Maker : austriamicrosystems AG
Part No. : AS8228

Datasheet PDF : AS8228.pdf
Cross Reference : AS8228 Cross Reference
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Shortcut : AS8220A  AS8221  AS8228  AS8228 

Product Information

www.DataSheet4U.com AS8218 / AS8228 Highly Integrated Single Phase 2-Current Energy Metering Integrated Circuits with Microcontroller, RTC, Programmable Multi-Purpose I/Os and LCD Driver DATA SHEET 1. Key Features - - Precision single-phase, one or two current input energy measurement front-end including SigmaDelta modulators for A/D-conversion and digital signal processor (DSP). 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. Power-supply monitor (PSM) for power-on reset and reset when the supply voltage falls below a defined threshold. Customer programmable 8-bit 8051 compatible microcontroller (MCU). Programmable MCU clock with optional low power operating conditions. 2 x Universal Asynchronous Receiver / Transmitters (UART) for external communications such as programme download and debugging. Programmable watchdog timer (WDT) and external system reset pin. Real-time clock/calendar (RTC) with on-chip digital calibration and separate battery supply pin. On-chip voltage reference (VREF) with small temperature coefficient. Low power 3.0 – 4.0MHz crystal oscillator. SPI compatible interface for external EEPROM memory. Standard on-chip LCD driver (LCDD) interface. Programmable multi-purpose I/Os (MPIO) with selectable data direction, pull-up or pull-down resistors and drive strength. Mains current lead/lag status indication for reactive energy measurement. Low power battery operating mode for meter reading when Mains voltage is not present. The AS8218 and AS8228 ICs offer the following options: AS8218: 20 x 4 segment LCDD 9 x multi-purpose I/O (MPIO) AS8228: 24 x 4 segment LCDD 12 x multi-purpose I/O (MPIO) - 2. General Description The AS8218 / AS8228 are highly integrated CMOS single-phase energy metering devices for fully electronic LCD meter systems. The AS8218 / AS8228 have been designed to ensure the meters full compliance with the international Standards IEC62052 and ANSI. The AS8218 / AS8228 ICs include 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), 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-ofuse or maximum demand billing and a Serial Peripheral Interface (SPI) for reading data from and writing data to an external non-volatile memory (EEPROM). The AS8218 / AS8228 ICs have 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 provides 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 24kByte program memory and 1kByte data memory. The meter system designer can select the size of the external EEPROM memory from 1kByte to 32kByte (in binary steps). - - - - - - - - - - - - Revision 3.0, 31-May-06 Page 1 of 123 Data Sheet AS8218 / AS8228 www.DataSheet4U.com An on-chip programmable watchdog timer (WDT) is available to automatically initiate a system reset if a regular ‘hold-off’ signal is not detected. The system timing and real time clock (RTC) has a dedicated external battery supply pin (VDD_BAT), enabling the oscillator and RTC to continue during ‘power-down’. The RTC may be digitally calibrated for oscillator frequency accuracy. The LCD Driver (LCDD) block enables ...

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