AVR465 datasheet(23/40 Pages) ATMEL

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AVR465

2566A-AVR-07/04

Figure 13.

Example Set-Up for Calibration and/or Metering.

To download the firmware into the meter first open the compiler workspace, compile

the project and use AVR Studio to send the compiled file to the target, as described

above. Alternatively, use AVR Studio to send the precompiled firmware directly to the

target.

Set up fuses to match hardware environment. The default is to use external crystal,

with full output swing and long start-up time. This means fuses CKSEL are set to

0111 and fuses SUT to 11. Fuses CKDIV8 and CKOUT should be unprogrammed.

Calibration Example

There are many methods for calibrating the meter. Here is presented one. This

method requires a programmable, high-voltage, high-current signal generator. Also

required is hardware for programming the AVR in the meter. An STK500 can be used,

but a debugger such as JTAGICE mkII is recommended, since it allows EEPROM to

be edited more easily.

Connect the signal generator to the meter front-end. Then connect the meter to a PC

using a RS-232 buffer circuit, such as the spare RS-232 interface on the STK500.

Start a terminal software on the PC and configure it to receive data from the meter.

Start by writing the following set of calibration coefficients to EEPROM. This will set

phase calibration to zero and gain to unity in all calculations.

Table 8.

Initialization of Calibration Coefficients.

ADDR.

+ 0x00

+ 0x01

+ 0x02

+ 0x03

+ 0x04

+ 0x05

+ 0x06

+ 0x07

0x00

0x01

0x08

0x00

0x01

0x00

0x01

0x00

0x01

0x00

0x01

0x10

0x00

0x01

0xFF

0x27

0x10

0x00

0x64

0x18

0x00

0x43

0x57

0x00

If using a programmer, create a text file as shown below and load the contents of the

file into the EEPROM. The file content is of type Intel Hex.

Firmware Set-Up

Set-Up

Step 1 - Initialisation

465

RS232 SPARE

SIGNAL

GENE-

RATOR

HIGH VOLTAGE

HIGH CURRENT

STK500

RS232 CTRL

RS232 SPARE

ISP6PIN

COM1

COM2

RxD

/RST

SCK

MOSI

VOUT

VIN

GND

TxD

MISO

GALVANIC ISOLATION

"SAFE" SIDE

POWER SUPPLY

AVR Studio

Terminal

AVR465 Datasheet(PDF) 23 Page - ATMEL Corporation

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