ADP1055ACPZ-R7 datasheet(45/140 Pages) AD

45 / 140 page

Data Sheet

ADP1055

Rev. A | Page 45 of 140

BLACK BOX READBACK

Two dedicated commands can be used to read back the contents

of the black box data stored in the EEPROM. The READ_

BLACKBOX_CURR command (Register 0xF2) is a block read

command that returns the current record N (last record saved)

with all related data, as defined in the Black Box Contents section.

The READ_BLACKBOX_PREV command (Register 0xF3) is a

block read command that returns the data for the previous record

N − 1 (next-to-last record saved). Because these commands are

block read commands, the first byte received is called the

BYTE_COUNT and indicates to the PMBus master how many

more bytes to read. In the ADP1055, BYTE_COUNT = 36.

For information about how to read from the EEPROM directly

using these commands, see the Read Operation (Byte Read and

Block Read) section. It is recommended that the GUI be used to

read back the contents of the black box; the black box data is

readily available in the GUI, which displays the data in a graphical

format.

BLACK BOX POWER SEQUENCING

When the ADP1055 is powered up, the contents of the user

settings in the EEPROM are downloaded into the internal

registers. Immediately after this, the contents of the black box

data (that is, Page 2 and Page 3) are read from the EEPROM by

the device to determine the last valid Rec_No saved and to

determine whether a page erase operation is required before

starting up the device in normal mode.

If the highest Rec_No is located on the last record of either page

(that is, the next record to store data is at the start of the other

page) and the other page has not been erased, the ADP1055

automatically initiates a page erase to the other page to prepare

it for further black box recording. The ADP1055 performs a

soft start sequence only after the page erase is completed.

ADP1055ACPZ-R7 Folha de dados(PDF) 45 Page - Analog Devices