设计基于MAX1240,MAX5353的ADDC模块STC8G1KSOP8

其他 2020-08-04 10:12:18 阅读次数: 0

作者:卓晴博士，清华大学自动化系
更新时间：2020-07-28 Tuesday

 
通过设计基于DA，AD，12-bit的模拟输入输出单片机加电路可以构成更加灵活的机理测量模块。手边有两个别人剩余的器件，基于STC8G1K(SOP8)来设计对应的电路模块。

01设计ADDA模块

1.电路设计

(1) 元器件

(2) 原理图1

下面接口的功能定义：

PIN1 PIN2 PIN3 PIN4 PIN5
+5V GND AIN AGND AOUT
  • 工作电压测试：
+5V GND 3.3V 2.5V AGND AIN AOUT
5.03 -0.00 3.31 2.42 0.00 0.24 0.00

将MAX6192的VCC增加到+5V，参考电压Vref=2.4746V。

由于MAX5353的工作电压为3.3V，所以它的输出最大为3.3V。修改RA1= 2.5k，在Vref=2.5V参考电压下，MAX5353的最大输出为3.125V。

(3) 单片机软件2

  • OSC：35M, UART1:460800bps

▲ 设置DAC与ADC读数

▲ 设置DAC与ADC读数

(4) 软件串口命令

else IFARG0("max5353") {
    sscanf(SDA(1), "%d", &nNumber);
    MAX5353Write(nNumber);
} else IFARG0("max5353x") {
    sscanf(SDA(1), "%x", &nNumber);
    MAX5353Write(nNumber);
} else IFARG0("max1240") {
    printf("%d ", MAX1240Read());
    
} else IFARG0("max1240b") {
    nNumber = MAX1240Read();
    SendChar((unsigned char)(nNumber >> 8));
    SendChar(nNumber);
    
} else IFARG0("max5353max1240") {

    for(nNumber = 0; nNumber < 0xfff; nNumber += 0x10) {
        MAX5353Write(nNumber);
        WaitTime(1);
        printf("%d ", MAX1240Read());
    }
    printf("\r\n");
} else IFARG0("maxswp") {
    sscanf(SDA(1), "%d", &nStart);
    sscanf(SDA(2), "%d", &nNumber);
    sscanf(SDA(3), "%d", &nInc);
    
    for(; nStart < nNumber ; nStart += nInc) {
        MAX5353Write(nStart);
        WaitTime(1);
        printf("%d ", MAX1240Read());
    }
    printf("\r\n");
} else IFARG0("maxswpx") {
    sscanf(SDA(1), "%x", &nStart);
    sscanf(SDA(2), "%x", &nNumber);
    sscanf(SDA(3), "%x", &nInc);
    
    for(; nStart < nNumber ; nStart += nInc) {
        MAX5353Write(nStart);
        WaitTime(1);
        printf("%d ", MAX1240Read());
    }
    printf("\r\n");
} else IFARG0("maxsample") {
    sscanf(SDA(1), "%d", &nNumber);
    sscanf(SDA(2), "%d", &nStart);
    for(nInc = 0; nInc < nNumber; nInc ++) {
        printf("%d ", MAX1240Read());
        WaitTime(nStart);
    }
    
}

02校正ADDA

1.校正DAC

▲ ADC 设置与输出（黄色）以及MAX8608跟随输出

▲ ADC 设置与输出（黄色）以及MAX8608跟随输出 

set=[0.00,40.00,80.00,120.00,160.00,200.00,240.00,280.00,320.00,360.00,400.00,440.00,480.00,520.00,560.00,600.00,640.00,680.00,720.00,760.00,800.00,840.00,880.00,920.00,960.00,1000.00,1040.00,1080.00,1120.00,1160.00,1200.00,1240.00,1280.00,1320.00,1360.00,1400.00,1440.00,1480.00,1520.00,1560.00,1600.00,1640.00,1680.00,1720.00,1760.00,1800.00,1840.00,1880.00,1920.00,1960.00,2000.00,2040.00,2080.00,2120.00,2160.00,2200.00,2240.00,2280.00,2320.00,2360.00,2400.00,2440.00,2480.00,2520.00,2560.00,2600.00,2640.00,2680.00,2720.00,2760.00,2800.00,2840.00,2880.00,2920.00,2960.00,3000.00,3040.00,3080.00,3120.00,3160.00,3200.00,3240.00,3280.00,3320.00,3360.00,3400.00,3440.00,3480.00,3520.00,3560.00,3600.00,3640.00,3680.00,3720.00,3760.00,3800.00,3840.00,3880.00,3920.00,3960.00]

