LTC2481CDD datasheet(36/40 Pages) LINER

Part #	LTC2481CDD

Description	16-Bit ?誇 ADC with Easy Drive Input Current Cancellation and I2C Interface

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC2481

2481f

APPLICATIO S I FOR ATIO

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

signed int32 read_LTC2481(char addr, char config)

{

struct fourbytes

// Define structure of four consecutive bytes

{

// To allow byte access to a 32 bit int or float.

int8 te0;

//

int8 te1;

// The make32() function in this compiler will

int8 te2;

// also work, but a union of 4 bytes and a 32 bit int

int8 te3;

// is probably more portable.

};

union

// adc_code.bits32

all 32 bits

{

// adc_code.by.te0

byte 0

signed int32 bits32;

// adc_code.by.te1

byte 1

struct fourbytes by;

// adc_code.by.te2

byte 2

} adc_code;

// adc_code.by.te3

byte 3

// Start communication with LTC2481:

i2c_start();

if(i2c_write(addr | WRITE))// If no acknowledge, return zero

{

i2c_stop();

return 0;

}

i2c_write(config);

i2c_start();

i2c_write(addr | READ);

adc_code.by.te3 = i2c_read();

adc_code.by.te2 = i2c_read();

adc_code.by.te1 = i2c_read();

adc_code.by.te0 = 0;

i2c_stop();

return adc_code.bits32;

} // End of read_LTC2481()

/*** initialize() **************************************************************

Basic hardware initialization of controller and LCD, send Hello message to LCD

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

void initialize(void)

{

// General initialization stuff.

setup_adc_ports(NO_ANALOGS);

setup_adc(ADC_OFF);

setup_counters(RTCC_INTERNAL,RTCC_DIV_1);

setup_timer_1(T1_DISABLED);

setup_timer_2(T2_DISABLED,0,1);

// This is the important part - configuring the SPI port

setup_spi(SPI_MASTER|SPI_L_TO_H|SPI_CLK_DIV_16|SPI_SS_DISABLED); // fast SPI clock

CKP = 0; // Set up clock edges - clock idles low, data changes on

CKE = 1; // falling edges, valid on rising edges.

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