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PCA9512AD Datasheet(PDF) 5 Page - NXP Semiconductors |
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PCA9512AD Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 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 5 of 27 NXP Semiconductors PCA9512A; PCA9512B Level shifting hot swappable I2C-bus and SMBus bus buffer 7. Pinning information 7.1 Pinning 7.2 Pin description 8. Functional description Refer to Figure 1 “Block diagram of PCA9512A/B”. Both the PCA9512A and PCA9512B use identical silicon (PCN201012007F dated 13 Dec 2010), so the PCA9512B will be discontinued in the near future and is not recommended for new designs. Customers should continue using the PCA9512A or move to the PCA9512A during the next refresh if they are currently using the PCA9512B. Description of the PCA9512A operation applies equally to the PCA9512B for the remainder of this data sheet. 8.1 Start-up When the PCA9512A is powered up, either VCC or VCC2 may rise first, within a short time of each other and either may be more positive or they may be equal, however the PCA9512A will not leave the undervoltage lockout or initialization state until both VCC and VCC2 have gone above 2.5 V. If either VCC or VCC2 drops below 2.0 V it will return to the undervoltage lockout state. Fig 2. Pin configuration for SO8 Fig 3. Pin configuration for TSSOP8 VCC2 VCC SCLOUT SDAOUT SCLIN SDAIN GND ACC 002aab789 1 2 3 4 6 5 8 7 PCA9512AD PCA9512BD PCA9512ADP PCA9512BDP VCC2 VCC SCLOUT SDAOUT SCLIN SDAIN GND ACC 002aab790 1 2 3 4 6 5 8 7 Table 4. Pin description Symbol Pin Description VCC2 1 Supply voltage for devices on the card I2C-bus. Connect pull-up resistors from SDAOUT and SCLOUT to this pin. SCLOUT 2 serial clock output to and from the SCL bus on the card SCLIN 3 serial clock input to and from the SCL bus on the backplane GND 4 ground supply; connect this pin to a ground plane for best results. ACC 5 CMOS threshold digital input pin that enables and disables the rise time accelerators on all four SDAn and SCLn pins. ACC enables all accelerators when set to VCC2, and turns them off when set to GND. SDAIN 6 serial data input to and from the SDA bus on the backplane SDAOUT 7 serial data output to and from the SDA bus on the card VCC 8 supply voltage; from the backplane, connect pull-up resistors from SDAIN and SCLIN to this pin. |
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