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ADP1053ACPZ-RL Datasheet(PDF) 40 Page - Analog Devices |
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ADP1053ACPZ-RL Datasheet(HTML) 40 Page - Analog Devices |
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40 / 84 page  ADP1053 Data Sheet Rev. A | Page 40 of 84 EEPROM PASSWORD On power-up, the EEPROM is locked and protected from accidental writes or erases. Only reads from Page 2 to Page 15 are allowed when the EEPROM is locked. Before any data can be written (programmed) to the EEPROM, the EEPROM must be unlocked for write access. After it is unlocked, the EEPROM is opened for reading, writing, and erasing. On power-up, Page 0 and Page 1 are also protected from read access, and the EEPROM must first be unlocked to read these pages. Unlock the EEPROM To unlock the EEPROM, perform two consecutive writes with the correct password (default = 0xFF) using the EEPROM_ PASSWORD command (Command 0xD5). The EEPROM_ UNLOCKED flag (Bit 4 of Register 0xFEC3) is set to indicate that the EEPROM is unlocked for write access. Lock the EEPROM To lock the EEPROM, write any byte other than the correct password using the EEPROM_PASSWORD command (Command 0xD5). The EEPROM_UNLOCKED flag is cleared to indicate that the EEPROM is locked from write access. Change the EEPROM Password To change the EEPROM password, first write the correct password using the EEPROM_PASSWORD command (Command 0xD5). Immediately write the new password using the same command. The password is now changed to the new password. DOWNLOADING EEPROM SETTINGS TO INTERNAL REGISTERS Download User Settings to Registers The user settings are stored in Page 1 of the EEPROM main block. These settings are downloaded from the EEPROM into the registers under the following conditions: • On power-up. The user settings are automatically down- loaded into the internal registers, powering the part up in a state previously saved by the user. • On execution of the RESTORE_USER_ALL command (Command 0x16). This command allows the user to force a download of the user settings from Page 1 of the EEPROM main block into the internal registers. Download Factory Default Settings to Registers The factory default settings are stored in Page 0 of the EEPROM main block. The factory default settings can be downloaded from the EEPROM into the internal registers using the RESTORE_ DEFAULT_ALL command (Command 0x12). When this command is executed, the EEPROM password is also reset to the factory default setting of 0xFF. SAVING REGISTER SETTINGS TO THE EEPROM The register settings cannot be saved to the factory default set- tings located in Page 0 of the EEPROM main block. This is to prevent the user from accidentally overriding the factory trim settings and default register settings. Save Register Settings to User Settings The register settings can be saved to the user settings located in Page 1 of the EEPROM main block using the STORE_USER_ALL command (Command 0x15). Before this command can be executed, the EEPROM must first be unlocked for writing (see the Unlock the EEPROM section). After the register settings are saved to the user settings, any subsequent power cycle automatically downloads the latest stored user information from the EEPROM into the internal registers. Note that execution of the STORE_USER_ALL command auto- matically performs a page erase to Page 1 of the EEPROM main block, after which the register settings are stored in the EEPROM. Therefore, it is important to wait at least 35 ms for the operation to complete before executing the next PMBus command. EEPROM CRC CHECKSUM As a simple method of checking that the values downloaded from the EEPROM are consistent with the internal registers, a CRC checksum is implemented. • When the data from the internal registers is saved to the EEPROM (Page 1 of the main block), the total number of 1s from all the registers is counted and written into the EEPROM as the last byte of information. This is called the CRC checksum. • When the data is downloaded from the EEPROM into the internal registers, a similar counter that sums all 1s from the values loaded into the registers is saved. This value is compared with the CRC checksum from the previous upload operation. If the values match, the download operation was successful. If the values differ, the EEPROM download operation failed, and the EEPROM_CRC fault flag is set (Bit 1 of Register 0xFEC2). To read the EEPROM CRC checksum value, execute the EEPROM_CRC_CHKSUM command (Command 0xD1). This command returns the CRC checksum accumulated in the counter during the download operation. Note that the CRC checksum is an 8-bit cyclical accumulator that wraps around to 0 when 255 is reached. |
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Similar Description - ADP1053ACPZ-RL |
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