LTC2435-1IGN datasheet(36/40 Pages) LINER

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LTC2435/LTC2435-1

24351fa

APPLICATIO S I FOR ATIO

// Basic data collection program for the LTC2435 using the

// PIC16F73 microcontroller. Collects data as fast as possible

// and sends it out the serial port at 57600 baud as six

// hexadecimal characters, followed by a carriage return.

// This can be captured with a terminal program and analyzed

// with a spreadsheet using the HEX2DEC function (in Excel.)

// Written for the CCS compiler, version 3.049.

////////////////////////////////////////////////////////////////////

#include <16F73.h>

#byte SSPCON = 0x14

// Synchronous serial port control

#byte SSPSTAT = 0x94

// registers.

#bit CKE = SSPSTAT.6

#bit CKP = SSPCON.4

#bit SSPEN = SSPCON.5

#fuses HS,NOWDT,PUT

#use delay(clock=10000000)

// For baud rate calculation.

#use rs232(baud=57600,parity=N,xmit=PIN_C6,rcv=PIN_C7)

// Serial data is sent on pin C6.

#define CS_ PIN_C2

// Chip select connected to pin C2

#define CLOCK PIN_C

// Clock connected to pin C3

#define SDO PIN_C4

// SDO on the LTC2435 connected to pin C4

// (this is SDI on the PIC;

// Master In, Slave Out (MISO) is less ambiguous)

void main() {

// Basic configuration, no bearing on operation of LTC2435

setup_adc_ports(NO_ANALOGS);

setup_adc(ADC_CLOCK_DIV_2);

setup_counters(RTCC_INTERNAL,RTCC_DIV_2);

setup_timer_1(T1_DISABLED);

setup_timer_2(T2_DISABLED,0,1);

setup_ccp1(CCP_OFF);

setup_ccp2(CCP_OFF);

// LTC2435 is connected to the processor’s hardware SPI port.

// This sets the port such that data is shifted on clock falling edges and

// valid on rising edges. For a 10 MHz master clock, the SPI clock frequency

// wil be 2.5 MHz.

setup_spi(SPI_MASTER|SPI_L_TO_H|SPI_CLK_DIV_4|SPI_SS_DISABLED);

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

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

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