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FM24V01A-G Datasheet(PDF) 10 Page - Cypress Semiconductor |
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FM24V01A-G Datasheet(HTML) 10 Page - Cypress Semiconductor |
10 / 19 page FM24V01A Document Number: 001-90869 Rev. *H Page 10 of 19 Device ID The FM24V01A device incorporates a means of identifying the device by providing three bytes of data, which are manufacturer, product ID, and die revision. The Device ID is read-only. It can be accessed as follows: 1. The master sends a START command. 2. The master sends Reserved Slave ID 0xF8. 3. The FM24V01A sends an ACK. 4. The master sends the I2C-bus slave address of the slave device it needs to identify. The last bit is a 'Don't care' value (R/W bit). Only one device must acknowledge this byte (the one that has the I2C-bus slave address). 5. The FM24V01A sends an ACK. 6. The master sends a Re-START command. 7. The master sends Reserved Slave ID 0xF9. 8. The FM24V01A sends an ACK. 9. The Device ID Read can be done, starting with the 12 manufacturer bits, followed by the 9 part identification bits, and then the 3 die revision bits. 10.The master ends the Device ID read sequence by NACKing the last byte, thus resetting the slave device state machine and allowing the master to send the STOP command. Note The reading of the Device ID can be stopped anytime by sending a NACK command. Note Product ID bits 0 and 4 are reserved. Figure 16. Read Device ID Table 1. Device ID Device ID (3 bytes) Device ID Description 23–12 (12 bits) 11–8 (4 bits) 7–3 (5 bits) 2–0 (3 bits) Manufacturer ID Product ID Density Variation Die Rev 004101h 000000000100 0001 00000 001 S A Data Byte Data Byte 1 P By Master By F-RAM Start Address Stop No Acknowledge Data S A Rsvd Slave ID (F8) Slave Address A Start Address Acknowledge Rsvd Slave ID (F9) A A Data Byte Acknowledge |
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