ADP1048ARQZ-R7 datasheet(24/84 Pages) AD

24 / 84 page

ADP1047/ADP1048

Data Sheet

Rev. 0 | Page 24 of 84

ADVANCED INPUT POWER METERING

The ADP1047/ADP1048 monitor and communicate critical

information, including input and output voltage, input and

output current, temperature, and efficiency. They also monitor

and communicate OVP, UVP, OCP, OTP, and open-loop protec-

tion functions. An I2C interface reads all these values and flags

and programs their thresholds. The on-chip EEPROM can be

used to store all of the settings for the thresholds.

True rms values are calculated at the end of each half ac line

cycle by integrating the instantaneous values across each line

cycle. These values have a resolution of 11 bits and are used to

calculate the average, but are not available to be read through

the PMBus interface.

The averaging window is programmable from zero full line

cycles to 4096 full line cycles using Register 0xFE3A. At the

end of each averaging period, the new value for average power

is written to the READ_PIN register (Register 0x97) and is

available to be read back through the interface until it is

overwritten by the next averaged value at the end of the next

averaging period.

For this reason, the polling frequency used to read average

power through the PMBus interface must be equal to or higher

than the averaging window to maintain data integrity. The

averaging window is programmable over a wide range of times

to accommodate different situations.

Input voltage, input current, output voltage, and input power

are reported in linear format in the following registers:

•

Input voltage: READ_VIN (Register 0x88)

•

Input current: READ_IIN (Register 0x89)

•

Output voltage: READ_VOUT (Register 0x8B)

•

Input power: READ_PIN (Register 0x97)

CS+

PGND

VAC

CS–

ADC

AVG

VIN

IIN

ADC

AVG

0 LINE CYCLES

TO 4096

LINE CYCLES

RMS

SYNC

Figure 24. Block Diagram of Power Monitoring

Table 10. Data Format and Range for VIN, IIN, PIN, and VOUT

Metering Data

Mantissa (Bits)

Exponent (N)

Minimum Range

Minimum LSB

Maximum Range

Maximum LSB

VIN

−3 to −1

256 V

0.125 V

1024 V

0.5 V

IIN

−10 to −5

2 A

0.976 mA

64 A

0.03125 A

−4 to +3

256 W

125 mW

32.8 kW

16 W

VOUT

−3 to 0

256 V

0.125 V

2048 V

1 V

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