AN2288 datasheet(4/29 Pages) STMICROELECTRONICS

4 / 29 page

Features

AN2288

4/29

Features

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Cost-Effective and Flexible Single-Phase Energy Meter

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ASSP is not used; microcontroller is doing all the measurements and calculations

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Fulfils IEC 61036:1996 + A1: 2000, Static meter for active energy (classes 1 and 2) for

Ib=10A and Imax=55A

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Meter starts at few mA

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Detects, Signals and Continues to Measure Accurately under tamper Condition

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Compact design with Internal Flash memory, SRAM and external EEPROM

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External EEPROM used to store calibration parameters, tampering information and

accumulated kWh. This is more secure than using internal EEPROM, as it keeps the

data away from the risk being lost on a burnt microcontroller.

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Flexibility to use External or Internal EEPROM by changing only the sales type to

ST7FLITE29 (embedded with 256 bytes of EEPROM) without changing the hardware

design

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Gain multipliers (Operation Amplifier) are used for wider range of load with Ib=10A and

Imax=5.5Ib

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Large line voltage operable range from 140V to 300V

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Active power, current, voltage, power factor and line frequency measurements

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RTC for displaying current date and time

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LCD module for display accumulated kWh, Vrms, Irms, power factor, line frequency,

current date and time

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Secure and reprogrammable Flash memory enables flexible firmware updates up to

10k cycles

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Adjustable Active Energy Pulse Output goes up to 32 000 Impulses/kWh

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Large Compensation of Phase difference generated by CTs by hardware (increasing or

decreasing capacitor values at current channel)

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One-Time, Quick, and Accurate Digital Calibration gives added benefits like more

accurate calibration and no need for Trimming external components

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