ADP1048ARQZ-R7 datasheet(25/84 Pages) AD

25 / 84 page

Data Sheet

ADP1047/ADP1048

Rev. 0 | Page 25 of 84

POWER SUPPLY SYSTEM AND FAULT MONITORING

The ADP1047/ADP1048 have extensive system and fault mon-

itoring capabilities. The system monitoring functions include

voltage, current, power, and temperature readings. The fault

conditions include out of limit for current, voltage, power, and

temperature. The limits for the fault conditions are programmable.

An extensive set of flags is set when certain thresholds or limits

are exceeded. These flags are described in Table 11 and Table 12.

FLAG CONVENTIONS

A flag indicates a fault condition; therefore, a flag is set (equal to

1, or high) when the fault or bad condition occurs. Good flags,

such as POWER_GOOD# and AC_OK, are active low flags. For

example, POWER_GOOD# = 1 indicates a problem.

Note that the signals relative to a flag are active high. For

example, if the POWER_GOOD# flag is set to 1, the PGOOD

pin is at Logic Level 0 because the POWER_GOOD# flag is

inverted at the pin to provide active high signals.

MANUFACTURER-SPECIFIC FLAGS

The manufacturer-specific flags are flags that are not covered by

the PMBus specification. Some flags simply indicate a condition

(typically, warning flags). The response to some of the flags is

individually programmable (typically, fault flags).

There is also a set of latched fault registers. These registers con-

tain the same flags, but the flags remain set to allow users to detect

an intermittent fault. Reading a latched register resets the flags

in that register. The latched fault registers are Register 0xFE80,

Table 11. Summary of Manufacturer-Specific Flags

Bit Name

Address

Description (1 = Flag Set)

Action

MAX_MODULATION

0xFE80[7]

The maximum modulation limit is reached.

MIN_MODULATION

0xFE80[6]

The minimum modulation limit is reached.

OLP

0xFE80[5]

Signals a difference of more than ~100 mV between the VFB and OVP signals

(one of the two voltage dividers is probably disconnected or malfunctioning).

Programmable

FAST_OVP

0xFE80[4]

The threshold set for the comparator on the OVP pin has been crossed.

Programmable

AC_PERIOD

0xFE80[3]

The controller is not able to detect the ac line period; the maximum value of

the period is used and this flag is set.

BROWN_OUT

0xFE80[2]

VAC is lower than the value stored in VIN_ON (Register 0x35).

Can set AC_OK flag

SOFT_START

0xFE80[1]

The system is in soft start sequence; fast loop filter is in use.

INRUSH

0xFE80[0]

INRUSH control relay is off.

INRUSH pin (can also

set AC_OK flag)

EEPROM_UNLOCKED

0xFE81[6]

EEPROM is unlocked and its contents can be written.

EEPROM_CRC

0xFE81[5]

The downloaded contents of the EEPROM are incorrect.

I2C_ADDRESS

0xFE81[4]

The resistor on the ADD pin has a value that can cause an error in the address

assignment (the address falls too close to the threshold between two

addresses).

LOW_LINE

0xFE81[3]

The input voltage is higher than the high line threshold.

Programmable

FAST_OCP

0xFE81[2]

The threshold set for the comparator on the ILIM pin has been crossed.

Programmable

SYNC_LOCK

0xFE81[1]

External synchronization frequency is locked.

AC_OK

0xFE81[0]

The output of the AC_OK pin is low. (This flag is a programmable combination

of other internal flags and refers to the condition of the input voltage.)

AC_OK pin

LOW_POWER

0xFE82[5]

The input power has dropped below the threshold for low power mode

operation.

Programmable

FAST_LOOP

0xFE82[4]

The fast loop compensation filter is in use.

Can set

POWER_GOOD# flag

VCORE_OV

0xFE82[3]

An overvoltage condition is present on the VCORE rail.

Programmable

VDD_3.3V_OV

0xFE82[2]

An overvoltage condition is present on the VDD rail.

Programmable

VDD_3.3V_UV

0xFE82[1]

An undervoltage condition is present on the VDD rail.

Shutdown

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