AS8267 datasheet(1/136 Pages) AMSCO

Part #	AS8267

Description	Single-Phase 2-Current Energy Measurement Integrated Circuits with Microcontroller, RTC, Programmable Multi-Purpose I/Os

PDF	136 Pages

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Manufacturer	AMSCO [ams AG]

Direct Link	http://www.ams.com

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Revision 1.0, 19-Jun-07

Page 1 of 136

1. Key Features

-

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).

-

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 for optional low

power operating conditions.

-

Highly reliable 32kBytes of non-volatile Flash

memory is provided on-chip for storage of both

program and data.

-

Program and data security is provided by

optional password and attack counter

protection.

-

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 temperature sensor for optional

temperature compensation.

-

On-chip voltage reference (VREF) with small

temperature coefficient (15ppm/K typ.).

-

Low power 3.0 – 4.0MHz crystal oscillator.

-

SPI compatible interface for optional external

non-volatile EEPROM memory selectable up to

32kBytes.

-

Mains current lead/lag status indication for

reactive energy measurement.

-

Low power battery operating mode for meter

reading when Mains voltage is not present.

-

AS8267: 20 x 4 segment LCDD

9 x multi-purpose I/O (MPIO)

-

AS8268: 24 x 4 segment LCDD

12 x multi-purpose I/O (MPIO)

2. General Description

The AS8267 / AS8268 are highly integrated CMOS

single-phase energy metering devices for fully

electronic LCD meter systems. The AS8267 /

AS8268 have been designed to ensure a meters

full compliance with the international Standards

IEC62052 and ANSI.

The AS8267 / AS8268 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) 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 / AS8268 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 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

AS8267 / AS8268

Single-Phase 2-Current Energy Measurement Integrated Circuits

with Microcontroller, RTC, Programmable Multi-Purpose I/Os,

LCD Driver and On-Chip FLASH Memory

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