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PCA9512BDP Datasheet(PDF) 10 Page - NXP Semiconductors

Part # PCA9512BDP
Description  Level shifting hot swappable I2C-bus and SMBus bus buffer
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCA9512BDP Datasheet(HTML) 10 Page - NXP Semiconductors

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PCA9512A_PCA9512B
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 6 — 1 March 2013
10 of 27
NXP Semiconductors
PCA9512A; PCA9512B
Level shifting hot swappable I2C-bus and SMBus bus buffer
8.8 Hot swapping and capacitance buffering application
Figure 7 through Figure 9 illustrate the usage of the PCA9512A 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
PCA9512A 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.
Remark: Application assumes bus capacitance within ‘proper operation’ region of Figure 5 and Figure 6.
Fig 7.
Hot swapping multiple I/O cards into a backplane using the PCA9512A in a cPCI, VME, and AdvancedTCA
system
002aab791
R4
10 k
Ω
C1
0.01
μF
SDAOUT
SCLOUT
ACC
VCC2
GND
R5
10 k
Ω
R6
10 k
Ω
VCC
SDAIN
SCLIN
POWER SUPPLY
HOT SWAP
CARD1_SDA
CARD1_SCL
I/O PERIPHERAL CARD 1
BACKPLANE
CONNECTOR
R2
10 k
Ω
R1
10 k
Ω
VCC2
BACKPLANE
BD_SEL
SDA
SCL
VCC
R3
5.1
Ω
C2
0.01
μF
PCA9512A
R8
10 k
Ω
C3
0.01
μF
SDAOUT
SCLOUT
ACC
VCC2
GND
R9
10 k
Ω
R10
10 k
Ω
VCC
SDAIN
SCLIN
POWER SUPPLY
HOT SWAP
CARD2_SDA
CARD2_SCL
I/O PERIPHERAL CARD 2
R7
5.1
Ω
C4
0.01
μF
PCA9512A
R12
10 k
Ω
C5
0.01
μF
SDAOUT
SCLOUT
ACC
VCC2
GND
R13
10 k
Ω
R14
10 k
Ω
VCC
SDAIN
SCLIN
POWER SUPPLY
HOT SWAP
CARDN_SDA
CARDN_SCL
I/O PERIPHERAL CARD N
R11
5.1
Ω
C6
0.01
μF
PCA9512A


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