ADP1050ACPZ-R7 datasheet(28/93 Pages) AD

28 / 93 page

Data Sheet

ADP1050

First Flag ID Recording

When the ADP1050 registers one or several fault conditions,

it stores the first flag in a dedicated first flag ID register

(Register 0xFEA6). The first flag ID represents the first flag

that triggers a shutdown response. The following types of flags

are not recorded in the first flag ID register:

•

Flags that are configured to be ignored

•

Flags that have a configured response causing the PWM

outputs to be disabled, but that do not use a soft start to

reenable the PWM outputs after the fault is resolved

•

Flags that have a configured response causing the

synchronous rectifiers to be disabled

The first flag ID register gives the user more information for

fault diagnosis than a simple flag. This register also stores the

previous first fault ID.

The status of the first flag ID register can be saved to the EEPROM,

as well, by setting Register 0xFE0C[3]. To limit the number of

writes to the EEPROM, only the first flag after a VDD power reset

can be saved to the EEPROM. During the next VDD power-on,

the first flag ID is downloaded from the EEPROM and loaded

to the first flag ID register (Register 0xFEA6).

Figure 29 shows the timing diagram for the first flag ID recording

scheme. Table 7 describes the actions shown in Figure 29.

VDD

FLAG Y

FLAG Z

POWER SUPPLY

STATUS

FIRST FLAG ID

(CURRENT)

FIRST FLAG ID

(PREVIOUS)

EEPROM

UPDATE

t1 t3 t5

t2 t4

Figure 29. First Flag Timing

Table 7. First Flag ID Timing1

Step

Action

Power

Supply

First Flag ID in Register

First Flag ID in EEPROM

Previous ID

Current ID

Previous ID

Current ID

As an example, the previous ID and the current ID in the EEPROM

are 0 and Flag X, respectively. When the VDD voltage is applied on

the ADP1050, the first flag ID is downloaded from the EEPROM

to the first flag ID register (Register 0xFEA6).

Flag X

A fault (Flag Y) shuts down the power supply. In the first flag ID

flag ID. The first flag ID register is updated accordingly. The EEPROM

is then updated to save this information.

Off

Flag X

Flag Y

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 X

Flag Y

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

flag ID register and the EEPROM are not updated.

Off

Flag X

Flag Y

Flag X

Flag Y

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

Off

Flag X

Flag Y

Flag X

Flag Y

The power supply is turned on again after the flag reenable

delay. The first flag ID register is not updated.

Flag X

Flag Y

Flag X

Flag Y

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

is now the current first flag ID, and Flag Y is the previous flag ID.

The first flag ID register is updated accordingly. The EEPROM is

not updated to save the information.

Off

Flag Y

Flag Z

Flag X

Flag Y

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

Off

Flag Y

Flag Z

Flag X

Flag Y

The power supply is turned on again after the flag reenable

delay. The first flag ID register is not updated.

Flag Y

Flag Z

Flag X

Flag Y

The VDD voltage is removed and the power supply is turned off.

Off

N/A

N/A means not applicable.

Rev. A | Page 27 of 92

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