LTC2481CDD datasheet(37/40 Pages) LINER

37 / 40 page

LTC2481

2481f

APPLICATIO S I FOR ATIO

lcd_init();

// Initialize LCD

delay_ms(6);

printf(lcd_putc, "Hello!");

// Obligatory hello message

delay_ms(500);

// for half a second

} // End of initialize()

*** main() ********************************************************************

Main program initializes microcontroller registers, then reads the LTC2481

repeatedly

*******************************************************************************/

void main()

{

signed int32 x;

// Integer result from LTC2481

float voltage;

// Variable for floating point math

int16 timeout;

initialize();

// Hardware initialization

while(1)

{

delay_ms(1);

// Pace the main loop to something more than 1 ms

// This is a basic error detection scheme. The LTC248X will never take more than

// 163.5ms, 149.9ms, or 136.5ms to complete a conversion in the 50Hz, 55Hz, and 60Hz

// rejection modes, respectively.

// If read_LTC248X() does not return non-zero within this time period, something

// is wrong, such as an incorrect i2c address or bus conflict.

if((x = read_LTC2481(LTC248XADDR, GAIN1 | VIN | R55)) != 0)

{

// No timeout, everything is okay

timeout = 0;

// reset timer

x &= 0xFFFFFFC0;

// clear config bits so they don't affect math

x ^= 0x80000000;

// Invert MSB, result is 2's complement

voltage = (float) x;

// convert to float

voltage = voltage * 5.0 / 2147483648.0;// Multiply by Vref, divide by 2^31

lcd_putc('\f');

// Clear screen

lcd_gotoxy(1,1);

// Goto home position

printf(lcd_putc, "V %01.4f", voltage); // Display voltage

}

else

{

++timeout;

}

if(timeout > 200)

{

timeout = 200;

// Prevent rollover

lcd_gotoxy(1,1);

printf(lcd_putc, "ERROR - TIMEOUT");

delay_ms(500);

}

} // End of main loop

} // End of main()

LTC2481CDD Datasheet(PDF) 37 Page - Linear Technology

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