PCA9512BD Ver la hoja de datos (PDF) - NXP Semiconductors.

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PCA9512BD

Level shifting hot swappable I2C-bus and SMBus bus buffer

NXP Semiconductors. 

NXP Semiconductors

7. Pinning information

7.1 Pinning

PCA9512A; PCA9512B

Level shifting hot swappable I2C-bus and SMBus bus buffer

VCC2 1

8 VCC

SCLOUT 2 PCA9512AD 7 SDAOUT

SCLIN 3 PCA9512BD 6 SDAIN

GND 4

5 ACC

002aab789

Fig 2. Pin configuration for SO8

VCC2 1

SCLOUT 2

SCLIN 3

GND 4

PCA9512ADP

PCA9512BDP

8 VCC

7 SDAOUT

6 SDAIN

5 ACC

002aab790

Fig 3. Pin configuration for TSSOP8

7.2 Pin description

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

SDAIN

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.

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.

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.

PCA9512A_PCA9512B

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 6 — 1 March 2013

© NXP B.V. 2013. All rights reserved.

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