New single phase, anti-tamper LCD energy metering IC


ICUnterpremstaetten, Austria  — (METERING.COM) — April 20, 2007 – The AS8268 single phase system-on-chip metering IC with embedded Flash memory has been launched by austriamicrosystems.

The AS8268 offers an integrated system-on-chip solution for LCD meters. Meter implementations based on the AS8268 require a minimum of external components, inherently improving meter reliability and reducing meter system cost.

The AS8268 incorporates all the required functional blocks for single phase metering including a precision energy measurement front-end, an 8-bit microcontroller, 32 kB of on-chip Flash memory, a real-time clock, 96-segment liquid crystal display (LCD) driver, 12 programmable multi-purpose inputs/outputs for customer-specified interfaces and display requirements, as well as an on-chip temperature sensor.

The AS8268 offers the option of using an external EEPROM of 2 to 32 kB for data retention. Two universal asynchronous receiver transmitters (UARTs) provide for external communication. A programmable energy LED pulse output can be displayed through one of the multi-purpose input/outputs, which along with the on-chip pulse counter allows for the option of fast automatic digital calibration. The on-chip ±1.4ppm real-time clock/calendar (RTC) with two alarm registers and battery back-up allows complex tariff applications, with the option of added precision through the temperature sensor.

Active energy, MAINS voltage and MAINS current is calculated directly within the on-chip digital signal processor (DSP). Reactive power and apparent power can also be calculated by user configurable application software.

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

Samples of the AS8268 will be available later in Q2 2007.