ADP1050ACPZ-R7 datasheet(45/93 Pages) AD

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ADP1050

Data Sheet

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

downloaded into the internal registers, powering up the

ADP1050 in a state previously saved by the user.

•

On execution of the RESTORE_USER_ALL command

(Register 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 Settings to Registers

The factory default settings are stored in Page 0 of the EEPROM

main block. The factory settings can be downloaded from the

EEPROM into the internal registers, using the RESTORE_

DEFAULT_ALL command (Register 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 scratch pad

located in Page 0 of the EEPROM main block. This is to prevent

the user from accidentally overriding the factory trim settings

and the default register settings.

Save Register Settings to the 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 (Register 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

automatically performs a page erase on Page 1 of the EEPROM

main block, after which the registers are stored in the EEPROM.

Therefore, it is important to wait at least 40 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 and the internal registers are consistent,

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 is saved that sums all

1s from the values loaded into the registers. 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 CRC_FAULT flag is set (Register 0xFEA2[2]).

To read the EEPROM CRC checksum value, execute the

EEPROM_CRC_CHKSUM command (Register 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.

Rev. A | Page 44 of 92

ADP1050ACPZ-R7 数据表(PDF) 45 Page - Analog Devices

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