LTC2485 LINER [Linear Technology], LTC2485 Datasheet - Page 34

• Manufacturer Part Number: LTC2485
• Description: 24-Bit ?? ADC with Easy Drive Input Current Cancellation and I2C Interface
• Manufacturer: LINER [Linear Technology]

APPLICATIO S I FOR ATIO
LTC2485
/*
LTC248X.h
Processor setup and
Lots of useful defines for configuring the LTC2481, LTC2483, and LTC2485.
*/
#include <16F73.h>
#use delay(clock=6000000)
//#fuses NOWDT,HS, PUT, NOPROTECT, NOBROWNOUT
#rom 0x2007={0x3F3A} // Equivalent and more reliable fuse config.
#use I2C(master, sda=PIN_C5, scl=PIN_C3, SLOW)// Set up i2c port
#include “PCM73A.h”
#include “lcd.c”
#define READ
#define WRITE
#define LTC248XADDR 0b01001000
// Useful defines for the LTC2481 and LTC2485 - OR them together to make the
// 8 bit config word.
// These do NOT apply to the LTC2483.
// Select gain - 1 to 256 (also depends on speed setting)
// Does NOT apply to LTC2485.
#define GAIN1
#define GAIN2
#define GAIN3
#define GAIN4
#define GAIN5
#define GAIN6
#define GAIN7
#define GAIN8
// Select ADC source - differential input or PTAT circuit
#define VIN
#define PTAT
// Select rejection frequency - 50, 55, or 60Hz
#define R50
#define R55
#define R60
// Select speed mode
#define SLOW
#define FAST
34
U
0b00000000
0b00001000
0b00000010
0b00000000
0b00000100
0b00000000
0b00100000
0b01000000
0b01100000
0b10000000
0b10100000
0b11000000
0b11100000
0b00000000 // slow output rate with autozero
0b00000001 // fast output rate with no autozero
0x01
0x00
U
W
// G = 1
// G = 4
// G = 8
// G = 16
// G = 32
// G = 64
// G = 128 (SPD = 0), G = 64
// G = 256 (SPD = 0), G = 128 (SPD = 1)
// bitwise OR with address for read or write
// The one and only LTC248X in this circuit,
// with both address lines floating.
U
(SPD = 0), G = 1
(SPD = 0), G = 2
(SPD = 0), G = 4
(SPD = 0), G = 8
(SPD = 0), G = 16
(SPD = 0), G = 32
// Various defines
// LCD driver functions
// Device
// 6MHz clock
// Configuration fuses
(SPD = 1)
(SPD = 1)
(SPD = 1)
(SPD = 1)
(SPD = 1)
(SPD = 1)
(SPD = 1)
2485fa