ADP1053ACPZ-R7 datasheet(31/84 Pages) AD

31 / 84 page

Data Sheet

ADP1053

Rev. A | Page 31 of 84

FIRST FLAG ID RECORDING

Figure 29 shows the timing of the first flag ID recording

scheme. Table 10 describes the actions shown in Figure 29.

When the ADP1053 registers one or more fault conditions, it

stores the first flag in a dedicated register (Register 0xFECA for

Channel A and Register 0xFECB for Channel B). The first flag ID

represents the first flag that triggers a response and requires a

soft start after the fault is resolved. The following types of flags

are not recorded in the first flag ID register:

PSON

FLAG Y

FLAG Z

POWER SUPPLY

STATUS

FIRST FLAG ID

(CURRENT)

FIRST FLAG ID

(PREVIOUS)

EEPROM

UPDATE

•

Flags that are configured to be ignored

•

Flags whose configured action causes PWM outputs to be

disabled but which do not use a soft start to reenable the

PWM outputs after the fault is resolved

For more information, see the Protection Actions section.

The first flag ID registers give the user more information for

fault diagnosis than a simple flag. These registers also store the

previous first flag ID. The status of the first flag ID registers can

be downloaded to the EEPROM (set Bit 5 of Register 0xFE08).

The contents of the first flag ID registers are stored until read

by the user. The flag ID is also saved in EEPROM. In this way,

the user can read the flag information even if the ADP1053 is

powered off.

Figure 29. First Flag ID Timing

The Channel A first flag ID register (Register 0xFECA)

records the first flag ID of the fault that shut down Channel A;

the Channel B first flag ID register (Register 0xFECB) records

the first flag ID of the fault that shut down Channel B.

The first flag ID recording function can be disabled by setting

Bit 5 to 0 in Register 0xFE08.

Table 10. First Flag ID Timing

First Flag ID Register

Step

Action

Power Supply

Flag ID

Current

Flag ID

The PSON signal turns on the power supply. The ADP1053 reads the first flag ID from

the EEPROM and saves it to the first flag ID register as both the current ID and the

previous ID.

Flag X

A fault (Flag Y) shuts down the power supply. Flag Y is now the current flag ID, and

Flag X is the previous flag ID. The first flag ID register is updated accordingly; the

EEPROM is then updated to save this information.

Off

Flag X

Flag Y

Another fault (Flag Z) occurs while the power supply is off. Because Flag Z is not

the first flag that caused the shutdown, neither the first flag ID register nor the

EEPROM is updated.

Off

Flag X

Flag Y

Flag Y is cleared, but Flag Z keeps the power supply off. The first flag ID register is

not updated.

Off

Flag X

Flag Y

Flag Z is cleared. The first flag ID register is not updated.

Off

Flag X

Flag Y

The power supply is turned on again after the reenable delay. The first flag ID

Flag X

Flag Y

The fault indicated by Flag Z shuts down the power supply. Flag Z is now the current

flag ID, and Flag Y is the previous flag ID. The first flag ID register is updated accordingly;

the EEPROM is then updated to save this information.

Off

Flag Y

Flag Z

Flag Z is cleared. The first flag ID register is not updated.

Off

Flag Y

Flag Z

The power supply is turned on again after the reenable delay. The first flag ID

Flag Y

Flag Z

PSON turns off the power supply.

Off

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