volt=[0.01,0.02,0.05,0.08,0.11,0.14,0.17,0.20,0.23,0.26,0.29,0.32,0.36,0.39,0.42,0.45,0.48,0.51,0.54,0.57,0.60,0.63,0.66,0.69,0.72,0.75,0.78,0.81,0.84,0.87,0.90,0.93,0.96,1.00,1.03,1.06,1.09,1.12,1.15,1.18,1.21,1.24,1.27,1.30,1.33,1.36,1.39,1.42,1.45,1.48,1.51,1.54,1.57,1.60,1.64,1.67,1.70,1.73,1.76,1.79,1.82,1.85,1.88,1.91,1.94,1.97,2.00,2.03,2.06,2.09,2.12,2.15,2.18,2.21,2.25,2.28,2.31,2.34,2.37,2.40,2.43,2.46,2.49,2.52,2.55,2.58,2.61,2.64,2.67,2.70,2.73,2.76,2.79,2.82,2.85,2.88,2.92,2.95,2.98,3.01]

adc=[-0.01,0.02,0.05,0.08,0.11,0.14,0.17,0.20,0.23,0.26,0.29,0.32,0.35,0.38,0.42,0.45,0.48,0.51,0.54,0.57,0.60,0.63,0.66,0.69,0.72,0.75,0.78,0.81,0.84,0.87,0.90,0.93,0.96,0.99,1.02,1.05,1.09,1.12,1.15,1.18,1.21,1.24,1.27,1.30,1.33,1.36,1.39,1.42,1.45,1.48,1.51,1.54,1.57,1.60,1.63,1.66,1.69,1.73,1.76,1.79,1.82,1.85,1.88,1.91,1.94,1.97,2.00,2.03,2.06,2.09,2.12,2.15,2.18,2.21,2.24,2.27,2.30,2.33,2.37,2.40,2.43,2.46,2.49,2.52,2.55,2.58,2.61,2.64,2.67,2.70,2.73,2.76,2.79,2.82,2.85,2.88,2.91,2.94,2.97,3.00]

对上述DAC的设置x与输出之间的关系通过下面线性关系拟合：
A D C = a × x + b ADC = a \times x + b

获得参数为：[ a=0.00076168 b=-0.01134206]
A D C = 0.76168 x 1000 − 0.01134 ADC = {{0.76168x} \over {1000}} - 0.01134 

#!/usr/local/bin/python
# -*- coding: gbk -*-
#============================================================
# DRAW1.PY                     -- by Dr. ZhuoQing 2020-07-28
#
# Note:
#============================================================
from headm import *
from scipy.optimize         import curve_fit
def func1(x, a, b):
    return x * a + b
set, volt, adc = tspload('meas', 'set', 'volt', 'adc')
#------------------------------------------------------------
param = (3/4000, 0)
param, conv = curve_fit(func1, set, adc, p0=param)
printf(param)
#------------------------------------------------------------
#        END OF FILE : DRAW1.PY
#============================================================

2.校正ADC

输入电压与转换值：
▲ ADC输入电压与转换值

▲ ADC输入电压与转换值

最后电压为： 1.5105V，转换值为2503
那么，转换值与电压之间的比例为：0.6035/1000。

这个数值理论值为： 2.5 4095 = 0.61035 × 1 0 − 3 {{2.5} \over {4095}} = 0.61035 \times 10^{ - 3}

▲ 红色LED的电流与电流之间的关系

▲ 红色LED的电流与电流之间的关系

▲ 绿色色LED的电流与电流之间的关系

▲ 绿色色LED的电流与电流之间的关系

▲ 蓝色色LED的电流与电流之间的关系

▲ 蓝色色LED的电流与电流之间的关系

▲ 白色LED电流与电压之间的关系

▲ 白色LED电流与电压之间的关系 

#!/usr/local/bin/python
# -*- coding: gbk -*-
#============================================================
# TEST1.PY                     -- by Dr. ZhuoQing 2020-07-28
#
# Note:
#============================================================

from headm                  import *
from tsmodule.tsvisa        import *
from tsmodule.tsstm32       import *

stm32cmd("CLEAR")
stm32cmd("max5353 0")
time.sleep(1)

stm32cmd('maxswp 0 4000 2 1')
time.sleep(3)
val = stm32memo(1)

set = list(range(0, 4000, 2))

printf(set)

volt = [0.76168*s/1000-0.01134 for s in set]
voltled = [0.6035*s/1000 for s in val]
curr = [(v1-v2) for v1,v2 in zip(volt, voltled)]

plt.plot(voltled, curr)
plt.ylabel("Current(mA)")
plt.xlabel("Voltage(V)")
plt.grid(True)
plt.tight_layout()
plt.show()

