PCA9698 datasheet(16/47 Pages) PHILIPS

Part #	PCA9698

Description	40-bit Fm I2C-bus advanced I/O port with RESET, OE and INT

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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16 / 47 page

PCA9698_2

Product data sheet

Rev. 02 — 19 July 2006

16 of 47

Philips Semiconductors

PCA9698

40-bit Fm+ I2C-bus advanced I/O port with RESET, OE and INT

7.5 Device ID - PCA9698 ID ﬁeld

The Device ID ﬁeld is a 3 byte read-only (24 bits) word giving the following information:

• 12 bits with the manufacturer name, unique per manufacturer (e.g., Philips)

• 9 bits with the part identiﬁcation, assigned by manufacturer (e.g., PCA9698)

• 3 bits with the die revision, assigned by manufacturer (e.g., RevX)

The Device ID is read-only, hard-wired in the device and can be accessed as follows:

1. START command

2. The master sends the Reserved Device ID I2C-bus address followed by the R/W bit

set to ‘0’ (write): ‘1111 1000’.

3. The master sends the I2C-bus slave address of the slave device it needs to identify.

The LSB is a ‘Don’t care’ value. Only one device must acknowledge this byte (the one

that has the I2C-bus slave address).

4. The master sends a Re-START command.

Remark: A STOP command followed by a START command will reset the slave state

machine and the Device ID Read cannot be performed. Also, a STOP command or a

Re-START command followed by an access to another slave device will reset the

slave state machine and the Device ID Read cannot be performed.

5. The master sends the Reserved Device ID I2C-bus address followed by the R/W bit

set to ‘1’ (read): ‘1111 1001’.

6. The Device ID Read can be done, starting with the 12 manufacturer bits (ﬁrst byte +

4 MSBs of the second byte), followed by the 9 part identiﬁcation bits (4 LSBs of the

second byte + 5 MSBs of the third byte), and then the 3 die revision bits (3 LSBs of

the third byte).

7. The master ends the reading sequence by NACKing the last byte, thus resetting the

slave device state machine and allowing the master to send the STOP command.

Remark: The reading of the Device ID can be stopped anytime by sending a NACK

command.

If the master continues to ACK the bytes after the third byte, the PCA9698 rolls back

to the ﬁrst byte and keeps sending the Device ID sequence until a NACK has been

detected.

For the PCA9698, the Device ID is as shown in Figure 10.

Fig 10. PCA9698 ID ﬁeld

0

002aab942

0

revision

0

part identification

manufacturer

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