AS8228(2005) 查看數據表（PDF） - austriamicrosystems AG

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AS8228
(Rev.:2005)

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

austriamicrosystems AG 

Features AS8218 / AS8228

down’. The RTC may be digitally calibrated for

oscillator frequency accuracy. The LCD Driver

(LCDD) block enables the display of information

provided by the microcontroller, directly to the LCD.

Two dedicated data register banks are provided to

simplify programming, particularly in the case

where the display data needs to be scrolled.

The programmable multi-purpose I/O pins (MPIO)

may be independently configured as dedicated

inputs or outputs. All the I/O pins are

programmable for data direction, pull-up/pull-down

resistors and drive strength (4mA/8mA). Such

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.

An on-chip analog ground buffer (ABUF) and

voltage reference (VREF) ensures that no external

circuitry is required. A power-supply monitor (PSM)

provides a reset, when VDD falls below a safe

operating threshold.

The AS8218 / AS8228 ICs are available in a

LQFP64 plastic package.

3. AS8218 / AS8228 Block Diagram

XIN XOUT

VDD_BAT

VP

VN

I1P

I1N

I2P

I2N

RXD

TXD

System Timing &

Real Time Clock

Energy Measurement

Front End

Analog

Front

End

DSP

UART1

System

Control

8051

Micro-

Controller

LCD

Driver

LBP3 ... 0

LSD23 ... 0

Multi-purpose

I/Os

IO11 ... 0

SC

S_N

SPI

SO

SI

Figure 1: AS8218 / AS8228 block diagram

4. Contact

austriamicrosystems AG

A 8141 Schloss Premstaetten, Austria

T. +43 3136 500 0

F. +43 3136 525 01

info@austriamicrosystems.com

Revision 2.1, 06-Oct-05

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