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PCA9511D

Hot swappable I2C-bus and SMBus bus buffer

NXP Semiconductors. 

Philips Semiconductors

Hot swappable I2C-bus and SMBus bus buffer

Product data sheet

PCA9511

Hot Swapping and Capacitance Buffering

Application

Figures 7 through 9 illustrate the usage of the PCA9510 and

PCA9511 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 PCA9510 and PCA9511 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.

BACKPLANE

VCC

R1

10 kΩ

R2

10 kΩ

BD_SEL

SDA

SCL

BACKPLANE

CONNECTOR

POWER SUPPLY

HOT SWAP

I/O PERIPHERAL CARD 1

R3

10 kΩ

C1

0.01 µF

R4

R5

R6

10 kΩ 10 kΩ 10 kΩ

ENABLE

SDAIN

SCLIN

VCC

GND

SDAOUT

SCLOUT

READY

CARD1_SDA

CARD1_SCL

POWER SUPPLY

HOT SWAP

I/O PERIPHERAL CARD 2

R7

10 kΩ

C3

0.01 µF

R8

R9

R10

10 kΩ 10 kΩ 10 kΩ

ENABLE

SDAIN

SCLIN

VCC

GND

SDAOUT

SCLOUT

READY

CARD2_SDA

CARD2_SCL

POWER SUPPLY

HOT SWAP

I/O PERIPHERAL CARD N

R11

10 kΩ

C5

0.01 µF

R12 R13

R14

10 kΩ 10 kΩ 10 kΩ

ENABLE

SDAIN

SCLIN

VCC

GND

SDAOUT

SCLOUT

READY

CARDN_SDA

CARDN_SCL

SW02126

NOTE: The PCA9510 and PCA9511 can be used in any combination depending on the number of rise time accelerators that are needed by the

system. Normally only one PCA9511 would be required per bus.

Figure 7. Hot swapping multiple I/O cards into a backplane using the PCA9510 and PCA9511 in a CompactPCI, VME, and

AdvancedTCA system

2006 Aug 23

7

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