AS8218BLQW Ver la hoja de datos (PDF) - austriamicrosystems AG

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Fabricante

AS8218BLQW

Highly Integrated Single Phase 2-Current Energy Metering Integrated Circuits with Microcontroller, RTC, Programmable Multi-Purpose I/Os and LCD Driver

austriamicrosystems AG 

Data Sheet AS8218 / AS8228

Ni =

PR(ref )

LED Pulse Rate(mconst)

Where PR(ref) is the reference meter constant.

LED Meter Constant (non-standard):

The LED pulses are derived directly from the fast internal pulses (204,800i/kWh) and is specified using the

parameter ‘mconst’ of SREG. If the target meter constant is different from one of the selectable (mconst) meter

constants, the following formula applies:

(Ideal Pulse _ lev × Ni )

Na

Where Ni is calculated using the Target Pulse Rate:

Ni = Re ference Meter Cons tan t

T arg et Pulse Rate

NB: For mconst, select a pulse rate close to Target Pulse Rate, so that the Pulse_lev stays within reasonable

limits.

14. Terminology

AFE

-

CT

-

DSP

-

EEPROM

-

I_RAM

-

kB

-

LBPx

-

LCD

-

LCDD

-

LED

-

LP_DIV

-

LP_OSC

-

LSB

-

LSDx

-

MCU

-

MDR

-

MPIO

-

MSB

-

P_ACCU

-

PF

-

PLP

-

P_RAM

-

PSM

-

Analog front end

Current transformer

Digital signal processor

Electrically erasable programmable read only memory

8051 internal memory

kilobyte

LCD back-plane driver pin

Liquid crystal display

Liquid crystal display driver

Light-emitting diode

Low power divider

Low power oscillator

Least significant bit

LCD segment driver pin

Microcontroller unit

Meter data register (in DSP block)

Programmable multi-purpose input/output

Most significant bit

Power accumulator for real power

Power factor

Power low pass filter

Program memory

Power-supply monitor

Revision 3.0, 31-May-06

Page 121 of 123

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