关于TI DAC芯片 DAC101C081 地址选择_dac芯片地址的设定-优快云博客

本文链接：https://blog.youkuaiyun.com/penglijiang/article/details/53259388

本文档详细记录了DAC101C081芯片与MSP430微控制器连接过程中遇到的问题及解决方案。文中明确了DAC101C081的正确地址配置方法，并提供了具体的I2C通信代码示例。

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这个芯片资料非常简单，单纯看pdf文档很难选择出正确的地址。

在官方技术讨论区正好看到有这个地址的询问，特此记录下。

Question for connecting DAC101C081 with MSP430F5172

I recently met a problem. I tried to connect the DAC101C081 (6 pins, I2C) as slave mode with MSP430 (master mode).
I connected ADR0 of DAC to GND and Va to 5V. However, when I tried to transmit the data from MSP to DAC,
even if I set the slave address as 0x0Dh as datasheet, I could not receive the ACK from DAC. Could anyone provide the suggestion?

Hello,

The address when communicating with the DAC101C081 the address byte consists of 7 bits for the address and 1 bit for read or write.
With ADR0 grounded the address is 000 1101.
To write to the part you need to add a 0 to the end and so you send 0001 1010 (0x1A) for the address byte. See Figure 26 in the datasheet.
To read from the part you need to add a 1 to the end and so you send 0001 1011 (0x1B) for the address byte. See Figure 27 in the datasheet.

i2c驱动我也分享下，参考24c04类似代码

                   
//#define ADDR_IIC        0x0d
#define ADDR_IIC        0x0c
/*
enum ENUM_TWI_REPLY
{
TWI_NACK=0
,TWI_ACK=1
};
*/
enum ENUM_TWI_BUS_STATE
{
TWI_READY=0
,TWI_BUS_BUSY=1
,TWI_BUS_ERROR=2
};


static void delay_nop(uint8_t time)
{
    uint8_t  i;
    
    for(i=0; i<time; i++)
    {
        __nop(); __nop();
    }
}

static void  TWI_delay(void)
{
   uint8_t i=5; //i=10延时1.5us//这里可以优化速度 ，经测试最低到5还能写入
   while(i--); 
}

void DAC081_Set(void)
{
     
}

uint8_t TWI_Start(void)
{
		 SDAH;
		 SCLH;
		 TWI_delay();
		 if(!SDAread)return TWI_BUS_BUSY; //SDA线为低电平则总线忙,退出
		 SDAL;
		 TWI_delay();
		 if(SDAread) return TWI_BUS_ERROR; //SDA线为高电平则总线出错,退出
		 SCLL;
		 TWI_delay();

		 return TWI_READY;
}


void TWI_Stop(void)
{
		 SDAL;
		 SCLL;
		 TWI_delay();
		 SCLH;
		 TWI_delay();
		 SDAH;
		 TWI_delay();
}

void TWI_Ack(void)
{ 
		 SCLL;
		 TWI_delay();
		 SDAL;
		 TWI_delay();
		 SCLH;
		 TWI_delay();
		 SCLL;
		 TWI_delay();
}

void TWI_NoAck(void)
{ 
		 SCLL;
		 TWI_delay();
		 SDAH;
		 TWI_delay();
		 SCLH;
		 TWI_delay();
		 SCLL;
		 TWI_delay();
}

uint8_t TWI_WaitAck(void)   //返回为:=1有ACK,=0无ACK
{
		 SCLL;
		 TWI_delay();
		 //SDAH;   
		 GPIO_PinModeSet(gpioPortE, 13, gpioModeInput, 0); 
		 //TWI_delay();
		 SCLH;
		 TWI_delay();
		 if(SDAread)
		 {
							SCLL;
							return 0;
		 }
		 SCLL;
		 
		 GPIO_PinModeSet(gpioPortE, 13, gpioModePushPull, 1); 
		 
		 return 1;
}

void TWI_SendByte(uint8_t SendByte) //数据从高位到低位//
{
     uint8_t  i;
	 for(i=0; i<8; i++)
	{
		     SCLL;
        TWI_delay();
		
        if(SendByte&0x80)
          SDAH;  
        else 
        SDAL;   
				
        SendByte<<=1;
				
        //TWI_delay();
        SCLH;
        TWI_delay();
	}
    SCLL;
}


uint8_t DAC081_WriteByte(uint8_t upper)
{  
	
		uint8_t i;
		TWI_Start();

		TWI_SendByte( (ADDR_IIC<<1) & 0xFE);//写器件地址  写入：地址最低位是0，读取：地址最低位是1
    //TWI_SendByte( 0x1A);
	
		if(!TWI_WaitAck())
		{
		TWI_Stop(); 
		return 0;
		}
 
    TWI_SendByte((upper>>4)&0x0F);   
		
    TWI_WaitAck(); 
		
    TWI_SendByte(upper<<4);      
		
    TWI_WaitAck();   
	
    TWI_Stop(); 

    return 0;
}