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PCA9846PWJ Datasheet(PDF) 8 Page - NXP Semiconductors |
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PCA9846PWJ Datasheet(HTML) 8 Page - NXP Semiconductors |
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8 / 32 page  PCA9846 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved. Product data sheet Rev. 1 — 9 November 2015 8 of 32 NXP Semiconductors PCA9846 4-channel ultra-low voltage, Fm+ I2C-bus switch with reset 6.2.2 Device ID (PCA9846 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 (for example, NXP). • 9 bits with the part identification, assigned by manufacturer. • 3 bits with the die revision, assigned by manufacturer (for example, Rev X). The Device ID is read-only, hardwired 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 MSB 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 slave rolls back to the first byte and keeps sending the Device ID sequence until a NACK has been detected. For the PCA9846, the Device ID is shown in Figure 8. Fig 8. PCA9846 Device ID field 0 aaa-017527 0 0 1 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 revision 1 0 0 0 0 part identification manufacturer |
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