DAC7571

Hi Supporter,

Please help me to resolve this problem,

Thanks,

Hi User

Can you provide details on the commands you send to the DAC7571? An O-Scope shot of the command(s) would be useful as well if you can capture that for us.

Hello Hendrick,

Thanks for your support, This is my function, it is send from dspic microcontroller, A0 is connected with GND.

....

unsigned char MSB=0;
unsigned char LSB=0;

.....

void LED_Current(unsigned int curr)
{
    MSB=curr>>8;
    LSB=curr;
    Soft_I2C_Start(); // start signal
    Soft_I2C_Write(0x98); // Address ADC
    Soft_I2C_Write(MSB); //00 PD1 PD0 D11...D8
    Soft_I2C_Write(LSB); //D7...D0 // 01000000
    Soft_I2C_Stop();
}

i tried with all mode of PD0 and PD1, the result is same,

i'm out of office, i will send the O-Scope of command in tomorrow,

Hope to receive your mail,

Thanks & best regards,

Hello Hendrick,

I sent the value by function LED_Current(100);

the result alway is bigger than 0.6V,

Thanks & best regards,

Thank you Tom!

Hello user,

Tom was helping my team during the holiday break. I will take over from here.

• Can you share a copy of the schematic with us? If you would rather share this privately is it okay to contact you at your E2E registered email?
• What is the size pull-up resistors are you using?

When you mention always bigger than 0.6 V, does that mean that you are able to increase the output of the DAC as you want, just never lower than 0.6 V?