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參數資料
型號: AD7707EB
廠商: Analog Devices, Inc.
英文描述: 3 V/5 V 610 V Input Range 1 mW 3-Channel 16-Bit Sigma-Delta ADC(316.51 k)
中文描述: 3伏/ 5伏610 V輸入范圍1毫瓦3通道16位Σ-Δ模數轉換器(316.51十一)
文件頁數: 32/40頁
文件大小: 316K
代理商: AD7707EB
REV. A
AD7707
–32–
Table XVIII. C Code for Interfacing AD7707 to 68HC11
/* This program has read and write routines for the 68HC11 to interface to the AD7707 and the sample program sets the various
registers and then reads 1000 samples from one channel. */
#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 (0x20); /* Active Channel is AIN1/LOCOM, next operation as write to the clock register */
Writetoreg (0x18); /* master clock enabled, 4.9512MHz Clock, set output rate to 50Hz*/
Writetoreg (0x10); /* Active Channel is AIN1/LOCOM, next operation as write to the setup register */
Writetoreg (0x40); /* gain = 1, bipolar mode, buffer off, clear FSYNC and perform a Self Calibration*/
while (PORTC and 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_SAMPES,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 interupt */
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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AD7708BR-REEL7 功能描述:IC ADC 16BIT R-R 8/10CH 28-SOIC RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率(每秒):45k 數據接口:串行 轉換器數目:2 功率耗散(最大):315mW 電壓電源:模擬和數字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC(0.295",7.50mm 寬) 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數目和類型:2 個單端,單極
AD7708BRU 功能描述:IC ADC 16BIT R-R 8/10CH 28-TSSOP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率(每秒):45k 數據接口:串行 轉換器數目:2 功率耗散(最大):315mW 電壓電源:模擬和數字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC(0.295",7.50mm 寬) 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數目和類型:2 個單端,單極