[原创]OV528应用电路

分析了买的几个成品串口摄像头后，根据自己的理解，做板验证通过。

这个原理图就是我目前正在使用的，是调通了的OV528应用电路。
OV528部分，电路里没有画各个电源的滤波/去藕电容，大家自己加上就可以了。
 

摄像头部分就相当简单了，OV7640部分的原理图如下：

因为我是分板做的，所以插头引脚的线路名称稍有差别，不过不影响使用。
还有一个最最重要的，OV528上的EEPROM（24LC64）里的代码。
HEX文件格式，用一个记事本把下面的内容粘贴过去然后存成扩展名是hex的文件就可以了。
需要用编程器先写入EEPROM，然后再焊到电路板上。

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:201DE000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF03
:201E0000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE2
:201E2000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC2
:201E4000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA2
:201E6000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF82
:201E8000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF62
:201EA000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF42
:201EC000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF22
:201EE000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF02
:201F0000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE1
:201F2000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC1
:201F4000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA1
:201F6000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF81
:201F8000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF61
:201FA000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF41
:201FC000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF21
:201FE000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF01
:00000001FF

如果电路正确，上电后14.7456Mhz的晶振会有输出，然后很快就会停止。这说明EEPROM中的代码开始工作了，这部分代码会让OV528在空闲时自动进入休眠状态，所以晶振才会不再起振。由于这个EEPROM的代码里包含一个自动波特率识别的功能，所以用示波器量芯片的UCLK引脚会发现输出的波形频率会发生变化。
如果OV528没有正确识别到EEPROM，通过示波器可以看到C_SIO_C_IN2上一直有波形。那是OV528再反复尝试读取EEPROM。一般上电复位出问题的时候会这样。这时14.7456Mhz的主晶振一直有输出，不会停下来。UCLK也是如此，输出波形频率不会改变。
至于OV7640，在上电时其实OV528是没有去访问它的，只有在用到和摄像头相关的功能，比如设置图像大小的时候，才会去访问。
接在P2[0]口上的指示灯，只要芯片复位信号撤掉就会一直亮。不管有没有成功执行到EEPROM里的代码。

这个OV528价格不贵，性能还不错，可以说性价比还是蛮高的。
有了这个应用电路后，就可以根据自己的需要做出串口摄像头板了，不需要再买别人的了。
其实目前市面上的串口摄像头基本都是大家互相抄来的，我在06年买的一个和08年买的2家不同公司的
串口摄像头，EEPROM中的代码完全一致。

正所谓“天下文章一大抄，看你会抄不会抄”。