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PCA9512AD Datasheet(PDF) 10 Page - NXP Semiconductors |
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PCA9512AD Datasheet(HTML) 10 Page - NXP Semiconductors |
10 / 27 page 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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