ADP1047ARQZ-R7 datasheet(29/84 Pages) AD

29 / 84 page

Data Sheet

ADP1047/ADP1048

Rev. 0 | Page 29 of 84

MONITORING FUNCTIONS

Voltage, current, power, and temperature measurements are

taken by the ADP1047/ADP1048. These values are stored in

the following registers and can be read through the PMBus

interface.

•

Input voltage measurement (Register 0x88)

•

Output voltage measurement (Register 0x8B)

•

Input current measurement (Register 0x89)

•

Input power measurement (Register 0x97)

•

Temperature measurement (Register 0xFE86)

FIRST ERROR FAULT

The ADP1047/ADP1048 provide a FLAG_FAULT_ID register

(Register 0xFE07) that records the first fault that causes a system

shutdown. For example, if the overtemperature (OT) fault causes

the system to shut down, the OT_FAULT flag (0011) is stored in

the FLAG_ FAULT_ID register (Register 0xFE07, Bits[3:0]). In

addition, the flag ID of the fault that occurred before the fault

that caused the system shutdown is included in Bits[7:4] of

The contents of this register are stored until read by the user. The

flag ID is also saved in EEPROM when the shutdown occurs. In

this way, it is possible to determine the cause of a shutdown in

case of system failure.

OVERTEMPERATURE PROTECTION (OTP)

If the temperature sensed at the RTD pin exceeds the program-

mable fault threshold, the OTP flag is set, and the power supply

can be programmed to shut down. A PTC or NTC thermistor

can be used.

To set the fault and warning thresholds for OTP, program

temperature hysteresis for the fault and warning thresholds,

program Register 0xFE3F. The response to an OTP fault flag

is programmable in Register 0x50.

AC_OK AND PGOOD SIGNALS

The ADP1047/ADP1048 have two digital status pins: AC_OK

and PGOOD. Both signals represent an OR function for a pro-

grammable list of internal flags. Users can blank some of these

flags to tailor the AC_OK and PGOOD signals to their needs

using Register 0xFE0B and Register 0xFE0A, respectively.

When the signals on the AC_OK and PGOOD pins are set,

the corresponding internal flag is also set.

The programmable delay block acts like a debounce. That is, the

signal must be active for at least the duration of the programmed

delay before the flag is set. The debounce times for the AC_OK and

PGOOD pins can be programmed separately in Register 0xFE05.

REG 0xFE0A

PROGRAMMABLE

DELAY BLOCK

PGOOD_FLAGS_LIST

(PROGRAMMABLE

LIST OF FLAGS)

PGOOD

REG 0xFE0B

PROGRAMMABLE

DELAY BLOCK

AC_OK_FLAGS_LIST

(PROGRAMMABLE

LIST OF FLAGS)

AC_OK

Figure 27. AC_OK and PGOOD Signals

Table 13. Flags Available to Program the AC_OK and PGOOD Pins

AC_OK_FLAGS_LIST (Register 0xFE0B)1

PGOOD_FLAGS_LIST (Register 0xFE0A)1

VIN_LOW (always checked)

VOUT_OV_FAULT (always checked)

VIN_UV_FAULT (Bit 7)

VOUT_UV_FAULT (Bit 7)

VIN_UV_WARN (Bit 6)

VOUT_OV_WARN (Bit 6)

IIN_OC_FAULT (Bit 5)

FAST_OVP (Bit 5)

IIN_OC_WARN (Bit 4)

OLP (Bit 4)

FAST_OCP (Bit 3)

AC_LINE_PERIOD (Bit 2)

IIN_OC_FAULT (Bit 2)

BROWN_OUT (Bit 1)

OT_FAULT (Bit 1)

INRUSH (Bit 0)

FAST_LOOP (Bit 0)

1 To blank one or more flags so that the AC_OK or PGOOD pin ignores it, set the corresponding bit to 1 in Register 0xFE0A or Register 0xFE0B.

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