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AVR465 Datasheet(PDF) 21 Page - ATMEL Corporation

Part # AVR465
Description  Single-Phase Power/Energy Meter with Tamper Detection
PDF  40 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AVR465 Datasheet(HTML) 21 Page - ATMEL Corporation

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AVR465
21
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
LN
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



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