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PCA9513 Datasheet(PDF) 8 Page - Integrated Circuit Systems |
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PCA9513 Datasheet(HTML) 8 Page - Integrated Circuit Systems |
8 / 20 page Philips Semiconductors Product data sheet PCA9513; PCA9514 Hot swappable I2C and SMBus bus buffer 2004 Oct 05 8 Hot Swapping and Capacitance Buffering Application Figures 9 through 12 illustrate the usage of the PCA9513 and PCA9514 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 PCA9513 or PCA9514 drives the capacitance of everything on the card and the backplane must drive only the 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 Figure 9. Hot swapping multiple I/O cards into a backplane using the PCA9514 in a CompactPCI, VME, and AdvancedTCA system |
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