#------------------------------------------------------------
#        END OF FILE : TEST1.PY
#============================================================

03软件

/*
**==============================================================================
** MAX5353.H:            -- by Dr. ZhuoQing, 2020-07-28
**
**  Description:
**
**==============================================================================
*/
#ifndef __MAX5353__
#define __MAX5353__
//------------------------------------------------------------------------------
#ifdef MAX5353_GLOBALS
   #define MAX5353_EXT
#else
   #define MAX5353_EXT extern
#endif // MAX5353_GLOBALS
//------------------------------------------------------------------------------
//==============================================================================
#define MAX5353_CS          5,5
#define MAX5353_CLK         3,3
#define MAX5353_DIO         3,2
//------------------------------------------------------------------------------

void MAX5353Init(void);

void MAX5353Write(unsigned int nNumber);
void MAX5353Delay(unsigned char ucDelay);
void MAX5353Clock(unsigned char ucClock);

//==============================================================================
//             END OF THE FILE : MAX5353.H
//------------------------------------------------------------------------------
#endif // __MAX5353__

/*
**==============================================================================
** MAX5353.C:             -- by Dr. ZhuoQing, 2020-07-28
**
**==============================================================================
*/

//------------------------------------------------------------------------------
#define MAX5353_GLOBALS        1              // Define the global variables
#include "MAX5353.H"
#include "C51BASIC.H"
#include "STC8G.H"
#include "INTRINS.H"

//------------------------------------------------------------------------------

void MAX5353Init(void) {
    ON(MAX5353_DIO);
    OFF(MAX5353_CLK);
    ON(MAX5353_CS);
    
    PM_PP(MAX5353_CS);
    PM_BIDIR(MAX5353_DIO);
    PM_PP(MAX5353_CLK);
    
}

void MAX5353Delay(unsigned char ucDelay) {
    unsigned char i;
    for(i = 0; i < ucDelay; i ++) {
        _nop_();
        _nop_();
        _nop_();
        _nop_();
        _nop_();
    }

}

void MAX5353Clock(unsigned char ucClock) {
    unsigned char i;
    for(i = 0; i < ucClock; i ++) {
        ON(MAX5353_CLK);
        MAX5353Delay(10);
        OFF(MAX5353_CLK);
        MAX5353Delay(10);
    }
}

void MAX5353Write(unsigned int nNumber) {
    unsigned int nMask;
    unsigned char i;
    
    OFF(MAX5353_CLK);
    OFF(MAX5353_CS);
    OFF(MAX5353_DIO);
    
    MAX5353Clock(3);
    
    nMask = 0x800;
    for(i = 0; i < 12; i ++) {
        if(nNumber & nMask)
            ON(MAX5353_DIO);
        else OFF(MAX5353_DIO);
        
        nMask >>= 1;
        MAX5353Clock(1);
    }
    
    OFF(MAX5353_DIO);
    MAX5353Clock(1);
    ON(MAX5353_CS);
    
}

//==============================================================================
//                END OF THE FILE : MAX5353.C
//------------------------------------------------------------------------------

/*
**==============================================================================
** MAX1240.H:            -- by Dr. ZhuoQing, 2020-07-28
**
**  Description:
**
**==============================================================================
*/
#ifndef __MAX1240__
#define __MAX1240__
//------------------------------------------------------------------------------
#ifdef MAX1240_GLOBALS
   #define MAX1240_EXT
#else
   #define MAX1240_EXT extern
#endif // MAX1240_GLOBALS
//------------------------------------------------------------------------------
//==============================================================================
#define MAX1240_CS          5, 4
#define MAX1240_CLK         3, 3
#define MAX1240_DIO         3, 2
//------------------------------------------------------------------------------
void MAX1240Init(void);

void MAX1240Delay(unsigned char ucDelay);
unsigned int MAX1240Read(void);

