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ADP1047-300-EVALZ 데이터시트(PDF) 24 Page - Analog Devices |
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ADP1047-300-EVALZ 데이터시트(HTML) 24 Page - Analog Devices |
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 AVG VIN PIN IIN ADC AVG 0 LINE CYCLES TO 4096 LINE CYCLES 1 2 3 RMS RMS RMS AC 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 11 −3 to −1 256 V 0.125 V 1024 V 0.5 V IIN 11 −10 to −5 2 A 0.976 mA 64 A 0.03125 A PIN 11 −4 to +3 256 W 125 mW 32.8 kW 16 W VOUT 11 −3 to 0 256 V 0.125 V 2048 V 1 V |
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