參數(shù)資料
型號(hào)： AD7715
廠商： Analog Devices, Inc.
英文描述： 3 V/5 V, 450 mA 16-Bit, Sigma-Delta ADC(16位∑△A/D轉(zhuǎn)換器)
中文描述： 3伏/ 5伏，450毫安16位Σ-Δ模數(shù)轉(zhuǎn)換器（16位Σ△的A / D轉(zhuǎn)換器）
文件頁(yè)數(shù)： 26/31頁(yè)
文件大小： 254K
代理商： AD7715
REV. B
AD7715
–26–
Table XVI. C Code for Interfacing AD7715 to 68HC11
/* This program has read and write routines for the 68HC11 to interface to the AD7715 and the sample
program sets the various registers and then reads 1000 samples from the part. */
#include <math.h>
#include <io6811.h>
#define NUM_SAMPLES 1000 /* change the number of data samples */
#define MAX_REG_LENGTH 2 /* this says that the max length of a register is 2 bytes */
Writetoreg (int);
Read (int,char);
char *datapointer = store;
char store[NUM_SAMPLES*MAX_REG_LENGTH + 30];
void main()
{
/* the only pin that is programmed here from the 68HC11 is the /CS and this is why the PC2 bit
of PORTC is made as an output */
char a;
DDRC = 0x04; /* PC2 is an output the rest of the port bits are inputs */
PORTC | = 0x04; /* make the /CS line high */
Writetoreg(0x10); /* set the gain to 1, standby off and set the next operation as write to the setup
register */
Writetoreg(0x68); /* set bipolar mode, buffer off, no filter sync, confirm clock as 2.4576MHz, set
output rate to 60Hz and do a self calibration */
while(PORTC & 0x10); /* wait for /DRDY to go low */
for(a=0;a<NUM_SAMPLES;a++);
{
Writetoreg(0x38); /*set the next operation for 16 bit read from the data register */
Read(NUM_SAMPLES,2);
}
}
Writetoreg(int byteword);
{
int q;
SPCR = 0x3f;
SPCR = 0X7f; /* this sets the WiredOR mode(DWOM=1), Master mode(MSTR=1), SCK idles high(CPOL=1), /SS
can be low always (CPHA=1), lowest clock speed(slowest speed which is master clock /32 */
DDRD = 0x18; /* SCK, MOSI outputs */
q = SPSR;
q = SPDR; /* the read of the staus register and of the data register is needed to clear the interrupt
which tells the user that the data transfer is complete */
PORTC &= 0xfb; /* /CS is low */
SPDR = byteword; /* put the byte into data register */
while(!(SPSR & 0x80)); /* wait for /DRDY to go low */
PORTC |= 0x4; /* /CS high */
}
Read(int amount, int reglength)
{
int q;
SPCR = 0x3f;
SPCR = 0x7f; /* clear the interrupt */
DDRD = 0x10; /* MOSI output, MISO input, SCK output */
while(PORTC & 0x10); /* wait for /DRDY to go low */
PORTC & 0xfb ; /* /CS is low */
for(b=0;b<reglength;b++)
{
SPDR = 0;
while(!(SPSR & 0x80)); /* wait until port ready before reading */
*datapointer++=SPDR; /* read SPDR into store array via datapointer */
}
PORTC|=4; /* /CS is high */
}
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD7715_10 制造商:AD 制造商全稱:Analog Devices 功能描述:3 V/5 V, 450 ??A 16-Bit, Sigma-Delta ADC
AD7715-5EB 制造商:Analog Devices 功能描述:
AD7715ACHIPS-3 制造商:AD 制造商全稱:Analog Devices 功能描述:3 V/5 V, 450 uA 16-Bit, Sigma-Delta ADC
AD7715ACHIPS-5 制造商:AD 制造商全稱:Analog Devices 功能描述:3 V/5 V, 450 uA 16-Bit, Sigma-Delta ADC
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