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PCA9510D Datasheet(PDF) 8 Page - NXP Semiconductors |
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PCA9510D Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 19 page Philips Semiconductors Product data sheet PCA9510; PCA9511 Hot swappable I2C and SMBus bus buffer 2004 Oct 05 8 Hot Swapping and Capacitance Buffering Application Figures 9 through 11 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. C1 0.01 µF R4 10 k Ω R5 10 k Ω POWER SUPPLY HOT SWAP I/O PERIPHERAL CARD 1 R6 10 k Ω ENABLE VCC SDAIN SCLIN SDAOUT SCLOUT READY GND CARD1_SDA CARD1_SCL R1 10 k Ω R2 10 k Ω VCC SDA SCL BD_SEL BACKPLANE BACKPLANE CONNECTOR C3 0.01 µF R8 10 k Ω R9 10 k Ω POWER SUPPLY HOT SWAP I/O PERIPHERAL CARD 2 R10 10 k Ω ENABLE VCC SDAIN SCLIN SDAOUT SCLOUT GND CARD2_SDA CARD2_SCL C5 0.01 µF R12 10 k Ω R13 10 k Ω POWER SUPPLY HOT SWAP I/O PERIPHERAL CARD N R14 10 k Ω ENABLE VCC SDAIN SCLIN SDAOUT SCLOUT GND CARDN_SDA CARDN_SCL SW02126 R11 10 k Ω R7 10 k Ω R3 10 k Ω READY READY 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 9. Hot swapping multiple I/O cards into a backplane using the PCA9510 and PCA9511 in a CompactPCI, VME, and AdvancedTCA system |
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