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FM25V02-G Datasheet(PDF) 9 Page - Cypress Semiconductor |
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FM25V02-G Datasheet(HTML) 9 Page - Cypress Semiconductor |
9 / 17 page FM25V02 - 256Kb SPI FRAM Rev. 3.0 Jan. 2012 Page 9 of 17 Sleep Mode A low power mode called Sleep Mode is implemented on the FM25V02 and FM25VN02 device. The device will enter this low power state when the SLEEP op-code B9h is clocked-in and a rising edge of /S is applied. Once in sleep mode, the C and D pins are ignored and Q will be high-Z, but the device continues to monitor the /S pin. On the next falling edge of /S, the device will return to normal operation within tREC (400 s max.). The Q pin remains in a hi-Z state during the wakeup period. The device will not necessarily respond to an opcode within the wakeup period. To start the wakeup procedure, the controller may send a “dummy” read, for example, and wait the remaining tREC time. Figure 12. Sleep Mode Entry Device ID The FM25V02 and FM25VN02 device can be interrogated for its manufacturer, product identification, and die revision. The RDID op-code 9Fh allows the user to read the manufacturer ID and product ID, both of which are read-only bytes. The JEDEC-assigned manufacturer ID places the Ramtron identifier in bank 7, therefore there are six bytes of the continuation code 7Fh followed by the single byte C2h. There are two bytes of product ID, which includes a Family code, a Density code, a Sub code, and Product Revision code. Table 6. Manufacturer and Product ID Bit 7 6 5 4 3 2 1 0 Hex Manufacturer ID 0 1 1 1 1 1 1 1 7F Continuation code 0 1 1 1 1 1 1 1 7F Continuation code 0 1 1 1 1 1 1 1 7F Continuation code 0 1 1 1 1 1 1 1 7F Continuation code 0 1 1 1 1 1 1 1 7F Continuation code 0 1 1 1 1 1 1 1 7F Continuation code 1 1 0 0 0 0 1 0 C2 JEDEC assigned Ramtron C2h in bank 7 Family Density Hex Device ID (1 st Byte) 0 0 1 0 0 0 1 0 22h Density: 01h=128K, 02h=256K, 03h=512K, 04=1M Sub Rev. Rsvd Device ID (2 nd Byte) 0 0 0 0 0 0 0 0 00h 00h=FM25V02, 01h=FM25VN02 Figure 13. Read Device ID S C D Q Enter Sleep Mode S C D Q 7Fh … 7Fh C2h 00h Six bytes of continuation code 7Fh 9Fh 22h 1 6 . . . . . . . |
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