCLIN
POWER SUPPLY
HOT SWAP
CARD1_SDA
CARD1_SCL
STAGGERED CONNECTOR
I/O PERIPHERAL CARD 1
BACKPLANE
CONNECTOR
R8
10 kΩ
C3
0.01 µF
SDAOUT
SCLOUT
READY
V
CC
GND
R9
10 kΩ
R10
10 kΩ
R7
10 kΩ
ENABLE
SDAIN
SCLIN
POWER SUPPLY
HOT SWAP
CARD2_SDA
CARD2_SCL
STAGGERED CONNECTOR
I/O PERIPHERAL CARD 2
R12
10 kΩ
C5
0.01 µF
SDAOUT
SCLOUT
READY
V
CC
GND
R13
10 kΩ
R14
10 kΩ
R11
10 kΩ
ENABLE
SDAIN
SCLIN
POWER SUPPLY
HOT SWAP
CARDN_SDA
CARDN_SCL
STAGGERED CONNECTOR
I/O PERIPHERAL CARD N
R2
10 kΩ
R1
10 kΩ
V
CC
BACKPLANE
BD_SEL
SDA
SCL