//==============================================================================
//             END OF THE FILE : MAX1240.H
//------------------------------------------------------------------------------
#endif // __MAX1240__

/*
**==============================================================================
** MAX1240.C:             -- by Dr. ZhuoQing, 2020-07-28
**
**==============================================================================
*/

//------------------------------------------------------------------------------
#define MAX1240_GLOBALS        1              // Define the global variables
#include "intrins.h"
#include "MAX1240.H"
#include "C51BASIC.H"
#include "STC8G.H"

//------------------------------------------------------------------------------

void MAX1240Init(void) {
    ON(MAX1240_CS);
    OFF(MAX1240_CLK);
    ON(MAX1240_DIO);

    PM_PP(MAX1240_CS);
    PM_BIDIR(MAX1240_DIO);
    PM_PP(MAX1240_CLK);    
}

void MAX1240Delay(unsigned char ucDelay) {
    unsigned char j;
    for(j = 0; j < ucDelay; j ++) {
        _nop_();
        _nop_();
        _nop_();
        _nop_();
        _nop_();
    }
    
}

unsigned int MAX1240Read(void) {
    unsigned int nNumber, i;
    
    PM_BIDIR(MAX1240_DIO);
    ON(MAX1240_DIO);

    OFF(MAX1240_CLK);
    OFF(MAX1240_CS);
    for(i = 0; i < 100; i ++) {
        MAX1240Delay(100);
        if(VAL(MAX1240_DIO)) break;
    }
    
    if(VAL(MAX1240_DIO) == 0) return 0x0;
    
    nNumber = 0;
    for(i = 0; i < 12; i ++) {
        ON(MAX1240_CLK);
        MAX1240Delay(10);
        OFF(MAX1240_CLK);
        MAX1240Delay(10);
        nNumber <<= 1;
        if(VAL(MAX1240_DIO)) nNumber |= 0x1;
    }
    
    for(i = 0; i < 4; i ++) {
        ON(MAX1240_CLK);
        MAX1240Delay(10);
        OFF(MAX1240_CLK);
        MAX1240Delay(10);
        
    }
    
    ON(MAX1240_CS);
    return nNumber;
}

//==============================================================================
//                END OF THE FILE : MAX1240.C
//------------------------------------------------------------------------------

※ 结论

  • DAC比率：

A D C = 0.76168 x 1000 − 0.01134 ADC = {{0.76168x} \over {1000}} - 0.01134

  • ADC比率： 0.6035/1000。
    数值理论值为： 2.5 4095 = 0.61035 × 1 0 − 3 {{2.5} \over {4095}} = 0.61035 \times 10^{ - 3}

  1. AD设计工程文件:AD\Tools\2020\ADDASTC8G1K08\ADDASTC8G1K08.SchDoc * ↩︎

  2. C51工程文件:C51\STC\Tools\2020\ADDAST8G1K\ADDASTC8G1k.uvproj ↩︎

猜你喜欢

转载自blog.csdn.net/zhuoqingjoking97298/article/details/107630563
max
今日推荐
TIOBE 5 月榜单：Fortran “复活”进入 Top 10
GCC 14.1 发布
面壁智能发布 Eurux-8x22B 开源大模型 —— 堪称「理科状元」
开源日报 | 谷歌扶持鸿蒙上位；开源Rabbit R1；Docker加持的安卓手机；微软的焦虑和野心；海尔电器把开放平台关了
中国码农的“35岁魔咒”
蘭雅 CorelDRAW 插件 2024.5.1 国际劳动节版，免费下载
Arc Browser for Windows 1.0 正式 GA
90后程序员开发视频搬运软件、不到一年获利超 700 万，结局很刑！
周排行
Java自定义时间格式
同步整形电路
在开发中最最最常用的字符串的属性大集合
Linux 查看端口占用并杀掉
Java基础四：ArrayList
多线程之死锁就是这么简单
mysql 基础命令集
awk 命令详解
Centos6.3编译安装nginx+php步骤
OCR （Optical Character Recognition，光学字符识别）
每日归档
更多
2024-05-08(42)
2024-05-07(14)
2024-05-06(40)
2024-05-05(0)
2024-05-04(7)
2024-05-03(19)
2024-05-02(0)
2024-05-01(4)
2024-04-30(1)
2024-04-29(40)

代码天地 © 2018 codetd.com

境外服务器   最新电视剧2022