ADP1055ACPZ-R7 datasheet(30/140 Pages) AD

30 / 140 page

ADP1055

Data Sheet

Rev. A | Page 30 of 140

Figure 41. Logical Functions Available Using PGOOD1 (LOGIC) PGOOD2

Various flags can be programmed into PGOOD1 and PGOOD2

using Register 0xFE44 and Register 0xFE45. When coupled

with the GPIOs, these flags can be used to trigger signals to

provide external logic functions by means of discrete circuits.

For example, in Figure 42, the overtemperature flag or the

VIN_UV flag can set PGOOD2. This feature is useful for

signaling the power chain downstream so that any appropriate

action can be taken. A delay (debounce) can be added to the

PGOODx signals using Register 0xFE43.

Figure 42. Signals Routed into PGOOD1 and PGOOD2

In addition to triggering the GPIOs, the PGOOD1_FAULT

and PGOOD2_FAULT flags are set in Register 0xFE93[6]

(FAULT_UNKNOWN[6]) and Register 0xFE93[7] (FAULT_

UNKNOWN[7]) (where 0 means no fault). The same debounce

applies to the flags.

The POWER_GOOD_ON register (Register 0x5E) sets the voltage

that the output voltage must exceed before POWER_GOOD can

be set. Similarly, the output voltage must fall below the

POWER_GOOD_OFF threshold (set in Register 0x5F) for

POWER_GOOD to be reset.

Figure 43. POWER_GOOD Flag Tripped by VOUT

Note that the PMBus signal POWER_GOOD cannot be brought

out to the GPIOx pins, but it can be brought out to the SMBALRT

pin. The PMBus signal POWER_GOOD is accessible through

STATUS_WORD (Register 0x79[11]). POWER_GOOD is

asserted (0 means power is good) only if all of the following

conditions are met:



VOUT has exceeded POWER_GOOD_ON.



VOUT has not fallen below POWER_GOOD_OFF.



PGOOD1_FAULT is not set.



PGOOD2_FAULT is not set.

UVP is not associated with this flag; however, the PGOOD1_

FAULT and PGOOD2_FAULT flags can be programmed to

select UVP (VOUT_UV_FAULT). There is no debounce for

POWER_GOOD.

Figure 44. POWER_GOOD Signal Path

VOUT NOMINAL

VOUT_UV

POWER_GOOD

PSON

TIME

POWER_GOOD_ON

VOUT_UTHD

SET AND

RESET LOGIC

VOUT

RESET

POWER_GOOD_OFF

VOUT_LTHD

SET

PGOOD1_FAULT

POWER_GOOD

PGOOD2_FAULT

OFF

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