AVR465 datasheet(21/40 Pages) ATMEL

21 / 40 page

AVR465

2566A-AVR-07/04

As a summary, some firmware defaults are shown in the table below.

Table 7.

Firmware Defaults.

Parameter

Value

Note

Compiler

IAR 3.10

Device

ATmega88

8kB FLASH, 1024b RAM, 512b EEPROM

Starting current

2mA

See I_MIN constant

Calculation cycle

200ms

See system clock and NMAX constant

Energy pulse rate

10000 imp/kWh

See MC calibration coefficient

Energy pulse length

50ms

See system clock and OCR1B initialisation

Display pulse rate

100 imp/kWh

See DPC calibration coefficient

Display pulse length

100ms

See system clock and DP_ON constant

Terminal setting

38400 bauds

See USART initialisation

Setting Up the Meter

In stand-alone mode the meter only needs to be attached to the mains wires. During

calibration and testing, the meter must be connected to a computer terminal via the

serial interface and for programming purposes the meter must be connected to a

computer via the In-System Programming (ISP) interface.

It is recommended to isolate the meter from other hardware using optocouplers.

The meter must be operated with care when connected to mains (high voltage) lines.

One common pitfall is to neglect ground wirings and nonchalantly proceed with

connecting the meter to external hardware, such as a personal computer. The results

can be destructive.

Figure 11.

Short Circuit between Live and Neutral Wire.

OTHER

HARDWARE

465

SHORT

CIRCUIT

The meter has no galvanic isolation from live wires, which means even the apparently

harmless meter ground is firmly bolted to the live voltage. Connecting the meter to

another mains-powered hardware can lead to short-circuit between live and neutral

wires, as shown in the figure above. Not a recommend thing to do.

Summary:

Defaults

Warning:

Ground Precaution

AVR465 데이터시트(PDF) 21 Page - ATMEL Corporation

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