Single Phase Energy Meter IC - AS8267 - austriamicrosystems

austriamicrosystems introduced the AS8267 single phase energy meter IC. The new energy meter IC features secure data protection and durable program memory over an extreme temperature range. The embedded logic and microcontroller enable easy and versatile customization to the user's requirements. All anti-tamper measures are integrated in the AS8267 and any attempts of fraud are monitored. Embedded features like LCD drivers, temperature sensor and real-time clock keep the list of external components to the minimum.

About austriamicrosystems
austriamicrosystems (SWX:AMS) is a leading designer and manufacturer of high performance analog ICs, combining more than 25 years of analog design capabilities and system know-how with its own state-of-the-art manufacturing and test facilities. austriamicrosystems leverages its expertise in low power and high accuracy to provide industry-leading customized and standard analog products. austriamicrosystems focuses on the areas of power management, sensors & sensor interfaces, portable audio and car access in its markets Communications, Industry & Medical and Automotive.

austriamicrosystems AS8267 Single Phase Energy Meter Block Diagram

Key features of AS8267 Single Phase Energy Meter IC:

• Precision single-phase, one or two current input energy measurement front-end including Sigma-Delta modulators for A/D-conversion and digital signal processor (DSP).
• Power-supply monitor (PSM) for power-on reset and reset when the supply voltage falls below a defined threshold.
• Low current consumption of 5mA, depending on MCU activity.
• Digital phase correction and selectable gain on both current channels for use with two current transformers (CT) or one CT and one shunt.
• Customer programmable 8-bit 8051 compatible microcontroller (MCU).
• Highly reliable 32kBytes of non-volatile Flash memory is provided on-chip for storage of both program and data.
• Programmable MCU clock for optional low power operating conditions.
• Program and data security is provided by optional password and attack counter protection.
• Programmable watchdog timer (WDT) and external system reset pin.
• Real-time clock/calendar (RTC) with on-chip digital calibration and separate battery supply pin.
• 2 x Universal Asynchronous Receiver / Transmitters (UART) for external communications such as programme download and debugging.
• On-chip temperature sensor for optional temperature compensation.
• Low power 3.0 – 4.0MHz crystal oscillator.
• On-chip voltage reference (VREF) with small temperature coefficient (15ppm/K typ.).
• SPI compatible interface for optional external non-volatile EEPROM memory selectable up to 32kBytes.
• Standard on-chip 80-segment LCD driver (LCDD) interface.
• 9 x programmable multi-purpose I/Os (MPIO) with selectable data direction, pull-up or pull-down resistors and drive strength.
• Low power battery operating mode for meter reading when Mains voltage is not present.
• Mains current lead/lag status indication for reactive energy measurement.

The AS8267 is highly integrated CMOS single-phase energy metering devices for fully electronic LCD meter systems. The AS8267 has been designed to ensure a meters full compliance with the international Standards IEC62052 and ANSI. The AS8267 IC includes all the functions required for conventional 1 current or 2-current anti-tamper meters. The functions include precision energy measurement, an 8-bit microcontroller unit (MCU) with 32kBytes of Flash memory, an on-chip Liquid Crystal Display driver (LCDD), programmable multi- purpose Inputs/Outputs (MPIO), a real time clock/calendar (RTC) for complex tariff functions such as time-of-use or maximum demand billing and a Serial Peripheral Interface (SPI) for reading data from and writing data to an optional external non-volatile memory (EEPROM). The AS8267 IC has a dedicated energy measurement front-end, which includes an analog front-end and programmable Digital Signal Processor (DSP) from which active energy, mains voltage and mains current are provided. Reactive and apparent energy can also be calculated.

The on-chip 8-bit 8051 compatible microcontroller is freely programmable and provides user access to the various functional blocks. The dedicated Universal Asynchronous Receiver / Transmitter (UART1) in the System Control block allows access to various system functions and blocks. A second UART (UART2) is also provided, which may for example be used for debugging. The on-chip memory includes 32kByte of highly reliable non-volatile Flash program (and data) memory and 1kByte volatile data memory. The meter system designer also has the option of an additional external EEPROM memory, which is selectable in size from 1kByte to 32kByte (in binary steps).

The 9 programmable multi-purpose I/O pins (MPIO) may be independently configured as inputs or outputs. All the I/O pins are programmable for data direction, pull-up/pull-down resistors and drive strength (4mA/8mA). Typical functions may include LED energy consumption pulse output, energy direction and fault condition indication depending on current 1 or current 2 being active for the energy calculation, push button for display scrolling, mains isolation relay control for prepayment meters, optical interface etc.

The AS8267 is available in a LQFP-64 pin package and is pin compatible with the currently available AS8268, AS8218 and AS8228 ICs.

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