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FM24V10-G Folha de dados(PDF) 9 Page - Ramtron International Corporation |
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FM24V10-G Folha de dados(HTML) 9 Page - Ramtron International Corporation |
9 / 15 page FM24V10 - 1Mb I2C FRAM Rev. 1.1 Feb. 2009 Page 9 of 15 Device ID The FM24V10 and FM24VN10 devices incorporate 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 master sends the I2C-bus slave address of the slave device it needs to identify. The last two bits are ‘Don’t care’ values (Page Select and R/W bits). Only one device must acknowledge this byte (the one that has the I2C-bus slave address). 4. The master sends a Re-START command. 5. The master sends Reserved Slave ID 0xF9 6. 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. 7. 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. S A Data Byte Data Byte 1 P By Master By FM24V10 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 X X Figure 13. Read Device ID Manufacturer ID Product ID Die Rev. 11 10 9 8 7 6 5 4 3 2 1 0 8 7 6 5 4 3 2 1 0 2 1 0 Ramtron Density Variation 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 N V V V 0 0 0 0 Figure 14. Manufacturer and Product ID Density: 02h=256Kb, 03h=512Kb, 04=1Mb Variation: Product ID bit 4 = S/N, Product ID bits 3-1 = VTP option, Product ID bit 0 = reserved The 3-byte hex code for an FM24V10 will be: 0x00 0x44 0x00 The 3-byte hex code for an FM24VN10 will be: 0x00 0x44 0x80 The 3-byte hex code for an FM24VR10-G1 will be: 0x00 0x44 0x10 The 3-byte hex code for an FM24VR10-G2 will be: 0x00 0x44 0x20 The 3-byte hex code for an FM24VRN10-G1 will be: 0x00 0x44 0x90 The 3-byte hex code for an FM24VRN10-G2 will be: 0x00 0x44 0xA0 |
Nº de peça semelhante - FM24V10-G |
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Descrição semelhante - FM24V10-G |
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