AS8228 datasheet(15/123 Pages) AMSCO

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Data Sheet AS8218 / AS8228

Revision 3.0, 31-May-06

Page 15 of 123

A dedicated serial Universal Asynchronous Receiver/Transmitter (UART1) Interface within the System Control

is provided to communicate with the AS8218 / AS8228 ICs and perform all the required programming and

reading of data, especially during the meter production process.

The AS8218 / AS8228 ICs supply voltages (2 x VDDD and VDDA) are typically 3.3 Volts. These supply

voltages should be derived from the Vmains with the use of a standard voltage regulated power supply circuit. A

typical 3.3 Volt power supply circuit is described later.

An on-chip power supply monitor (PSM) ensures that a reset is generated independently of the supply voltage

rise and fall times. Monitoring of the Vmains is provided to ensure early power-down detection. A reset pin

(RES_N) is also available for external system reset, which is active low. The RES_N pin can be left

unconnected if not required.

The individual functional elements of the AS8218 / AS8228 ICs, as well as the relationships between the

various functional blocks are shown in the following block diagram. A detailed description of the AS8218 /

AS8228 ICs system and the flexibility available to the kWh meter designer, through the system programmability

is also described below:

System Timing &

Real Time Clock

Energy Measurement

Front End

System

Control

8051

Micro-

Controller

LCD

Driver

Multi-purpose

I/Os

SPI

Analog

Front

End

DSP

LBP3 ... 0

IO11 ... 0

LSD23 ... 0

TXD

S_N

RXD

I2N

I2P

I1N

I1P

VDD_BAT

XIN

XOUT

UART1

WDT

RES_N

Figure 2:

AS8218 / AS8228 block diagram

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