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PCA9512 Datasheet(PDF) 7 Page - NXP Semiconductors |
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PCA9512 Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 16 page Philips Semiconductors Product data sheet PCA9512 Level shifting hot swappable I2C and SMBus buffer 2004 Oct 05 7 Hot Swapping and Capacitance Buffering Application Figures 7 through 9 illustrate the usage of the PCA9512 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 PCA9512 on the edge of each card, however, isolates the card capacitance from the backplane. For a given I/O card, the PCA9512 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 R3 5.1 Ω C2 0.01 µF VCC VCC2 SDAIN SCLIN SDAOUT SCLOUT ACC GND CARD1_SDA CARD1_SCL PCA9512 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 R7 5.1 Ω C4 0.01 µF VCC VCC2 SDAIN SCLIN SDAOUT SCLOUT ACC GND CARD2_SDA CARD2_SCL PCA9512 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 C6 0.01 µF VCC VCC2 SDAIN SCLIN SDAOUT SCLOUT ACC GND CARDN_SDA CARDN_SCL PCA9512 R1 10 k Ω R2 10 k Ω VCC2 VCC SDA SCL BD_SEL BACKPLANE BACKPLANE CONNECTOR SW02117 R11 5.1 Ω NOTE: Application assumes bus capacitance within “proper operation” region of Figures 5 and 6. Figure 7. Hot swapping multiple I/O cards into a backplane using the PCA9512 in a CompactPCI, VME, and AdvancedTCA system |
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