TLC5620问题
我在VrefA~D 上给上一个5V或9V电压，程序中将第三位置为1,结果，传入0x1ff,结果输出值总是为4.2V，请教是怎么回事，代码如下
void Wait(unsigned char x)
{
unsigned char i;
for(i=0;i<x;i++);
}
void dacck(void)
{
DAC_CLK=1;
Wait(2);
DAC_CLK=0;
Wait(2);
}
void TLC5620_WriteDac(unsigned int x)
{
unsigned char i;
unsigned int ch=x << 5;
DAC_LDAC = 1;
DAC_LOAD=1;
for (i=0; i<11; i++)
{
ch=ch<<1;
DAC_DATA=CY;
dacck();
}
DAC_LOAD=0;
Wait(2);
DAC_LOAD=1;
Wait(2);
DAC_LDAC = 0;
Wait(2);
DAC_LDAC = 1;
}
void main()
{
unsigned char a;
P26 = 0;
//P25 = 0;
TLC5620_WriteDac(0x01ff);
while(1)
{
}
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